version 2.6.90

* NEWS: Record release date.
build: fix syntax-check error.
2026-08-09 10:45:15 +00:00 · 2012-12-07 11:37:14 +01:00 · 2012-12-07 11:34:51 +01:00 · 2012-12-07 12:13:38 +01:00 · 2012-12-07 12:02:00 +01:00 · 2012-12-07 12:02:00 +01:00
107 changed files with 7638 additions and 4292 deletions
@@ -11,6 +11,7 @@
 /INSTALL
 /Makefile
 /Makefile.in
+/README-release
 /_*
 /a.exe
 /a.out
@@ -31,4 +32,3 @@
 /patches
 /releases
 /stamp-h*
-/README-release
@@ -1 +1 @@
-2.5
+2.6.5
@@ -66,13 +66,15 @@ update-package-copyright-year:
 gen_start_date = 2012-01-16
 .PHONY: gen-ChangeLog
 gen-ChangeLog:
-	$(AM_V_GEN)if test -d $(srcdir)/.git; then		\
-	  $(top_srcdir)/build-aux/gitlog-to-changelog		\
-	    --strip-tab						\
-	    --strip-cherry-picked				\
-	    --no-cluster					\
-	    --amend=$(srcdir)/build-aux/git-log-fix		\
-	    --since=$(gen_start_date) > $(distdir)/cl-t;	\
-	  rm -f $(distdir)/ChangeLog;				\
-	  mv $(distdir)/cl-t $(distdir)/ChangeLog;		\
+	$(AM_V_GEN)if test -d $(srcdir)/.git; then	\
+	  cl=$(distdir)/ChangeLog &&			\
+	  rm -f $$cl.tmp &&				\
+	  $(top_srcdir)/build-aux/gitlog-to-changelog	\
+	    --strip-tab					\
+	    --strip-cherry-pick				\
+	    --no-cluster				\
+	    --amend=$(srcdir)/build-aux/git-log-fix	\
+	    --srcdir=$(srcdir)				\
+	    --since=$(gen_start_date) > $$cl.tmp &&	\
+	  mv -f $$cl.tmp $$cl;				\
 	fi
@@ -1,5 +1,362 @@
 GNU Bison NEWS

+* Noteworthy changes in release 2.6.90 (2012-12-07) [beta]
+
+** Bug fixes
+
+  Warnings about uninitialized yylloc in yyparse have been fixed.
+
+** %language is no longer an experimental feature.
+
+  The introduction of this feature, in 2.4, was four years ago. The --language
+  option and the %language directive are no longer experimental.
+
+** New format for error reports: carets
+
+  Caret errors have been added to Bison, for example (taken from the
+  documentation):
+
+    input.y:3.20-23: error: ambiguous reference: '$exp'
+     exp: exp '+' exp { $exp = $1 + $3; };
+                        ^^^^
+    input.y:3.1-3:       refers to: $exp at $$
+     exp: exp '+' exp { $exp = $1 + $3; };
+     ^^^
+    input.y:3.6-8:       refers to: $exp at $1
+     exp: exp '+' exp { $exp = $1 + $3; };
+          ^^^
+    input.y:3.14-16:     refers to: $exp at $3
+     exp: exp '+' exp { $exp = $1 + $3; };
+                  ^^^
+
+  The default behaviour for now is still not to display these unless explictly
+  asked with -fall of -fcaret. However, in a later release, it will be made the
+  default behavior (but may still be deactivated with -fno-caret).
+
+** New value for %define variable: api.pure full
+
+  The %define variable api.pure requests a pure (reentrant) parser. However,
+  for historical reasons, using it in a location-tracking Yacc parser resulted
+  in a yyerror function that did not take a location as a parameter. With this
+  new value, the user may request a better pure parser, where yyerror does take
+  a location as a parameter (in location-tracking parsers).
+
+  The use of "%define api.pure true" is deprecated in favor of this new
+  "%define api.pure full".
+
+** Changes in the format of error messages
+
+  This used to be the format of many error reports:
+
+    foo.y:5.10-24: result type clash on merge function 'merge': <t3> != <t2>
+    foo.y:4.13-27: previous declaration
+
+  It is now:
+
+    foo.y:5.10-25: result type clash on merge function 'merge': <t3> != <t2>
+    foo.y:4.13-27:     previous declaration
+
+** Exception safety (lalr1.cc)
+
+  The parse function now catches exceptions, uses the %destructors to
+  release memory (the lookahead symbol and the symbols pushed on the stack)
+  before re-throwing the exception.
+
+  This feature is somewhat experimental.  User feedback would be
+  appreciated.
+
+** New %define variable: api.location.type (glr.cc, lalr1.cc, lalr1.java)
+
+  The %define variable api.location.type defines the name of the type to use
+  for locations.  When defined, Bison no longer generates the position.hh
+  and location.hh files, nor does the parser will include them: the user is
+  then responsible to define her type.
+
+  This can be used in programs with several parsers to factor their location
+  and position files: let one of them generate them, and the others just use
+  them.
+
+  This feature was actually introduced, but not documented, in Bison 2.5,
+  under the name "location_type" (which is maintained for backward
+  compatibility).
+
+  For consistency, lalr1.java's %define variables location_type and
+  position_type are deprecated in favor of api.location.type and
+  api.position.type.
+
+** Graph improvements in DOT and XSLT
+
+  The graphical presentation of the states is more readable: their shape is
+  now rectangular, the state number is clearly displayed, and the items are
+  numbered and left-justified.
+
+  The reductions are now explicitly represented as transitions to other
+  diamond shaped nodes.
+
+  These changes are present in both --graph output and xml2dot.xsl XSLT
+  processing, with minor (documented) differences.
+
+  Two nodes were added to the documentation: Xml and Graphviz.
+
+** Documentation
+
+  The sections about shift/reduce and reduce/reduce conflicts resolution
+  have been fixed and extended.
+
+* Noteworthy changes in release 2.6.5 (2012-11-07) [stable]
+
+  We consider compiler warnings about Bison generated parsers to be bugs.
+  Rather than working around them in your own project, please consider
+  reporting them to us.
+
+** Bug fixes
+
+  Warnings about uninitialized yylval and/or yylloc for push parsers with a
+  pure interface have been fixed for GCC 4.0 up to 4.8, and Clang 2.9 to
+  3.2.
+
+  Other issues in the test suite have been addressed.
+
+  Nul characters are correctly displayed in error messages.
+
+  When possible, yylloc is correctly initialized before calling yylex.  It
+  is no longer necessary to initialize it in the %initial-action.
+
+* Noteworthy changes in release 2.6.4 (2012-10-23) [stable]
+
+  Bison 2.6.3's --version was incorrect.  This release fixes this issue.
+
+* Noteworthy changes in release 2.6.3 (2012-10-22) [stable]
+
+** Bug fixes
+
+  Bugs and portability issues in the test suite have been fixed.
+
+  Some errors in translations have been addressed, and --help now directs
+  users to the appropriate place to report them.
+
+  Stray Info files shipped by accident are removed.
+
+  Incorrect definitions of YY_, issued by yacc.c when no parser header is
+  generated, are removed.
+
+  All the generated headers are self-contained.
+
+** Header guards (yacc.c, glr.c, glr.cc)
+
+  In order to avoid collisions, the header guards are now
+  YY_<PREFIX>_<FILE>_INCLUDED, instead of merely <PREFIX>_<FILE>.
+  For instance the header generated from
+
+    %define api.prefix "calc"
+    %defines "lib/parse.h"
+
+  will use YY_CALC_LIB_PARSE_H_INCLUDED as guard.
+
+** Fix compiler warnings in the generated parser (yacc.c, glr.c)
+
+  The compilation of pure parsers (%define api.pure) can trigger GCC
+  warnings such as:
+
+    input.c: In function 'yyparse':
+    input.c:1503:12: warning: 'yylval' may be used uninitialized in this
+                              function [-Wmaybe-uninitialized]
+       *++yyvsp = yylval;
+                ^
+
+  This is now fixed; pragmas to avoid these warnings are no longer needed.
+
+  Warnings from clang ("equality comparison with extraneous parentheses" and
+  "function declared 'noreturn' should not return") have also been
+  addressed.
+
+* Noteworthy changes in release 2.6.2 (2012-08-03) [stable]
+
+** Bug fixes
+
+  Buffer overruns, complaints from Flex, and portability issues in the test
+  suite have been fixed.
+
+** Spaces in %lex- and %parse-param (lalr1.cc, glr.cc)
+
+  Trailing end-of-lines in %parse-param or %lex-param would result in
+  invalid C++.  This is fixed.
+
+** Spurious spaces and end-of-lines
+
+  The generated files no longer end (nor start) with empty lines.
+
+* Noteworthy changes in release 2.6.1 (2012-07-30) [stable]
+
+  Bison no longer executes user-specified M4 code when processing a grammar.
+
+** Future Changes
+
+  In addition to the removal of the features announced in Bison 2.6, the
+  next major release will remove the "Temporary hack for adding a semicolon
+  to the user action", as announced in the release 2.5.  Instead of:
+
+    exp: exp "+" exp { $$ = $1 + $3 };
+
+  write:
+
+    exp: exp "+" exp { $$ = $1 + $3; };
+
+** Bug fixes
+
+*** Type names are now properly escaped.
+
+*** glr.cc: set_debug_level and debug_level work as expected.
+
+*** Stray @ or $ in actions
+
+  While Bison used to warn about stray $ or @ in action rules, it did not
+  for other actions such as printers, destructors, or initial actions.  It
+  now does.
+
+** Type names in actions
+
+  For consistency with rule actions, it is now possible to qualify $$ by a
+  type-name in destructors, printers, and initial actions.  For instance:
+
+    %printer { fprintf (yyo, "(%d, %f)", $<ival>$, $<fval>$); } <*> <>;
+
+  will display two values for each typed and untyped symbol (provided
+  that YYSTYPE has both "ival" and "fval" fields).
+
+* Noteworthy changes in release 2.6 (2012-07-19) [stable]
+
+** Future Changes
+
+  The next major release of Bison will drop support for the following
+  deprecated features.  Please report disagreements to [email protected].
+
+*** K&R C parsers
+
+  Support for generating parsers in K&R C will be removed.  Parsers
+  generated for C support ISO C90, and are tested with ISO C99 and ISO C11
+  compilers.
+
+*** Features deprecated since Bison 1.875
+
+  The definitions of yystype and yyltype will be removed; use YYSTYPE and
+  YYLTYPE.
+
+  YYPARSE_PARAM and YYLEX_PARAM, deprecated in favor of %parse-param and
+  %lex-param, will no longer be supported.
+
+  Support for the preprocessor symbol YYERROR_VERBOSE will be removed, use
+  %error-verbose.
+
+*** The generated header will be included (yacc.c)
+
+  Instead of duplicating the content of the generated header (definition of
+  YYSTYPE, yyparse declaration etc.), the generated parser will include it,
+  as is already the case for GLR or C++ parsers.  This change is deferred
+  because existing versions of ylwrap (e.g., Automake 1.12.1) do not support
+  it.
+
+** Generated Parser Headers
+
+*** Guards (yacc.c, glr.c, glr.cc)
+
+  The generated headers are now guarded, as is already the case for C++
+  parsers (lalr1.cc).  For instance, with --defines=foo.h:
+
+    #ifndef YY_FOO_H
+    # define YY_FOO_H
+    ...
+    #endif /* !YY_FOO_H  */
+
+*** New declarations (yacc.c, glr.c)
+
+  The generated header now declares yydebug and yyparse.  Both honor
+  --name-prefix=bar_, and yield
+
+    int bar_parse (void);
+
+  rather than
+
+    #define yyparse bar_parse
+    int yyparse (void);
+
+  in order to facilitate the inclusion of several parser headers inside a
+  single compilation unit.
+
+*** Exported symbols in C++
+
+  The symbols YYTOKEN_TABLE and YYERROR_VERBOSE, which were defined in the
+  header, are removed, as they prevent the possibility of including several
+  generated headers from a single compilation unit.
+
+*** YYLSP_NEEDED
+
+  For the same reasons, the undocumented and unused macro YYLSP_NEEDED is no
+  longer defined.
+
+** New %define variable: api.prefix
+
+  Now that the generated headers are more complete and properly protected
+  against multiple inclusions, constant names, such as YYSTYPE are a
+  problem.  While yyparse and others are properly renamed by %name-prefix,
+  YYSTYPE, YYDEBUG and others have never been affected by it.  Because it
+  would introduce backward compatibility issues in projects not expecting
+  YYSTYPE to be renamed, instead of changing the behavior of %name-prefix,
+  it is deprecated in favor of a new %define variable: api.prefix.
+
+  The following examples compares both:
+
+    %name-prefix "bar_"               | %define api.prefix "bar_"
+    %token <ival> FOO                   %token <ival> FOO
+    %union { int ival; }                %union { int ival; }
+    %%                                  %%
+    exp: 'a';                           exp: 'a';
+
+  bison generates:
+
+    #ifndef BAR_FOO_H                   #ifndef BAR_FOO_H
+    # define BAR_FOO_H                  # define BAR_FOO_H
+
+    /* Enabling traces.  */             /* Enabling traces.  */
+    # ifndef YYDEBUG                  | # ifndef BAR_DEBUG
+                                      > #  if defined YYDEBUG
+                                      > #   if YYDEBUG
+                                      > #    define BAR_DEBUG 1
+                                      > #   else
+                                      > #    define BAR_DEBUG 0
+                                      > #   endif
+                                      > #  else
+    #  define YYDEBUG 0               | #   define BAR_DEBUG 0
+                                      > #  endif
+    # endif                           | # endif
+
+    # if YYDEBUG                      | # if BAR_DEBUG
+    extern int bar_debug;               extern int bar_debug;
+    # endif                             # endif
+
+    /* Tokens.  */                      /* Tokens.  */
+    # ifndef YYTOKENTYPE              | # ifndef BAR_TOKENTYPE
+    #  define YYTOKENTYPE             | #  define BAR_TOKENTYPE
+       enum yytokentype {             |    enum bar_tokentype {
+         FOO = 258                           FOO = 258
+       };                                  };
+    # endif                             # endif
+
+    #if ! defined YYSTYPE \           | #if ! defined BAR_STYPE \
+     && ! defined YYSTYPE_IS_DECLARED |  && ! defined BAR_STYPE_IS_DECLARED
+    typedef union YYSTYPE             | typedef union BAR_STYPE
+    {                                   {
+     int ival;                           int ival;
+    } YYSTYPE;                        | } BAR_STYPE;
+    # define YYSTYPE_IS_DECLARED 1    | # define BAR_STYPE_IS_DECLARED 1
+    #endif                              #endif
+
+    extern YYSTYPE bar_lval;          | extern BAR_STYPE bar_lval;
+
+    int bar_parse (void);               int bar_parse (void);
+
+    #endif /* !BAR_FOO_H  */            #endif /* !BAR_FOO_H  */
+
 * Noteworthy changes in release 2.5.1 (2012-06-05) [stable]

 ** Future changes:
@@ -37,10 +394,10 @@ GNU Bison NEWS
  The header files such as "parser.hh", "location.hh", etc. used a constant
  name for preprocessor guards, for instance:

-  #ifndef BISON_LOCATION_HH
-  # define BISON_LOCATION_HH
-  ...
-  #endif // !BISON_LOCATION_HH
+    #ifndef BISON_LOCATION_HH
+    # define BISON_LOCATION_HH
+    ...
+    #endif // !BISON_LOCATION_HH

  The inclusion guard is now computed from "PREFIX/FILE-NAME", where lower
  case characters are converted to upper case, and series of
@@ -48,10 +405,10 @@ GNU Bison NEWS

  With "bison -o lang++/parser.cc", "location.hh" would now include:

-  #ifndef YY_LANG_LOCATION_HH
-  # define YY_LANG_LOCATION_HH
-  ...
-  #endif // !YY_LANG_LOCATION_HH
+    #ifndef YY_LANG_LOCATION_HH
+    # define YY_LANG_LOCATION_HH
+    ...
+    #endif // !YY_LANG_LOCATION_HH

 *** C++ locations:

@@ -92,7 +449,7 @@ GNU Bison NEWS
  This includes warnings with some compilers, unexpected behavior of tools
  such as diff, warning messages from the test suite itself, etc.

-*** The install-pdf target work properly:
+*** The install-pdf target works properly:

  Running "make install-pdf" (or -dvi, -html, -info, and -ps) no longer
  halts in the middle of its course.
@@ -282,33 +639,33 @@ GNU Bison NEWS
  to use it.  If, for instance, your location structure has "first"
  and "last" members, instead of

-      # define YYLLOC_DEFAULT(Current, Rhs, N)                             \
-        do                                                                 \
-          if (N)                                                           \
-            {                                                              \
-              (Current).first = (Rhs)[1].location.first;                   \
-              (Current).last  = (Rhs)[N].location.last;                    \
-            }                                                              \
-          else                                                             \
-            {                                                              \
-              (Current).first = (Current).last = (Rhs)[0].location.last;   \
-            }                                                              \
-        while (false)
+    # define YYLLOC_DEFAULT(Current, Rhs, N)                             \
+      do                                                                 \
+        if (N)                                                           \
+          {                                                              \
+            (Current).first = (Rhs)[1].location.first;                   \
+            (Current).last  = (Rhs)[N].location.last;                    \
+          }                                                              \
+        else                                                             \
+          {                                                              \
+            (Current).first = (Current).last = (Rhs)[0].location.last;   \
+          }                                                              \
+      while (false)

  use:

-      # define YYLLOC_DEFAULT(Current, Rhs, N)                             \
-        do                                                                 \
-          if (N)                                                           \
-            {                                                              \
-              (Current).first = YYRHSLOC (Rhs, 1).first;                   \
-              (Current).last  = YYRHSLOC (Rhs, N).last;                    \
-            }                                                              \
-          else                                                             \
-            {                                                              \
-              (Current).first = (Current).last = YYRHSLOC (Rhs, 0).last;   \
-            }                                                              \
-        while (false)
+    # define YYLLOC_DEFAULT(Current, Rhs, N)                             \
+      do                                                                 \
+        if (N)                                                           \
+          {                                                              \
+            (Current).first = YYRHSLOC (Rhs, 1).first;                   \
+            (Current).last  = YYRHSLOC (Rhs, N).last;                    \
+          }                                                              \
+        else                                                             \
+          {                                                              \
+            (Current).first = (Current).last = YYRHSLOC (Rhs, 0).last;   \
+          }                                                              \
+      while (false)

 ** YYLLOC_DEFAULT in C++:

@@ -927,26 +1284,26 @@ GNU Bison NEWS
  if the symbols have destructors.  For instance:

     exp: exp "?" exp ":" exp { $1 ? $1 : $3; }
-	| exp "+" exp
-	;
+        | exp "+" exp
+        ;

  will trigger a warning about $$ and $5 in the first rule, and $3 in
  the second ($1 is copied to $$ by the default rule).  This example
  most likely contains three errors, and could be rewritten as:

     exp: exp "?" exp ":" exp
-	    { $$ = $1 ? $3 : $5; free ($1 ? $5 : $3); free ($1); }
-	| exp "+" exp
-	    { $$ = $1 ? $1 : $3; if ($1) free ($3); }
-	;
+            { $$ = $1 ? $3 : $5; free ($1 ? $5 : $3); free ($1); }
+        | exp "+" exp
+            { $$ = $1 ? $1 : $3; if ($1) free ($3); }
+        ;

  However, if the original actions were really intended, memory leaks
  and all, the warnings can be suppressed by letting Bison believe the
  values are used, e.g.:

     exp: exp "?" exp ":" exp { $1 ? $1 : $3; (void) ($$, $5); }
-	| exp "+" exp         { $$ = $1; (void) $3; }
-	;
+        | exp "+" exp         { $$ = $1; (void) $3; }
+        ;

  If there are mid-rule actions, the warning is issued if no action
  uses it.  The following triggers no warning: $1 and $3 are used.
@@ -1161,6 +1518,33 @@ GNU Bison NEWS
  - "parsing stack overflow..." -> "parser stack overflow"
    GLR parsers now report "parser stack overflow" as per the Bison manual.

+** %parse-param and %lex-param
+  The macros YYPARSE_PARAM and YYLEX_PARAM provide a means to pass
+  additional context to yyparse and yylex.  They suffer from several
+  shortcomings:
+
+  - a single argument only can be added,
+  - their types are weak (void *),
+  - this context is not passed to ancillary functions such as yyerror,
+  - only yacc.c parsers support them.
+
+  The new %parse-param/%lex-param directives provide a more precise control.
+  For instance:
+
+    %parse-param {int *nastiness}
+    %lex-param   {int *nastiness}
+    %parse-param {int *randomness}
+
+  results in the following signatures:
+
+    int yylex   (int *nastiness);
+    int yyparse (int *nastiness, int *randomness);
+
+  or, if both %pure-parser and %locations are used:
+
+    int yylex   (YYSTYPE *lvalp, YYLTYPE *llocp, int *nastiness);
+    int yyparse (int *nastiness, int *randomness);
+
 ** Bison now warns if it detects conflicting outputs to the same file,
  e.g., it generates a warning for "bison -d -o foo.h foo.y" since
  that command outputs both code and header to foo.h.
@@ -1190,16 +1574,16 @@ GNU Bison NEWS
  In agreement with POSIX and with other Yaccs, leaving a default
  action is valid when $$ is untyped, and $1 typed:

-	untyped: ... typed;
+        untyped: ... typed;

  but the converse remains an error:

-	typed: ... untyped;
+        typed: ... untyped;

 ** Values of mid-rule actions
  The following code:

-	foo: { ... } { $$ = $1; } ...
+        foo: { ... } { $$ = $1; } ...

  was incorrectly rejected: $1 is defined in the second mid-rule
  action, and is equal to the $$ of the first mid-rule action.
@@ -1281,9 +1665,9 @@ GNU Bison NEWS
 ** Incorrect "Token not used"
  On a grammar such as

-           %token useless useful
-           %%
-           exp: '0' %prec useful;
+    %token useless useful
+    %%
+    exp: '0' %prec useful;

  where a token was used to set the precedence of the last rule,
  bison reported both "useful" and "useless" as useless tokens.
@@ -1302,9 +1686,9 @@ GNU Bison NEWS
  the user symbol is used in the reports, the graphs, and the verbose
  error messages instead of "$end", which remains being the default.
  For instance
-     %token MYEOF 0
+    %token MYEOF 0
  or
-     %token MYEOF 0 "end of file"
+    %token MYEOF 0 "end of file"

 ** Semantic parser
  This old option, which has been broken for ages, is removed.
@@ -1340,9 +1724,9 @@ GNU Bison NEWS
  Previous versions don't complain when there is a type clash on
  the default action if the rule has a mid-rule action, such as in:

-      %type <foo> bar
-      %%
-      bar: '0' {} '0';
+    %type <foo> bar
+    %%
+    bar: '0' {} '0';

  This is fixed.

@@ -1639,9 +2023,12 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 LocalWords:  struct yystype DJGPP lex param Haible NUM alloca YYSTACK NUL goto
 LocalWords:  YYMAXDEPTH Unescaped UCNs YYLTYPE's yyltype typedefs inline Yaccs
 LocalWords:  Heriyanto Reenable dprec Hilfinger Eggert MYEOF Folle Menezes EOF
- LocalWords:  Lackovic define's itemset Groff Gettext malloc NEWS'ed YYDEBUG
+ LocalWords:  Lackovic define's itemset Groff Gettext malloc NEWS'ed YYDEBUG YY
 LocalWords:  namespaces strerror const autoconfiguration Dconst Autoconf's FDL
- LocalWords:  Automake TMPDIR LESSEQ
+ LocalWords:  Automake TMPDIR LESSEQ ylwrap endif yydebug YYTOKEN YYLSP ival hh
+ LocalWords:  extern YYTOKENTYPE TOKENTYPE yytokentype tokentype STYPE lval pdf
+ LocalWords:  lang yyoutput dvi html ps POSIX lvalp llocp calc yyo fval Wmaybe
+ LocalWords:  yyvsp pragmas noreturn java's

 Local Variables:
 mode: outline
@@ -1,5 +1,3 @@
-*- outline -*-
-
 This file attempts to describe the rules to use when hacking Bison.
 Don't put this file into the distribution.

@@ -45,34 +43,35 @@ These requirements do not apply when building from a distribution tarball.

 ** Requirements

-We've opted to keep only the highest-level sources in the repository.
-This eases our maintenance burden, (fewer merges etc.), but imposes more
+We've opted to keep only the highest-level sources in the repository.  This
+eases our maintenance burden, (fewer merges etc.), but imposes more
 requirements on anyone wishing to build from the just-checked-out sources.
 For example, you have to use the latest stable versions of the maintainer
 tools we depend upon, including:

- Automake <http://www.gnu.org/software/automake/>
 - Autoconf <http://www.gnu.org/software/autoconf/>
+- Automake <http://www.gnu.org/software/automake/>
 - Flex <http://www.gnu.org/software/flex/>
 - Gettext <http://www.gnu.org/software/gettext/>
+- Graphviz <http://www.graphviz.org>
 - Gzip <http://www.gnu.org/software/gzip/>
 - Perl <http://www.cpan.org/>
 - Rsync <http://samba.anu.edu.au/rsync/>
 - Tar <http://www.gnu.org/software/tar/>

-Valgrind <http://valgrind.org/> is also highly recommended, if
-Valgrind supports your architecture.
+Valgrind <http://valgrind.org/> is also highly recommended, if it supports
+your architecture.

-Bison is written using Bison grammars, so there are bootstrapping
-issues.  The bootstrap script attempts to discover when the C code
-generated from the grammars is out of date, and to bootstrap with an
-out-of-date version of the C code, but the process is not foolproof.
-Also, you may run into similar problems yourself if you modify Bison.
+Bison is written using Bison grammars, so there are bootstrapping issues.
+The bootstrap script attempts to discover when the C code generated from the
+grammars is out of date, and to bootstrap with an out-of-date version of the
+C code, but the process is not foolproof.  Also, you may run into similar
+problems yourself if you modify Bison.

-Only building the initial full source tree will be a bit painful.
-Later, after synchronizing from the repository a plain 'make' should
-be sufficient.  Note, however, that when gnulib is updated, running
-'./bootstrap' again might be needed.
+Only building the initial full source tree will be a bit painful.  Later,
+after synchronizing from the repository a plain 'make' should be sufficient.
+Note, however, that when gnulib is updated, running './bootstrap' again
+might be needed.

 ** First checkout

@@ -124,7 +123,7 @@ import requests for updated submodules.  A simple "git diff" will
 reveal if the current version of the submodule (i.e., the actual
 contents of the gnulib directory) and the current request from the
 subscriber (i.e., the reference of the version of gnulib that the
-Bison reporitory requests) differ.  To upgrade the submodules (i.e.,
+Bison repository requests) differ.  To upgrade the submodules (i.e.,
 to check out the version that is actually requested by the subscriber,
 run "git submodule update".

@@ -155,7 +154,7 @@ formal release, see the ChangeLog in the latest gnulib snapshot at:

        http://erislabs.net/ianb/projects/gnulib/

-The autoconf files we use are currently:
+The Autoconf files we use are currently:

        m4/m4.m4
        lib/m4sugar/m4sugar.m4
@@ -170,6 +169,36 @@ decide whether to update.
 ** make check
 Use liberally.

+** Typical errors
+If the test suite shows failures such as the following one
+
+  .../bison/lib/getopt.h:196:8: error: redefinition of 'struct option'
+  /usr/include/getopt.h:54:8: error: previous definition of 'struct option'
+
+it probably means that some file was compiled without
+AT_DATA_SOURCE_PROLOGUE.  This error is due to the fact that our -I options
+pick up gnulib's replacement headers, such as getopt.h, and this will go
+wrong if config.h was not included first.
+
+See tests/local.at for details.
+
+** make maintainer-check-valgrind
+This target uses valgrind both to check bison, and the generated parsers.
+
+This is not mature on Mac OS X.  First, Valgrind does support the way bison
+calls m4, so Valgrind cannot be used to check bison on Mac OS X.
+
+Second, there are many errors that come from the platform itself, not from
+bison.  build-aux/darwin11.4.0.valgrind addresses some of them.
+
+Third, valgrind issues warnings such as:
+
+  --99312:0:syswrap- WARNING: Ignoring sigreturn( ..., UC_RESET_ALT_STACK );
+
+which cause the test to fail uselessly.  It is hard to ignore these errors
+with a major overhaul of the way instrumentation is performed in the test
+suite.  So currently, do not try to run valgrind on Mac OS X.
+
 ** Release checks
 Try to run the test suite with more severe conditions before a
 release:
@@ -248,25 +277,13 @@ copyright statement for each Bison file, check the copyright statements
 that the skeletons insert into generated parsers, and check all
 occurrences of PACKAGE_COPYRIGHT_YEAR in configure.ac.

-** Update NEWS
-The version number, *and* the date of the release (including for
-betas).
+** Update NEWS, commit and tag.
+See do-release-commit-and-tag in README-release.  For a while, we used
+beta names such as "2.6_rc1".  Now that we use gnulib in the release
+procedure, we must use "2.5.90", which has the additional benefit of
+being properly sorted in "git tag -l".

-** Mention the release name in a commit message
-Should have an entry similar to "Version 2.3b.".
-
-** Tag the release
-Before Bison will build with the right version number, you must tag
-the release in git.  Do this after all other changes.  The command is
-similar to:
-
-  git tag -a v2.3b -m "Bison 2.3b."
-
-** Push
-Once "make distcheck" passes, push your changes and the tag.
-"git push" without arguments will not push the tag.
-
-** make alpha, beta, or release
+** make alpha, beta, or stable
 See README-release.

 ** Upload
@@ -287,8 +304,8 @@ where F125BDF3 should be replaced with your key ID.
 *** Using gnupload
 You need "ncftp".

-At the end "make release" (or alpha/beta) will display the prodecure
-to run.  Just copy and paste it in your shell.
+At the end "make stable" (or alpha/beta) will display the procedure to
+run.  Just copy and paste it in your shell.

 *** By hand

@@ -359,7 +376,8 @@ function 'index', once for the table of contents); you can ignore this
 issue.

 ** Announce
-To generate a template announcement file:
+The "make stable" (or alpha/beta) command just created a template,
+$HOME/announce-bison-X.Y.  Otherwise, to generate it, run:

  make RELEASE_TYPE=alpha gpg_key_ID=F125BDF3 announcement

@@ -379,15 +397,15 @@ newsgroup by sending email to [email protected].  Do not make any Cc as
 the moderator will throw away anything cross-posted or Cc'ed.  It really
 needs to be a separate message.

-** Bump the version number
-In configure.ac.  Run "make".  So that developers don't accidentally add new
-items to the old NEWS entry, create a new empty NEWS entry something like:
+** Prepare NEWS
+So that developers don't accidentally add new items to the old NEWS
+entry, create a new empty entry in line 3 (without the two leading
+spaces):

-  Changes in version ?.? (????-??-??):
+  * Noteworthy changes in release ?.? (????-??-??) [?]

 Push these changes.

-
 -----

 Copyright (C) 2002-2005, 2007-2012 Free Software Foundation, Inc.
@@ -406,3 +424,14 @@ GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+ LocalWords:  Automake Autoconf Gettext Gzip Rsync Valgrind gnulib submodules
+ LocalWords:  submodule init cd distcheck checkin ChangeLog valgrind sigreturn
+ LocalWords:  UC gcc DGNULIB POSIXCHECK xml XSLT glr lalr README po runtime rc
+ LocalWords:  gnupload gnupg gpg keyserver BDF ncftp filename clearsign cvs dir
+ LocalWords:  symlinks vti html lt POSIX Cc'ed
+
+Local Variables:
+mode: outline
+fill-column: 76
+End:
@@ -1,11 +1,12 @@
 Bison was originally written by Robert Corbett.  It would not be what
 it is today without the invaluable help of these people:

+Аскар Сафин              [email protected]
 Airy Andre                [email protected]
-Akim Demaille             akim@freefriends.org
+Akim Demaille             akim@lrde.epita.fr
 Albert Chin-A-Young       [email protected]
 Alexander Belopolsky      [email protected]
-Alexandre Duret-Lutz      adl@src.lip6.fr
+Alexandre Duret-Lutz      adl@lrde.epita.fr
 Andreas Schwab            [email protected]
 Andrew Suffield           [email protected]
 Angelo Borsotti           [email protected]
@@ -13,6 +14,7 @@ Anthony Heading           [email protected]
 Arnold Robbins            [email protected]
 Art Haas                  [email protected]
 Baron Schwartz            [email protected]
+Ben Pfaff                 [email protected]
 Benoit Perrot             [email protected]
 Bernd Kiefer              [email protected]
 Bert Deknuydt             [email protected]
@@ -30,6 +32,7 @@ Dagobert Michelsen        [email protected]
 Daniel Hagerty            [email protected]
 David J. MacKenzie        [email protected]
 David Kastrup             [email protected]
+Dennis Clarke             [email protected]
 Derek M. Jones            [email protected]
 Di-an Jan                 [email protected]
 Dick Streefland           [email protected]
@@ -43,6 +46,7 @@ Frank Heckenbach          [email protected]
 Frans Englich             [email protected]
 Georg Sauthoff            [email protected]
 George Neuner             [email protected]
+Gilles Espinasse          [email protected]
 Goran Uddeborg            [email protected]
 Guido Trentalancia        [email protected]
 H. Merijn Brand           [email protected]
@@ -54,6 +58,7 @@ Jim Kent                  [email protected]
 Jim Meyering              [email protected]
 Joel E. Denny             [email protected]
 Johan van Selst           [email protected]
+Jonathan Fabrizio         [email protected]
 Jonathan Nieder           [email protected]
 Juan Manuel Guerrero      [email protected]
 Kees Zeelenberg           [email protected]
@@ -62,6 +67,8 @@ Laurent Mascherpa         [email protected]
 Lie Yan                   [email protected]
 Magnus Fromreide          [email protected]
 Marc Autret               [email protected]
+Marc Mendiola             [email protected]
+Mark Boyall               [email protected]
 Martin Jacobs             [email protected]
 Martin Mokrejs            [email protected]
 Martin Nylin              [email protected]
@@ -78,19 +85,23 @@ Nicolas Tisserand         [email protected]
 Noah Friedman             [email protected]
 Odd Arild Olsen           [email protected]
 Oleg Smolsky              [email protected]
+Oleksii Taran             [email protected]
 Paolo Bonzini             [email protected]
 Pascal Bart               [email protected]
 Paul Eggert               [email protected]
 Paul Hilfinger            [email protected]
 Per Allansson             [email protected]
+Peter Eisentraut          [email protected]
 Peter Fales               [email protected]
 Peter Hamorsky            [email protected]
+Peter Simons              [email protected]
 Piotr Gackiewicz          [email protected]
 Quoc Peyrot               [email protected]
 R Blake                   [email protected]
 Raja R Harinath           [email protected]
 Ralf Wildenhues           [email protected]
 Richard Stallman          [email protected]
+Rob Vermaas               [email protected]
 Robert Anisko             [email protected]
 Satya Kiran Popuri        [email protected]
 Sebastian Setzer          [email protected]
@@ -99,7 +110,8 @@ Sergei Steshenko          [email protected]
 Shura                     [email protected]
 Stefano Lattarini         [email protected]
 Steve Murphy              [email protected]
-Summum Bonum              [email protected]
+Sum Wu                    [email protected]
+Théophile Ranquet         [email protected]
 Thiru Ramakrishnan        [email protected]
 Tim Josling               [email protected]
 Tim Landscheidt           [email protected]
@@ -123,6 +135,7 @@ thank them!  Please, help us keeping this list up to date.

 Local Variables:
 mode: text
+coding: utf-8
 End:

 -----
@@ -1,4 +1,17 @@
 * Short term
+** Graphviz display code thoughts
+The code for the --graph option is over two files: print_graph, and
+graphviz. I believe this is because Bison used to also produce VCG graphs,
+but since this is no longer true, maybe we could consider these files for
+fusion.
+
+Little effort factoring seems to have been given to factoring in these files,
+and their print-xml and print counterpart. We would very much like to re-use
+the pretty format of states from .output in the .dot
+
+Also, the underscore in print_graph.[ch] isn't very fitting considering
+the dashes in the other filenames.
+
 ** Variable names.
 What should we name `variant' and `lex_symbol'?

@@ -126,12 +139,6 @@ The code bw glr.c and yacc.c is really alike, we can certainly factor
 some parts.


-* Yacc.c: CPP Macros
-
-Do some people use YYPURE, YYLSP_NEEDED like we do in the test suite?
-They should not: it is not documented.  But if they need to, let's
-find something clean (not like YYLSP_NEEDED...).
-
 * Report

 ** Figures
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Print a version string.
-scriptversion=2012-05-15.06; # UTC
+scriptversion=2012-07-19.14; # UTC

 # Bootstrap this package from checked-out sources.

@@ -77,6 +77,33 @@ Running without arguments will suffice in most cases.
 EOF
 }

+# warnf_ FORMAT-STRING ARG1...
+warnf_ ()
+{
+  warnf_format_=$1
+  shift
+  nl='
+'
+  case $* in
+    *$nl*) me_=$(printf "$me"|tr "$nl|" '??')
+       printf "$warnf_format_" "$@" | sed "s|^|$me_: |" ;;
+    *) printf "$me: $warnf_format_" "$@" ;;
+  esac >&2
+}
+
+# warn_ WORD1...
+warn_ ()
+{
+  # If IFS does not start with ' ', set it and emit the warning in a subshell.
+  case $IFS in
+    ' '*) warnf_ '%s\n' "$*";;
+    *)    (IFS=' '; warn_ "$@");;
+  esac
+}
+
+# die WORD1...
+die() { warn_ "$@"; exit 1; }
+
 # Configuration.

 # Name of the Makefile.am
@@ -130,7 +157,8 @@ extract_package_name='
     p
  }
 '
-package=$(sed -n "$extract_package_name" configure.ac) || exit
+package=$(sed -n "$extract_package_name" configure.ac) \
+  || die 'cannot find package name in configure.ac'
 gnulib_name=lib$package

 build_aux=build-aux
@@ -186,6 +214,8 @@ use_git=true
 # otherwise find the first of the NAMES that can be run (i.e.,
 # supports --version).  If found, set ENVVAR to the program name,
 # die otherwise.
+#
+# FIXME: code duplication, see also gnu-web-doc-update.
 find_tool ()
 {
  find_tool_envvar=$1
@@ -203,19 +233,15 @@ find_tool ()
  else
    find_tool_error_prefix="\$$find_tool_envvar: "
  fi
-  if test x"$find_tool_res" = x; then
-    echo >&2 "$me: one of these is required: $find_tool_names"
-    exit 1
-  fi
-  ($find_tool_res --version </dev/null) >/dev/null 2>&1 || {
-    echo >&2 "$me: ${find_tool_error_prefix}cannot run $find_tool_res --version"
-    exit 1
-  }
+  test x"$find_tool_res" != x \
+    || die "one of these is required: $find_tool_names"
+  ($find_tool_res --version </dev/null) >/dev/null 2>&1 \
+    || die "${find_tool_error_prefix}cannot run $find_tool_res --version"
  eval "$find_tool_envvar=\$find_tool_res"
  eval "export $find_tool_envvar"
 }

-# Find sha1sum, named gsha1sum on MacPorts, and shasum on MacOS 10.6.
+# Find sha1sum, named gsha1sum on MacPorts, and shasum on Mac OS X 10.6.
 find_tool SHA1SUM sha1sum gsha1sum shasum

 # Override the default configuration, if necessary.
@@ -230,7 +256,6 @@ esac
 test -z "${gnulib_extra_files}" && \
  gnulib_extra_files="
        $build_aux/install-sh
-        $build_aux/missing
        $build_aux/mdate-sh
        $build_aux/texinfo.tex
        $build_aux/depcomp
@@ -270,21 +295,15 @@ do
  --no-git)
    use_git=false;;
  *)
-    echo >&2 "$0: $option: unknown option"
-    exit 1;;
+    die "$option: unknown option";;
  esac
 done

-if $use_git || test -d "$GNULIB_SRCDIR"; then
-  :
-else
-  echo "$0: Error: --no-git requires --gnulib-srcdir" >&2
-  exit 1
-fi
+$use_git || test -d "$GNULIB_SRCDIR" \
+  || die "Error: --no-git requires --gnulib-srcdir"

 if test -n "$checkout_only_file" && test ! -r "$checkout_only_file"; then
-  echo "$0: Bootstrapping from a non-checked-out distribution is risky." >&2
-  exit 1
+  die "Bootstrapping from a non-checked-out distribution is risky."
 fi

 # Ensure that lines starting with ! sort last, per gitignore conventions
@@ -310,7 +329,7 @@ insert_sorted_if_absent() {
  echo "$str" | sort_patterns - $file | cmp -s - $file > /dev/null \
    || { echo "$str" | sort_patterns - $file > $file.bak \
      && mv $file.bak $file; } \
-    || exit 1
+    || die "insert_sorted_if_absent $file $str: failed"
 }

 # Adjust $PATTERN for $VC_IGNORE_FILE and insert it with
@@ -334,11 +353,8 @@ grep '^[	 ]*AC_CONFIG_AUX_DIR(\['"$build_aux"'\])' configure.ac \
    >/dev/null && found_aux_dir=yes
 grep '^[	 ]*AC_CONFIG_AUX_DIR('"$build_aux"')' configure.ac \
    >/dev/null && found_aux_dir=yes
-if test $found_aux_dir = no; then
-  echo "$0: expected line not found in configure.ac. Add the following:" >&2
-  echo "  AC_CONFIG_AUX_DIR([$build_aux])" >&2
-  exit 1
-fi
+test $found_aux_dir = yes \
+  || die "configure.ac lacks 'AC_CONFIG_AUX_DIR([$build_aux])'; add it"

 # If $build_aux doesn't exist, create it now, otherwise some bits
 # below will malfunction.  If creating it, also mark it as ignored.
@@ -444,7 +460,7 @@ check_versions() {
      automake-ng|aclocal-ng)
        app=${app%-ng}
        ($app --version | grep '(GNU automake-ng)') >/dev/null 2>&1 || {
-          echo "$me: Error: '$app' not found or not from Automake-NG" >&2
+          warn_ "Error: '$app' not found or not from Automake-NG"
          ret=1
          continue
        } ;;
@@ -454,20 +470,21 @@ check_versions() {
      # so we have to rely on $? rather than get_version.
      $app --version >/dev/null 2>&1
      if [ 126 -le $? ]; then
-        echo "$me: Error: '$app' not found" >&2
+        warn_ "Error: '$app' not found"
        ret=1
      fi
    else
      # Require app to produce a new enough version string.
      inst_ver=$(get_version $app)
      if [ ! "$inst_ver" ]; then
-        echo "$me: Error: '$app' not found" >&2
+        warn_ "Error: '$app' not found"
        ret=1
      else
        latest_ver=$(sort_ver $req_ver $inst_ver | cut -d' ' -f2)
        if [ ! "$latest_ver" = "$inst_ver" ]; then
-          echo "$me: Error: '$app' version == $inst_ver is too old" >&2
-          echo "       '$app' version >= $req_ver is required" >&2
+          warnf_ '%s\n'                                        \
+              "Error: '$app' version == $inst_ver is too old"  \
+              "       '$app' version >= $req_ver is required"
          ret=1
        fi
      fi
@@ -524,11 +541,10 @@ fi
 if ! printf "$buildreq" | check_versions; then
  echo >&2
  if test -f README-prereq; then
-    echo "$0: See README-prereq for how to get the prerequisite programs" >&2
+    die "See README-prereq for how to get the prerequisite programs"
  else
-    echo "$0: Please install the prerequisite programs" >&2
+    die "Please install the prerequisite programs"
  fi
-  exit 1
 fi

 echo "$0: Bootstrapping from checked-out $package sources..."
@@ -739,11 +755,10 @@ symlink_to_dir()
        *)
          case /$dst/ in
          *//* | */../* | */./* | /*/*/*/*/*/)
-             echo >&2 "$me: invalid symlink calculation: $src -> $dst"
-             exit 1;;
-          /*/*/*/*/)	dot_dots=../../../;;
-          /*/*/*/)	dot_dots=../../;;
-          /*/*/)	dot_dots=../;;
+             die "invalid symlink calculation: $src -> $dst";;
+          /*/*/*/*/)    dot_dots=../../../;;
+          /*/*/*/)      dot_dots=../../;;
+          /*/*/)        dot_dots=../;;
          esac;;
        esac

@@ -765,7 +780,7 @@ version_controlled_file() {
    grep -F "/${file##*/}/" "$parent/CVS/Entries" 2>/dev/null |
             grep '^/[^/]*/[0-9]' > /dev/null
  else
-    echo "$me: no version control for $file?" >&2
+    warn_ "no version control for $file?"
    false
  fi
 }
@@ -855,11 +870,12 @@ echo "$0: $gnulib_tool $gnulib_tool_options --import ..."
 $gnulib_tool $gnulib_tool_options --import $gnulib_modules &&

 for file in $gnulib_files; do
-  symlink_to_dir "$GNULIB_SRCDIR" $file || exit
+  symlink_to_dir "$GNULIB_SRCDIR" $file \
+    || die "failed to symlink $file"
 done

 bootstrap_post_import_hook \
-  || { echo >&2 "$me: bootstrap_post_import_hook failed"; exit 1; }
+  || die "bootstrap_post_import_hook failed"

 # Remove any dangling symlink matching "*.m4" or "*.[ch]" in some
 # gnulib-populated directories.  Such .m4 files would cause aclocal to fail.
@@ -887,7 +903,7 @@ echo "running: AUTOPOINT=true LIBTOOLIZE=true " \
    "$AUTORECONF --verbose --install $no_recursive -I $m4_base $ACLOCAL_FLAGS"
 AUTOPOINT=true LIBTOOLIZE=true \
    $AUTORECONF --verbose --install $no_recursive -I $m4_base $ACLOCAL_FLAGS \
-  || exit 1
+  || die "autoreconf failed"

 # Get some extra files from gnulib, overriding existing files.
 for file in $gnulib_extra_files; do
@@ -896,7 +912,8 @@ for file in $gnulib_extra_files; do
  build-aux/*) dst=$build_aux/${file#build-aux/};;
  *) dst=$file;;
  esac
-  symlink_to_dir "$GNULIB_SRCDIR" $file $dst || exit
+  symlink_to_dir "$GNULIB_SRCDIR" $file $dst \
+    || die "failed to symlink $file"
 done

 if test $with_gettext = yes; then
@@ -912,7 +929,8 @@ if test $with_gettext = yes; then
      a\
          '"$XGETTEXT_OPTIONS"' $${end_of_xgettext_options+}
    }
-  ' po/Makevars.template >po/Makevars || exit 1
+  ' po/Makevars.template >po/Makevars \
+    || die 'cannot generate po/Makevars'

  # If the 'gettext' module is in use, grab the latest Makefile.in.in.
  # If only the 'gettext-h' module is in use, assume autopoint already
@@ -920,7 +938,8 @@ if test $with_gettext = yes; then
  case $gnulib_modules in
  *gettext-h*) ;;
  *gettext*)
-    cp $GNULIB_SRCDIR/build-aux/po/Makefile.in.in po/Makefile.in.in || exit 1
+    cp $GNULIB_SRCDIR/build-aux/po/Makefile.in.in po/Makefile.in.in \
+      || die "cannot create po/Makefile.in.in"
    ;;
  esac

@@ -936,7 +955,8 @@ if test $with_gettext = yes; then
        a\
            '"$XGETTEXT_OPTIONS_RUNTIME"' $${end_of_xgettext_options+}
      }
-    ' po/Makevars.template >runtime-po/Makevars || exit 1
+    ' po/Makevars.template >runtime-po/Makevars \
+    || die 'cannot generate runtime-po/Makevars'

    # Copy identical files from po to runtime-po.
    (cd po && cp -p Makefile.in.in *-quot *.header *.sed *.sin ../runtime-po)
@@ -17,15 +17,19 @@

 # gnulib modules used by this package.
 gnulib_modules='
-  announce-gen argmatch assert calloc-posix close closeout config-h c-strcase
+  argmatch assert calloc-posix close closeout config-h c-strcase
  configmake
  dirname
-  do-release-commit-and-tag
-  error extensions fdl fopen-safer gendocs getopt-gnu
+  error extensions fdl fopen-safer
+  getline
+  getopt-gnu
  gettext git-version-gen gitlog-to-changelog
  gpl-3.0 hash inttypes isnan javacomp-script
-  javaexec-script ldexpl maintainer-makefile malloc-gnu mbschr mbsrchr
-  mbswidth obstack perror progname
+  javaexec-script ldexpl malloc-gnu mbschr mbsrchr
+  mbswidth
+  obstack
+  obstack-printf
+  perror progname
  quote quotearg
  readme-release
  realloc-posix
@@ -8,9 +8,12 @@
 /config.rpath
 /config.sub
 /depcomp
+/do-release-commit-and-tag
 /gendocs.sh
 /git-version-gen
 /gitlog-to-changelog
+/gnu-web-doc-update
+/gnupload
 /install-sh
 /javacomp.sh.in
 /javaexec.sh.in
@@ -23,4 +26,3 @@
 /vc-list-files
 /warn-on-use.h
 /ylwrap
-/do-release-commit-and-tag
@@ -1,2 +1,20 @@
-## Process this file with automake to produce Makefile.in -*-Makefile-*-
-EXTRA_DIST = prev-version.txt cross-options.pl update-b4-copyright
+## Copyright (C) 2006, 2009-2012 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+EXTRA_DIST =					\
+  cross-options.pl				\
+  darwin11.4.0.valgrind				\
+  prev-version.txt				\
+  update-b4-copyright
@@ -0,0 +1,64 @@
+# Copyright (C) 2012 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Valgrind suppression file for Bison.
+
+{
+   Mac OS X initialization
+   Memcheck:Leak
+   fun:?alloc*
+   ...
+   fun:*ImageLoader*
+}
+
+{
+   Mac OS X initialization
+   Memcheck:Leak
+   fun:?alloc*
+   ...
+   fun:*dyld*
+}
+
+{
+   Mac OS X initialization
+   Memcheck:Leak
+   fun:?alloc*
+   ...
+   fun:__CFInitialize
+}
+
+{
+   Mac OS X I/O buffer
+   Memcheck:Leak
+   fun:malloc
+   fun:__smakebuf
+   fun:__swsetup
+   fun:__sfvwrite
+   fun:fwrite
+}
+
+{
+   Mac OS X I/O buffer
+   Memcheck:Leak
+   fun:malloc
+   fun:__smakebuf
+   fun:__swsetup
+   fun:__swbuf
+   fun:putchar
+}
+
+# Local Variables:
+# mode: shell-script
+# End:
@@ -1,3 +1,8 @@
 # This file is expected to be used via gitlog-to-changelog's --amend=FILE
 # option.  It specifies what changes to make to each given SHA1's commit
 # log and metadata, using Perl-eval'able expressions.
+
+0db2648930e3b6c376a539aabe368aade83ee29a
+s/--flags/--feature/;
+s/flag_flag/feature_flag/;
+s/\bflag\b/feature/;
@@ -0,0 +1,4 @@
+/_Noreturn.h
+/arg-nonnull.h
+/c++defs.h
+/warn-on-use.h
@@ -1,5 +1,4 @@
 # Customize maint.mk                           -*- makefile -*-
-
 # Copyright (C) 2008-2012 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
@@ -15,6 +14,18 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

+# Update version, then recompile so that tests/bison --version be
+# up-to-date, then compile our parser again with our up-to-date bison.
+.PHONY: regen
+regen: _version
+	$(MAKE) $(AM_MAKEFLAGS)
+	touch $(srcdir)/src/parse-gram.y
+	$(MAKE) $(AM_MAKEFLAGS)
+
+# Used in maint.mk's web-manual rule
+manual_title = The Yacc-compatible Parser Generator
+gendocs_options_ = -I $(abs_top_srcdir)/doc -I $(abs_top_builddir)/doc
+
 # It's useful to run maintainer-*check* targets during development, but we
 # don't want to wait on a recompile because of an update to $(VERSION).  Thus,
 # override the _is-dist-target from GNUmakefile so that maintainer-*check*
@@ -22,13 +33,6 @@
 _is-dist-target = $(filter-out %clean maintainer-check% maintainer-%-check, \
  $(filter maintainer-% dist% alpha beta major,$(MAKECMDGOALS)))

-# Use alpha.gnu.org for alpha and beta releases.
-# Use ftp.gnu.org for major releases.
-gnu_ftp_host-alpha = alpha.gnu.org
-gnu_ftp_host-beta = alpha.gnu.org
-gnu_ftp_host-major = ftp.gnu.org
-gnu_rel_host = $(gnu_ftp_host-$(RELEASE_TYPE))
-
 url_dir_list = \
  ftp://$(gnu_rel_host)/gnu/bison

@@ -57,17 +61,33 @@ update-copyright: update-b4-copyright update-package-copyright-year
 update-copyright-env = \
  UPDATE_COPYRIGHT_FORCE=1 UPDATE_COPYRIGHT_USE_INTERVALS=1

-exclude = $(foreach a,$(1),$(eval exclude_file_name_regexp--sc_$(a)))
+# At least for Mac OS X's grep, the order between . and [ in "[^.[]"
+# matters:
+# $ LC_ALL=fr_FR grep -nE '[^[.]' /dev/null
+# $ LC_ALL=C grep -nE '[^[.]' /dev/null
+# grep: invalid collating element or class
+# $ LC_ALL=fr_FR grep -nE '[^.[]' /dev/null
+# $ LC_ALL=C grep -nE '[^.[]' /dev/null
+sc_at_parser_check:
+	@prohibit='AT_PARSER_CHECK\(\[+[^.[]|AT_CHECK\(\[+\./'		\
+	halt='use AT_PARSER_CHECK for and only for generated parsers'	\
+	  $(_sc_search_regexp)
+
+exclude = \
+  $(foreach a,$(1),$(eval $(subst $$,$$$$,exclude_file_name_regexp--sc_$(a))))
 $(call exclude,								\
  bindtextdomain=^lib/main.c$$						\
  program_name=^lib/main.c$$						\
-  prohibit_always-defined_macros=^data/yacc.c|^djgpp/			\
+  prohibit_always-defined_macros=^data/yacc.c$$|^djgpp/			\
  prohibit_always-defined_macros+=?|^lib/timevar.c$$			\
  prohibit_always-defined_macros+=?|^src/(parse-gram.c|system.h)$$	\
  prohibit_always-defined_macros+=?|^tests/regression.at$$		\
-  prohibit_empty_lines_at_EOF=^src/parse-gram.[ch]$$			\
+  prohibit_defined_have_decl_tests=?|^lib/timevar.c$$			\
+  prohibit_doubled_word=^tests/named-refs.at$$                          \
+  prohibit_magic_number_exit=^doc/bison.texi$$				\
+  prohibit_magic_number_exit+=?|^tests/(conflicts|regression).at$$	\
  require_config_h_first=^(lib/yyerror|data/(glr|yacc))\.c$$		\
  space_tab=^tests/(input|c\+\+)\.at$$					\
  trailing_blank=^src/parse-gram.[ch]$$					\
-  unmarked_diagnostics=^djgpp/						\
+  unmarked_diagnostics=^(djgpp/|doc/bison.texi$$|tests/c\+\+\.at$$)	\
 )
@@ -58,6 +58,20 @@ AC_PROG_CXX
 # Gnulib (early checks).
 gl_EARLY

+# Gnulib uses '#pragma GCC diagnostic push' to silence some
+# warnings, but older gcc doesn't support this.
+AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
+  [lv_cv_gcc_pragma_push_works], [
+  save_CFLAGS=$CFLAGS
+  CFLAGS='-Wunknown-pragmas -Werror'
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+    #pragma GCC diagnostic push
+    #pragma GCC diagnostic pop
+  ]])],
+  [lv_cv_gcc_pragma_push_works=yes],
+  [lv_cv_gcc_pragma_push_works=no])
+  CFLAGS=$save_CFLAGS])
+
 AC_ARG_ENABLE([gcc-warnings],
 [  --enable-gcc-warnings   turn on lots of GCC warnings (not recommended)],
 [case $enable_gcc_warnings in
@@ -67,37 +81,62 @@ AC_ARG_ENABLE([gcc-warnings],
              [enable_gcc_warnings=no])
 if test "$enable_gcc_warnings" = yes; then
  warn_common='-Wall -Wextra -Wno-sign-compare -Wcast-align
-    -Wcast-qual -Wformat -Wpointer-arith -Wwrite-strings'
-  warn_c='-Wbad-function-cast -Wmissing-declarations -Wmissing-prototypes
-    -Wshadow -Wstrict-prototypes'
+    -Wformat -Wpointer-arith -Wwrite-strings'
+  warn_c='-Wbad-function-cast -Wshadow -Wstrict-prototypes'
  warn_cxx='-Wnoexcept'
  AC_LANG_PUSH([C])
+  # Clang supports many of GCC's -W options, but only issues warnings
+  # on the ones it does not recognize.  In that case, gl_WARN_ADD
+  # thinks the option is supported, and unknown options are then added
+  # to CFLAGS.  But then, when -Werror is added in the test suite for
+  # instance, the warning about the unknown option turns into an
+  # error.
+  #
+  # This should be addressed by gnulib's gl_WARN_ADD, but in the
+  # meanwhile, turn warnings about unknown options into errors in
+  # CFLAGS, and restore CFLAGS after the tests.
+  save_CFLAGS=$CFLAGS
+  gl_WARN_ADD([-Werror=unknown-warning-option], [CFLAGS])
  for i in $warn_common $warn_c;
  do
    gl_WARN_ADD([$i], [WARN_CFLAGS])
  done
  gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
+
+  # Warnings for the test suite, and maybe for bison if GCC is modern
+  # enough.
+  gl_WARN_ADD([-Wmissing-declarations], [WARN_CFLAGS_TEST])
+  gl_WARN_ADD([-Wmissing-prototypes], [WARN_CFLAGS_TEST])
+  test $lv_cv_gcc_pragma_push_works = yes &&
+    AS_VAR_APPEND([WARN_CFLAGS], [" $WARN_CFLAGS_TEST"])
+
  # Warnings for the test suite only.
  gl_WARN_ADD([-Wundef], [WARN_CFLAGS_TEST])
  gl_WARN_ADD([-pedantic], [WARN_CFLAGS_TEST])
+  CFLAGS=$save_CFLAGS
  AC_LANG_POP([C])

+
  AC_LANG_PUSH([C++])
+  save_CXXFLAGS=$CXXFLAGS
+  gl_WARN_ADD([-Werror=unknown-warning-option], [CXXFLAGS])
  for i in $warn_common $warn_cxx;
  do
    gl_WARN_ADD([$i], [WARN_CXXFLAGS])
  done
-  gl_WARN_ADD([ -Wzero-as-null-pointer-constant], [WARN_CXXFLAGS],
+  gl_WARN_ADD([-Wzero-as-null-pointer-constant], [WARN_CXXFLAGS],
              [AC_LANG_PROGRAM([], [nullptr])])
  gl_WARN_ADD([-Werror], [WERROR_CXXFLAGS])
  # Warnings for the test suite only.
  gl_WARN_ADD([-Wundef], [WARN_CXXFLAGS_TEST])
  gl_WARN_ADD([-pedantic], [WARN_CXXFLAGS_TEST])
+  CXXFLAGS=$save_CXXFLAGS
  AC_LANG_POP([C++])
 fi

 BISON_TEST_FOR_WORKING_C_COMPILER
 BISON_TEST_FOR_WORKING_CXX_COMPILER
+BISON_C_COMPILER_POSIXLY_CORRECT

 AC_ARG_ENABLE([yacc],
  [AC_HELP_STRING([--disable-yacc],
@@ -115,6 +154,7 @@ AC_SUBST([YACC_SCRIPT])
 AC_SUBST([YACC_LIBRARY])

 # Checks for programs.
+AM_MISSING_PROG([DOT], [dot])
 AC_PROG_LEX
 $LEX_IS_FLEX || AC_MSG_ERROR([Flex is required])
 AC_PROG_YACC
@@ -123,6 +163,10 @@ AC_PROG_GNU_M4
 AC_DEFINE_UNQUOTED([M4], ["$M4"], [Define to the GNU M4 executable name.])
 AC_DEFINE_UNQUOTED([M4_GNU_OPTION], ["$M4_GNU"], [Define to "-g" if GNU M4
 supports -g, otherwise to "".])
+AC_PATH_PROG([PERL], [perl])
+if test -z "$PERL"; then
+   AC_MSG_ERROR([perl not found])
+fi
 AM_MISSING_PROG([HELP2MAN], [help2man])
 AC_PATH_PROG([XSLTPROC], [xsltproc])
 AC_SUBST([XSLTPROC])
@@ -163,6 +207,16 @@ AC_CONFIG_TESTDIR(tests)
 AC_CONFIG_FILES([tests/Makefile tests/atlocal])
 AC_CONFIG_FILES([tests/bison], [chmod +x tests/bison])
 AC_CHECK_PROGS([VALGRIND], [valgrind])
+case $VALGRIND:$host_os in
+  '':*) ;;
+  *:darwin*)
+    # See README-hacking.
+    # VALGRIND+=' --suppressions=$(abs_top_srcdir)/build-aux/darwin11.4.0.valgrind'
+    VALGRIND=;;
+  *:*)
+    AC_SUBST([VALGRIND_PREBISON], ["$VALGRIND -q"]);;
+esac
+
 AM_MISSING_PROG([AUTOM4TE], [autom4te])
 # Needed by tests/atlocal.in.
 AC_SUBST([GCC])
@@ -14,6 +14,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

 dist_pkgdata_DATA = README bison.m4 \
+   c-like.m4 \
   c-skel.m4 c.m4 yacc.c glr.c \
   c++-skel.m4 c++.m4 location.cc lalr1.cc glr.cc stack.hh \
   java-skel.m4 java.m4 lalr1.java
@@ -58,6 +58,30 @@ This special exception was added by the Free Software Foundation in
 version 2.2 of Bison.])])


+## -------- ##
+## Output.  ##
+## -------- ##
+
+# b4_output_begin(FILE)
+# ---------------------
+# Enable output, i.e., send to diversion 0, expand after "#", and
+# generate the tag to output into FILE.  Must be followed by EOL.
+m4_define([b4_output_begin],
+[m4_changecom()
+m4_divert_push(0)dnl
+@output(m4_unquote([$1])@)@dnl
+])
+
+
+# b4_output_end()
+# ---------------
+# Output nothing, restore # as comment character (no expansions after #).
+m4_define([b4_output_end],
+[m4_divert_pop(0)
+m4_changecom([#])
+])
+
+
 ## ---------------- ##
 ## Error handling.  ##
 ## ---------------- ##
@@ -183,21 +207,6 @@ m4_define([b4_fatal_at],
 m4_exit(1)])


-## ---------------- ##
-## Default values.  ##
-## ---------------- ##
-
-# m4_define_default([b4_lex_param], [])   dnl breaks other skeletons
-m4_define_default([b4_pre_prologue], [])
-m4_define_default([b4_post_prologue], [])
-m4_define_default([b4_epilogue], [])
-m4_define_default([b4_parse_param], [])
-
-# The initial column and line.
-m4_define_default([b4_location_initial_column], [1])
-m4_define_default([b4_location_initial_line],   [1])
-
-
 ## ------------ ##
 ## Data Types.  ##
 ## ------------ ##
@@ -233,9 +242,9 @@ m4_define([b4_define_flag_if],

 # _b4_define_flag_if($1, $2, FLAG)
 # --------------------------------
-# This macro works around the impossibility to define macros
-# inside macros, because issuing `[$1]' is not possible in M4 :(.
-# This sucks hard, GNU M4 should really provide M5 like $$1.
+# Work around the impossibility to define macros inside macros,
+# because issuing `[$1]' is not possible in M4.  GNU M4 should provide
+# $$1 a la M5/TeX.
 m4_define([_b4_define_flag_if],
 [m4_if([$1$2], $[1]$[2], [],
       [m4_fatal([$0: Invalid arguments: $@])])dnl
@@ -246,17 +255,17 @@ m4_define([b4_$3_if],
 # b4_FLAG_if(IF-TRUE, IF-FALSE)
 # -----------------------------
 # Expand IF-TRUE, if FLAG is true, IF-FALSE otherwise.
-b4_define_flag_if([defines])	        # Whether headers are requested.
-b4_define_flag_if([error_verbose])	# Whether error are verbose.
-b4_define_flag_if([glr])		# Whether a GLR parser is requested.
-b4_define_flag_if([locations])	        # Whether locations are tracked.
-b4_define_flag_if([nondeterministic])	# Whether conflicts should be handled.
-b4_define_flag_if([yacc])	        # Whether POSIX Yacc is emulated.
+b4_define_flag_if([defines])            # Whether headers are requested.
+b4_define_flag_if([error_verbose])      # Whether error are verbose.
+b4_define_flag_if([glr])                # Whether a GLR parser is requested.
+b4_define_flag_if([locations])          # Whether locations are tracked.
+b4_define_flag_if([nondeterministic])   # Whether conflicts should be handled.
+b4_define_flag_if([token_table])        # Whether yytoken_table is demanded.
+b4_define_flag_if([yacc])               # Whether POSIX Yacc is emulated.

+# yytoken_table is needed to support verbose errors.
+b4_error_verbose_if([m4_define([b4_token_table_flag], [1])])

-## ------------------------- ##
-## Assigning token numbers.  ##
-## ------------------------- ##


 ## ----------- ##
@@ -274,8 +283,8 @@ m4_define([b4_basename],
 # b4_syncline(LINE, FILE)
 # -----------------------
 m4_define([b4_syncline],
-[b4_flag_if([synclines], [
-b4_sync_end([__line__], [b4_basename(m4_quote(__file__))])
+[b4_flag_if([synclines],
+[b4_sync_end([__line__], [b4_basename(m4_quote(__file__))])
 b4_sync_start([$1], [$2])])])

 m4_define([b4_sync_end], [b4_comment([Line $1 of $2])])
@@ -576,3 +585,26 @@ m4_wrap_lifo([
 b4_check_user_names_wrap([[define]], [[variable]])
 b4_check_user_names_wrap([[code]], [[qualifier]])
 ])
+
+
+## ---------------- ##
+## Default values.  ##
+## ---------------- ##
+
+# m4_define_default([b4_lex_param], [])   dnl breaks other skeletons
+m4_define_default([b4_pre_prologue], [])
+m4_define_default([b4_post_prologue], [])
+m4_define_default([b4_epilogue], [])
+m4_define_default([b4_parse_param], [])
+
+# The initial column and line.
+m4_define_default([b4_location_initial_column], [1])
+m4_define_default([b4_location_initial_line],   [1])
+
+# Sanity checks.
+b4_percent_define_ifdef([api.prefix],
+[m4_ifdef([b4_prefix],
+[b4_complain_at(b4_percent_define_get_loc([api.prefix]),
+                [['%s' and '%s' cannot be used together]],
+                [%name-prefix],
+                [%define api.prefix])])])
@@ -29,7 +29,7 @@ b4_percent_define_default([[parser_class_name]], [[parser]])
 # Don't do that so that we remember whether we're using a user
 # request, or the default value.
 #
-# b4_percent_define_default([[location_type]], [[location]])
+# b4_percent_define_default([[api.location.type]], [[location]])

 b4_percent_define_default([[filename_type]], [[std::string]])
 b4_percent_define_default([[namespace]], m4_defn([b4_prefix]))
@@ -174,3 +174,32 @@ m4_define([b4_cc_var_decls],
 ], [$@])])
 m4_define([b4_cc_var_decl],
 	  [    $1;])
+
+
+## ---------##
+## Values.  ##
+## ---------##
+
+# b4_yylloc_default_define
+# ------------------------
+# Define YYLLOC_DEFAULT.
+m4_define([b4_yylloc_default_define],
+[[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
+   If N is 0, then set CURRENT to the empty location which ends
+   the previous symbol: RHS[0] (always defined).  */
+
+# ifndef YYLLOC_DEFAULT
+#  define YYLLOC_DEFAULT(Current, Rhs, N)                               \
+    do                                                                  \
+      if (N)                                                            \
+        {                                                               \
+          (Current).begin  = YYRHSLOC (Rhs, 1).begin;                   \
+          (Current).end    = YYRHSLOC (Rhs, N).end;                     \
+        }                                                               \
+      else                                                              \
+        {                                                               \
+          (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;      \
+        }                                                               \
+    while (/*CONSTCOND*/ false)
+# endif
+]])
@@ -0,0 +1,44 @@
+                                                            -*- Autoconf -*-
+
+# Common code for C-like languages (C, C++, Java, etc.)
+
+# Copyright (C) 2012 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# b4_dollar_dollar_(VALUE, FIELD, DEFAULT-FIELD)
+# ----------------------------------------------
+# If FIELD (or DEFAULT-FIELD) is non-null, return "VALUE.FIELD",
+# otherwise just VALUE.  Be sure to pass "(VALUE)" is VALUE is a
+# pointer.
+m4_define([b4_dollar_dollar_],
+[m4_if([$2], [[]],
+       [m4_ifval([$3], [($1.$3)],
+                 [$1])],
+       [($1.$2)])])
+
+# b4_dollar_pushdef(VALUE-POINTER, DEFAULT-FIELD, LOCATION)
+# b4_dollar_popdef
+# ---------------------------------------------------------
+# Define b4_dollar_dollar for VALUE and DEFAULT-FIELD,
+# and b4_at_dollar for LOCATION.
+m4_define([b4_dollar_pushdef],
+[m4_pushdef([b4_dollar_dollar],
+            [b4_dollar_dollar_([$1], m4_dquote($][1), [$2])])dnl
+m4_pushdef([b4_at_dollar], [$3])dnl
+])
+m4_define([b4_dollar_popdef],
+[m4_popdef([b4_at_dollar])dnl
+m4_popdef([b4_dollar_dollar])dnl
+])
@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

+m4_include(b4_pkgdatadir/[c-like.m4])

 # b4_tocpp(STRING)
 # ----------------
@@ -29,19 +30,21 @@ m4_define([b4_tocpp],
 # ------------------
 # A valid C macro name to use as a CPP header guard for FILE.
 m4_define([b4_cpp_guard],
-[b4_tocpp(m4_defn([b4_prefix])/[$1])])
+[[YY_]b4_tocpp(m4_defn([b4_prefix])/[$1])[_INCLUDED]])


 # b4_cpp_guard_open(FILE)
 # b4_cpp_guard_close(FILE)
 # ------------------------
-# Open/close CPP inclusion guards for FILE.
+# If FILE does not expand to nothing, open/close CPP inclusion guards for FILE.
 m4_define([b4_cpp_guard_open],
+[m4_ifval(m4_quote($1),
 [#ifndef b4_cpp_guard([$1])
-# define b4_cpp_guard([$1])])
+# define b4_cpp_guard([$1])])])

 m4_define([b4_cpp_guard_close],
-[#endif b4_comment([!b4_cpp_guard([$1])])])
+[m4_ifval(m4_quote($1),
+[#endif b4_comment([!b4_cpp_guard([$1])])])])


 ## ---------------- ##
@@ -77,9 +80,6 @@ m4_define([b4_identification],

 /* Pull parsers.  */
 #define YYPULL ]b4_pull_flag])[
-
-/* Using locations.  */
-#define YYLSP_NEEDED ]b4_locations_flag[
 ]])


@@ -87,11 +87,24 @@ m4_define([b4_identification],
 ## Default values.  ##
 ## ---------------- ##

-# If the %union is not named, its name is YYSTYPE.
-m4_define_default([b4_union_name], [YYSTYPE])
+# b4_api_prefix, b4_api_PREFIX
+# ----------------------------
+# Corresponds to %define api.prefix
+b4_percent_define_default([[api.prefix]], [[yy]])
+m4_define([b4_api_prefix],
+[b4_percent_define_get([[api.prefix]])])
+m4_define([b4_api_PREFIX],
+[m4_toupper(b4_api_prefix)])
+
+
+# b4_prefix
+# ---------
+# If the %name-prefix is not given, it is api.prefix.
+m4_define_default([b4_prefix], [b4_api_prefix])
+
+# If the %union is not named, its name is YYSTYPE.
+m4_define_default([b4_union_name], [b4_api_PREFIX[]STYPE])

-# If the %name-prefix is not given, it is yy.
-m4_define_default([b4_prefix], [yy])

 ## ------------------------ ##
 ## Pure/impure interfaces.  ##
@@ -150,7 +163,7 @@ m4_define([b4_int_type],

       m4_eval([0 <= $1]),                [1], [unsigned int],

-					       [int])])
+                                               [int])])


 # b4_int_type_for(NAME)
@@ -171,7 +184,7 @@ m4_define([b4_table_value_equals],
 [m4_if(m4_eval($3 < m4_indir([b4_]$1[_min])
               || m4_indir([b4_]$1[_max]) < $3), [1],
       [[YYID (0)]],
-       [[((]$2[) == (]$3[))]])])
+       [(!!(($2) == ($3)))])])


 ## ---------##
@@ -235,18 +248,18 @@ m4_define([b4_token_enum],
 # Output the definition of the tokens (if there are) as enums.
 m4_define([b4_token_enums],
 [m4_if([$#$1], [1], [],
-[/* Tokens.  */
-#ifndef YYTOKENTYPE
-# define YYTOKENTYPE
+[[/* Tokens.  */
+#ifndef ]b4_api_PREFIX[TOKENTYPE
+# define ]b4_api_PREFIX[TOKENTYPE
   /* Put the tokens into the symbol table, so that GDB and other debuggers
      know about them.  */
-   enum yytokentype {
-m4_map_sep([     b4_token_enum], [,
+   enum ]b4_api_prefix[tokentype {
+]m4_map_sep([     b4_token_enum], [,
 ],
-	   [$@])
+           [$@])[
   };
 #endif
-])])
+]])])


 # b4_token_enums_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
@@ -307,7 +320,7 @@ $1 (b4_c_ansi_formals(m4_shift2($@)))[]dnl
 m4_define([b4_c_ansi_formals],
 [m4_if([$#], [0], [void],
       [$#$1], [1], [void],
-	       [m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])
+               [m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])

 m4_define([b4_c_ansi_formal],
 [$1])
@@ -328,9 +341,9 @@ m4_define([b4_c_knr_formal_name],
 # Output the K&R argument declarations.
 m4_define([b4_c_knr_formal_decls],
 [m4_map_sep([b4_c_knr_formal_decl],
-	    [
+            [
 ],
-	    [$@])])
+            [$@])])

 m4_define([b4_c_knr_formal_decl],
 [    $1;])
@@ -342,9 +355,18 @@ m4_define([b4_c_knr_formal_decl],
 ## ------------------------------------------------------------ ##


+# b4_c_ansi_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
+# ----------------------------------------------------------------
+# Declare the function NAME ANSI C style.
+m4_define([b4_c_ansi_function_decl],
+[$2 $1 (b4_c_ansi_formals(m4_shift2($@)));[]dnl
+])
+
+
+
 # b4_c_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 # -----------------------------------------------------------
-# Declare the function NAME.
+# Declare the function NAME in both K&R and ANSI C.
 m4_define([b4_c_function_decl],
 [#if defined __STDC__ || defined __cplusplus
 b4_c_ansi_function_decl($@)
@@ -354,15 +376,6 @@ $2 $1 ();
 ])


-# b4_c_ansi_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
-# ----------------------------------------------------------------
-# Declare the function NAME.
-m4_define([b4_c_ansi_function_decl],
-[$2 $1 (b4_c_ansi_formals(m4_shift2($@)));[]dnl
-])
-
-
-

 ## --------------------- ##
 ## Calling C functions.  ##
@@ -411,17 +424,18 @@ $2
 #                   SYMBOL-TAG, SYMBOL-NUM,
 #                   SYMBOL-ACTION, SYMBOL-TYPENAME)
 # -------------------------------------------------
+# Issue the code for a symbol action (e.g., %printer).
+#
+# Define b4_dollar_dollar([TYPE-NAME]), and b4_at_dollar, which are
+# invoked where $<TYPE-NAME>$ and @$ were specified by the user.
 m4_define([b4_symbol_actions],
-[m4_pushdef([b4_dollar_dollar],
-   [m4_ifval([$6], [(yyvaluep->$6)], [(*yyvaluep)])])dnl
-m4_pushdef([b4_at_dollar], [(*yylocationp)])dnl
+[b4_dollar_pushdef([(*yyvaluep)], [$6], [(*yylocationp)])dnl
      case $4: /* $3 */
 b4_syncline([$2], [$1])
-	$5;
+        $5;
 b4_syncline([@oline@], [@ofile@])
-	break;
-m4_popdef([b4_at_dollar])dnl
-m4_popdef([b4_dollar_dollar])dnl
+        break;
+b4_dollar_popdef[]dnl
 ])


@@ -457,7 +471,7 @@ b4_parse_param_use[]dnl
    {
 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
      default:
-	break;
+        break;
    }
 }]dnl
 ])
@@ -477,9 +491,9 @@ m4_define_default([b4_yy_symbol_print_generate],
 /*ARGSUSED*/
 ]$1([yy_symbol_value_print],
    [static void],
-	       [[FILE *yyoutput],                       [yyoutput]],
-	       [[int yytype],                           [yytype]],
-	       [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
+               [[FILE *yyoutput],                       [yyoutput]],
+               [[int yytype],                           [yytype]],
+               [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
 b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 {
@@ -500,7 +514,7 @@ b4_parse_param_use[]dnl
    {
 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
 [      default:
-	break;
+        break;
    }
 }

@@ -511,9 +525,9 @@ b4_parse_param_use[]dnl

 ]$1([yy_symbol_print],
    [static void],
-	       [[FILE *yyoutput],                       [yyoutput]],
-	       [[int yytype],                           [yytype]],
-	       [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
+               [[FILE *yyoutput],                       [yyoutput]],
+               [[int yytype],                           [yytype]],
+               [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
 b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 {
@@ -530,3 +544,171 @@ b4_locations_if([, yylocationp])[]b4_user_args[);
  YYFPRINTF (yyoutput, ")");
 }]dnl
 ])
+
+## -------------- ##
+## Declarations.  ##
+## -------------- ##
+
+# b4_declare_yylstype
+# -------------------
+# Declarations that might either go into the header (if --defines) or
+# in the parser body.  Declare YYSTYPE/YYLTYPE, and yylval/yylloc.
+m4_define([b4_declare_yylstype],
+[[#if ! defined ]b4_api_PREFIX[STYPE && ! defined ]b4_api_PREFIX[STYPE_IS_DECLARED
+]m4_ifdef([b4_stype],
+[[typedef union ]b4_union_name[
+{
+]b4_user_stype[
+} ]b4_api_PREFIX[STYPE;
+# define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]],
+[m4_if(b4_tag_seen_flag, 0,
+[[typedef int ]b4_api_PREFIX[STYPE;
+# define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]])])[
+# define ]b4_api_prefix[stype ]b4_api_PREFIX[STYPE /* obsolescent; will be withdrawn */
+# define ]b4_api_PREFIX[STYPE_IS_DECLARED 1
+#endif]b4_locations_if([[
+
+#if ! defined ]b4_api_PREFIX[LTYPE && ! defined ]b4_api_PREFIX[LTYPE_IS_DECLARED
+typedef struct ]b4_api_PREFIX[LTYPE
+{
+  int first_line;
+  int first_column;
+  int last_line;
+  int last_column;
+} ]b4_api_PREFIX[LTYPE;
+# define ]b4_api_prefix[ltype ]b4_api_PREFIX[LTYPE /* obsolescent; will be withdrawn */
+# define ]b4_api_PREFIX[LTYPE_IS_DECLARED 1
+# define ]b4_api_PREFIX[LTYPE_IS_TRIVIAL 1
+#endif]])
+
+b4_pure_if([], [[extern ]b4_api_PREFIX[STYPE ]b4_prefix[lval;
+]b4_locations_if([[extern ]b4_api_PREFIX[LTYPE ]b4_prefix[lloc;]])])[]dnl
+])
+
+# b4_YYDEBUG_define
+# ------------------
+m4_define([b4_YYDEBUG_define],
+[[/* Enabling traces.  */
+]m4_if(b4_api_prefix, [yy],
+[[#ifndef YYDEBUG
+# define YYDEBUG ]b4_debug_flag[
+#endif]],
+[[#ifndef ]b4_api_PREFIX[DEBUG
+# if defined YYDEBUG
+#  if YYDEBUG
+#   define ]b4_api_PREFIX[DEBUG 1
+#  else
+#   define ]b4_api_PREFIX[DEBUG 0
+#  endif
+# else /* ! defined YYDEBUG */
+#  define ]b4_api_PREFIX[DEBUG ]b4_debug_flag[
+# endif /* ! defined YYDEBUG */
+#endif  /* ! defined ]b4_api_PREFIX[DEBUG */]])[]dnl
+])
+
+# b4_declare_yydebug
+# ------------------
+m4_define([b4_declare_yydebug],
+[b4_YYDEBUG_define[
+#if ]b4_api_PREFIX[DEBUG
+extern int ]b4_prefix[debug;
+#endif][]dnl
+])
+
+# b4_yylloc_default_define
+# ------------------------
+# Define YYLLOC_DEFAULT.
+m4_define([b4_yylloc_default_define],
+[[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
+   If N is 0, then set CURRENT to the empty location which ends
+   the previous symbol: RHS[0] (always defined).  */
+
+#ifndef YYLLOC_DEFAULT
+# define YYLLOC_DEFAULT(Current, Rhs, N)                                \
+    do                                                                  \
+      if (YYID (N))                                                     \
+        {                                                               \
+          (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;        \
+          (Current).first_column = YYRHSLOC (Rhs, 1).first_column;      \
+          (Current).last_line    = YYRHSLOC (Rhs, N).last_line;         \
+          (Current).last_column  = YYRHSLOC (Rhs, N).last_column;       \
+        }                                                               \
+      else                                                              \
+        {                                                               \
+          (Current).first_line   = (Current).last_line   =              \
+            YYRHSLOC (Rhs, 0).last_line;                                \
+          (Current).first_column = (Current).last_column =              \
+            YYRHSLOC (Rhs, 0).last_column;                              \
+        }                                                               \
+    while (YYID (0))
+#endif
+]])
+
+# b4_yy_location_print_define
+# ---------------------------
+# Define YY_LOCATION_PRINT.
+m4_define([b4_yy_location_print_define],
+[b4_locations_if([[
+/* YY_LOCATION_PRINT -- Print the location on the stream.
+   This macro was not mandated originally: define only if we know
+   we won't break user code: when these are the locations we know.  */
+
+#ifndef YY_LOCATION_PRINT
+# if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
+
+/* Print *YYLOCP on YYO.  Private, do not rely on its existence. */
+
+__attribute__((__unused__))
+]b4_c_function_def([yy_location_print_],
+    [static unsigned],
+               [[FILE *yyo],                    [yyo]],
+               [[YYLTYPE const * const yylocp], [yylocp]])[
+{
+  unsigned res = 0;
+  int end_col = 0 != yylocp->last_column ? yylocp->last_column - 1 : 0;
+  if (0 <= yylocp->first_line)
+    {
+      res += fprintf (yyo, "%d", yylocp->first_line);
+      if (0 <= yylocp->first_column)
+        res += fprintf (yyo, ".%d", yylocp->first_column);
+    }
+  if (0 <= yylocp->last_line)
+    {
+      if (yylocp->first_line < yylocp->last_line)
+        {
+          res += fprintf (yyo, "-%d", yylocp->last_line);
+          if (0 <= end_col)
+            res += fprintf (yyo, ".%d", end_col);
+        }
+      else if (0 <= end_col && yylocp->first_column < end_col)
+        res += fprintf (yyo, "-%d", end_col);
+    }
+  return res;
+ }
+
+#  define YY_LOCATION_PRINT(File, Loc)          \
+  yy_location_print_ (File, &(Loc))
+
+# else
+#  define YY_LOCATION_PRINT(File, Loc) ((void) 0)
+# endif
+#endif]],
+[[/* This macro is provided for backward compatibility. */
+#ifndef YY_LOCATION_PRINT
+# define YY_LOCATION_PRINT(File, Loc) ((void) 0)
+#endif]])
+])
+
+# b4_yyloc_default
+# ----------------
+# Expand to a possible default value for yylloc.
+m4_define([b4_yyloc_default],
+[[
+# if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
+  = { ]m4_join([, ],
+               m4_defn([b4_location_initial_line]),
+               m4_defn([b4_location_initial_column]),
+               m4_defn([b4_location_initial_line]),
+               m4_defn([b4_location_initial_column]))[ }
+# endif
+]])
@@ -18,7 +18,10 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.


-m4_include(b4_pkgdatadir/[c.m4])
+# If we are loaded by glr.cc, do not override c++.m4 definitions by
+# those of c.m4.
+m4_if(b4_skeleton, ["glr.c"],
+      [m4_include(b4_pkgdatadir/[c.m4])])

 ## ---------------- ##
 ## Default values.  ##
@@ -154,82 +157,59 @@ m4_define([b4_rhs_location],
 [(((yyGLRStackItem const *)yyvsp)@{YYFILL (($2) - ($1))@}.yystate.yyloc)])


+## -------------- ##
+## Declarations.  ##
+## -------------- ##
+
+# b4_shared_declarations
+# ----------------------
+# Declaration that might either go into the header (if --defines)
+# or open coded in the parser body.
+m4_define([b4_shared_declarations],
+[b4_declare_yydebug[
+]b4_percent_code_get([[requires]])[
+]b4_token_enums(b4_tokens)[
+]b4_declare_yylstype[
+]b4_c_ansi_function_decl(b4_prefix[parse], [int], b4_parse_param)[
+]b4_percent_code_get([[provides]])[]dnl
+])
+

 ## -------------- ##
 ## Output files.  ##
 ## -------------- ##

-# We do want M4 expansion after # for CPP macros.
-m4_changecom()
-m4_divert_push(0)dnl
-@output(b4_parser_file_name@)@
+b4_output_begin([b4_parser_file_name])
 b4_copyright([Skeleton implementation for Bison GLR parsers in C],
-             [2002-2012])
-[
+             [2002-2012])[
+
 /* C GLR parser skeleton written by Paul Hilfinger.  */

 ]b4_identification

-b4_percent_code_get([[top]])[]dnl
-m4_if(b4_prefix, [yy], [],
-[/* Substitute the variable and function names.  */
-#define yyparse b4_prefix[]parse
-#define yylex   b4_prefix[]lex
-#define yyerror b4_prefix[]error
-#define yylval  b4_prefix[]lval
-#define yychar  b4_prefix[]char
-#define yydebug b4_prefix[]debug
-#define yynerrs b4_prefix[]nerrs
-#define yylloc  b4_prefix[]lloc])[
+b4_percent_code_get([[top]])[
+]m4_if(b4_api_prefix, [yy], [],
+[[/* Substitute the type names.  */
+#define YYSTYPE ]b4_api_PREFIX[STYPE]b4_locations_if([[
+#define YYLTYPE ]b4_api_PREFIX[LTYPE]])])[
+]m4_if(b4_prefix, [yy], [],
+[[/* Substitute the variable and function names.  */
+#define yyparse ]b4_prefix[parse
+#define yylex   ]b4_prefix[lex
+#define yyerror ]b4_prefix[error
+#define yylval  ]b4_prefix[lval
+#define yychar  ]b4_prefix[char
+#define yydebug ]b4_prefix[debug
+#define yynerrs ]b4_prefix[nerrs]b4_locations_if([[
+#define yylloc  ]b4_prefix[lloc]])])[

 /* Copy the first part of user declarations.  */
-]b4_user_pre_prologue
+]b4_user_pre_prologue[

-b4_null_define
+]b4_null_define[

-dnl # b4_shared_declarations
-dnl # ----------------------
-dnl # Declaration that might either go into the header (if --defines)
-dnl # or open coded in the parser body.
-m4_define([b4_shared_declarations],
-[b4_percent_code_get([[requires]])[]dnl
-
-b4_token_enums(b4_tokens)
-
-[#ifndef YYSTYPE
-]m4_ifdef([b4_stype],
-[[typedef union ]b4_union_name[
-{
-]b4_user_stype[
-} YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1]],
-[m4_if(b4_tag_seen_flag, 0,
-[[typedef int YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1]])])[
-#endif
-]b4_locations_if([[
-#if ! defined YYLTYPE && ! defined YYLTYPE_IS_DECLARED
-typedef struct YYLTYPE
-{
-  int first_line;
-  int first_column;
-  int last_line;
-  int last_column;
-} YYLTYPE;
-# define YYLTYPE_IS_DECLARED 1
-# define YYLTYPE_IS_TRIVIAL 1
-#endif
-]])[
-]b4_percent_code_get([[provides]])[]dnl
-])
-
-b4_defines_if([[#include "@basename(]b4_spec_defines_file[@)"]],
-              [b4_shared_declarations])[
-
-/* Enabling traces.  */
-#ifndef YYDEBUG
-# define YYDEBUG ]b4_debug_flag[
-#endif
+]b4_defines_if([[#include "@basename(]b4_spec_defines_file[@)"]],
+               [b4_shared_declarations])[

 /* Enabling verbose error messages.  */
 #ifdef YYERROR_VERBOSE
@@ -239,17 +219,12 @@ b4_defines_if([[#include "@basename(]b4_spec_defines_file[@)"]],
 # define YYERROR_VERBOSE ]b4_error_verbose_flag[
 #endif

-/* Enabling the token table.  */
-#ifndef YYTOKEN_TABLE
-# define YYTOKEN_TABLE ]b4_token_table[
-#endif
-
 /* Default (constant) value used for initialization for null
-   right-hand sides.  Unlike the standard yacc.c template,
-   here we set the default value of $$ to a zeroed-out value.
-   Since the default value is undefined, this behavior is
-   technically correct.  */
-static YYSTYPE yyval_default;
+   right-hand sides.  Unlike the standard yacc.c template, here we set
+   the default value of $$ to a zeroed-out value.  Since the default
+   value is undefined, this behavior is technically correct.  */
+static YYSTYPE yyval_default;]b4_locations_if([[
+static YYLTYPE yyloc_default][]b4_yyloc_default;])[

 /* Copy the second part of user declarations.  */
 ]b4_user_post_prologue
@@ -263,24 +238,24 @@ b4_percent_code_get[]dnl
 # if defined YYENABLE_NLS && YYENABLE_NLS
 #  if ENABLE_NLS
 #   include <libintl.h> /* INFRINGES ON USER NAME SPACE */
-#   define YY_(msgid) dgettext ("bison-runtime", msgid)
+#   define YY_(Msgid) dgettext ("bison-runtime", Msgid)
 #  endif
 # endif
 # ifndef YY_
-#  define YY_(msgid) msgid
+#  define YY_(Msgid) Msgid
 # endif
 #endif

 /* Suppress unused-variable warnings by "using" E.  */
 #if ! defined lint || defined __GNUC__
-# define YYUSE(e) ((void) (e))
+# define YYUSE(E) ((void) (E))
 #else
-# define YYUSE(e) /* empty */
+# define YYUSE(E) /* empty */
 #endif

 /* Identity function, used to suppress warnings about constant conditions.  */
 #ifndef lint
-# define YYID(n) (n)
+# define YYID(N) (N)
 #else
 ]b4_c_function_def([YYID], [static int], [[int i], [i]])[
 {
@@ -311,8 +286,9 @@ b4_percent_code_get[]dnl
 #ifndef YYSETJMP
 # include <setjmp.h>
 # define YYJMP_BUF jmp_buf
-# define YYSETJMP(env) setjmp (env)
-# define YYLONGJMP(env, val) longjmp (env, val)
+# define YYSETJMP(Env) setjmp (Env)
+// Pacify clang.
+# define YYLONGJMP(Env, Val) (longjmp (Env, Val), YYASSERT (0))
 #endif

 /*-----------------.
@@ -327,15 +303,8 @@ b4_percent_code_get[]dnl
 # endif
 #endif

-]b4_locations_if([#define YYOPTIONAL_LOC(Name) Name],[
-#ifdef __cplusplus
-# define YYOPTIONAL_LOC(Name) /* empty */
-#else
-# define YYOPTIONAL_LOC(Name) Name __attribute__ ((__unused__))
-#endif])[
-
 #ifndef YYASSERT
-# define YYASSERT(condition) ((void) ((condition) || (abort (), 0)))
+# define YYASSERT(Condition) ((void) ((Condition) || (abort (), 0)))
 #endif

 /* YYFINAL -- State number of the termination state.  */
@@ -370,7 +339,7 @@ static const ]b4_int_type_for([b4_translate])[ yytranslate[] =
  ]b4_translate[
 };

-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
 /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
   YYRHS.  */
 static const ]b4_int_type_for([b4_prhs])[ yyprhs[] =
@@ -391,7 +360,7 @@ static const ]b4_int_type_for([b4_rline])[ yyrline[] =
 };
 #endif

-#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
+#if ]b4_api_PREFIX[DEBUG || YYERROR_VERBOSE || ]b4_token_table_flag[
 /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
   First, the terminals, then, starting at YYNTOKENS, nonterminals.  */
 static const char *const yytname[] =
@@ -492,57 +461,14 @@ static const ]b4_int_type_for([b4_stos])[ yystos[] =
  ]b4_stos[
 };

-
-/* Prevent warning if -Wmissing-prototypes.  */
-]b4_c_ansi_function_decl([yyparse], [int], b4_parse_param)[
-
 /* Error token number */
 #define YYTERROR 1

-/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
-   If N is 0, then set CURRENT to the empty location which ends
-   the previous symbol: RHS[0] (always defined).  */
-
 ]b4_locations_if([[
-#define YYRHSLOC(Rhs, K) ((Rhs)[K].yystate.yyloc)
-#ifndef YYLLOC_DEFAULT
-# define YYLLOC_DEFAULT(Current, Rhs, N)                                \
-    do                                                                  \
-      if (YYID (N))                                                     \
-        {                                                               \
-          (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;        \
-          (Current).first_column = YYRHSLOC (Rhs, 1).first_column;      \
-          (Current).last_line    = YYRHSLOC (Rhs, N).last_line;         \
-          (Current).last_column  = YYRHSLOC (Rhs, N).last_column;       \
-        }                                                               \
-      else                                                              \
-        {                                                               \
-          (Current).first_line   = (Current).last_line   =              \
-            YYRHSLOC (Rhs, 0).last_line;                                \
-          (Current).first_column = (Current).last_column =              \
-            YYRHSLOC (Rhs, 0).last_column;                              \
-        }                                                               \
-    while (YYID (0))
-
-/* YY_LOCATION_PRINT -- Print the location on the stream.
-   This macro was not mandated originally: define only if we know
-   we won't break user code: when these are the locations we know.  */
-
-# define YY_LOCATION_PRINT(File, Loc)                   \
-    fprintf (File, "%d.%d-%d.%d",                       \
-             (Loc).first_line, (Loc).first_column,      \
-             (Loc).last_line,  (Loc).last_column)
-#endif
-]],[
-#ifndef YYLLOC_DEFAULT
-# define YYLLOC_DEFAULT(Current, Rhs, N) ((void) 0)
-#endif
-])[
-
-#ifndef YY_LOCATION_PRINT
-# define YY_LOCATION_PRINT(File, Loc) ((void) 0)
-#endif
-
+]b4_yylloc_default_define[
+# define YYRHSLOC(Rhs, K) ((Rhs)[K].yystate.yyloc)
+]])[
+]b4_yy_location_print_define[

 /* YYLEX -- calling `yylex' with the right arguments.  */
 #define YYLEX ]b4_c_function_call([yylex], [int], b4_lex_param)[
@@ -577,7 +503,7 @@ typedef enum { yyok, yyaccept, yyabort, yyerr } YYRESULTTAG;
   do { YYRESULTTAG yyflag = YYE; if (yyflag != yyok) return yyflag; }       \
   while (YYID (0))

-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG

 # ifndef YYFPRINTF
 #  define YYFPRINTF fprintf
@@ -605,12 +531,12 @@ do {                                                            \
   multiple parsers can coexist.  */
 int yydebug;

-#else /* !YYDEBUG */
+#else /* !]b4_api_PREFIX[DEBUG */

 # define YYDPRINTF(Args)
 # define YY_SYMBOL_PRINT(Title, Type, Value, Location)

-#endif /* !YYDEBUG */
+#endif /* !]b4_api_PREFIX[DEBUG */

 /* YYINITDEPTH -- initial size of the parser's stacks.  */
 #ifndef YYINITDEPTH
@@ -637,8 +563,8 @@ int yydebug;

 #ifndef YYSTACKEXPANDABLE
 # if (! defined __cplusplus \
-      || (]b4_locations_if([[defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL \
-          && ]])[defined YYSTYPE_IS_TRIVIAL && YYSTYPE_IS_TRIVIAL))
+      || (]b4_locations_if([[defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL \
+          && ]])[defined ]b4_api_PREFIX[STYPE_IS_TRIVIAL && ]b4_api_PREFIX[STYPE_IS_TRIVIAL))
 #  define YYSTACKEXPANDABLE 1
 # else
 #  define YYSTACKEXPANDABLE 0
@@ -849,7 +775,7 @@ yyMemoryExhausted (yyGLRStack* yystackp)
  YYLONGJMP (yystackp->yyexception_buffer, 2);
 }

-#if YYDEBUG || YYERROR_VERBOSE
+#if ]b4_api_PREFIX[DEBUG || YYERROR_VERBOSE
 /** A printable representation of TOKEN.  */
 static inline const char*
 yytokenName (yySymbol yytoken)
@@ -986,7 +912,7 @@ yydestroyGLRState (char const *yymsg, yyGLRState *yys]b4_user_formals[)
                &yys->yysemantics.yysval]b4_locuser_args([&yys->yyloc])[);
  else
    {
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
      if (yydebug)
        {
          if (yys->yysemantics.yyfirstVal)
@@ -1019,8 +945,8 @@ yylhsNonterm (yyRuleNum yyrule)
  return yyr1[yyrule];
 }

-#define yypact_value_is_default(yystate) \
-  ]b4_table_value_equals([[pact]], [[yystate]], [b4_pact_ninf])[
+#define yypact_value_is_default(Yystate) \
+  ]b4_table_value_equals([[pact]], [[Yystate]], [b4_pact_ninf])[

 /** True iff LR state STATE has only a default reduction (regardless
 *  of token).  */
@@ -1037,8 +963,8 @@ yydefaultAction (yyStateNum yystate)
  return yydefact[yystate];
 }

-#define yytable_value_is_error(yytable_value) \
-  ]b4_table_value_equals([[table]], [[yytable_value]], [b4_table_ninf])[
+#define yytable_value_is_error(Yytable_value) \
+  ]b4_table_value_equals([[table]], [[Yytable_value]], [b4_table_ninf])[

 /** Set *YYACTION to the action to take in YYSTATE on seeing YYTOKEN.
 *  Result R means
@@ -1415,7 +1341,7 @@ yydoAction (yyGLRStack* yystackp, size_t yyk, yyRuleNum yyrule,
    }
 }

-#if !YYDEBUG
+#if !]b4_api_PREFIX[DEBUG
 # define YY_REDUCE_PRINT(Args)
 #else
 # define YY_REDUCE_PRINT(Args)          \
@@ -1736,7 +1662,7 @@ yyresolveAction (yySemanticOption* yyopt, yyGLRStack* yystackp,
  return yyflag;
 }

-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
 static void
 yyreportTree (yySemanticOption* yyx, int yyindent)
 {
@@ -1791,7 +1717,7 @@ yyreportAmbiguity (yySemanticOption* yyx0,
  YYUSE (yyx0);
  YYUSE (yyx1);

-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
  YYFPRINTF (stderr, "Ambiguity detected.\n");
  YYFPRINTF (stderr, "Option 1,\n");
  yyreportTree (yyx0, 2);
@@ -2341,20 +2267,13 @@ yyrecoverSyntaxError (yyGLRStack* yystackp]b4_user_formals[)
  YYDPRINTF ((stderr, "Starting parse\n"));

  yychar = YYEMPTY;
-  yylval = yyval_default;
-]b4_locations_if([
-#if defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL
-  yylloc.first_line   = yylloc.last_line   = ]b4_location_initial_line[;
-  yylloc.first_column = yylloc.last_column = ]b4_location_initial_column[;
-#endif
-])
-m4_ifdef([b4_initial_action], [
-m4_pushdef([b4_at_dollar],     [yylloc])dnl
-m4_pushdef([b4_dollar_dollar], [yylval])dnl
-  /* User initialization code.  */
-  b4_user_initial_action
-m4_popdef([b4_dollar_dollar])dnl
-m4_popdef([b4_at_dollar])])dnl
+  yylval = yyval_default;]b4_locations_if([
+  yylloc = yyloc_default;])[
+]m4_ifdef([b4_initial_action], [
+b4_dollar_pushdef([yylval], [], [yylloc])dnl
+/* User initialization code.  */
+b4_user_initial_action
+b4_dollar_popdef])[]dnl
 [
  if (! yyinitGLRStack (yystackp, YYINITDEPTH))
    goto yyexhaustedlab;
@@ -2575,7 +2494,7 @@ m4_popdef([b4_at_dollar])])dnl
 }

 /* DEBUGGING ONLY */
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
 static void yypstack (yyGLRStack* yystackp, size_t yyk)
  __attribute__ ((__unused__));
 static void yypdumpstack (yyGLRStack* yystackp) __attribute__ ((__unused__));
@@ -2648,25 +2567,18 @@ yypdumpstack (yyGLRStack* yystackp)
  YYFPRINTF (stderr, "\n");
 }
 #endif
-]
+]b4_epilogue[]dnl
+b4_output_end()

-b4_epilogue
-dnl
-dnl glr.cc produces its own header.
-dnl
+# glr.cc produces its own header.
 m4_if(b4_skeleton, ["glr.c"],
 [b4_defines_if(
-[@output(b4_spec_defines_file@)@
+[b4_output_begin([b4_spec_defines_file])
 b4_copyright([Skeleton interface for Bison GLR parsers in C],
-             [2002-2012])
+             [2002-2012])[

-b4_shared_declarations
-
-b4_pure_if([],
-[[extern YYSTYPE ]b4_prefix[lval;]])
-
-b4_locations_if([b4_pure_if([],
-[extern YYLTYPE ]b4_prefix[lloc;])
-])
+]b4_cpp_guard_open([b4_spec_defines_file])[
+]b4_shared_declarations[
+]b4_cpp_guard_close([b4_spec_defines_file])[
+]b4_output_end()
 ])])
-m4_divert_pop(0)
@@ -54,7 +54,7 @@ b4_defines_if([],
              [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])

 m4_include(b4_pkgdatadir/[c++.m4])
-b4_percent_define_ifdef([[location_type]], [],
+b4_percent_define_ifdef([[api.location.type]], [],
                        [m4_include(b4_pkgdatadir/[location.cc])])

 m4_define([b4_parser_class_name],
@@ -78,31 +78,39 @@ m4_define([b4_yy_symbol_print_generate],
    [static void],
    [[FILE *],               []],
    [[int yytype],           [yytype]],
-    [[const b4_namespace_ref::b4_parser_class_name::semantic_type *yyvaluep],
+    [[const ]b4_namespace_ref::b4_parser_class_name[::semantic_type *yyvaluep],
                             [yyvaluep]],
-    [[const b4_namespace_ref::b4_parser_class_name::location_type *yylocationp],
+    [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
                             [yylocationp]],
    b4_parse_param)[
 {
 ]b4_parse_param_use[]dnl
 [  yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[);
 }
-]])
+]])[

+# Hijack the initial action to initialize the locations.
+]b4_locations_if([b4_percent_define_ifdef([[api.location.type]], [],
+[m4_define([b4_initial_action],
+[yylloc.initialize ();]m4_ifdef([b4_initial_action], [
+m4_defn([b4_initial_action])]))])])[

-# Declare yyerror.
-m4_append([b4_post_prologue],
-[b4_syncline([@oline@], [@ofile@])
-
-b4_c_ansi_function_decl([yyerror],
+# Hijack the post prologue to insert early definition of YYLLOC_DEFAULT
+# and declaration of yyerror.
+]m4_append([b4_post_prologue],
+[b4_syncline([@oline@], [@ofile@])[
+]b4_yylloc_default_define[
+#define YYRHSLOC(Rhs, K) ((Rhs)[K].yystate.yyloc)
+]b4_c_ansi_function_decl([yyerror],
    [static void],
-    [[const b4_namespace_ref::b4_parser_class_name::location_type *yylocationp],
+    [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
                        [yylocationp]],
    b4_parse_param,
    [[const char* msg], [msg]])])


-# Define yyerror.
+# Hijack the epilogue to define implementations (yyerror, parser member
+# functions etc.).
 m4_append([b4_epilogue],
 [b4_syncline([@oline@], [@ofile@])[
 /*------------------.
@@ -111,7 +119,7 @@ m4_append([b4_epilogue],

 ]b4_c_ansi_function_def([yyerror],
    [static void],
-    [[const b4_namespace_ref::b4_parser_class_name::location_type *yylocationp],
+    [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
                        [yylocationp]],
    b4_parse_param,
    [[const char* msg], [msg]])[
@@ -127,8 +135,8 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
 [  /// Build a parser object.
  ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
    :])[
-#if YYDEBUG
-    ]m4_ifset([b4_parse_param], [  ], [ :])[yydebug_ (false),
+#if ]b4_api_PREFIX[DEBUG
+    ]m4_ifset([b4_parse_param], [  ], [ :])[
      yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
 #endif]b4_parse_param_cons[
  {
@@ -144,7 +152,7 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
    return ::yyparse (*this]b4_user_args[);
  }

-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
  /*--------------------.
  | Print this symbol.  |
  `--------------------*/
@@ -196,76 +204,48 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
  ]b4_parser_class_name[::debug_level_type
  ]b4_parser_class_name[::debug_level () const
  {
-    return yydebug_;
+    return yydebug;
  }

  void
  ]b4_parser_class_name[::set_debug_level (debug_level_type l)
  {
-    yydebug_ = l;
+    // Actually, it is yydebug which is really used.
+    yydebug = l;
  }

 #endif
 ]m4_popdef([b4_parse_param])dnl
-b4_namespace_close[
-
-]])
+b4_namespace_close])


 # Let glr.c believe that the user arguments include the parser itself.
 m4_ifset([b4_parse_param],
 [m4_pushdef([b4_parse_param],
-            m4_dquote([[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yyparser]]],]
-m4_defn([b4_parse_param])))],
+            [[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]],]
+m4_defn([b4_parse_param]))],
 [m4_pushdef([b4_parse_param],
-            [[[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yyparser]]]]])
+            [[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]]])
 ])
 m4_include(b4_pkgdatadir/[glr.c])
 m4_popdef([b4_parse_param])

-m4_divert_push(0)
-@output(b4_spec_defines_file@)@
+b4_output_begin([b4_spec_defines_file])
 b4_copyright([Skeleton interface for Bison GLR parsers in C++],
             [2002-2006, 2009-2012])[

 /* C++ GLR parser skeleton written by Akim Demaille.  */

-#ifndef PARSER_HEADER_H
-# define PARSER_HEADER_H
+]b4_cpp_guard_open([b4_spec_defines_file])[

 ]b4_percent_code_get([[requires]])[

-#include <string>
-#include <iostream>
-]b4_percent_define_ifdef([[location_type]], [],
-                         [[#include "location.hh"]])[
+# include <string>
+# include <iostream>
+]b4_percent_define_ifdef([[api.location.type]], [],
+                         [[# include "location.hh"]])[

-/* Using locations.  */
-#define YYLSP_NEEDED ]b4_locations_flag[
-
-/* Enabling traces.  */
-#ifndef YYDEBUG
-# define YYDEBUG ]b4_debug_flag[
-#endif
-
-/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
-   If N is 0, then set CURRENT to the empty location which ends
-   the previous symbol: RHS[0] (always defined).  */
-
-#ifndef YYLLOC_DEFAULT
-# define YYLLOC_DEFAULT(Current, Rhs, N)                                \
-    do                                                                  \
-      if (N)                                                            \
-        {                                                               \
-          (Current).begin  = YYRHSLOC (Rhs, 1).begin;                   \
-          (Current).end    = YYRHSLOC (Rhs, N).end;                     \
-        }                                                               \
-      else                                                              \
-        {                                                               \
-          (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;      \
-        }                                                               \
-    while (/*CONSTCOND*/ 0)
-#endif
+]b4_YYDEBUG_define[

 ]b4_namespace_open[
  /// A Bison parser.
@@ -273,7 +253,7 @@ b4_copyright([Skeleton interface for Bison GLR parsers in C++],
  {
  public:
    /// Symbol semantic values.
-#ifndef YYSTYPE
+# ifndef ]b4_api_PREFIX[STYPE
 ]m4_ifdef([b4_stype],
 [    union semantic_type
    {
@@ -281,12 +261,12 @@ b4_user_stype
    };],
 [m4_if(b4_tag_seen_flag, 0,
 [[    typedef int semantic_type;]],
-[[    typedef YYSTYPE semantic_type;]])])[
-#else
-    typedef YYSTYPE semantic_type;
-#endif
+[[    typedef ]b4_api_PREFIX[STYPE semantic_type;]])])[
+# else
+    typedef ]b4_api_PREFIX[STYPE semantic_type;
+# endif
    /// Symbol locations.
-    typedef ]b4_percent_define_get([[location_type]],
+    typedef ]b4_percent_define_get([[api.location.type]],
                                   [[location]])[ location_type;
    /// Tokens.
    struct token
@@ -325,7 +305,7 @@ b4_user_stype
    virtual void error (const location_type& loc, const std::string& msg);
  private:

-#if YYDEBUG
+# if ]b4_api_PREFIX[DEBUG
  public:
    /// \brief Report a symbol value on the debug stream.
    /// \param yytype       The token type.
@@ -343,9 +323,8 @@ b4_user_stype
                                   const location_type* yylocationp);
  private:
    /* Debugging.  */
-    int yydebug_;
    std::ostream* yycdebug_;
-#endif
+# endif

 ]b4_parse_param_vars[
  };
@@ -354,16 +333,14 @@ b4_user_stype
 b4_percent_define_flag_if([[global_tokens_and_yystype]],
 [b4_token_defines(b4_tokens)])
 [
-#ifndef YYSTYPE
-# define YYSTYPE ]b4_namespace_ref[::]b4_parser_class_name[::semantic_type
+#ifndef ]b4_api_PREFIX[STYPE
+# define ]b4_api_PREFIX[STYPE ]b4_namespace_ref[::]b4_parser_class_name[::semantic_type
 #endif
-#ifndef YYLTYPE
-# define YYLTYPE ]b4_namespace_ref[::]b4_parser_class_name[::location_type
+#ifndef ]b4_api_PREFIX[LTYPE
+# define ]b4_api_PREFIX[LTYPE ]b4_namespace_ref[::]b4_parser_class_name[::location_type
 #endif

 ]b4_namespace_close[
-
-]b4_percent_code_get([[provides]])[]dnl
-
-[#endif /* ! defined PARSER_HEADER_H */]
-m4_divert_pop(0)
+]b4_percent_code_get([[provides]])[
+]b4_cpp_guard_close([b4_spec_defines_file])[
+]b4_output_end()
@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

+m4_include(b4_pkgdatadir/[c-like.m4])

 # b4_comment(TEXT)
 # ----------------
@@ -154,25 +155,25 @@ m4_define([b4_case], [  case $1:
 ## ---------------- ##

 m4_define([b4_yystype], [b4_percent_define_get([[stype]])])
-b4_percent_define_default([[stype]], [[Object]])])
+b4_percent_define_default([[stype]], [[Object]])

 # %name-prefix
 m4_define_default([b4_prefix], [[YY]])

-b4_percent_define_default([[parser_class_name]], [b4_prefix[]Parser])])
+b4_percent_define_default([[parser_class_name]], [b4_prefix[]Parser])
 m4_define([b4_parser_class_name], [b4_percent_define_get([[parser_class_name]])])

-b4_percent_define_default([[lex_throws]], [[java.io.IOException]])])
+b4_percent_define_default([[lex_throws]], [[java.io.IOException]])
 m4_define([b4_lex_throws], [b4_percent_define_get([[lex_throws]])])

-b4_percent_define_default([[throws]], [])])
+b4_percent_define_default([[throws]], [])
 m4_define([b4_throws], [b4_percent_define_get([[throws]])])

-b4_percent_define_default([[location_type]], [Location])])
-m4_define([b4_location_type], [b4_percent_define_get([[location_type]])])
+b4_percent_define_default([[api.location.type]], [Location])
+m4_define([b4_location_type], [b4_percent_define_get([[api.location.type]])])

-b4_percent_define_default([[position_type]], [Position])])
-m4_define([b4_position_type], [b4_percent_define_get([[position_type]])])
+b4_percent_define_default([[api.position.type]], [Position])
+m4_define([b4_position_type], [b4_percent_define_get([[api.position.type]])])


 ## ----------------- ##
@@ -218,9 +219,9 @@ m4_define([b4_rhs_location],
 # it to be single quoted.  Same for b4_parse_param.

 # TODO: should be in bison.m4
-m4_define_default([b4_lex_param], [[]]))
-m4_define([b4_lex_param], b4_lex_param))
-m4_define([b4_parse_param], b4_parse_param))
+m4_define_default([b4_lex_param], [[]])
+m4_define([b4_lex_param], b4_lex_param)
+m4_define([b4_parse_param], b4_parse_param)

 # b4_lex_param_decl
 # -------------------
@@ -24,17 +24,14 @@ m4_define([b4_parser_class_name],
 b4_defines_if([],
              [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])

-b4_percent_define_ifdef([[location_type]], [],
+b4_percent_define_ifdef([[api.location.type]], [],
  [# Backward compatibility.
  m4_define([b4_location_constructors])
  m4_include(b4_pkgdatadir/[location.cc])])
 m4_include(b4_pkgdatadir/[stack.hh])

-# We do want M4 expansion after # for CPP macros.
-m4_changecom()
-m4_divert_push(0)dnl
 b4_defines_if(
-[@output(b4_spec_defines_file@)@
+[b4_output_begin([b4_spec_defines_file])
 b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++],
             [2002-2012])
 [
@@ -52,28 +49,10 @@ b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++],
 #include <string>
 #include <iostream>
 #include "stack.hh"
-]b4_percent_define_ifdef([[location_type]], [],
+]b4_percent_define_ifdef([[api.location.type]], [],
                         [[#include "location.hh"]])[

-]b4_null_define[
-
-/* Enabling traces.  */
-#ifndef YYDEBUG
-# define YYDEBUG ]b4_debug_flag[
-#endif
-
-/* Enabling verbose error messages.  */
-#ifdef YYERROR_VERBOSE
-# undef YYERROR_VERBOSE
-# define YYERROR_VERBOSE 1
-#else
-# define YYERROR_VERBOSE ]b4_error_verbose_flag[
-#endif
-
-/* Enabling the token table.  */
-#ifndef YYTOKEN_TABLE
-# define YYTOKEN_TABLE ]b4_token_table[
-#endif
+]b4_YYDEBUG_define[

 ]b4_namespace_open[

@@ -82,7 +61,7 @@ b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++],
  {
  public:
    /// Symbol semantic values.
-#ifndef YYSTYPE
+#ifndef ]b4_api_PREFIX[STYPE
 ]m4_ifdef([b4_stype],
 [    union semantic_type
    {
@@ -90,12 +69,12 @@ b4_user_stype
    };],
 [m4_if(b4_tag_seen_flag, 0,
 [[    typedef int semantic_type;]],
-[[    typedef YYSTYPE semantic_type;]])])[
+[[    typedef ]b4_api_PREFIX[STYPE semantic_type;]])])[
 #else
-    typedef YYSTYPE semantic_type;
+    typedef ]b4_api_PREFIX[STYPE semantic_type;
 #endif
    /// Symbol locations.
-    typedef ]b4_percent_define_get([[location_type]],
+    typedef ]b4_percent_define_get([[api.location.type]],
                                   [[location]])[ location_type;
    /// Tokens.
    struct token
@@ -113,7 +92,7 @@ b4_user_stype
    /// \returns  0 iff parsing succeeded.
    virtual int parse ();

-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
    /// The current debugging stream.
    std::ostream& debug_stream () const;
    /// Set the current debugging stream.
@@ -138,7 +117,7 @@ b4_user_stype
    /// \param tok     the lookahead token.
    virtual std::string yysyntax_error_ (int yystate, int tok);

-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
    /// \brief Report a symbol value on the debug stream.
    /// \param yytype       The token type.
    /// \param yyvaluep     Its semantic value.
@@ -211,17 +190,15 @@ b4_user_stype
    /// For a rule, its LHS.
    static const ]b4_int_type_for([b4_r1])[ yyr1_[];
    /// For a rule, its RHS length.
-    static const ]b4_int_type_for([b4_r2])[ yyr2_[];
-
-#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
-    /// For a symbol, its name in clear.
-    static const char* const yytname_[];
-#endif]b4_error_verbose_if([
+    static const ]b4_int_type_for([b4_r2])[ yyr2_[]; ]b4_error_verbose_if([

    /// Convert the symbol name \a n to a form suitable for a diagnostic.
    static std::string yytnamerr_ (const char *n);])[

-#if YYDEBUG
+]b4_token_table_if([], [[#if ]b4_api_PREFIX[DEBUG]])[
+    /// For a symbol, its name in clear.
+    static const char* const yytname_[];
+]b4_token_table_if([[#if ]b4_api_PREFIX[DEBUG]])[
    /// A type to store symbol numbers and -1.
    typedef ]b4_int_type_for([b4_rhs])[ rhs_number_type;
    /// A `-1'-separated list of the rules' RHS.
@@ -247,6 +224,7 @@ b4_user_stype

    /// \brief Reclaim the memory associated to a symbol.
    /// \param yymsg        Why this token is reclaimed.
+    ///                     If null, do not display the symbol, just free it.
    /// \param yytype       The symbol type.
    /// \param yyvaluep     Its semantic value.
    /// \param yylocationp  Its location.
@@ -277,15 +255,18 @@ b4_user_stype
 ]b4_percent_define_flag_if([[global_tokens_and_yystype]],
 [b4_token_defines(b4_tokens)

-#ifndef YYSTYPE
+#ifndef ]b4_api_PREFIX[STYPE
 /* Redirection for backward compatibility.  */
-# define YYSTYPE b4_namespace_ref::b4_parser_class_name::semantic_type
+# define ]b4_api_PREFIX[STYPE b4_namespace_ref::b4_parser_class_name::semantic_type
 #endif
 ])[
 ]b4_percent_code_get([[provides]])[
 ]b4_cpp_guard_close([b4_spec_defines_file])
-])dnl
-@output(b4_parser_file_name@)@
+b4_output_end()
+])
+
+
+b4_output_begin([b4_parser_file_name])
 b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++],
             [2002-2012])
 b4_percent_code_get([[top]])[]dnl
@@ -295,16 +276,18 @@ m4_if(b4_prefix, [yy], [],
 #define yylex   b4_prefix[]lex])[

 /* First part of user declarations.  */
-]b4_user_pre_prologue
+]b4_user_pre_prologue[

-b4_defines_if([[
+]b4_defines_if([[
 #include "@basename(]b4_spec_defines_file[@)"]])[

 /* User implementation prologue.  */
-]b4_user_post_prologue
-b4_percent_code_get[]dnl
+]b4_user_post_prologue[
+]b4_percent_code_get[

-[#ifndef YY_
+]b4_null_define[
+
+#ifndef YY_
 # if defined YYENABLE_NLS && YYENABLE_NLS
 #  if ENABLE_NLS
 #   include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */
@@ -316,31 +299,14 @@ b4_percent_code_get[]dnl
 # endif
 #endif

-/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
-   If N is 0, then set CURRENT to the empty location which ends
-   the previous symbol: RHS[0] (always defined).  */
-
 #define YYRHSLOC(Rhs, K) ((Rhs)[K])
-#ifndef YYLLOC_DEFAULT
-# define YYLLOC_DEFAULT(Current, Rhs, N)                               \
- do                                                                    \
-   if (N)                                                              \
-     {                                                                 \
-       (Current).begin = YYRHSLOC (Rhs, 1).begin;                      \
-       (Current).end   = YYRHSLOC (Rhs, N).end;                        \
-     }                                                                 \
-   else                                                                \
-     {                                                                 \
-       (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;        \
-     }                                                                 \
- while (false)
-#endif
+]b4_yylloc_default_define[

 /* Suppress unused-variable warnings by "using" E.  */
 #define YYUSE(e) ((void) (e))

 /* Enable debugging if requested.  */
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG

 /* A pseudo ostream that takes yydebug_ into account.  */
 # define YYCDEBUG if (yydebug_) (*yycdebug_)
@@ -367,14 +333,14 @@ do {					\
    yystack_print_ ();			\
 } while (false)

-#else /* !YYDEBUG */
+#else /* !]b4_api_PREFIX[DEBUG */

 # define YYCDEBUG if (false) std::cerr
-# define YY_SYMBOL_PRINT(Title, Type, Value, Location)
-# define YY_REDUCE_PRINT(Rule)
-# define YY_STACK_PRINT()
+# define YY_SYMBOL_PRINT(Title, Type, Value, Location) YYUSE(Type)
+# define YY_REDUCE_PRINT(Rule)        static_cast<void>(0)
+# define YY_STACK_PRINT()             static_cast<void>(0)

-#endif /* !YYDEBUG */
+#endif /* !]b4_api_PREFIX[DEBUG */

 #define yyerrok		(yyerrstatus_ = 0)
 #define yyclearin	(yychar = yyempty_)
@@ -427,7 +393,7 @@ do {					\
  /// Build a parser object.
  ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
    :])[
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
    ]m4_ifset([b4_parse_param], [  ], [ :])[yydebug_ (false),
      yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
 #endif]b4_parse_param_cons[
@@ -438,7 +404,7 @@ do {					\
  {
  }

-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
  /*--------------------------------.
  | Print this symbol on YYOUTPUT.  |
  `--------------------------------*/
@@ -481,7 +447,8 @@ do {					\
    YYUSE (yymsg);
    YYUSE (yyvaluep);

-    YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
+    if (yymsg)
+      YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);

    switch (yytype)
      {
@@ -499,7 +466,7 @@ do {					\
    yylocation_stack_.pop (n);
  }

-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
  std::ostream&
  ]b4_parser_class_name[::debug_stream () const
  {
@@ -545,17 +512,18 @@ do {					\
    int yychar = yyempty_;
    int yytoken = 0;

-    /* State.  */
+    // State.
    int yyn;
    int yylen = 0;
    int yystate = 0;

-    /* Error handling.  */
+    // Error handling.
    int yynerrs_ = 0;
    int yyerrstatus_ = 0;

    /// Semantic value of the lookahead.
-    semantic_type yylval;
+    static semantic_type yyval_default;
+    semantic_type yylval = yyval_default;
    /// Location of the lookahead.
    location_type yylloc;
    /// The locations where the error started and ended.
@@ -568,15 +536,17 @@ do {					\

    int yyresult;

+    // FIXME: This shoud be completely indented.  It is not yet to
+    // avoid gratuitous conflicts when merging into the master branch.
+    try
+      {
    YYCDEBUG << "Starting parse" << std::endl;

 ]m4_ifdef([b4_initial_action], [
-m4_pushdef([b4_at_dollar],     [yylloc])dnl
-m4_pushdef([b4_dollar_dollar], [yylval])dnl
-    /* User initialization code.  */
-    b4_user_initial_action
-m4_popdef([b4_dollar_dollar])dnl
-m4_popdef([b4_at_dollar])])dnl
+b4_dollar_pushdef([yylval], [], [yylloc])dnl
+/* User initialization code.  */
+b4_user_initial_action
+b4_dollar_popdef])[]dnl

  [  /* Initialize the stacks.  The initial state will be pushed in
       yynewstate, since the latter expects the semantical and the
@@ -610,14 +580,13 @@ m4_popdef([b4_at_dollar])])dnl
    /* Read a lookahead token.  */
    if (yychar == yyempty_)
      {
-	YYCDEBUG << "Reading a token: ";
-	yychar = ]b4_c_function_call([yylex], [int],
-				     [[YYSTYPE*], [&yylval]][]dnl
+        YYCDEBUG << "Reading a token: ";
+        yychar = ]b4_c_function_call([yylex], [int],
+                                     [b4_api_PREFIX[STYPE*], [&yylval]][]dnl
 b4_locations_if([, [[location*], [&yylloc]]])dnl
 m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
      }

-
    /* Convert token to internal form.  */
    if (yychar <= yyeof_)
      {
@@ -688,17 +657,21 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
    else
      yyval = yysemantic_stack_[0];

+    // Compute the default @@$.
    {
      slice<location_type, location_stack_type> slice (yylocation_stack_, yylen);
      YYLLOC_DEFAULT (yyloc, slice, yylen);
    }
+
+    // Perform the reduction.
    YY_REDUCE_PRINT (yyn);
    switch (yyn)
      {
-	]b4_user_actions[
-	default:
-          break;
+        ]b4_user_actions[
+      default:
+        break;
      }
+
    /* User semantic actions sometimes alter yychar, and that requires
       that yytoken be updated with the new translation.  We take the
       approach of translating immediately before every use of yytoken.
@@ -749,20 +722,19 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
    yyerror_range[1] = yylloc;
    if (yyerrstatus_ == 3)
      {
-	/* If just tried and failed to reuse lookahead token after an
-	 error, discard it.  */
-
-	if (yychar <= yyeof_)
-	  {
-	  /* Return failure if at end of input.  */
-	  if (yychar == yyeof_)
-	    YYABORT;
-	  }
-	else
-	  {
-	    yydestruct_ ("Error: discarding", yytoken, &yylval, &yylloc);
-	    yychar = yyempty_;
-	  }
+        /* If just tried and failed to reuse lookahead token after an
+           error, discard it.  */
+        if (yychar <= yyeof_)
+          {
+            /* Return failure if at end of input.  */
+            if (yychar == yyeof_)
+              YYABORT;
+          }
+        else
+          {
+            yydestruct_ ("Error: discarding", yytoken, &yylval, &yylloc);
+            yychar = yyempty_;
+          }
      }

    /* Else will try to reuse lookahead token after shifting the error
@@ -811,7 +783,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;

 	/* Pop the current state because it cannot handle the error token.  */
 	if (yystate_stack_.height () == 1)
-	YYABORT;
+	  YYABORT;

 	yyerror_range[1] = yylocation_stack_[0];
 	yydestruct_ ("Error: popping",
@@ -859,16 +831,42 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
    /* Do not reclaim the symbols of the rule which action triggered
       this YYABORT or YYACCEPT.  */
    yypop_ (yylen);
-    while (yystate_stack_.height () != 1)
+    while (1 < yystate_stack_.height ())
      {
-	yydestruct_ ("Cleanup: popping",
-		   yystos_[yystate_stack_[0]],
-		   &yysemantic_stack_[0],
-		   &yylocation_stack_[0]);
-	yypop_ ();
+        yydestruct_ ("Cleanup: popping",
+                     yystos_[yystate_stack_[0]],
+                     &yysemantic_stack_[0],
+                     &yylocation_stack_[0]);
+        yypop_ ();
      }

    return yyresult;
+    }
+    catch (...)
+      {
+        YYCDEBUG << "Exception caught: cleaning lookahead and stack"
+                 << std::endl;
+        // Do not try to display the values of the reclaimed symbols,
+        // as their printer might throw an exception.
+        if (yychar != yyempty_)
+          {
+            /* Make sure we have latest lookahead translation.  See
+               comments at user semantic actions for why this is
+               necessary.  */
+            yytoken = yytranslate_ (yychar);
+            yydestruct_ (YY_NULL, yytoken, &yylval, &yylloc);
+          }
+
+        while (1 < yystate_stack_.height ())
+          {
+            yydestruct_ (YY_NULL,
+                         yystos_[yystate_stack_[0]],
+                         &yysemantic_stack_[0],
+                         &yylocation_stack_[0]);
+            yypop_ ();
+          }
+        throw;
+      }
  }

  // Generate an error message.
@@ -1027,7 +1025,7 @@ b4_error_verbose_if([int yystate, int yytoken],
    ]b4_stos[
  };

-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
  /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
     to YYLEX-NUM.  */
  const ]b4_int_type_for([b4_toknum])[
@@ -1051,7 +1049,7 @@ b4_error_verbose_if([int yystate, int yytoken],
    ]b4_r2[
  };

-#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
+]b4_token_table_if([], [[#if ]b4_api_PREFIX[DEBUG]])[
  /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
     First, the terminals, then, starting at \a yyntokens_, nonterminals.  */
  const char*
@@ -1059,9 +1057,8 @@ b4_error_verbose_if([int yystate, int yytoken],
  {
    ]b4_tname[
  };
-#endif

-#if YYDEBUG
+]b4_token_table_if([[#if ]b4_api_PREFIX[DEBUG]])[
  /* YYRHS -- A `-1'-separated list of the rules' RHS.  */
  const ]b4_parser_class_name[::rhs_number_type
  ]b4_parser_class_name[::yyrhs_[] =
@@ -1111,7 +1108,7 @@ b4_error_verbose_if([int yystate, int yytoken],
 		       &]b4_rhs_value(yynrhs, yyi + 1)[,
 		       &]b4_rhs_location(yynrhs, yyi + 1)[);
  }
-#endif // YYDEBUG
+#endif // ]b4_api_PREFIX[DEBUG

  /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
  ]b4_parser_class_name[::token_number_type
@@ -1142,5 +1139,5 @@ b4_error_verbose_if([int yystate, int yytoken],
  const ]b4_parser_class_name[::token_number_type ]b4_parser_class_name[::yyundef_token_ = ]b4_undef_token_number[;

 ]b4_namespace_close[
-]b4_epilogue
-m4_divert_pop(0)
+]b4_epilogue[]dnl
+b4_output_end()
@@ -22,8 +22,7 @@ m4_ifval(m4_defn([b4_symbol_destructors]),
        [b4_fatal([%s: %%destructor does not make sense in Java], [b4_skeleton])],
        [])

-m4_divert_push(0)dnl
-@output(b4_parser_file_name@)@
+b4_output_begin([b4_parser_file_name])
 b4_copyright([Skeleton implementation for Bison LALR(1) parsers in Java],
             [2007-2012])

@@ -458,12 +457,10 @@ b4_lexer_if([[
    yyerrstatus_ = 0;

 ]m4_ifdef([b4_initial_action], [
-m4_pushdef([b4_at_dollar],     [yylloc])dnl
-m4_pushdef([b4_dollar_dollar], [yylval])dnl
-    /* User initialization code.  */
-    b4_user_initial_action
-m4_popdef([b4_dollar_dollar])dnl
-m4_popdef([b4_at_dollar])])dnl
+b4_dollar_pushdef([yylval], [], [yylloc])dnl
+/* User initialization code.  */
+b4_user_initial_action
+b4_dollar_popdef])[]dnl

  [  /* Initialize the stack.  */
    yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
@@ -927,4 +924,4 @@ b4_percent_code_get[]dnl
 }

 b4_epilogue
-m4_divert_pop(0)dnl
+b4_output_end()
@@ -15,10 +15,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

-# We do want M4 expansion after # for CPP macros.
-m4_changecom()
-m4_divert_push(0)dnl
-@output(b4_dir_prefix[]position.hh@)@
+
+b4_output_begin([b4_dir_prefix[]position.hh])
 b4_copyright([Positions for Bison parsers in C++],
             [2002-2007, 2009-2012])[

@@ -29,9 +27,9 @@ b4_copyright([Positions for Bison parsers in C++],

 ]b4_cpp_guard_open([b4_dir_prefix[]position.hh])[

+# include <algorithm> // std::max
 # include <iostream>
 # include <string>
-# include <algorithm>

 ]b4_null_define[

@@ -87,7 +85,7 @@ b4_copyright([Positions for Bison parsers in C++],
  };

  /// Add and assign a position.
-  inline const position&
+  inline position&
  operator+= (position& res, const int width)
  {
    res.columns (width);
@@ -103,7 +101,7 @@ b4_copyright([Positions for Bison parsers in C++],
  }

  /// Add and assign a position.
-  inline const position&
+  inline position&
  operator-= (position& res, const int width)
  {
    return res += -width;
@@ -138,8 +136,9 @@ b4_copyright([Positions for Bison parsers in C++],
   ** \param ostr the destination output stream
   ** \param pos a reference to the position to redirect
   */
-  inline std::ostream&
-  operator<< (std::ostream& ostr, const position& pos)
+  template <typename YYChar>
+  inline std::basic_ostream<YYChar>&
+  operator<< (std::basic_ostream<YYChar>& ostr, const position& pos)
  {
    if (pos.filename)
      ostr << *pos.filename << ':';
@@ -148,7 +147,10 @@ b4_copyright([Positions for Bison parsers in C++],

 ]b4_namespace_close[
 ]b4_cpp_guard_close([b4_dir_prefix[]position.hh])
-@output(b4_dir_prefix[]location.hh@)@
+b4_output_end()
+
+
+b4_output_begin([b4_dir_prefix[]location.hh])
 b4_copyright([Locations for Bison parsers in C++],
             [2002-2007, 2009-2012])[

@@ -159,8 +161,6 @@ b4_copyright([Locations for Bison parsers in C++],

 ]b4_cpp_guard_open([b4_dir_prefix[]location.hh])[

-# include <iostream>
-# include <string>
 # include "position.hh"

 ]b4_namespace_open[
@@ -276,7 +276,9 @@ b4_copyright([Locations for Bison parsers in C++],
   **
   ** Avoid duplicate information.
   */
-  inline std::ostream& operator<< (std::ostream& ostr, const location& loc)
+  template <typename YYChar>
+  inline std::basic_ostream<YYChar>&
+  operator<< (std::basic_ostream<YYChar>& ostr, const location& loc)
  {
    position last = loc.end - 1;
    ostr << loc.begin;
@@ -294,5 +296,4 @@ b4_copyright([Locations for Bison parsers in C++],
 ]b4_namespace_close[

 ]b4_cpp_guard_close([b4_dir_prefix[]location.hh])
-m4_divert_pop(0)
-m4_changecom([#])
+b4_output_end()
@@ -18,10 +18,7 @@
 m4_pushdef([b4_copyright_years],
           [2002-2012])

-# We do want M4 expansion after # for CPP macros.
-m4_changecom()
-m4_divert_push(0)dnl
-@output(b4_dir_prefix[]stack.hh@)@
+b4_output_begin([b4_dir_prefix[]stack.hh])
 b4_copyright([Stack handling for Bison parsers in C++],
             [2002-2012])[

@@ -119,6 +116,6 @@ b4_copyright([Stack handling for Bison parsers in C++],
 ]b4_namespace_close[

 ]b4_cpp_guard_close([b4_dir_prefix[]stack.hh])
-m4_divert_pop(0)
-m4_popdef([b4_copyright_years])dnl
-m4_changecom([#])
+b4_output_end()
+
+m4_popdef([b4_copyright_years])
@@ -90,4 +90,16 @@
  <xsl:value-of select="string-length(translate($conflict-data, 's', ''))"/>
 </xsl:template>

+<xsl:template name="space">
+  <xsl:param name="repeat">0</xsl:param>
+  <xsl:param name="fill" select="' '"/>
+  <xsl:if test="number($repeat) &gt;= 1">
+    <xsl:call-template name="space">
+      <xsl:with-param name="repeat" select="$repeat - 1"/>
+      <xsl:with-param name="fill" select="$fill"/>
+    </xsl:call-template>
+    <xsl:value-of select="$fill"/>
+  </xsl:if>
+</xsl:template>
+
 </xsl:stylesheet>
@@ -55,7 +55,11 @@
  <xsl:call-template name="escape">
    <xsl:with-param name="subject" select="$filename"/>
  </xsl:call-template>
-  <xsl:text>"&#10;{&#10;</xsl:text>
+  <xsl:text>"&#10;{
+  node [fontname = courier, shape = box, colorscheme = paired6]
+  edge [fontname = courier]
+
+</xsl:text>
  <xsl:apply-templates select="state"/>
  <xsl:text>}&#10;</xsl:text>
 </xsl:template>
@@ -64,11 +68,87 @@
  <xsl:call-template name="output-node">
    <xsl:with-param name="number" select="@number"/>
    <xsl:with-param name="label">
-      <xsl:value-of select="@number"/>
      <xsl:apply-templates select="itemset/item"/>
    </xsl:with-param>
  </xsl:call-template>
  <xsl:apply-templates select="actions/transitions"/>
+  <xsl:apply-templates select="actions/reductions">
+    <xsl:with-param name="staten">
+      <xsl:value-of select="@number"/>
+    </xsl:with-param>
+  </xsl:apply-templates>
+</xsl:template>
+
+<xsl:template match="actions/reductions">
+  <xsl:param name="staten"/>
+  <xsl:for-each select='reduction'>
+    <!-- These variables are needed because the current context can't be
+         refered to directly in XPath expressions. -->
+    <xsl:variable name="rul">
+      <xsl:value-of select="@rule"/>
+    </xsl:variable>
+    <xsl:variable name="ena">
+      <xsl:value-of select="@enabled"/>
+    </xsl:variable>
+    <!-- The foreach's body is protected by this, so that we are actually
+         going to iterate once per reduction rule, and not per lookahead. -->
+    <xsl:if test='not(preceding-sibling::*[@rule=$rul and @enabled=$ena])'>
+      <xsl:variable name="rule">
+        <xsl:choose>
+          <!-- The acceptation state is refered to as 'accept' in the XML, but
+               just as '0' in the DOT. -->
+          <xsl:when test="@rule='accept'">
+            <xsl:text>0</xsl:text>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="@rule"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:variable>
+
+      <!-- The edge's beginning -->
+      <xsl:call-template name="reduction-edge-start">
+        <xsl:with-param name="state" select="$staten"/>
+        <xsl:with-param name="rule" select="$rule"/>
+        <xsl:with-param name="enabled" select="@enabled"/>
+      </xsl:call-template>
+
+      <!-- The edge's tokens -->
+      <!-- Don't show labels for the default action. In other cases, there will
+           always be at least one token, so 'label="[]"' will not occur. -->
+      <xsl:if test='$rule!=0 and not(../reduction[@enabled=$ena and @rule=$rule and @symbol="$default"])'>
+        <xsl:text>label="[</xsl:text>
+        <xsl:for-each select='../reduction[@enabled=$ena and @rule=$rule]'>
+          <xsl:call-template name="escape">
+            <xsl:with-param name="subject" select="@symbol"/>
+          </xsl:call-template>
+          <xsl:if test="position() != last ()">
+            <xsl:text>, </xsl:text>
+          </xsl:if>
+        </xsl:for-each>
+        <xsl:text>]", </xsl:text>
+      </xsl:if>
+
+      <!-- The edge's end -->
+      <xsl:text>style=solid]&#10;</xsl:text>
+
+      <!-- The diamond representing the reduction -->
+      <xsl:call-template name="reduction-node">
+        <xsl:with-param name="state" select="$staten"/>
+        <xsl:with-param name="rule" select="$rule"/>
+        <xsl:with-param name="color">
+          <xsl:choose>
+            <xsl:when test='@enabled="true"'>
+              <xsl:text>3</xsl:text>
+            </xsl:when>
+            <xsl:otherwise>
+              <xsl:text>5</xsl:text>
+            </xsl:otherwise>
+          </xsl:choose>
+        </xsl:with-param>
+      </xsl:call-template>
+    </xsl:if>
+  </xsl:for-each>
 </xsl:template>

 <xsl:template match="actions/transitions">
@@ -76,17 +156,48 @@
 </xsl:template>

 <xsl:template match="item">
+  <xsl:param name="prev-rule-number"
+    select="preceding-sibling::item[1]/@rule-number"/>
  <xsl:apply-templates select="key('bison:ruleByNumber', @rule-number)">
    <xsl:with-param name="point" select="@point"/>
+    <xsl:with-param name="num" select="@rule-number"/>
+    <xsl:with-param name="prev-lhs"
+      select="key('bison:ruleByNumber', $prev-rule-number)/lhs[text()]"
+   />
  </xsl:apply-templates>
  <xsl:apply-templates select="lookaheads"/>
 </xsl:template>

 <xsl:template match="rule">
  <xsl:param name="point"/>
+  <xsl:param name="num"/>
+  <xsl:param name="prev-lhs"/>
  <xsl:text>&#10;</xsl:text>
-  <xsl:value-of select="lhs"/>
-  <xsl:text> -&gt;</xsl:text>
+  <xsl:choose>
+    <xsl:when test="$num &lt; 10">
+      <xsl:text>  </xsl:text>
+    </xsl:when>
+    <xsl:when test="$num &lt; 100">
+      <xsl:text> </xsl:text>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:text></xsl:text>
+    </xsl:otherwise>
+  </xsl:choose>
+  <xsl:value-of select="$num"/>
+  <xsl:text> </xsl:text>
+  <xsl:choose>
+  <xsl:when test="$prev-lhs = lhs[text()]">
+      <xsl:call-template name="lpad">
+        <xsl:with-param name="str" select="'|'"/>
+        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 1"/>
+      </xsl:call-template>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:value-of select="lhs"/>
+      <xsl:text>:</xsl:text>
+    </xsl:otherwise>
+  </xsl:choose>
  <xsl:if test="$point = 0">
    <xsl:text> .</xsl:text>
  </xsl:if>
@@ -106,7 +217,7 @@
 <xsl:template match="empty"/>

 <xsl:template match="lookaheads">
-  <xsl:text>[</xsl:text>
+  <xsl:text>  [</xsl:text>
  <xsl:apply-templates select="symbol"/>
  <xsl:text>]</xsl:text>
 </xsl:template>
@@ -118,6 +229,50 @@
  </xsl:if>
 </xsl:template>

+<xsl:template name="reduction-edge-start">
+  <xsl:param name="state"/>
+  <xsl:param name="rule"/>
+  <xsl:param name="enabled"/>
+
+  <xsl:text>  </xsl:text>
+  <xsl:value-of select="$state"/>
+  <xsl:text> -> "</xsl:text>
+  <xsl:value-of select="$state"/>
+  <xsl:text>R</xsl:text>
+  <xsl:value-of select="$rule"/>
+  <xsl:if test='$enabled = "false"'>
+    <xsl:text>d</xsl:text>
+  </xsl:if>
+  <xsl:text>" [</xsl:text>
+</xsl:template>
+
+<xsl:template name="reduction-node">
+  <xsl:param name="state"/>
+  <xsl:param name="rule"/>
+  <xsl:param name="color"/>
+
+  <xsl:text> "</xsl:text>
+  <xsl:value-of select="$state"/>
+  <xsl:text>R</xsl:text>
+  <xsl:value-of select="$rule"/>
+  <xsl:if test="$color = 5">
+    <xsl:text>d</xsl:text>
+  </xsl:if>
+  <xsl:text>" [label="</xsl:text>
+  <xsl:choose>
+  <xsl:when test="$rule = 0">
+    <xsl:text>Acc", fillcolor=1</xsl:text>
+  </xsl:when>
+  <xsl:otherwise>
+    <xsl:text>R</xsl:text>
+    <xsl:value-of select="$rule"/>
+    <xsl:text>", fillcolor=</xsl:text>
+    <xsl:value-of select="$color"/>
+  </xsl:otherwise>
+  </xsl:choose>
+  <xsl:text>, shape=diamond, style=filled]&#10;</xsl:text>
+</xsl:template>
+
 <xsl:template match="transition">
  <xsl:call-template name="output-edge">
    <xsl:with-param name="src" select="../../../@number"/>
@@ -149,10 +304,13 @@
  <xsl:text>  </xsl:text>
  <xsl:value-of select="$number"/>
  <xsl:text> [label="</xsl:text>
+  <xsl:text>State </xsl:text>
+  <xsl:value-of select="$number"/>
+  <xsl:text>\n</xsl:text>
  <xsl:call-template name="escape">
    <xsl:with-param name="subject" select="$label"/>
  </xsl:call-template>
-  <xsl:text>"]&#10;</xsl:text>
+  <xsl:text>\l"]&#10;</xsl:text>
 </xsl:template>

 <xsl:template name="output-edge">
@@ -193,7 +351,7 @@
      </xsl:call-template>
    </xsl:with-param>
    <xsl:with-param name="search" select="'&#10;'"/>
-    <xsl:with-param name="replace" select="'\n'"/>
+    <xsl:with-param name="replace" select="'\l'"/>
  </xsl:call-template>
 </xsl:template>

@@ -219,4 +377,21 @@
  </xsl:choose>
 </xsl:template>

+<xsl:template name="lpad">
+  <xsl:param name="str" select="''"/>
+  <xsl:param name="pad" select="0"/>
+  <xsl:variable name="diff" select="$pad - string-length($str)" />
+  <xsl:choose>
+    <xsl:when test="$diff &lt; 0">
+      <xsl:value-of select="$str"/>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:call-template name="space">
+        <xsl:with-param name="repeat" select="$diff"/>
+      </xsl:call-template>
+      <xsl:value-of select="$str"/>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
 </xsl:stylesheet>
@@ -230,7 +230,7 @@
 <xsl:template match="automaton/state">
  <xsl:param name="pad"/>
  <xsl:text>&#10;&#10;</xsl:text>
-  <xsl:text>state </xsl:text>
+  <xsl:text>State </xsl:text>
  <xsl:value-of select="@number"/>
  <xsl:text>&#10;&#10;</xsl:text>
  <xsl:apply-templates select="itemset/item">
@@ -522,18 +522,6 @@
  </xsl:choose>
 </xsl:template>

-<xsl:template name="space">
-  <xsl:param name="repeat">0</xsl:param>
-  <xsl:param name="fill" select="' '"/>
-  <xsl:if test="number($repeat) &gt;= 1">
-    <xsl:call-template name="space">
-      <xsl:with-param name="repeat" select="$repeat - 1"/>
-      <xsl:with-param name="fill" select="$fill"/>
-    </xsl:call-template>
-    <xsl:value-of select="$fill"/>
-  </xsl:if>
-</xsl:template>
-
 <xsl:template name="line-wrap">
  <xsl:param name="line-length"/> <!-- required -->
  <xsl:param name="first-line-length" select="$line-length"/>
@@ -65,24 +65,36 @@ m4_define_default([b4_stack_depth_init],  [200])
 ## ------------------------ ##

 b4_percent_define_default([[api.pure]], [[false]])
-b4_define_flag_if([pure])
-m4_define([b4_pure_flag],
-          [b4_percent_define_flag_if([[api.pure]], [[1]], [[0]])])
+b4_percent_define_check_values([[[[api.pure]],
+                                 [[false]], [[true]], [[]], [[full]]]])

-# b4_yacc_pure_if(IF-TRUE, IF-FALSE)
-# ----------------------------------
-# Expand IF-TRUE, if %pure-parser and %parse-param, IF-FALSE otherwise.
-m4_define([b4_yacc_pure_if],
-[b4_pure_if([m4_ifset([b4_parse_param],
-		      [$1], [$2])],
-	    [$2])])
+m4_define([b4_pure_flag], [[0]])
+m4_case(b4_percent_define_get([[api.pure]]),
+        [false], [m4_define([b4_pure_flag], [[0]])],
+        [true],  [m4_define([b4_pure_flag], [[1]])],
+        [],      [m4_define([b4_pure_flag], [[1]])],
+        [full],  [m4_define([b4_pure_flag], [[2]])])

+m4_define([b4_pure_if],
+[m4_case(b4_pure_flag,
+         [0], [$2],
+         [1], [$1],
+         [2], [$1])])
+         [m4_fatal([invalid api.pure value: ]$1)])])
+
+# b4_yyerror_arg_loc_if(ARG)
+# --------------------------
+# Expand ARG iff yyerror is to be given a location as argument.
+m4_define([b4_yyerror_arg_loc_if],
+[b4_locations_if([m4_case(b4_pure_flag,
+                          [1], [m4_ifset([b4_parse_param], [$1])],
+                          [2], [$1])])])

 # b4_yyerror_args
 # ---------------
 # Arguments passed to yyerror: user args plus yylloc.
 m4_define([b4_yyerror_args],
-[b4_yacc_pure_if([b4_locations_if([&yylloc, ])])dnl
+[b4_yyerror_arg_loc_if([&yylloc, ])dnl
 m4_ifset([b4_parse_param], [b4_c_args(b4_parse_param), ])])


@@ -158,9 +170,9 @@ m4_define([b4_rhs_location],
 [(yylsp@{($2) - ($1)@})])


-## ------------------ ##
-## Parser variables.  ##
-## ------------------ ##
+## -------------- ##
+## Declarations.  ##
+## -------------- ##

 # b4_declare_scanner_communication_variables
 # ------------------------------------------
@@ -170,11 +182,36 @@ m4_define([b4_declare_scanner_communication_variables], [[
 /* The lookahead symbol.  */
 int yychar;

+]b4_pure_if([[
+#if defined __GNUC__ && 407 <= __GNUC__ * 100 + __GNUC_MINOR__
+/* Suppress an incorrect diagnostic about yylval being uninitialized.  */
+# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN \
+    _Pragma ("GCC diagnostic push") \
+    _Pragma ("GCC diagnostic ignored \"-Wuninitialized\"")\
+    _Pragma ("GCC diagnostic ignored \"-Wmaybe-uninitialized\"")
+# define YY_IGNORE_MAYBE_UNINITIALIZED_END \
+    _Pragma ("GCC diagnostic pop")
+#else
+/* Default value used for initialization, for pacifying older GCCs
+   or non-GCC compilers.  */
+static YYSTYPE yyval_default;
+# define YY_INITIAL_VALUE(Value) = Value
+#endif]b4_locations_if([[
+static YYLTYPE yyloc_default][]b4_yyloc_default[;]])])[
+#ifndef YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
+# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
+# define YY_IGNORE_MAYBE_UNINITIALIZED_END
+#endif
+#ifndef YY_INITIAL_VALUE
+# define YY_INITIAL_VALUE(Value) /* Nothing. */
+#endif
+
 /* The semantic value of the lookahead symbol.  */
-YYSTYPE yylval;]b4_locations_if([[
+YYSTYPE yylval YY_INITIAL_VALUE(yyval_default);]b4_locations_if([[

 /* Location data for the lookahead symbol.  */
-YYLTYPE yylloc;]])b4_pure_if([], [[
+YYLTYPE yylloc]b4_pure_if([ = yyloc_default], [b4_yyloc_default])[;
+]])b4_pure_if([], [[

 /* Number of syntax errors so far.  */
 int yynerrs;]])])
@@ -225,14 +262,76 @@ m4_define([b4_declare_parser_state_variables], [b4_pure_if([[
    YYSIZE_T yyes_capacity;]])])


-## --------------------------------------------------------- ##
-## Defining symbol actions, e.g., printers and destructors.  ##
-## --------------------------------------------------------- ##
+# b4_declare_yyparse_push_
+# ------------------------
+# Declaration of yyparse (and dependencies) when using the push parser
+# (including in pull mode).
+m4_define([b4_declare_yyparse_push_],
+[[#ifndef YYPUSH_MORE_DEFINED
+# define YYPUSH_MORE_DEFINED
+enum { YYPUSH_MORE = 4 };
+#endif

-# We do want M4 expansion after # for CPP macros.
-m4_changecom()
-m4_divert_push(0)dnl
-@output(b4_parser_file_name@)@
+typedef struct ]b4_prefix[pstate ]b4_prefix[pstate;
+
+]b4_pull_if([b4_c_function_decl([b4_prefix[parse]], [[int]], b4_parse_param)
+])b4_c_function_decl([b4_prefix[push_parse]], [[int]],
+  [[b4_prefix[pstate *ps]], [[ps]]]b4_pure_if([,
+  [[[int pushed_char]], [[pushed_char]]],
+  [[b4_api_PREFIX[STYPE const *pushed_val]], [[pushed_val]]]b4_locations_if([,
+  [[b4_api_PREFIX[LTYPE *pushed_loc]], [[pushed_loc]]]])])m4_ifset([b4_parse_param], [,
+  b4_parse_param]))
+b4_pull_if([b4_c_function_decl([b4_prefix[pull_parse]], [[int]],
+  [[b4_prefix[pstate *ps]], [[ps]]]m4_ifset([b4_parse_param], [,
+  b4_parse_param]))])
+b4_c_function_decl([b4_prefix[pstate_new]], [b4_prefix[pstate *]],
+                    [[[void]], []])
+b4_c_function_decl([b4_prefix[pstate_delete]], [[void]],
+                   [[b4_prefix[pstate *ps]], [[ps]]])dnl
+])
+
+# b4_declare_yyparse_
+# -------------------
+# When not the push parser.
+m4_define([b4_declare_yyparse_],
+[[#ifdef YYPARSE_PARAM
+]b4_c_function_decl(b4_prefix[parse], [int],
+                    [[void *YYPARSE_PARAM], [YYPARSE_PARAM]])[
+#else /* ! YYPARSE_PARAM */
+]b4_c_function_decl(b4_prefix[parse], [int], b4_parse_param)[
+#endif /* ! YYPARSE_PARAM */]dnl
+])
+
+
+# b4_declare_yyparse
+# ------------------
+m4_define([b4_declare_yyparse],
+[b4_push_if([b4_declare_yyparse_push_],
+            [b4_declare_yyparse_])[]dnl
+])
+
+
+# b4_shared_declarations
+# ----------------------
+# Declaration that might either go into the header (if --defines)
+# or open coded in the parser body.
+m4_define([b4_shared_declarations],
+[b4_cpp_guard_open([b4_spec_defines_file])[
+]b4_declare_yydebug[
+]b4_percent_code_get([[requires]])[
+]b4_token_enums_defines(b4_tokens)[
+]b4_declare_yylstype[
+]b4_declare_yyparse[
+]b4_percent_code_get([[provides]])[
+]b4_cpp_guard_close([b4_spec_defines_file])[]dnl
+])
+
+
+## -------------- ##
+## Output files.  ##
+## -------------- ##
+
+b4_output_begin([b4_parser_file_name])
 b4_copyright([Bison implementation for Yacc-like parsers in C],
             [1984, 1989-1990, 2000-2012])[

@@ -248,7 +347,11 @@ b4_copyright([Bison implementation for Yacc-like parsers in C],

 ]b4_identification
 b4_percent_code_get([[top]])[]dnl
-m4_if(b4_prefix, [yy], [],
+m4_if(b4_api_prefix, [yy], [],
+[[/* Substitute the type names.  */
+#define YYSTYPE         ]b4_api_PREFIX[STYPE]b4_locations_if([[
+#define YYLTYPE         ]b4_api_PREFIX[LTYPE]])])[
+]m4_if(b4_prefix, [yy], [],
 [[/* Substitute the variable and function names.  */]b4_pull_if([[
 #define yyparse         ]b4_prefix[parse]])b4_push_if([[
 #define yypush_parse    ]b4_prefix[push_parse]b4_pull_if([[
@@ -261,19 +364,14 @@ m4_if(b4_prefix, [yy], [],
 #define yylval          ]b4_prefix[lval
 #define yychar          ]b4_prefix[char
 #define yydebug         ]b4_prefix[debug
-#define yynerrs         ]b4_prefix[nerrs
-]b4_locations_if([[#define yylloc          ]b4_prefix[lloc]])])[
+#define yynerrs         ]b4_prefix[nerrs]b4_locations_if([[
+#define yylloc          ]b4_prefix[lloc]])])[

 /* Copy the first part of user declarations.  */
 ]b4_user_pre_prologue[

 ]b4_null_define[

-/* Enabling traces.  */
-#ifndef YYDEBUG
-# define YYDEBUG ]b4_debug_flag[
-#endif
-
 /* Enabling verbose error messages.  */
 #ifdef YYERROR_VERBOSE
 # undef YYERROR_VERBOSE
@@ -282,66 +380,13 @@ m4_if(b4_prefix, [yy], [],
 # define YYERROR_VERBOSE ]b4_error_verbose_flag[
 #endif

-/* Enabling the token table.  */
-#ifndef YYTOKEN_TABLE
-# define YYTOKEN_TABLE ]b4_token_table[
-#endif
+]m4_ifval(m4_quote(b4_spec_defines_file),
+[[/* In a future release of Bison, this section will be replaced
+   by #include "@basename(]b4_spec_defines_file[@)".  */
+]])dnl
+b4_shared_declarations[

-]b4_percent_code_get([[requires]])[]dnl
-
-b4_token_enums_defines(b4_tokens)[
-
-#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
-]m4_ifdef([b4_stype],
-[[typedef union ]b4_union_name[
-{
-]b4_user_stype[
-} YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1]],
-[m4_if(b4_tag_seen_flag, 0,
-[[typedef int YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1]])])[
-# define yystype YYSTYPE /* obsolescent; will be withdrawn */
-# define YYSTYPE_IS_DECLARED 1
-#endif]b4_locations_if([[
-
-#if ! defined YYLTYPE && ! defined YYLTYPE_IS_DECLARED
-typedef struct YYLTYPE
-{
-  int first_line;
-  int first_column;
-  int last_line;
-  int last_column;
-} YYLTYPE;
-# define yyltype YYLTYPE /* obsolescent; will be withdrawn */
-# define YYLTYPE_IS_DECLARED 1
-# define YYLTYPE_IS_TRIVIAL 1
-#endif]])b4_push_if([[
-
-#ifndef YYPUSH_DECLS
-#  define YYPUSH_DECLS
-struct yypstate;
-typedef struct yypstate yypstate;
-enum { YYPUSH_MORE = 4 };
-
-]b4_pull_if([b4_c_function_decl([[yyparse]], [[int]], b4_parse_param)
-])b4_c_function_decl([[yypush_parse]], [[int]],
-  [[[yypstate *yyps]], [[yyps]]]b4_pure_if([,
-  [[[int yypushed_char]], [[yypushed_char]]],
-  [[[YYSTYPE const *yypushed_val]], [[yypushed_val]]]b4_locations_if([,
-  [[[YYLTYPE const *yypushed_loc]], [[yypushed_loc]]]])])m4_ifset([b4_parse_param], [,
-  b4_parse_param]))
-b4_pull_if([b4_c_function_decl([[yypull_parse]], [[int]],
-  [[[yypstate *yyps]], [[yyps]]]m4_ifset([b4_parse_param], [,
-  b4_parse_param]))])
-b4_c_function_decl([[yypstate_new]], [[yypstate *]], [[[void]], []])
-b4_c_function_decl([[yypstate_delete]], [[void]],
-                   [[[yypstate *yyps]], [[yyps]]])[
-#endif]])
-
-b4_percent_code_get([[provides]])[]dnl
-
-[/* Copy the second part of user declarations.  */
+/* Copy the second part of user declarations.  */
 ]b4_user_post_prologue
 b4_percent_code_get[]dnl

@@ -394,24 +439,24 @@ typedef short int yytype_int16;
 # if defined YYENABLE_NLS && YYENABLE_NLS
 #  if ENABLE_NLS
 #   include <libintl.h> /* INFRINGES ON USER NAME SPACE */
-#   define YY_(msgid) dgettext ("bison-runtime", msgid)
+#   define YY_(Msgid) dgettext ("bison-runtime", Msgid)
 #  endif
 # endif
 # ifndef YY_
-#  define YY_(msgid) msgid
+#  define YY_(Msgid) Msgid
 # endif
 #endif

 /* Suppress unused-variable warnings by "using" E.  */
 #if ! defined lint || defined __GNUC__
-# define YYUSE(e) ((void) (e))
+# define YYUSE(E) ((void) (E))
 #else
-# define YYUSE(e) /* empty */
+# define YYUSE(E) /* empty */
 #endif

 /* Identity function, used to suppress warnings about constant conditions.  */
 #ifndef lint
-# define YYID(n) (n)
+# define YYID(N) (N)
 #else
 ]b4_c_function_def([YYID], [static int], [[int yyi], [yyi]])[
 {
@@ -491,8 +536,8 @@ void free (void *); /* INFRINGES ON USER NAME SPACE */

 #if (! defined yyoverflow \
     && (! defined __cplusplus \
-	 || (]b4_locations_if([[defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL \
-	     && ]])[defined YYSTYPE_IS_TRIVIAL && YYSTYPE_IS_TRIVIAL)))
+	 || (]b4_locations_if([[defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL \
+	     && ]])[defined ]b4_api_PREFIX[STYPE_IS_TRIVIAL && ]b4_api_PREFIX[STYPE_IS_TRIVIAL)))

 /* A type that is properly aligned for any stack member.  */
 union yyalloc
@@ -582,7 +627,7 @@ static const ]b4_int_type_for([b4_translate])[ yytranslate[] =
  ]b4_translate[
 };

-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
 /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
   YYRHS.  */
 static const ]b4_int_type_for([b4_prhs])[ yyprhs[] =
@@ -603,7 +648,7 @@ static const ]b4_int_type_for([b4_rline])[ yyrline[] =
 };
 #endif

-#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
+#if ]b4_api_PREFIX[DEBUG || YYERROR_VERBOSE || ]b4_token_table_flag[
 /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
   First, the terminals, then, starting at YYNTOKENS, nonterminals.  */
 static const char *const yytname[] =
@@ -670,11 +715,11 @@ static const ]b4_int_type_for([b4_table])[ yytable[] =
  ]b4_table[
 };

-#define yypact_value_is_default(yystate) \
-  ]b4_table_value_equals([[pact]], [[yystate]], [b4_pact_ninf])[
+#define yypact_value_is_default(Yystate) \
+  ]b4_table_value_equals([[pact]], [[Yystate]], [b4_pact_ninf])[

-#define yytable_value_is_error(yytable_value) \
-  ]b4_table_value_equals([[table]], [[yytable_value]], [b4_table_ninf])[
+#define yytable_value_is_error(Yytable_value) \
+  ]b4_table_value_equals([[table]], [[Yytable_value]], [b4_table_ninf])[

 static const ]b4_int_type_for([b4_check])[ yycheck[] =
 {
@@ -733,62 +778,17 @@ do                                                              \
    }								\
 while (YYID (0))

-
+/* Error token number */
 #define YYTERROR	1
 #define YYERRCODE	256

-
-/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
-   If N is 0, then set CURRENT to the empty location which ends
-   the previous symbol: RHS[0] (always defined).  */
-
+]b4_locations_if([[
+]b4_yylloc_default_define[
 #define YYRHSLOC(Rhs, K) ((Rhs)[K])
-#ifndef YYLLOC_DEFAULT
-# define YYLLOC_DEFAULT(Current, Rhs, N)				\
-    do									\
-      if (YYID (N))                                                    \
-	{								\
-	  (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;	\
-	  (Current).first_column = YYRHSLOC (Rhs, 1).first_column;	\
-	  (Current).last_line    = YYRHSLOC (Rhs, N).last_line;		\
-	  (Current).last_column  = YYRHSLOC (Rhs, N).last_column;	\
-	}								\
-      else								\
-	{								\
-	  (Current).first_line   = (Current).last_line   =		\
-	    YYRHSLOC (Rhs, 0).last_line;				\
-	  (Current).first_column = (Current).last_column =		\
-	    YYRHSLOC (Rhs, 0).last_column;				\
-	}								\
-    while (YYID (0))
-#endif]b4_locations_if([[
-
-
-/* YY_LOCATION_PRINT -- Print the location on the stream.
-   This macro was not mandated originally: define only if we know
-   we won't break user code: when these are the locations we know.  */
-
-#ifndef YY_LOCATION_PRINT
-# if defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL
-#  define YY_LOCATION_PRINT(File, Loc)			\
-     fprintf (File, "%d.%d-%d.%d",			\
-	      (Loc).first_line, (Loc).first_column,	\
-	      (Loc).last_line,  (Loc).last_column)
-# else
-#  define YY_LOCATION_PRINT(File, Loc) ((void) 0)
-# endif
-#endif]], [[
-
-
-/* This macro is provided for backward compatibility. */
-
-#ifndef YY_LOCATION_PRINT
-# define YY_LOCATION_PRINT(File, Loc) ((void) 0)
-#endif]])[
-
+]])[
+]b4_yy_location_print_define[

 /* YYLEX -- calling `yylex' with the right arguments.  */
-
 #ifdef YYLEX_PARAM
 # define YYLEX yylex (]b4_pure_if([&yylval[]b4_locations_if([, &yylloc]), ])[YYLEX_PARAM)
 #else
@@ -796,7 +796,7 @@ while (YYID (0))
 #endif

 /* Enable debugging if requested.  */
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG

 # ifndef YYFPRINTF
 #  include <stdio.h> /* INFRINGES ON USER NAME SPACE */
@@ -883,12 +883,12 @@ do {					\
 /* Nonzero means print parse trace.  It is left uninitialized so that
   multiple parsers can coexist.  */
 int yydebug;
-#else /* !YYDEBUG */
+#else /* !]b4_api_PREFIX[DEBUG */
 # define YYDPRINTF(Args)
 # define YY_SYMBOL_PRINT(Title, Type, Value, Location)
 # define YY_STACK_PRINT(Bottom, Top)
 # define YY_REDUCE_PRINT(Rule)
-#endif /* !YYDEBUG */
+#endif /* !]b4_api_PREFIX[DEBUG */


 /* YYINITDEPTH -- initial size of the parser's stacks.  */
@@ -919,7 +919,7 @@ int yydebug;
   required.  Return 1 if memory is exhausted.  */
 static int
 yy_lac_stack_realloc (YYSIZE_T *yycapacity, YYSIZE_T yyadd,
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
                      char const *yydebug_prefix,
                      char const *yydebug_suffix,
 #endif
@@ -1025,7 +1025,7 @@ do {                                                             \
   the parser stacks to try to find a new initial context in which the
   current lookahead is syntactically acceptable.  If it fails to find
   such a context, it discards the lookahead.  */
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
 # define YY_LAC_DISCARD(Event)                                           \
 do {                                                                     \
  if (yy_lac_established)                                                \
@@ -1128,7 +1128,7 @@ yy_lac (yytype_int16 *yyesa, yytype_int16 **yyes,
        else
          {
            if (yy_lac_stack_realloc (yyes_capacity, 1,
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
                                      " (", ")",
 #endif
                                      yyes, yyesa, &yyesp, yyes_prev))
@@ -1335,7 +1335,7 @@ yysyntax_error (YYSIZE_T *yymsg_alloc, char **yymsg,
                yysize = yysize1;
              }
        }]b4_lac_if([[
-# if YYDEBUG
+# if ]b4_api_PREFIX[DEBUG
      else if (yydebug)
        YYFPRINTF (stderr, "No expected tokens.\n");
 # endif]])[
@@ -1392,20 +1392,12 @@ yysyntax_error (YYSIZE_T *yymsg_alloc, char **yymsg,
 }
 #endif /* YYERROR_VERBOSE */

-]b4_yydestruct_generate([b4_c_function_def])b4_push_if([], [[
+]b4_yydestruct_generate([b4_c_function_def])[

-
-/* Prevent warnings from -Wmissing-prototypes.  */
-#ifdef YYPARSE_PARAM
-]b4_c_function_decl([yyparse], [int],
-                    [[void *YYPARSE_PARAM], [YYPARSE_PARAM]])[
-#else /* ! YYPARSE_PARAM */
-]b4_c_function_decl([yyparse], [int], b4_parse_param)[
-#endif /* ! YYPARSE_PARAM */]])b4_pure_if([], [
+]b4_pure_if([], [

 b4_declare_scanner_communication_variables])[]b4_push_if([[

-
 struct yypstate
  {]b4_declare_parser_state_variables[
    /* Used to determine if this is the first time this instance has
@@ -1429,7 +1421,8 @@ b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
  yypstate *yyps_local;]b4_pure_if([[
  int yychar;
  YYSTYPE yylval;]b4_locations_if([[
-  YYLTYPE yylloc;]])])[
+  static YYLTYPE yyloc_default][]b4_yyloc_default[;
+  YYLTYPE yylloc = yyloc_default;]])])[
  if (yyps)
    yyps_local = yyps;
  else
@@ -1509,7 +1502,7 @@ b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
  [[[yypstate *yyps]], [[yyps]]]b4_pure_if([,
  [[[int yypushed_char]], [[yypushed_char]]],
  [[[YYSTYPE const *yypushed_val]], [[yypushed_val]]]b4_locations_if([,
-  [[[YYLTYPE const *yypushed_loc]], [[yypushed_loc]]]])])m4_ifset([b4_parse_param], [,
+  [[[YYLTYPE *yypushed_loc]], [[yypushed_loc]]]])])m4_ifset([b4_parse_param], [,
  b4_parse_param]))], [[


@@ -1535,7 +1528,7 @@ b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
  int yyn;
  int yyresult;
  /* Lookahead token as an internal (translated) token number.  */
-  int yytoken;
+  int yytoken = 0;
  /* The variables used to return semantic value and location from the
     action routines.  */
  YYSTYPE yyval;]b4_locations_if([[
@@ -1560,10 +1553,9 @@ b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
      goto yyread_pushed_token;
    }]])[

-  yytoken = 0;
-  yyss = yyssa;
-  yyvs = yyvsa;]b4_locations_if([[
-  yyls = yylsa;]])[
+  yyssp = yyss = yyssa;
+  yyvsp = yyvs = yyvsa;]b4_locations_if([[
+  yylsp = yyls = yylsa;]])[
  yystacksize = YYINITDEPTH;]b4_lac_if([[

  yyes = yyesa;
@@ -1577,32 +1569,17 @@ b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
  yyerrstatus = 0;
  yynerrs = 0;
  yychar = YYEMPTY; /* Cause a token to be read.  */
-
-  /* Initialize stack pointers.
-     Waste one element of value and location stack
-     so that they stay on the same level as the state stack.
-     The wasted elements are never initialized.  */
-  yyssp = yyss;
-  yyvsp = yyvs;]b4_locations_if([[
-  yylsp = yyls;
-
-#if defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL
-  /* Initialize the default location before parsing starts.  */
-  yylloc.first_line   = yylloc.last_line   = ]b4_location_initial_line[;
-  yylloc.first_column = yylloc.last_column = ]b4_location_initial_column[;
-#endif]])
-m4_ifdef([b4_initial_action],[
-m4_pushdef([b4_at_dollar],     [m4_define([b4_at_dollar_used])yylloc])dnl
-m4_pushdef([b4_dollar_dollar], [m4_define([b4_dollar_dollar_used])yylval])dnl
+]m4_ifdef([b4_initial_action], [
+b4_dollar_pushdef([m4_define([b4_dollar_dollar_used])yylval], [],
+                  [b4_push_if([b4_pure_if([*])yypushed_loc], [yylloc])])dnl
 /* User initialization code.  */
 b4_user_initial_action
-m4_popdef([b4_dollar_dollar])dnl
-m4_popdef([b4_at_dollar])])dnl
+b4_dollar_popdef[]dnl
 m4_ifdef([b4_dollar_dollar_used],[[  yyvsp[0] = yylval;
+]])])dnl
+b4_locations_if([[  yylsp[0] = ]b4_push_if([b4_pure_if([*])yypushed_loc], [yylloc])[;
 ]])dnl
-m4_ifdef([b4_at_dollar_used], [[  yylsp[0] = yylloc;
-]])[
-  goto yysetstate;
+[  goto yysetstate;

 /*------------------------------------------------------------.
 | yynewstate -- Push a new state, which is found in yystate.  |
@@ -1772,7 +1749,9 @@ yyread_pushed_token:]])[
  YY_LAC_DISCARD ("shift");]])[

  yystate = yyn;
+  YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
  *++yyvsp = yylval;
+  YY_IGNORE_MAYBE_UNINITIALIZED_END
 ]b4_locations_if([  *++yylsp = yylloc;])[
  goto yynewstate;

@@ -1992,7 +1971,9 @@ yyerrlab1:
     current lookahead token, the shift below will for sure.  */
  YY_LAC_DISCARD ("error recovery");]])[

+  YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
  *++yyvsp = yylval;
+  YY_IGNORE_MAYBE_UNINITIALIZED_END
 ]b4_locations_if([[
  yyerror_range[2] = yylloc;
  /* Using YYLLOC is tempting, but would change the location of
@@ -2068,70 +2049,14 @@ yypushreturn:]])[
 }


-]b4_epilogue
+]b4_epilogue[]dnl
+b4_output_end()
+
 b4_defines_if(
-[@output(b4_spec_defines_file@)@
-b4_copyright([Bison interface for Yacc-like parsers in C],
-             [1984, 1989-1990, 2000-2012])
+[b4_output_begin([b4_spec_defines_file])[
+]b4_copyright([Bison interface for Yacc-like parsers in C],
+              [1984, 1989-1990, 2000-2012])[

-b4_percent_code_get([[requires]])[]dnl
-
-b4_token_enums_defines(b4_tokens)
-
-[#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
-]m4_ifdef([b4_stype],
-[[typedef union ]b4_union_name[
-{
-]b4_user_stype[
-} YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1]],
-[m4_if(b4_tag_seen_flag, 0,
-[[typedef int YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1]])])[
-# define yystype YYSTYPE /* obsolescent; will be withdrawn */
-# define YYSTYPE_IS_DECLARED 1
-#endif
-
-]b4_pure_if([], [[extern YYSTYPE ]b4_prefix[lval;]])
-
-b4_locations_if(
-[#if ! defined YYLTYPE && ! defined YYLTYPE_IS_DECLARED
-typedef struct YYLTYPE
-{
-  int first_line;
-  int first_column;
-  int last_line;
-  int last_column;
-} YYLTYPE;
-# define yyltype YYLTYPE /* obsolescent; will be withdrawn */
-# define YYLTYPE_IS_DECLARED 1
-# define YYLTYPE_IS_TRIVIAL 1
-#endif
-
-]b4_pure_if([], [[extern YYLTYPE ]b4_prefix[lloc;]])
-)dnl b4_locations_if
-b4_push_if([[
-#ifndef YYPUSH_DECLS
-#  define YYPUSH_DECLS
-struct ]b4_prefix[pstate;
-typedef struct ]b4_prefix[pstate ]b4_prefix[pstate;
-enum { YYPUSH_MORE = 4 };
-]b4_pull_if([b4_c_function_decl([b4_prefix[parse]], [[int]], b4_parse_param)
-])b4_c_function_decl([b4_prefix[push_parse]], [[int]],
-  [[b4_prefix[pstate *yyps]], [[yyps]]]b4_pure_if([,
-  [[[int yypushed_char]], [[yypushed_char]]],
-  [[[YYSTYPE const *yypushed_val]], [[yypushed_val]]]b4_locations_if([,
-  [[[YYLTYPE const *yypushed_loc]], [[yypushed_loc]]]])])m4_ifset([b4_parse_param], [,
-  b4_parse_param]))
-b4_pull_if([b4_c_function_decl([b4_prefix[pull_parse]], [[int]],
-  [[b4_prefix[pstate *yyps]], [[yyps]]]m4_ifset([b4_parse_param], [,
-  b4_parse_param]))])
-b4_c_function_decl([b4_prefix[pstate_new]], [b4_prefix[pstate *]],
-                    [[[void]], []])
-b4_c_function_decl([b4_prefix[pstate_delete]], [[void]],
-                   [[b4_prefix[pstate *yyps]], [[yyps]]])[
-#endif
-]])
-b4_percent_code_get([[provides]])[]dnl
-])dnl b4_defines_if
-m4_divert_pop(0)
+]b4_shared_declarations[
+]b4_output_end()
+])
@@ -1,4 +1,3 @@
-/*.info*
 /*~
 /.dirstamp
 /Makefile
@@ -10,6 +9,7 @@
 /bison.dvi
 /bison.fn
 /bison.html
+/bison.info
 /bison.ky
 /bison.log
 /bison.pdf
@@ -940,7 +940,7 @@ EXTERNAL_GROUPS        = YES
 # The PERL_PATH should be the absolute path and name of the perl script
 # interpreter (i.e. the result of `which perl').

-PERL_PATH              = /usr/bin/perl
+PERL_PATH              = @PERL@

 #---------------------------------------------------------------------------
 # Configuration options related to the dot tool
@@ -16,7 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

 AM_MAKEINFOFLAGS = --no-split
-info_TEXINFOS = bison.texinfo
+info_TEXINFOS = bison.texi
 bison_TEXINFOS = $(srcdir)/cross-options.texi gpl-3.0.texi fdl.texi

 CLEANFILES = bison.fns
@@ -30,7 +30,7 @@ $(srcdir)/cross-options.texi: $(top_srcdir)/src/getargs.c $(CROSS_OPTIONS_PL)
 	$(AM_V_at)rm -f $@.tmp
 	$(AM_V_at)cd $(top_builddir)/src && $(MAKE) $(AM_MAKEFLAGS) bison
 	$(AM_V_at)$(top_builddir)/src/bison --help \
-	  | perl $(CROSS_OPTIONS_PL) $(top_srcdir)/src/scan-gram.l >$@.tmp
+	  | $(PERL) $(CROSS_OPTIONS_PL) $(top_srcdir)/src/scan-gram.l >$@.tmp
 	$(AM_V_at)diff -u $@~ $@.tmp || true
 	$(AM_V_at)mv $@.tmp $@
 MAINTAINERCLEANFILES = $(srcdir)/cross-options.texi
@@ -96,6 +96,36 @@ PREPATH = $(top_builddir)/src

 nodist_man_MANS = yacc.1

+## ----------------------------- ##
+## Graphviz examples generation. ##
+## ----------------------------- ##
+
+CLEANDIRS += figs
+FIGS_DOT = figs/example-reduce.dot figs/example-shift.dot
+EXTRA_DIST +=								\
+  $(FIGS_DOT)								\
+  $(FIGS_DOT:.dot=.eps) $(FIGS_DOT:.dot=.pdf) $(FIGS_DOT:.dot=.png)
+SUFFIXES += .dot .eps .pdf .png
+
+bison.dvi:  $(FIGS_DOT:.dot=.eps)
+bison.html: $(FIGS_DOT:.dot=.png)
+bison.pdf:  $(FIGS_DOT:.dot=.pdf)
+
+.dot.eps:
+	$(AM_V_GEN) $(MKDIR_P) `echo "./$@" | sed -e 's,/[^/]*$$,,'`
+	$(AM_V_at) $(DOT) -Gmargin=0 -Teps $< >$@.tmp
+	$(AM_V_at) mv $@.tmp $@
+
+.dot.pdf:
+	$(AM_V_GEN) $(MKDIR_P) `echo "./$@" | sed -e 's,/[^/]*$$,,'`
+	$(AM_V_at) $(DOT) -Gmargin=0 -Tpdf $< >$@.tmp
+	$(AM_V_at) mv $@.tmp $@
+
+.dot.png:
+	$(AM_V_GEN) $(MKDIR_P) `echo "./$@" | sed -e 's,/[^/]*$$,,'`
+	$(AM_V_at) $(DOT) -Gmargin=0 -Tpng $< >$@.tmp
+	$(AM_V_at) mv $@.tmp $@
+
 ## -------------- ##
 ## Doxygenation.  ##
 ## -------------- ##
@@ -0,0 +1,11 @@
+digraph "reduce.y"
+{
+  node [fontname=courier shape=box]
+  edge [fontname=courier]
+
+  1 [label="State 1\n  3 a: \"0\" .  [\".\"]\l  4 b: \"0\" .  [\";\"]\l"]
+  1 -> "1R3" [label="" style=solid]
+ "1R3" [style=filled shape=diamond fillcolor=yellowgreen label="R3"]
+  1 -> "1R4" [label="[\";\"]" style=solid]
+ "1R4" [style=filled shape=diamond fillcolor=yellowgreen label="R4"]
+}
@@ -0,0 +1,13 @@
+       .------------------.
+       |     State 1      |
+       | 3 a: "0" . [";"] |
+       | 4 b: "0" . ["."] |
+       `------------------'
+             /     \
+            /       \ ["."]
+           /         \
+          v           v
+         / \         / \
+        / R \       / R \
+(green) \ 3 /       \ 4 / (green)
+         \ /         \ /
@@ -0,0 +1,9 @@
+digraph "shift.y"
+{
+  node [fontname=courier shape=box]
+  edge [fontname=courier]
+
+  3 [label="State 3\n  1 exp: a . \".\"\l"]
+  3 -> 6 [style=solid label="\".\""]
+  6 [label="State 6\n  1 exp: a \".\" .\l"]
+}
@@ -0,0 +1,12 @@
+.----------------.
+|    State 3     |
+| 1 exp: a . ";" |
+`----------------'
+        |
+        | ";"
+        |
+        v
+.----------------.
+|    State 6     |
+| 1 exp: a ";" . |
+`----------------'
@@ -1,6 +1,3 @@
-A directory of tools provided to people using CVS Bison.  None of
-these is distributed.
-
 * bench.pl
 A primitive Perl script to run benches.  Currently its only bench is
 the usual calculator: it has a lightweight processing part (but not
@@ -28,7 +28,7 @@ $(BISON): $(BISON_IN)
 ## Extracting.  ##
 ## ------------ ##

-doc = $(top_srcdir)/doc/bison.texinfo
+doc = $(top_srcdir)/doc/bison.texi
 extexi = $(top_srcdir)/examples/extexi
 # Extract in src.
 $(srcdir)/calc.stamp: $(doc) $(extexi)
@@ -36,7 +36,7 @@ $(srcdir)/calc.stamp: $(doc) $(extexi)
 	$(AM_V_at)touch $@.tmp
 	$(AM_V_at)cd $(srcdir) && \
 	   $(AWK) -f ../extexi -v VERSION="$(VERSION)" \
-	     ../../doc/bison.texinfo -- calc++-parser.yy \
+	     ../../doc/bison.texi -- calc++-parser.yy \
 	     calc++-scanner.ll calc++.cc calc++-driver.hh calc++-driver.cc
 	$(AM_V_at)mv $@.tmp $@

@@ -1 +0,0 @@
-external: gnulib
@@ -268,3 +268,15 @@
 /xmemdup0.c
 /xmemdup0.h
 /sys_types.in.h
+/obstack_printf.c
+/binary-io.c
+/mbuiter.c
+/xsize.c
+/bitrotate.c
+/math.c
+/sig-handler.c
+/stdio.c
+/unistd.c
+/wctype-h.c
+/getdelim.c
+/getline.c
@@ -0,0 +1,3 @@
+/lock.c
+/lock.h
+/threadlib.c
@@ -17,6 +17,8 @@
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

+#include <config.h>
+
 #include <stdio.h>

 int yyerror (char const *);
@@ -34,6 +34,7 @@
 /fprintf-posix.m4
 /frexp.m4
 /frexpl.m4
+/fseterr.m4
 /fstat.m4
 /getdtablesize.m4
 /getopt.m4
@@ -47,7 +48,6 @@
 /hash.m4
 /iconv.m4
 /include_next.m4
-/inline.m4
 /intdiv0.m4
 /intl.m4
 /intldir.m4
@@ -95,6 +95,7 @@
 /multiarch.m4
 /nls.m4
 /nocrash.m4
+/off_t.m4
 /open.m4
 /pathmax.m4
 /perror.m4
@@ -150,6 +151,7 @@
 /sys_ioctl_h.m4
 /sys_socket_h.m4
 /sys_stat_h.m4
+/sys_types_h.m4
 /sys_wait_h.m4
 /sysexits.m4
 /threadlib.m4
@@ -176,5 +178,7 @@
 /xalloc.m4
 /xsize.m4
 /xstrndup.m4
-/off_t.m4
-/sys_types_h.m4
+/obstack-printf.m4
+/extern-inline.m4
+/getdelim.m4
+/getline.m4
@@ -25,3 +25,47 @@ AC_DEFUN([BISON_TEST_FOR_WORKING_C_COMPILER], [
    [],
    [AC_MSG_FAILURE([cannot compile a simple C program])])
 ])
+
+# BISON_CHECK_WITH_POSIXLY_CORRECT(CODE)
+# --------------------------------------
+# Run the Autoconf CODE with POSIXLY_CORRECT set to 1, and restored to
+# its initial value afterwards.
+AC_DEFUN([BISON_CHECK_WITH_POSIXLY_CORRECT],
+[gl_awk_probe='BEGIN { if ("POSIXLY_CORRECT" in ENVIRON) print "x" }'
+case ${POSIXLY_CORRECT+x}`$AWK "$gl_awk_probe" </dev/null` in
+  xx) gl_had_POSIXLY_CORRECT=exported ;;
+  x)  gl_had_POSIXLY_CORRECT=yes      ;;
+  *)  gl_had_POSIXLY_CORRECT=         ;;
+esac
+POSIXLY_CORRECT=1
+export POSIXLY_CORRECT
+$1
+case $gl_had_POSIXLY_CORRECT in
+  exported) ;;
+  yes) AS_UNSET([POSIXLY_CORRECT]); POSIXLY_CORRECT=1 ;;
+  *) AS_UNSET([POSIXLY_CORRECT]) ;;
+esac
+])
+
+# BISON_C_COMPILER_POSIXLY_CORRECT
+# --------------------------------
+# Whether the compiler supports -g in POSIXLY_CORRECT mode.  clang-2.9
+# on OS X does not, because "clang-mp-2.9 -o test -g test.c" launches
+# "/usr/bin/dsymutil test -o test.dSYM" which fails with "error:
+# unable to open executable '-o'".
+#
+# Sets C_COMPILER_POSIXLY_CORRECT to true/false.
+AC_DEFUN([BISON_C_COMPILER_POSIXLY_CORRECT],
+[AC_CACHE_CHECK([whether $CC supports POSIXLY_CORRECT=1],
+                [bison_cv_cc_supports_posixly_correct],
+[BISON_CHECK_WITH_POSIXLY_CORRECT(
+[AC_LANG_PUSH([C])
+AC_LINK_IFELSE([AC_LANG_PROGRAM],
+                [bison_cv_cc_supports_posixly_correct=yes],
+                [bison_cv_cc_supports_posixly_correct=no])
+AC_LANG_POP([C])])])
+case $bison_cv_cc_supports_posixly_correct in
+  yes) AC_SUBST([C_COMPILER_POSIXLY_CORRECT], [true]) ;;
+  no)  AC_SUBST([C_COMPILER_POSIXLY_CORRECT], [false]);;
+esac
+])
@@ -9,6 +9,7 @@ src/main.c
 src/muscle-tab.c
 src/parse-gram.y
 src/print.c
+src/print_graph.c
 src/reader.c
 src/reduce.c
 src/scan-code.l
@@ -74,11 +74,15 @@ error_message (location *loc,
  vfprintf (stderr, message, args);
  {
    size_t l = strlen (message);
-    if (l < 2 || message[l-2] != ':' || message[l-1] != ' ') {
-      putc ('\n', stderr);
-      fflush (stderr);
-    }
+    if (l < 2 || message[l - 2] != ':' || message[l - 1] != ' ')
+      {
+        putc ('\n', stderr);
+        fflush (stderr);
+        if (loc && feature_flag & feature_caret)
+          location_caret (stderr, *loc);
+      }
  }
+  fflush (stderr);
 }

 /** Wrap error_message() with varargs handling. */
@@ -124,7 +128,7 @@ warn_at_indent (location loc, unsigned *indent,
    return;
  set_warning_issued ();
  indent_ptr = indent;
-  ERROR_MESSAGE (&loc, _("warning"), message);
+  ERROR_MESSAGE (&loc, *indent ? NULL : _("warning"), message);
 }

 void
@@ -144,7 +148,7 @@ warn (const char *message, ...)
 void
 complain_at (location loc, const char *message, ...)
 {
-  ERROR_MESSAGE (&loc, NULL, message);
+  ERROR_MESSAGE (&loc, _("error"), message);
  complaint_issued = true;
 }

@@ -153,14 +157,14 @@ complain_at_indent (location loc, unsigned *indent,
                    const char *message, ...)
 {
  indent_ptr = indent;
-  ERROR_MESSAGE (&loc, NULL, message);
+  ERROR_MESSAGE (&loc, *indent ? NULL : _("error"), message);
  complaint_issued = true;
 }

 void
 complain (const char *message, ...)
 {
-  ERROR_MESSAGE (NULL, NULL, message);
+  ERROR_MESSAGE (NULL, _("error"), message);
  complaint_issued = true;
 }

@@ -25,6 +25,9 @@
 extern "C" {
 # endif

+/* Sub-messages indent. */
+#define SUB_INDENT (4)
+
 /** Record that a warning is about to be issued, and treat it as an
    error if <tt>warnings_flag & warnings_error</tt>.  This is exported
    only for the sake of Yacc-compatible conflict reports in conflicts.c.
@@ -73,7 +73,7 @@ log_resolution (rule *r, symbol_number token,
 	{
 	case shift_resolution:
 	case right_resolution:
-	  obstack_fgrow2 (&solved_conflicts_obstack,
+	  obstack_printf (&solved_conflicts_obstack,
 			  _("    Conflict between rule %d and token %s"
 			    " resolved as shift"),
 			  r->number,
@@ -82,7 +82,7 @@ log_resolution (rule *r, symbol_number token,

 	case reduce_resolution:
 	case left_resolution:
-	  obstack_fgrow2 (&solved_conflicts_obstack,
+	  obstack_printf (&solved_conflicts_obstack,
 			  _("    Conflict between rule %d and token %s"
 			    " resolved as reduce"),
 			  r->number,
@@ -90,7 +90,7 @@ log_resolution (rule *r, symbol_number token,
 	  break;

 	case nonassoc_resolution:
-	  obstack_fgrow2 (&solved_conflicts_obstack,
+	  obstack_printf (&solved_conflicts_obstack,
 			  _("    Conflict between rule %d and token %s"
 			    " resolved as an error"),
 			  r->number,
@@ -102,33 +102,33 @@ log_resolution (rule *r, symbol_number token,
      switch (resolution)
 	{
 	case shift_resolution:
-	  obstack_fgrow2 (&solved_conflicts_obstack,
+	  obstack_printf (&solved_conflicts_obstack,
 			  " (%s < %s)",
 			  r->prec->tag,
 			  symbols[token]->tag);
 	  break;

 	case reduce_resolution:
-	  obstack_fgrow2 (&solved_conflicts_obstack,
+	  obstack_printf (&solved_conflicts_obstack,
 			  " (%s < %s)",
 			  symbols[token]->tag,
 			  r->prec->tag);
 	  break;

 	case left_resolution:
-	  obstack_fgrow1 (&solved_conflicts_obstack,
+	  obstack_printf (&solved_conflicts_obstack,
 			  " (%%left %s)",
 			  symbols[token]->tag);
 	  break;

 	case right_resolution:
-	  obstack_fgrow1 (&solved_conflicts_obstack,
+	  obstack_printf (&solved_conflicts_obstack,
 			  " (%%right %s)",
 			  symbols[token]->tag);
 	  break;

 	case nonassoc_resolution:
-	  obstack_fgrow1 (&solved_conflicts_obstack,
+	  obstack_printf (&solved_conflicts_obstack,
 			  " (%%nonassoc %s)",
 			  symbols[token]->tag);
 	  break;
@@ -145,7 +145,7 @@ log_resolution (rule *r, symbol_number token,
        {
        case shift_resolution:
        case right_resolution:
-          obstack_fgrow2 (&solved_conflicts_xml_obstack,
+          obstack_printf (&solved_conflicts_xml_obstack,
                          "        <resolution rule=\"%d\" symbol=\"%s\""
                          " type=\"shift\">",
                          r->number,
@@ -154,7 +154,7 @@ log_resolution (rule *r, symbol_number token,

        case reduce_resolution:
        case left_resolution:
-          obstack_fgrow2 (&solved_conflicts_xml_obstack,
+          obstack_printf (&solved_conflicts_xml_obstack,
                          "        <resolution rule=\"%d\" symbol=\"%s\""
                          " type=\"reduce\">",
                          r->number,
@@ -162,7 +162,7 @@ log_resolution (rule *r, symbol_number token,
          break;

        case nonassoc_resolution:
-          obstack_fgrow2 (&solved_conflicts_xml_obstack,
+          obstack_printf (&solved_conflicts_xml_obstack,
                          "        <resolution rule=\"%d\" symbol=\"%s\""
                          " type=\"error\">",
                          r->number,
@@ -174,33 +174,33 @@ log_resolution (rule *r, symbol_number token,
      switch (resolution)
        {
        case shift_resolution:
-          obstack_fgrow2 (&solved_conflicts_xml_obstack,
+          obstack_printf (&solved_conflicts_xml_obstack,
                          "%s &lt; %s",
                          xml_escape_n (0, r->prec->tag),
                          xml_escape_n (1, symbols[token]->tag));
          break;

        case reduce_resolution:
-          obstack_fgrow2 (&solved_conflicts_xml_obstack,
+          obstack_printf (&solved_conflicts_xml_obstack,
                          "%s &lt; %s",
                          xml_escape_n (0, symbols[token]->tag),
                          xml_escape_n (1, r->prec->tag));
          break;

        case left_resolution:
-          obstack_fgrow1 (&solved_conflicts_xml_obstack,
+          obstack_printf (&solved_conflicts_xml_obstack,
                          "%%left %s",
                          xml_escape (symbols[token]->tag));
          break;

        case right_resolution:
-          obstack_fgrow1 (&solved_conflicts_xml_obstack,
+          obstack_printf (&solved_conflicts_xml_obstack,
                          "%%right %s",
                          xml_escape (symbols[token]->tag));
          break;

        case nonassoc_resolution:
-          obstack_fgrow1 (&solved_conflicts_xml_obstack,
+          obstack_printf (&solved_conflicts_xml_obstack,
                          "%%nonassoc %s",
                          xml_escape (symbols[token]->tag));
      break;
@@ -21,20 +21,14 @@
 # error "FLEX_PREFIX not defined"
 #endif

-/* Whether this version of Flex is (strictly) greater than
-   Major.Minor.Subminor.  */
-#define FLEX_VERSION_GT(Major, Minor, Subminor)                         \
-  (defined YY_FLEX_MAJOR_VERSION                                        \
-   && (Major < YY_FLEX_MAJOR_VERSION                                    \
-       || (Major == YY_FLEX_MAJOR_VERSION                               \
-           && (defined YY_FLEX_MINOR_VERSION                            \
-               && (Minor < YY_FLEX_MINOR_VERSION                        \
-                   || (Minor == YY_FLEX_MINOR_VERSION                   \
-                       && defined YY_FLEX_SUBMINOR_VERSION              \
-                       && Subminor < YY_FLEX_SUBMINOR_VERSION))))))
+/* Flex full version as a number.  */
+#define FLEX_VERSION                    \
+  ((YY_FLEX_MAJOR_VERSION) * 1000000    \
+   + (YY_FLEX_MINOR_VERSION) * 1000     \
+   + (YY_FLEX_SUBMINOR_VERSION))

 /* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used.  */
-# if ! FLEX_VERSION_GT (2, 5, 31)
+# if FLEX_VERSION <= 2005031
 int   FLEX_PREFIX (get_lineno) (void);
 FILE *FLEX_PREFIX (get_in) (void);
 FILE *FLEX_PREFIX (get_out) (void);
@@ -65,7 +59,7 @@ int   FLEX_PREFIX (lex_destroy) (void);
   versions according to the Flex manual) leak memory if yylex_destroy is not
   invoked.  However, yylex_destroy is not defined before Flex 2.5.9, so give
   an implementation here that at least appears to work with Flex 2.5.4.  */
-#if ! FLEX_VERSION_GT (2, 5, 9)
+#if FLEX_VERSION <= 2005009
 # define yylex_destroy() yy_delete_buffer (YY_CURRENT_BUFFER)
 #endif

@@ -49,7 +49,7 @@
 #include "quote.h"
 #include "uniqstr.h"

-bool debug_flag;
+bool debug;
 bool defines_flag;
 bool graph_flag;
 bool xml_flag;
@@ -63,6 +63,7 @@ bool error_verbose = false;
 bool nondeterministic_parser = false;
 bool glr_parser = false;

+int feature_flag = feature_none;
 int report_flag = report_none;
 int trace_flag = trace_none;
 int warnings_flag = warnings_conflicts_sr | warnings_conflicts_rr
@@ -257,6 +258,26 @@ static const int warnings_types[] =

 ARGMATCH_VERIFY (warnings_args, warnings_types);

+/*-----------------------.
+| --feature's handling.  |
+`-----------------------*/
+
+static const char * const feature_args[] =
+{
+  "none",
+  "caret", "diagnostics-show-caret",
+  "all",
+  0
+};
+
+static const int feature_types[] =
+{
+  feature_none,
+  feature_caret, feature_caret,
+  feature_all
+};
+
+ARGMATCH_VERIFY (feature_args, feature_types);

 /*-------------------------------------------.
 | Display the help message and exit STATUS.  |
@@ -301,23 +322,24 @@ Operation modes:\n\
      --print-datadir        output directory containing skeletons and XSLT\n\
  -y, --yacc                 emulate POSIX Yacc\n\
  -W, --warnings[=CATEGORY]  report the warnings falling in CATEGORY\n\
+  -f, --feature[=FEATURE]    activate miscellaneous features\n\
 \n\
 "), stdout);

      fputs (_("\
 Parser:\n\
  -L, --language=LANGUAGE          specify the output programming language\n\
-                                   (this is an experimental feature)\n\
  -S, --skeleton=FILE              specify the skeleton to use\n\
  -t, --debug                      instrument the parser for debugging\n\
      --locations                  enable location support\n\
-  -D, --define=NAME[=VALUE]        similar to `%define NAME \"VALUE\"'\n\
-  -F, --force-define=NAME[=VALUE]  override `%define NAME \"VALUE\"'\n\
+  -D, --define=NAME[=VALUE]        similar to '%define NAME \"VALUE\"'\n\
+  -F, --force-define=NAME[=VALUE]  override '%define NAME \"VALUE\"'\n\
  -p, --name-prefix=PREFIX         prepend PREFIX to the external symbols\n\
-  -l, --no-lines                   don't generate `#line' directives\n\
+                                   deprecated by '-Dapi.prefix=PREFIX'\n\
+  -l, --no-lines                   don't generate '#line' directives\n\
  -k, --token-table                include a table of token names\n\
-\n\
 "), stdout);
+      putc ('\n', stdout);

      /* Keep -d and --defines separate so that ../build-aux/cross-options.pl
       * won't assume that -d also takes an argument.  */
@@ -333,8 +355,8 @@ Output:\n\
  -g, --graph[=FILE]         also output a graph of the automaton\n\
  -x, --xml[=FILE]           also output an XML report of the automaton\n\
                             (the XML schema is experimental)\n\
-\n\
 "), stdout);
+      putc ('\n', stdout);

      fputs (_("\
 Warning categories include:\n\
@@ -342,13 +364,14 @@ Warning categories include:\n\
  `yacc'            incompatibilities with POSIX Yacc\n\
  `conflicts-sr'    S/R conflicts (enabled by default)\n\
  `conflicts-rr'    R/R conflicts (enabled by default)\n\
+  `deprecated'      obsolete constructs\n\
  `other'           all other warnings (enabled by default)\n\
  `all'             all the warnings\n\
  `no-CATEGORY'     turn off warnings in CATEGORY\n\
  `none'            turn off all the warnings\n\
  `error'           treat warnings as errors\n\
-\n\
 "), stdout);
+      putc ('\n', stdout);

      fputs (_("\
 THINGS is a list of comma separated words that can include:\n\
@@ -359,8 +382,34 @@ THINGS is a list of comma separated words that can include:\n\
  `all'          include all the above information\n\
  `none'         disable the report\n\
 "), stdout);
+      putc ('\n', stdout);

-      printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
+      fputs (_("\
+FEATURE is a list of comma separated words that can include:\n\
+  `caret'        show errors with carets\n\
+  `all'          all of the above\n\
+  `none'         disable all of the above\n\
+  "), stdout);
+
+      putc ('\n', stdout);
+      printf (_("Report bugs to <%s>.\n"), PACKAGE_BUGREPORT);
+      printf (_("%s home page: <%s>.\n"), PACKAGE_NAME, PACKAGE_URL);
+      fputs (_("General help using GNU software: "
+               "<http://www.gnu.org/gethelp/>.\n"),
+             stdout);
+      /* Don't output this redundant message for English locales.
+         Note we still output for 'C' so that it gets included in the
+         man page.  */
+      const char *lc_messages = setlocale (LC_MESSAGES, NULL);
+      if (lc_messages && strcmp (lc_messages, "en_"))
+        /* TRANSLATORS: Replace LANG_CODE in this URL with your language
+           code <http://translationproject.org/team/LANG_CODE.html> to
+           form one of the URLs at http://translationproject.org/team/.
+           Otherwise, replace the entire URL with your translation team's
+           email address.  */
+        fputs (_("Report translation bugs to "
+                 "<http://translationproject.org/team/>.\n"), stdout);
+      fputs (_("For complete documentation, run: info bison.\n"), stdout);
    }

  exit (status);
@@ -450,6 +499,7 @@ static char const short_options[] =
  "W::"
  "b:"
  "d"
+  "f::"
  "e"
  "g::"
  "h"
@@ -502,6 +552,7 @@ static struct option const long_options[] =

  /* Output.  */
  { "defines",     optional_argument,   0,   'd' },
+  { "feature",     optional_argument,   0,   'f' },

  /* Operation modes.  */
  { "fixed-output-files", no_argument,  0,   'y' },
@@ -536,7 +587,7 @@ command_line_location (void)
 {
  location res;
  /* "<command line>" is used in GCC's messages about -D. */
-  boundary_set (&res.start, uniqstr_new ("<command line>"), optind, -1);
+  boundary_set (&res.start, uniqstr_new ("<command line>"), optind - 1, -1);
  res.end = res.start;
  return res;
 }
@@ -594,6 +645,10 @@ getargs (int argc, char *argv[])
 	version ();
 	exit (EXIT_SUCCESS);

+      case 'f':
+        FLAGS_ARGMATCH (feature, optarg);
+        break;
+
      case 'W':
 	FLAGS_ARGMATCH (warnings, optarg);
 	break;
@@ -645,7 +700,7 @@ getargs (int argc, char *argv[])
 	break;

      case 't':
-	debug_flag = true;
+	debug = true;
 	break;

      case 'v':
@@ -34,7 +34,7 @@ extern int skeleton_prio;
 /* for -I */
 extern char const *include;

-extern bool debug_flag;			/* for -t */
+extern bool debug;			/* for -t */
 extern bool defines_flag;		/* for -d */
 extern bool graph_flag;			/* for -g */
 extern bool xml_flag;			/* for -x */
@@ -130,6 +130,18 @@ enum warnings
 /** What warnings are issued.  */
 extern int warnings_flag;

+/*-------------.
+| --features.  |
+`-------------*/
+
+enum feature
+  {
+    feature_none  = 0,         /**< No additional feature.  */
+    feature_caret = 1 << 0,    /**< Enhance the output of errors with carets.  */
+    feature_all   = ~0         /**< All above features.  */
+  };
+/** What additional features to use.  */
+extern int feature_flag;

 /** Process the command line arguments.
 *
@@ -308,11 +308,16 @@ grammar_rules_useless_report (const char *message)
  for (r = 0; r < nrules ; ++r)
    if (!rules[r].useful)
      {
-        warn_at (rules[r].location, "%s: ", message);
-        if (warnings_flag & warnings_other)
+        if (feature_flag & feature_caret)
+          warn_at (rules[r].location, "%s", message);
+        else
          {
-            rule_print (&rules[r], stderr);
-            fflush (stderr);
+            warn_at (rules[r].location, "%s: ", message);
+            if (warnings_flag & warnings_other)
+              {
+                rule_print (&rules[r], stderr);
+                fflush (stderr);
+              }
          }
      }
 }
@@ -25,12 +25,14 @@
 #include <quotearg.h>

 #include "files.h"
+#include "gram.h"
 #include "graphviz.h"
+#include "tables.h"

 /* Return an unambiguous printable representation for NAME, suitable
   for C strings.  Use slot 2 since the user may use slots 0 and 1.  */

-static char const *
+static char *
 quote (char const *name)
 {
  return quotearg_n_style (2, c_quoting_style, name);
@@ -51,17 +53,21 @@ start_graph (FILE *fout)
           "digraph %s\n"
           "{\n",
           quote (grammar_file));
+  fprintf (fout,
+           "  node [fontname = courier, shape = box, colorscheme = paired6]\n"
+           "  edge [fontname = courier]\n"
+           "\n");
 }

 void
 output_node (int id, char const *label, FILE *fout)
 {
-  fprintf (fout, "  %d [label=%s]\n", id, quote (label));
+  fprintf (fout, "  %d [label=\"%s\"]\n", id, label);
 }

 void
 output_edge (int source, int destination, char const *label,
-	     char const *style, FILE *fout)
+             char const *style, FILE *fout)
 {
  fprintf (fout, "  %d -> %d [style=%s", source, destination, style);
  if (label)
@@ -69,6 +75,142 @@ output_edge (int source, int destination, char const *label,
  fputs ("]\n", fout);
 }

+char const *
+escape (char const *name)
+{
+  char *q = quote (name);
+  q[strlen (q) - 1] = '\0';
+  return q + 1;
+}
+
+static void
+no_reduce_bitset_init (state const *s, bitset *no_reduce_set)
+{
+  int n;
+  *no_reduce_set = bitset_create (ntokens, BITSET_FIXED);
+  bitset_zero (*no_reduce_set);
+  FOR_EACH_SHIFT (s->transitions, n)
+    bitset_set (*no_reduce_set, TRANSITION_SYMBOL (s->transitions, n));
+  for (n = 0; n < s->errs->num; ++n)
+    if (s->errs->symbols[n])
+      bitset_set (*no_reduce_set, s->errs->symbols[n]->number);
+}
+
+static void
+conclude_red (struct obstack *out, int source, rule_number ruleno,
+              bool enabled, bool first, FILE *fout)
+{
+  /* If no lookahead tokens were valid transitions, this reduction is
+     actually hidden, so cancel everything. */
+  if (first)
+    (void) obstack_finish0 (out);
+  else
+    {
+      char const *ed = enabled ? "" : "d";
+      char const *color = enabled ? ruleno ? "3" : "1" : "5";
+
+      /* First, build the edge's head. The name of reduction nodes is "nRm",
+         with n the source state and m the rule number. This is because we
+         don't want all the reductions bearing a same rule number to point to
+         the same state, since that is not the desired format. */
+      fprintf (fout, "  %1$d -> \"%1$dR%2$d%3$s\" [",
+               source, ruleno, ed);
+
+      /* (The lookahead tokens have been added to the beginning of the
+         obstack, in the caller function.) */
+      if (! obstack_empty_p (out))
+        {
+          char *label = obstack_finish0 (out);
+          fprintf (fout, "label=\"[%s]\", ", label);
+          obstack_free (out, label);
+        }
+
+      /* Then, the edge's tail. */
+      fprintf (fout, "style=solid]\n");
+
+      /* Build the associated diamond representation of the target rule. */
+      fprintf (fout, " \"%dR%d%s\" [label=\"",
+               source, ruleno, ed);
+      if (ruleno)
+        fprintf (fout, "R%d", ruleno);
+      else
+        fprintf (fout, "Acc");
+
+      fprintf (fout, "\", fillcolor=%s, shape=diamond, style=filled]\n",
+               color);
+    }
+}
+
+static bool
+print_token (struct obstack *out, bool first, char const *tok)
+{
+  char const *q = escape (tok);
+
+  if (! first)
+    obstack_sgrow (out, ", ");
+  obstack_sgrow (out, q);
+  return false;
+}
+
+void
+output_red (state const *s, reductions const *reds, FILE *fout)
+{
+  bitset no_reduce_set;
+  int j;
+  int source = s->number;
+
+  /* Two obstacks are needed: one for the enabled reductions, and one
+     for the disabled reductions, because in the end we want two
+     separate edges, even though in most cases only one will actually
+     be printed. */
+  struct obstack dout;
+  struct obstack eout;
+
+  no_reduce_bitset_init (s, &no_reduce_set);
+  obstack_init (&dout);
+  obstack_init (&eout);
+
+  for (j = 0; j < reds->num; ++j)
+    {
+      bool defaulted = false;
+      bool firstd = true;
+      bool firste = true;
+      rule_number ruleno = reds->rules[j]->number;
+      rule *default_reduction = NULL;
+
+      if (yydefact[s->number] != 0)
+        default_reduction = &rules[yydefact[s->number] - 1];
+
+      /* Build the lookahead tokens lists, one for enabled transitions and one
+         for disabled transistions. */
+      if (default_reduction && default_reduction == reds->rules[j])
+        defaulted = true;
+      if (reds->lookahead_tokens)
+        {
+          int i;
+          for (i = 0; i < ntokens; i++)
+            if (bitset_test (reds->lookahead_tokens[j], i))
+              {
+                if (bitset_test (no_reduce_set, i))
+                  firstd = print_token (&dout, firstd, symbols[i]->tag);
+                else
+                  {
+                    if (! defaulted)
+                      firste = print_token (&eout, firste, symbols[i]->tag);
+                    bitset_set (no_reduce_set, i);
+                  }
+              }
+        }
+
+      /* Do the actual output. */
+      conclude_red (&dout, source, ruleno, false, firstd, fout);
+      conclude_red (&eout, source, ruleno, true, firste && !defaulted, fout);
+    }
+  obstack_free (&dout, 0);
+  obstack_free (&eout, 0);
+  bitset_free (no_reduce_set);
+}
+
 void
 finish_graph (FILE *fout)
 {
@@ -22,6 +22,8 @@
 #ifndef GRAPHVIZ_H_
 # define GRAPHVIZ_H_

+#include "state.h"
+
 /// Begin a Dot graph.
 /// \param fout   output stream.
 void start_graph (FILE *fout);
@@ -40,10 +42,20 @@ void output_node (int id, char const *label, FILE *fout);
 /// \param style        Dot style of the edge (e.g., "dotted" or "solid").
 /// \param fout         output stream.
 void output_edge (int source, int destination, char const *label,
-		  char const *style, FILE *fout);
+                  char const *style, FILE *fout);
+
+/// Output a reduction.
+/// \param s            current state
+/// \param reds         the set of reductions
+/// \param fout         output stream.
+void output_red (state const *s, reductions const *reds, FILE *fout);

 /// End a Dot graph.
 /// \param fout  output stream.
 void finish_graph (FILE *fout);

+/// Escape a lookahead token.
+/// \param name         the token.
+char const *escape (char const *name);
+
 #endif /* ! GRAPHVIZ_H_ */
@@ -107,7 +107,7 @@ location_print (FILE *out, location loc)
                  quotearg_n_style (3, escape_quoting_style, loc.start.file));
  if (0 <= loc.start.line)
    {
-      res += fprintf(out, ":%d", loc.start.line);
+      res += fprintf (out, ":%d", loc.start.line);
      if (0 <= loc.start.column)
        res += fprintf (out, ".%d", loc.start.column);
    }
@@ -118,7 +118,7 @@ location_print (FILE *out, location loc)
                                        loc.end.file));
      if (0 <= loc.end.line)
        {
-          res += fprintf(out, ":%d", loc.end.line);
+          res += fprintf (out, ":%d", loc.end.line);
          if (0 <= end_col)
            res += fprintf (out, ".%d", end_col);
        }
@@ -138,6 +138,81 @@ location_print (FILE *out, location loc)
  return res;
 }

+
+/* Persistant data used by location_caret to avoid reopening and rereading the
+   same file all over for each error.  */
+struct caret_info
+{
+  FILE *source;
+  size_t line;
+  size_t offset;
+};
+
+static struct caret_info caret_info = { NULL, 1, 0 };
+
+void
+cleanup_caret ()
+{
+  if (caret_info.source)
+    fclose (caret_info.source);
+}
+
+void
+location_caret (FILE *out, location loc)
+{
+  /* FIXME: find a way to support multifile locations, and only open once each
+     file. That would make the procedure future-proof.  */
+  if (! (caret_info.source
+         || (caret_info.source = fopen (loc.start.file, "r")))
+      || loc.start.column == -1 || loc.start.line == -1)
+    return;
+
+  /* If the line we want to quote is seekable (the same line as the previous
+     location), just seek it. If it was before, we lost track of it, so
+     return to the start of file.  */
+  if (caret_info.line <= loc.start.line)
+    fseek (caret_info.source, caret_info.offset, SEEK_SET);
+  else
+    {
+      caret_info.line = 1;
+      caret_info.offset = 0;
+      fseek (caret_info.source, caret_info.offset, SEEK_SET);
+    }
+
+  /* Advance to the line's position, keeping track of the offset.  */
+  while (caret_info.line < loc.start.line)
+    caret_info.line += fgetc (caret_info.source) == '\n';
+  caret_info.offset = ftell (caret_info.source);
+
+  /* Read the actual line.  Don't update the offset, so that we keep a pointer
+     to the start of the line.  */
+  {
+    char *buf = NULL;
+    size_t size = 0;
+    ssize_t len = getline (&buf, &size, caret_info.source);
+    if (0 < len)
+      {
+        /* The caret of a multiline location ends with the first line.  */
+        int end = loc.start.line != loc.end.line ? len : loc.end.column;
+
+        /* Quote the file, indent by a single column.  */
+        fputc (' ', out);
+        fwrite (buf, 1, len, out);
+
+        /* Print the caret, with the same indent as above.  */
+        fprintf (out, " %*s", loc.start.column - 1, "");
+        {
+          int i = loc.start.column;
+          do
+            fputc ('^', out);
+          while (++i < end);
+        }
+        fputc ('\n', out);
+      }
+    free (buf);
+  }
+}
+
 void
 boundary_set_from_string (boundary *bound, char *loc_str)
 {
@@ -88,7 +88,7 @@ typedef struct

 } location;

-#define YYLTYPE location
+#define GRAM_LTYPE location

 #define EMPTY_LOCATION_INIT {{NULL, 0, 0}, {NULL, 0, 0}}
 extern location const empty_location;
@@ -102,6 +102,13 @@ void location_compute (location *loc,
   characters.  */
 unsigned location_print (FILE *out, location loc);

+/* Free any allocated ressources and close any open file handles that are
+   left-over by the usage of location_caret.  */
+void cleanup_caret (void);
+
+/* Output to OUT the line and caret corresponding to location LOC.  */
+void location_caret (FILE *out, location loc);
+
 /* Return -1, 0, 1, depending whether a is before, equal, or
   after b.  */
 static inline int
@@ -216,5 +216,7 @@ main (int argc, char *argv[])
  timevar_stop (TV_TOTAL);
  timevar_print (stderr);

+  cleanup_caret ();
+
  return complaint_issued ? EXIT_FAILURE : EXIT_SUCCESS;
 }
@@ -177,10 +177,10 @@ static void
 muscle_syncline_grow (char const *key, location loc)
 {
  char *extension = NULL;
-  obstack_fgrow1 (&muscle_obstack, "]b4_syncline(%d, [[", loc.start.line);
-  MUSCLE_OBSTACK_SGROW (&muscle_obstack,
-			quotearg_style (c_quoting_style, loc.start.file));
-  obstack_sgrow (&muscle_obstack, "]])[");
+  obstack_printf (&muscle_obstack, "]b4_syncline(%d, ", loc.start.line);
+  obstack_quote (&muscle_obstack,
+                 quotearg_style (c_quoting_style, loc.start.file));
+  obstack_sgrow (&muscle_obstack, ")[");
  obstack_1grow (&muscle_obstack, 0);
  extension = obstack_finish (&muscle_obstack);
  muscle_grow (key, extension, "");
@@ -205,11 +205,11 @@ void muscle_pair_list_grow (const char *muscle,
 			    const char *a1, const char *a2)
 {
  char *pair;
-  obstack_sgrow (&muscle_obstack, "[[[");
-  MUSCLE_OBSTACK_SGROW (&muscle_obstack, a1);
-  obstack_sgrow (&muscle_obstack, "]], [[");
-  MUSCLE_OBSTACK_SGROW (&muscle_obstack, a2);
-  obstack_sgrow (&muscle_obstack, "]]]");
+  obstack_sgrow (&muscle_obstack, "[");
+  obstack_quote (&muscle_obstack, a1);
+  obstack_sgrow (&muscle_obstack, ", ");
+  obstack_quote (&muscle_obstack, a2);
+  obstack_sgrow (&muscle_obstack, "]");
  obstack_1grow (&muscle_obstack, 0);
  pair = obstack_finish (&muscle_obstack);
  muscle_grow (muscle, pair, ",\n");
@@ -259,53 +259,61 @@ muscle_find (char const *key)
 }


-void
+/* In the format `file_name:line.column', append BOUND to MUSCLE.  Use
+   digraphs for special characters in the file name.  */
+
+static void
 muscle_boundary_grow (char const *key, boundary bound)
 {
  char *extension;
-  MUSCLE_OBSTACK_SGROW (&muscle_obstack, bound.file);
-  obstack_1grow (&muscle_obstack, ':');
-  obstack_fgrow1 (&muscle_obstack, "%d", bound.line);
-  obstack_1grow (&muscle_obstack, '.');
-  obstack_fgrow1 (&muscle_obstack, "%d", bound.column);
-  obstack_1grow (&muscle_obstack, '\0');
+  obstack_sgrow  (&muscle_obstack, "[[");
+  obstack_escape (&muscle_obstack, bound.file);
+  obstack_1grow  (&muscle_obstack, ':');
+  obstack_printf (&muscle_obstack, "%d", bound.line);
+  obstack_1grow  (&muscle_obstack, '.');
+  obstack_printf (&muscle_obstack, "%d", bound.column);
+  obstack_sgrow  (&muscle_obstack, "]]");
+  obstack_1grow  (&muscle_obstack, '\0');
  extension = obstack_finish (&muscle_obstack);
  muscle_grow (key, extension, "");
  obstack_free (&muscle_obstack, extension);
 }

-void
+
+/* In the format `[[file_name:line.column]], [[file_name:line.column]]',
+   append LOC to MUSCLE.  Use digraphs for special characters in each
+   file name.  */
+
+static void
 muscle_location_grow (char const *key, location loc)
 {
-  muscle_grow (key, "[[", "");
  muscle_boundary_grow (key, loc.start);
-  muscle_grow (key, "]], [[", "");
+  muscle_grow (key, "", ", ");
  muscle_boundary_grow (key, loc.end);
-  muscle_grow (key, "]]", "");
 }

-#define MUSCLE_COMMON_DECODE(Value)                                           \
-  case '$':                                                                   \
-    aver (*++(Value) == ']');                                                 \
-    aver (*++(Value) == '[');                                                 \
-    obstack_sgrow (&muscle_obstack, "$");                                     \
-    break;                                                                    \
-  case '@':                                                                   \
-    switch (*++(Value))                                                       \
-      {                                                                       \
-        case '@': obstack_sgrow (&muscle_obstack, "@" ); break;               \
-        case '{': obstack_sgrow (&muscle_obstack, "[" ); break;               \
-        case '}': obstack_sgrow (&muscle_obstack, "]" ); break;               \
-        default: aver (false); break;                                         \
-      }                                                                       \
-    break;                                                                    \
-  default:                                                                    \
-    obstack_1grow (&muscle_obstack, *(Value));                                \
+#define COMMON_DECODE(Value)                                    \
+  case '$':                                                     \
+    aver (*++(Value) == ']');                                   \
+    aver (*++(Value) == '[');                                   \
+    obstack_sgrow (&muscle_obstack, "$");                       \
+    break;                                                      \
+  case '@':                                                     \
+    switch (*++(Value))                                         \
+      {                                                         \
+        case '@': obstack_sgrow (&muscle_obstack, "@" ); break; \
+        case '{': obstack_sgrow (&muscle_obstack, "[" ); break; \
+        case '}': obstack_sgrow (&muscle_obstack, "]" ); break; \
+        default: aver (false); break;                           \
+      }                                                         \
+    break;                                                      \
+  default:                                                      \
+    obstack_1grow (&muscle_obstack, *(Value));                  \
    break;

-/* Reverse of MUSCLE_OBSTACK_SGROW.  */
+/* Reverse of obstack_escape.  */
 static char *
-muscle_string_decode (char const *key)
+string_decode (char const *key)
 {
  char const *value;
  char *value_decoded;
@@ -317,7 +325,7 @@ muscle_string_decode (char const *key)
  do {
    switch (*value)
      {
-        MUSCLE_COMMON_DECODE (value)
+        COMMON_DECODE (value)
        case '[':
        case ']':
          aver (false);
@@ -332,7 +340,7 @@ muscle_string_decode (char const *key)

 /* Reverse of muscle_location_grow.  */
 static location
-muscle_location_decode (char const *key)
+location_decode (char const *key)
 {
  location loc;
  char const *value = muscle_find_const (key);
@@ -342,7 +350,7 @@ muscle_location_decode (char const *key)
  while (*++value)
    switch (*value)
      {
-        MUSCLE_COMMON_DECODE (value)
+        COMMON_DECODE (value)
        case '[':
          aver (false);
          break;
@@ -388,47 +396,61 @@ muscle_user_name_list_grow (char const *key, char const *user_name,
  muscle_grow (key, "]]", "");
 }

+/** If the \a variable name is obsolete, return the name to use,
+ * otherwise \a variable. */
+static
+char const *
+muscle_percent_variable_update (char const *variable)
+{
+  typedef struct
+  {
+    const char *obsolete;
+    const char *updated;
+  } conversion_type;
+  const conversion_type conversion[] =
+    {
+      { "api.push_pull", "api.push-pull", },
+      { "location_type", "api.location.type", },
+      { "lr.keep_unreachable_states", "lr.keep-unreachable-states", },
+    };
+  char const *res = variable;
+  int i;
+  for (i = 0; i < ARRAY_CARDINALITY (conversion); ++i)
+    if (STREQ (conversion[i].obsolete, variable))
+      {
+        res = conversion[i].updated;
+        break;
+      }
+  return res;
+}
+
 void
-muscle_percent_define_insert (char const *variable, location variable_loc,
+muscle_percent_define_insert (char const *var, location variable_loc,
                              char const *value,
                              muscle_percent_define_how how)
 {
-  char *variable_tr = NULL;
-  char const *name;
-  char const *loc_name;
-  char const *syncline_name;
-  char const *how_name;
-
-  /* Permit certain names with underscores for backward compatibility.  */
-  if (0 == strcmp (variable, "api.push_pull")
-      || 0 == strcmp (variable, "lr.keep_unreachable_states"))
-    {
-      variable_tr = strdup (variable);
-      tr (variable_tr, '_', '-');
-      variable = variable_tr;
-    }
-
-  name = UNIQSTR_CONCAT ("percent_define(", variable, ")");
-  loc_name = UNIQSTR_CONCAT ("percent_define_loc(", variable, ")");
-  syncline_name =
+  /* Backward compatibility.  */
+  char const *variable = muscle_percent_variable_update (var);
+  char const *name = UNIQSTR_CONCAT ("percent_define(", variable, ")");
+  char const *loc_name = UNIQSTR_CONCAT ("percent_define_loc(", variable, ")");
+  char const *syncline_name =
    UNIQSTR_CONCAT ("percent_define_syncline(", variable, ")");
-  how_name = UNIQSTR_CONCAT ("percent_define_how(", variable, ")");
+  char const *how_name = UNIQSTR_CONCAT ("percent_define_how(", variable, ")");

  /* Command-line options are processed before the grammar file.  */
  if (how == MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE
      && muscle_find_const (name))
    {
+      unsigned i = 0;
      muscle_percent_define_how how_old =
        atoi (muscle_find_const (how_name));
      if (how_old == MUSCLE_PERCENT_DEFINE_F)
-        {
-          free (variable_tr);
-          return;
-        }
-      complain_at (variable_loc, _("%%define variable %s redefined"),
-                   quote (variable));
-      complain_at (muscle_percent_define_get_loc (variable),
-                   _("previous definition"));
+        return;
+      complain_at_indent (variable_loc, &i,
+                          _("%%define variable %s redefined"), quote (variable));
+      i += SUB_INDENT;
+      complain_at_indent (muscle_percent_define_get_loc (variable), &i,
+                          _("previous definition"));
    }

  MUSCLE_INSERT_STRING (name, value);
@@ -439,8 +461,6 @@ muscle_percent_define_insert (char const *variable, location variable_loc,
  muscle_user_name_list_grow ("percent_define_user_variables", variable,
                              variable_loc);
  MUSCLE_INSERT_INT (how_name, how);
-
-  free (variable_tr);
 }

 char *
@@ -455,7 +475,7 @@ muscle_percent_define_get (char const *variable)
                               variable, ")");

  muscle_insert (usage_name, "");
-  value = muscle_string_decode (name);
+  value = string_decode (name);
  if (!value)
    value = xstrdup ("");
  return value;
@@ -469,7 +489,7 @@ muscle_percent_define_get_loc (char const *variable)
  if (!muscle_find_const (loc_name))
    fatal(_("%s: undefined %%define variable %s"),
          "muscle_percent_define_get_loc", quote (variable));
-  return muscle_location_decode (loc_name);
+  return location_decode (loc_name);
 }

 char const *
@@ -573,7 +593,7 @@ muscle_percent_define_check_values (char const * const *values)

      name = UNIQSTR_CONCAT ("percent_define(", *variablep, ")");

-      value = muscle_string_decode (name);
+      value = string_decode (name);
      if (value)
        {
          for (++values; *values; ++values)
@@ -583,12 +603,15 @@ muscle_percent_define_check_values (char const * const *values)
            }
          if (!*values)
            {
+              unsigned i = 0;
              location loc = muscle_percent_define_get_loc (*variablep);
-              complain_at(loc,
-                          _("invalid value for %%define variable %s: %s"),
-                          quote (*variablep), quote_n (1, value));
+              complain_at_indent (loc, &i,
+                                _("invalid value for %%define variable %s: %s"),
+                                  quote (*variablep), quote_n (1, value));
+              i += SUB_INDENT;
              for (values = variablep + 1; *values; ++values)
-                complain_at (loc, _("accepted value: %s"), quote (*values));
+                complain_at_indent (loc, &i, _("accepted value: %s"),
+                                    quote (*values));
            }
          else
            {
@@ -35,62 +35,47 @@ void muscle_free (void);
 /* An obstack dedicated to receive muscle keys and values.  */
 extern struct obstack muscle_obstack;

-#define MUSCLE_INSERT_BOOL(Key, Value)				\
-do {								\
-  int v = Value;						\
-  MUSCLE_INSERT_INT (Key, v);					\
-} while(0)
+#define MUSCLE_INSERT_BOOL(Key, Value)                          \
+  do {                                                          \
+    int v = Value;                                              \
+    MUSCLE_INSERT_INT (Key, v);                                 \
+  } while (0)

-#define MUSCLE_INSERT_INT(Key, Value)				\
-do {								\
-  obstack_fgrow1 (&muscle_obstack, "%d", Value);		\
-  obstack_1grow (&muscle_obstack, 0);				\
-  muscle_insert (Key, obstack_finish (&muscle_obstack));	\
-} while(0)
+#define MUSCLE_INSERT_INT(Key, Value)                           \
+  do {                                                          \
+    obstack_printf (&muscle_obstack, "%d", Value);              \
+    obstack_1grow (&muscle_obstack, 0);                         \
+    muscle_insert (Key, obstack_finish (&muscle_obstack));      \
+  } while (0)

-#define MUSCLE_INSERT_LONG_INT(Key, Value)			\
-do {								\
-  obstack_fgrow1 (&muscle_obstack, "%ld", Value);		\
-  obstack_1grow (&muscle_obstack, 0);				\
-  muscle_insert (Key, obstack_finish (&muscle_obstack));	\
-} while(0)
+#define MUSCLE_INSERT_LONG_INT(Key, Value)                      \
+  do {                                                          \
+    obstack_printf (&muscle_obstack, "%ld", Value);             \
+    obstack_1grow (&muscle_obstack, 0);                         \
+    muscle_insert (Key, obstack_finish (&muscle_obstack));      \
+  } while (0)

-#define MUSCLE_INSERT_STRING_RAW(Key, Value)			\
-do {								\
-  obstack_sgrow (&muscle_obstack, Value);			\
-  obstack_1grow (&muscle_obstack, 0);				\
-  muscle_insert (Key, obstack_finish (&muscle_obstack));	\
-} while(0)
+#define MUSCLE_INSERT_STRING_RAW(Key, Value)                    \
+  do {                                                          \
+    obstack_sgrow (&muscle_obstack, Value);                     \
+    obstack_1grow (&muscle_obstack, 0);                         \
+    muscle_insert (Key, obstack_finish (&muscle_obstack));      \
+  } while (0)

-#define MUSCLE_INSERT_STRING(Key, Value)			\
-do {								\
-  MUSCLE_OBSTACK_SGROW (&muscle_obstack, Value);                \
-  obstack_1grow (&muscle_obstack, 0);				\
-  muscle_insert (Key, obstack_finish (&muscle_obstack));	\
-} while(0)
+#define MUSCLE_INSERT_STRING(Key, Value)                        \
+  do {                                                          \
+    obstack_escape (&muscle_obstack, Value);                    \
+    obstack_1grow (&muscle_obstack, 0);                         \
+    muscle_insert (Key, obstack_finish (&muscle_obstack));      \
+  } while (0)

-#define MUSCLE_OBSTACK_SGROW(Obstack, Value)			\
-do {								\
-  char const *p;						\
-  for (p = Value; *p; p++)					\
-    switch (*p)							\
-      {								\
-      case '$':	obstack_sgrow (Obstack, "$]["); break;		\
-      case '@':	obstack_sgrow (Obstack, "@@" ); break;		\
-      case '[':	obstack_sgrow (Obstack, "@{" ); break;		\
-      case ']':	obstack_sgrow (Obstack, "@}" ); break;		\
-      default: obstack_1grow (Obstack, *p); break;		\
-      }								\
-} while(0)
-
-#define MUSCLE_INSERT_C_STRING(Key, Value)			\
-do {								\
-  MUSCLE_OBSTACK_SGROW (&muscle_obstack,			\
-			quotearg_style (c_quoting_style,	\
-					Value));		\
-  obstack_1grow (&muscle_obstack, 0);				\
-  muscle_insert (Key, obstack_finish (&muscle_obstack));	\
-} while(0)
+#define MUSCLE_INSERT_C_STRING(Key, Value)                      \
+  do {                                                          \
+    obstack_escape (&muscle_obstack,                            \
+                    quotearg_style (c_quoting_style, Value));   \
+    obstack_1grow (&muscle_obstack, 0);                         \
+    muscle_insert (Key, obstack_finish (&muscle_obstack));      \
+  } while (0)

 /* Append VALUE to the current value of KEY.  If KEY did not already
   exist, create it.  Use MUSCLE_OBSTACK.  De-allocate the previously
@@ -110,15 +95,7 @@ void muscle_code_grow (const char *key, const char *value, location loc);
   muscle values are output *double* quoted, one needs to strip the first level
   of quotes to reach the list itself.  */
 void muscle_pair_list_grow (const char *muscle,
-			    const char *a1, const char *a2);
-
-/* In the format `[[file_name:line.column]], [[file_name:line.column]]', append
-   LOC to MUSCLE.  Use digraphs for special characters in each file name.  */
-void muscle_location_grow (char const *key, location loc);
-
-/* In the format `file_name:line.column', append BOUND to MUSCLE.  Use digraphs
-   for special characters in the file name.  */
-void muscle_boundary_grow (char const *key, boundary bound);
+                            const char *a1, const char *a2);

 /* Grow KEY for the occurrence of the name USER_NAME at LOC appropriately for
   use with b4_check_user_names in ../data/bison.m4.  USER_NAME is not escaped
@@ -41,8 +41,6 @@
 #include "symtab.h"
 #include "tables.h"

-# define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array))
-
 static struct obstack format_obstack;


@@ -70,7 +68,7 @@ Name (char const *name,							\
  int i;								\
  int j = 1;								\
 									\
-  obstack_fgrow1 (&format_obstack, "%6d", first);			\
+  obstack_printf (&format_obstack, "%6d", first);			\
  for (i = begin; i < end; ++i)						\
    {									\
      obstack_1grow (&format_obstack, ',');				\
@@ -81,7 +79,7 @@ Name (char const *name,							\
 	}								\
      else								\
 	++j;								\
-      obstack_fgrow1 (&format_obstack, "%6d", table_data[i]);		\
+      obstack_printf (&format_obstack, "%6d", table_data[i]);		\
      if (table_data[i] < min)						\
 	min = table_data[i];						\
      if (max < table_data[i])						\
@@ -93,10 +91,10 @@ Name (char const *name,							\
  lmin = min;								\
  lmax = max;								\
  /* Build `NAME_min' and `NAME_max' in the obstack. */			\
-  obstack_fgrow1 (&format_obstack, "%s_min", name);			\
+  obstack_printf (&format_obstack, "%s_min", name);			\
  obstack_1grow (&format_obstack, 0);					\
  MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), lmin);	\
-  obstack_fgrow1 (&format_obstack, "%s_max", name);			\
+  obstack_printf (&format_obstack, "%s_max", name);			\
  obstack_1grow (&format_obstack, 0);					\
  MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), lmax);	\
 }
@@ -110,29 +108,39 @@ GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_item_number_table, item_number)
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_state_number_table, state_number)


-/*--------------------------------------------------------------------.
-| Print to OUT a representation of STRING escaped both for C and M4.  |
-`--------------------------------------------------------------------*/
+/*----------------------------------------------------------------.
+| Print to OUT a representation of CP quoted and escaped for M4.  |
+`----------------------------------------------------------------*/

 static void
-escaped_output (FILE *out, char const *string)
+quoted_output (FILE *out, char const *cp)
 {
-  char const *p;
  fprintf (out, "[[");

-  for (p = quotearg_style (c_quoting_style, string); *p; p++)
-    switch (*p)
+  for (; *cp; cp++)
+    switch (*cp)
      {
      case '$': fputs ("$][", out); break;
      case '@': fputs ("@@",  out); break;
      case '[': fputs ("@{",  out); break;
      case ']': fputs ("@}",  out); break;
-      default: fputc (*p, out); break;
+      default:  fputc (*cp,   out); break;
      }

  fprintf (out, "]]");
 }

+/*----------------------------------------------------------------.
+| Print to OUT a representation of STRING quoted and escaped both |
+| for C and M4.                                                   |
+`----------------------------------------------------------------*/
+
+static void
+string_output (FILE *out, char const *string)
+{
+  quoted_output (out, quotearg_style (c_quoting_style, string));
+}
+

 /*------------------------------------------------------------------.
 | Prepare the muscles related to the symbols: translate, tname, and |
@@ -142,7 +150,6 @@ escaped_output (FILE *out, char const *string)
 static void
 prepare_symbols (void)
 {
-  MUSCLE_INSERT_BOOL ("token_table", token_table_flag);
  MUSCLE_INSERT_INT ("tokens_number", ntokens);
  MUSCLE_INSERT_INT ("nterms_number", nvars);
  MUSCLE_INSERT_INT ("undef_token_number", undeftoken->number);
@@ -176,7 +183,7 @@ prepare_symbols (void)

 	if (i)
 	  obstack_1grow (&format_obstack, ' ');
-	MUSCLE_OBSTACK_SGROW (&format_obstack, cp);
+	obstack_escape (&format_obstack, cp);
        free (cp);
 	obstack_1grow (&format_obstack, ',');
 	j += width;
@@ -300,7 +307,7 @@ user_actions_output (FILE *out)
      {
 	fprintf (out, "b4_case(%d, [b4_syncline(%d, ", r + 1,
 		 rules[r].action_location.start.line);
-	escaped_output (out, rules[r].action_location.start.file);
+	string_output (out, rules[r].action_location.start.file);
 	fprintf (out, ")\n[    %s]])\n\n", rules[r].action);
      }
  fputs ("])\n\n", out);
@@ -406,12 +413,15 @@ symbol_code_props_output (FILE *out, char const *what,
             code, optional typename.  */
          fprintf (out, "%s[", sep);
          sep = ",\n";
-          escaped_output (out, loc.start.file);
+          string_output (out, loc.start.file);
          fprintf (out, ", %d, ", loc.start.line);
-          escaped_output (out, sym->tag);
+          quoted_output (out, sym->tag);
          fprintf (out, ", %d, [[%s]]", sym->number, code);
          if (sym->type_name)
-            fprintf (out, ", [[%s]]", sym->type_name);
+            {
+              fputs (", ", out);
+              quoted_output (out, sym->type_name);
+            }
          fputc (']', out);
        }
    }
@@ -616,7 +626,7 @@ prepare (void)
    use_push_for_pull_flag = true;

  /* Flags. */
-  MUSCLE_INSERT_BOOL ("debug_flag", debug_flag);
+  MUSCLE_INSERT_BOOL ("debug_flag", debug);
  MUSCLE_INSERT_BOOL ("defines_flag", defines_flag);
  MUSCLE_INSERT_BOOL ("error_verbose_flag", error_verbose);
  MUSCLE_INSERT_BOOL ("glr_flag", glr_parser);
@@ -624,6 +634,7 @@ prepare (void)
  MUSCLE_INSERT_BOOL ("nondeterministic_flag", nondeterministic_parser);
  MUSCLE_INSERT_BOOL ("synclines_flag", !no_lines_flag);
  MUSCLE_INSERT_BOOL ("tag_seen_flag", tag_seen);
+  MUSCLE_INSERT_BOOL ("token_table_flag", token_table_flag);
  MUSCLE_INSERT_BOOL ("use_push_for_pull_flag", use_push_for_pull_flag);
  MUSCLE_INSERT_BOOL ("yacc_flag", yacc_flag);

@@ -1,4 +1,4 @@
-/* A Bison parser, made by GNU Bison 2.5.1_rc2.  */
+/* A Bison parser, made by GNU Bison 2.6.5.63-3ada.  */

 /* Bison interface for Yacc-like parsers in C
   
@@ -30,13 +30,30 @@
   This special exception was added by the Free Software Foundation in
   version 2.2 of Bison.  */

+#ifndef YY_GRAM__________SRC_PARSE_GRAM_H_INCLUDED
+# define YY_GRAM__________SRC_PARSE_GRAM_H_INCLUDED
+/* Enabling traces.  */
+#ifndef GRAM_DEBUG
+# if defined YYDEBUG
+#  if YYDEBUG
+#   define GRAM_DEBUG 1
+#  else
+#   define GRAM_DEBUG 0
+#  endif
+# else /* ! defined YYDEBUG */
+#  define GRAM_DEBUG 1
+# endif /* ! defined YYDEBUG */
+#endif  /* ! defined GRAM_DEBUG */
+#if GRAM_DEBUG
+extern int gram_debug;
+#endif

 /* Tokens.  */
-#ifndef YYTOKENTYPE
-# define YYTOKENTYPE
+#ifndef GRAM_TOKENTYPE
+# define GRAM_TOKENTYPE
   /* Put the tokens into the symbol table, so that GDB and other debuggers
      know about them.  */
-   enum yytokentype {
+   enum gram_tokentype {
     GRAM_EOF = 0,
     STRING = 258,
     INT = 259,
@@ -155,13 +172,11 @@



-
-#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
-typedef union YYSTYPE
+#if ! defined GRAM_STYPE && ! defined GRAM_STYPE_IS_DECLARED
+typedef union GRAM_STYPE
 {
-
-/* Line 2072 of yacc.c  */
-#line 114 "parse-gram.y"
+/* Line 2042 of yacc.c  */
+#line 115 "parse-gram.y"

  symbol *symbol;
  symbol_list *list;
@@ -174,29 +189,40 @@ typedef union YYSTYPE
  named_ref *named_ref;


-
-/* Line 2072 of yacc.c  */
-#line 180 "parse-gram.h"
-} YYSTYPE;
-# define YYSTYPE_IS_TRIVIAL 1
-# define yystype YYSTYPE /* obsolescent; will be withdrawn */
-# define YYSTYPE_IS_DECLARED 1
+/* Line 2042 of yacc.c  */
+#line 194 "parse-gram.h"
+} GRAM_STYPE;
+# define GRAM_STYPE_IS_TRIVIAL 1
+# define gram_stype GRAM_STYPE /* obsolescent; will be withdrawn */
+# define GRAM_STYPE_IS_DECLARED 1
 #endif

-
-
-#if ! defined YYLTYPE && ! defined YYLTYPE_IS_DECLARED
-typedef struct YYLTYPE
+#if ! defined GRAM_LTYPE && ! defined GRAM_LTYPE_IS_DECLARED
+typedef struct GRAM_LTYPE
 {
  int first_line;
  int first_column;
  int last_line;
  int last_column;
-} YYLTYPE;
-# define yyltype YYLTYPE /* obsolescent; will be withdrawn */
-# define YYLTYPE_IS_DECLARED 1
-# define YYLTYPE_IS_TRIVIAL 1
+} GRAM_LTYPE;
+# define gram_ltype GRAM_LTYPE /* obsolescent; will be withdrawn */
+# define GRAM_LTYPE_IS_DECLARED 1
+# define GRAM_LTYPE_IS_TRIVIAL 1
 #endif


+#ifdef YYPARSE_PARAM
+#if defined __STDC__ || defined __cplusplus
+int gram_parse (void *YYPARSE_PARAM);
+#else
+int gram_parse ();
+#endif
+#else /* ! YYPARSE_PARAM */
+#if defined __STDC__ || defined __cplusplus
+int gram_parse (void);
+#else
+int gram_parse ();
+#endif
+#endif /* ! YYPARSE_PARAM */

+#endif /* !YY_GRAM__________SRC_PARSE_GRAM_H_INCLUDED  */
@@ -20,6 +20,7 @@
 #include <config.h>
 #include "system.h"

+#include "c-ctype.h"
 #include "complain.h"
 #include "conflicts.h"
 #include "files.h"
@@ -93,14 +94,14 @@ current_lhs(symbol *sym, location loc, named_ref *ref)
 %}

 %debug
-%verbose
-%defines
-%locations
-%pure-parser
-%error-verbose
+%define api.prefix "gram_"
+%define api.pure
 %define parse.lac full
-%name-prefix="gram_"
+%defines
+%error-verbose
 %expect 0
+%locations
+%verbose

 %initial-action
 {
@@ -251,7 +252,7 @@ prologue_declaration:
                        plain_code.code, @1);
      code_scanner_last_string_free ();
    }
-| "%debug"                         { debug_flag = true; }
+| "%debug"                         { debug = true; }
 | "%define" variable content.opt
    {
      muscle_percent_define_insert ($2, @2, $3,
@@ -347,17 +348,27 @@ grammar_declaration:
    }
 | "%destructor" "{...}" generic_symlist
    {
-      symbol_list *list;
-      for (list = $3; list; list = list->next)
-	symbol_list_destructor_set (list, $2, @2);
-      symbol_list_free ($3);
+      code_props code;
+      code_props_symbol_action_init (&code, $2, @2);
+      code_props_translate_code (&code);
+      {
+        symbol_list *list;
+        for (list = $3; list; list = list->next)
+          symbol_list_destructor_set (list, &code);
+        symbol_list_free ($3);
+      }
    }
 | "%printer" "{...}" generic_symlist
    {
-      symbol_list *list;
-      for (list = $3; list; list = list->next)
-	symbol_list_printer_set (list, $2, @2);
-      symbol_list_free ($3);
+      code_props code;
+      code_props_symbol_action_init (&code, $2, @2);
+      code_props_translate_code (&code);
+      {
+        symbol_list *list;
+        for (list = $3; list; list = list->next)
+          symbol_list_printer_set (list, &code);
+        symbol_list_free ($3);
+      }
    }
 | "%default-prec"
    {
@@ -724,11 +735,13 @@ add_param (char const *type, char *decl, location loc)

  /* Strip the surrounding '{' and '}', and any blanks just inside
     the braces.  */
-  while (*--p == ' ' || *p == '\t')
-    continue;
+  --p;
+  while (c_isspace ((unsigned char) *p))
+    --p;
  p[1] = '\0';
-  while (*++decl == ' ' || *decl == '\t')
-    continue;
+  ++decl;
+  while (c_isspace ((unsigned char) *decl))
+    ++decl;

  if (! name_start)
    complain_at (loc, _("missing identifier in parameter declaration"));
@@ -370,7 +370,7 @@ static void
 print_state (FILE *out, state *s)
 {
  fputs ("\n\n", out);
-  fprintf (out, _("state %d"), s->number);
+  fprintf (out, _("State %d"), s->number);
  fputc ('\n', out);
  print_core (out, s);
  print_actions (out, s);
@@ -39,11 +39,32 @@
 | Construct the node labels.  |
 `----------------------------*/

+/* Print the lhs of a rule in such a manner that there is no vertical
+   repetition, like in *.output files. */
+
+static void
+print_lhs (struct obstack *oout, rule *previous_rule, rule *r)
+{
+  if (previous_rule && STREQ (previous_rule->lhs->tag, r->lhs->tag))
+    {
+      int i;
+      for (i = 0; i < strlen (r->lhs->tag); ++i)
+        obstack_1grow (oout, ' ');
+      obstack_1grow (oout, '|');
+    }
+  else
+    {
+      obstack_sgrow (oout, escape (r->lhs->tag));
+      obstack_1grow (oout, ':');
+    }
+}
+
 static void
 print_core (struct obstack *oout, state *s)
 {
-  size_t i;
  item_number *sitems = s->items;
+  rule *previous_rule = NULL;
+  size_t i;
  size_t snritems = s->nitems;

  /* Output all the items of a state, not only its kernel.  */
@@ -54,7 +75,8 @@ print_core (struct obstack *oout, state *s)
      snritems = nitemset;
    }

-  obstack_fgrow1 (oout, "%d", s->number);
+  obstack_printf (oout, _("State %d"), s->number);
+  obstack_sgrow (oout, "\\n\\l");
  for (i = 0; i < snritems; i++)
    {
      item_number *sp;
@@ -64,43 +86,47 @@ print_core (struct obstack *oout, state *s)
      sp1 = sp = ritem + sitems[i];

      while (*sp >= 0)
-	sp++;
+        sp++;

      r = item_number_as_rule_number (*sp);

-      obstack_fgrow1 (oout, "\n%s -> ", rules[r].lhs->tag);
+      obstack_printf (oout, "%3d ", r);
+      print_lhs (oout, previous_rule, &rules[r]);
+      previous_rule = &rules[r];

      for (sp = rules[r].rhs; sp < sp1; sp++)
-	obstack_fgrow1 (oout, "%s ", symbols[*sp]->tag);
+        obstack_printf (oout, " %s", escape (symbols[*sp]->tag));

-      obstack_1grow (oout, '.');
+      obstack_sgrow (oout, " .");

      for (/* Nothing */; *sp >= 0; ++sp)
-	obstack_fgrow1 (oout, " %s", symbols[*sp]->tag);
+        obstack_printf (oout, " %s", escape (symbols[*sp]->tag));

      /* Experimental feature: display the lookahead tokens. */
      if (report_flag & report_lookahead_tokens
          && item_number_is_rule_number (*sp1))
-	{
-	  /* Find the reduction we are handling.  */
-	  reductions *reds = s->reductions;
-	  int redno = state_reduction_find (s, &rules[r]);
+        {
+          /* Find the reduction we are handling.  */
+          reductions *reds = s->reductions;
+          int redno = state_reduction_find (s, &rules[r]);

-	  /* Print them if there are.  */
-	  if (reds->lookahead_tokens && redno != -1)
-	    {
-	      bitset_iterator biter;
-	      int k;
-	      char const *sep = "";
-	      obstack_sgrow (oout, "[");
-	      BITSET_FOR_EACH (biter, reds->lookahead_tokens[redno], k, 0)
-		{
-		  obstack_fgrow2 (oout, "%s%s", sep, symbols[k]->tag);
-		  sep = ", ";
-		}
-	      obstack_sgrow (oout, "]");
-	    }
-	}
+          /* Print them if there are.  */
+          if (reds->lookahead_tokens && redno != -1)
+            {
+              bitset_iterator biter;
+              int k;
+              char const *sep = "";
+              obstack_sgrow (oout, "  [");
+              BITSET_FOR_EACH (biter, reds->lookahead_tokens[redno], k, 0)
+                {
+                  obstack_sgrow (oout, sep);
+                  obstack_sgrow (oout, escape (symbols[k]->tag));
+                  sep = ", ";
+                }
+              obstack_1grow (oout, ']');
+            }
+        }
+      obstack_sgrow (oout, "\\l");
    }
 }

@@ -113,9 +139,8 @@ print_core (struct obstack *oout, state *s)
 static void
 print_actions (state const *s, FILE *fgraph)
 {
-  int i;
-
  transitions const *trans = s->transitions;
+  int i;

  if (!trans->num && !s->reductions)
    return;
@@ -139,6 +164,8 @@ print_actions (state const *s, FILE *fgraph)
 		     TRANSITION_IS_ERROR (trans, i) ? NULL : symbols[sym]->tag,
 		     style, fgraph);
      }
+  /* Display reductions. */
+  output_red (s, s->reductions, fgraph);
 }


@@ -128,12 +128,16 @@ record_merge_function_type (int merger, uniqstr type, location declaration_loc)
  aver (merge_function != NULL && merger_find == merger);
  if (merge_function->type != NULL && !UNIQSTR_EQ (merge_function->type, type))
    {
-      complain_at (declaration_loc,
-                   _("result type clash on merge function %s: <%s> != <%s>"),
-                   quote (merge_function->name), type, merge_function->type);
-      complain_at (merge_function->type_declaration_location,
-		   _("previous declaration"));
-    }
+      unsigned indent = 0;
+      complain_at_indent (declaration_loc, &indent,
+                          _("result type clash on merge function %s: "
+                            "<%s> != <%s>"),
+                          quote (merge_function->name), type,
+                          merge_function->type);
+      indent += SUB_INDENT;
+      complain_at_indent (merge_function->type_declaration_location, &indent,
+                          _("previous declaration"));
+   }
  merge_function->type = uniqstr_new (type);
  merge_function->type_declaration_location = declaration_loc;
 }
@@ -51,9 +51,9 @@ void grammar_current_rule_prec_set (symbol *precsym, location loc);
 void grammar_current_rule_dprec_set (int dprec, location loc);
 void grammar_current_rule_merge_set (uniqstr name, location loc);
 void grammar_current_rule_symbol_append (symbol *sym, location loc,
-					 named_ref *named_ref);
+					 named_ref *nref);
 void grammar_current_rule_action_append (const char *action, location loc,
-					 named_ref *named_ref);
+					 named_ref *nref);
 void reader (void);
 void free_merger_functions (void);

@@ -45,7 +45,10 @@ typedef struct code_props {
    CODE_PROPS_SYMBOL_ACTION, CODE_PROPS_RULE_ACTION
  } kind;

-  /** \c NULL iff \c code_props::kind is \c CODE_PROPS_NONE.  */
+  /**
+   * \c NULL iff \c code_props::kind is \c CODE_PROPS_NONE.
+   * Memory is allocated in an obstack freed elsewhere.
+   */
  char const *code;
  /** Undefined iff \c code_props::code is \c NULL.  */
  location location;
@@ -46,6 +46,9 @@ YY_DECL;

 #define YY_USER_ACTION  location_compute (loc, &loc->end, yytext, yyleng);

+static char *fetch_type_name (char *cp, char const **type_name,
+                              location dollar_loc);
+
 static void handle_action_dollar (symbol_list *rule, char *cp,
 				  location dollar_loc);
 static void handle_action_at (symbol_list *rule, char *cp, location at_loc);
@@ -95,11 +98,15 @@ ref      -?[0-9]+|{id}|"["{id}"]"|"$"
  int braces_level = 0;

  /* Whether a semicolon is probably needed.
-     The heuristic is that a semicolon is not needed after '{', '}', ';',
-     or a C preprocessor directive, and that whitespaces and comments
-     do not affect this flag.
-     Note that '{' does not need a semicolon because of '{}'.
-     A semicolon may be needed before a cpp direcive, but don't bother.  */
+
+     The heuristic is that a semicolon is not needed after '{', '}',
+     ';', or a C preprocessor directive, and that whitespaces and
+     comments do not affect this flag.  Note that '{' does not need a
+     semicolon because of '{}'.  A semicolon may be needed before a
+     cpp directive, but don't bother.
+
+     While it is maintained in several start-conditions (factoring
+     opportunities), it is meaningful only for SC_RULE_ACTION. */
  bool need_semicolon = false;

  /* Whether in a C preprocessor directive.  Don't use a start condition
@@ -157,7 +164,8 @@ ref      -?[0-9]+|{id}|"["{id}"]"|"$"
 }


-<SC_RULE_ACTION,SC_SYMBOL_ACTION>{
+<SC_RULE_ACTION,SC_SYMBOL_ACTION>
+{
  "'" {
    STRING_GROW;
    BEGIN SC_CHARACTER;
@@ -176,42 +184,31 @@ ref      -?[0-9]+|{id}|"["{id}"]"|"$"
    STRING_GROW;
    BEGIN SC_LINE_COMMENT;
  }
+  [$@]  {
+    warn_at (*loc, _("stray '%s'"), yytext);
+    obstack_escape (&obstack_for_string, yytext);
+    need_semicolon = true;
+  }
+  [\[\]]  {
+    obstack_escape (&obstack_for_string, yytext);
+    need_semicolon = true;
+  }
 }

 <SC_RULE_ACTION>
 {
  "$"("<"{tag}">")?{ref}  {
-    ref_tail_fields = 0;
+    ref_tail_fields = NULL;
    handle_action_dollar (self->rule, yytext, *loc);
-    if (ref_tail_fields) {
+    if (ref_tail_fields)
      obstack_sgrow (&obstack_for_string, ref_tail_fields);
-    }
    need_semicolon = true;
  }
  "@"{ref} {
-    ref_tail_fields = 0;
+    ref_tail_fields = NULL;
    handle_action_at (self->rule, yytext, *loc);
-    if (ref_tail_fields) {
+    if (ref_tail_fields)
      obstack_sgrow (&obstack_for_string, ref_tail_fields);
-    }
-    need_semicolon = true;
-  }
-  "$"  {
-    warn_at (*loc, _("stray '$'"));
-    obstack_sgrow (&obstack_for_string, "$][");
-    need_semicolon = true;
-  }
-  "@"  {
-    warn_at (*loc, _("stray '@'"));
-    obstack_sgrow (&obstack_for_string, "@@");
-    need_semicolon = true;
-  }
-  "["  {
-    obstack_sgrow (&obstack_for_string, "@{");
-    need_semicolon = true;
-  }
-  "]"  {
-    obstack_sgrow (&obstack_for_string, "@}");
    need_semicolon = true;
  }

@@ -223,12 +220,16 @@ ref      -?[0-9]+|{id}|"["{id}"]"|"$"
    /* As an undocumented Bison extension, append ';' before the last
       brace in braced code, so that the user code can omit trailing
       ';'.  But do not append ';' if emulating Yacc, since Yacc does
-       not append one.  */
+       not append one.  This is deprecated since release 2.4.1.  */
    if (outer_brace && !yacc_flag && language_prio == default_prio
        && skeleton_prio == default_prio && need_semicolon && ! in_cpp)
      {
-        warn_at (*loc, _("a ';' might be needed at the end of action code"));
-        warn_at (*loc, _("future versions of Bison will not add the ';'"));
+        unsigned int indent = 0;
+        warn_at_indent (*loc, &indent,
+                       _("a ';' might be needed at the end of action code"));
+        indent += SUB_INDENT;
+        warn_at_indent (*loc, &indent,
+                       _("future versions of Bison will not add the ';'"));
        obstack_1grow (&obstack_for_string, ';');
      }

@@ -263,8 +264,12 @@ ref      -?[0-9]+|{id}|"["{id}"]"|"$"

 <SC_SYMBOL_ACTION>
 {
-  "$$" {
-    obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar[");
+  "$"("<"{tag}">")?"$" {
+    const char *type_name = NULL;
+    fetch_type_name (yytext + 1, &type_name, *loc)[-1] = 0;
+    obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar(");
+    obstack_quote (&obstack_for_string, type_name);
+    obstack_sgrow (&obstack_for_string, ")[");
    self->is_value_used = true;
  }
  "@$" {
@@ -274,30 +279,18 @@ ref      -?[0-9]+|{id}|"["{id}"]"|"$"
 }


-  /*-----------------------------------------.
-  | Escape M4 quoting characters in C code.  |
-  `-----------------------------------------*/
-
 <*>
 {
-  \$	obstack_sgrow (&obstack_for_string, "$][");
-  \@	obstack_sgrow (&obstack_for_string, "@@");
-  \[	obstack_sgrow (&obstack_for_string, "@{");
-  \]	obstack_sgrow (&obstack_for_string, "@}");
+  /* Escape M4 quoting characters in C code.  */
+  [$@\[\]]    obstack_escape (&obstack_for_string, yytext);
+
+  /* By default, grow the string obstack with the input.  */
+  .|\n        STRING_GROW;
+
+  /* End of processing. */
+  <<EOF>>     STRING_FINISH; return last_string;
 }

-  /*-----------------------------------------------------.
-  | By default, grow the string obstack with the input.  |
-  `-----------------------------------------------------*/
-
-<*>.|\n	STRING_GROW;
-
- /* End of processing. */
-<*><<EOF>>	 {
-                   STRING_FINISH;
-                   return last_string;
-                 }
-
 %%

 static inline bool
@@ -345,7 +338,7 @@ typedef struct
   not visible from current midrule. */
 #define VARIANT_NOT_VISIBLE_FROM_MIDRULE (1 << 2)

-static variant *variant_table = 0;
+static variant *variant_table = NULL;
 static unsigned variant_table_size = 0;
 static unsigned variant_count = 0;

@@ -367,7 +360,7 @@ static void
 variant_table_free (void)
 {
  free (variant_table);
-  variant_table = 0;
+  variant_table = NULL;
  variant_table_size = variant_count = 0;
 }

@@ -410,7 +403,7 @@ variant_add (uniqstr id, location id_loc, unsigned symbol_index,
 }

 static const char *
-get_at_spec(unsigned symbol_index)
+get_at_spec (unsigned symbol_index)
 {
  static char at_buf[20];
  if (symbol_index == 0)
@@ -454,30 +447,30 @@ show_sub_messages (const char* cp, bool explicit_bracketing,
 	  /* Create the explanation message. */
 	  obstack_init (&msg_buf);

-	  obstack_fgrow1 (&msg_buf, _("possibly meant: %c"), dollar_or_at);
+	  obstack_printf (&msg_buf, _("possibly meant: %c"), dollar_or_at);
 	  if (contains_dot_or_dash (id))
-	    obstack_fgrow1 (&msg_buf, "[%s]", id);
+	    obstack_printf (&msg_buf, "[%s]", id);
 	  else
 	    obstack_sgrow (&msg_buf, id);
 	  obstack_sgrow (&msg_buf, tail);

 	  if (var->err & VARIANT_HIDDEN)
 	    {
-	      obstack_fgrow1 (&msg_buf, _(", hiding %c"), dollar_or_at);
+	      obstack_printf (&msg_buf, _(", hiding %c"), dollar_or_at);
 	      if (contains_dot_or_dash (var->id))
-		obstack_fgrow1 (&msg_buf, "[%s]", var->id);
+		obstack_printf (&msg_buf, "[%s]", var->id);
 	      else
 		obstack_sgrow (&msg_buf, var->id);
 	      obstack_sgrow (&msg_buf, tail);
 	    }

-	  obstack_fgrow1 (&msg_buf, _(" at %s"), at_spec);
+	  obstack_printf (&msg_buf, _(" at %s"), at_spec);

 	  if (var->err & VARIANT_NOT_VISIBLE_FROM_MIDRULE)
            {
              const char *format =
                _(", cannot be accessed from mid-rule action at $%d");
-              obstack_fgrow1 (&msg_buf, format, midrule_rhs_index);
+              obstack_printf (&msg_buf, format, midrule_rhs_index);
            }

 	  obstack_1grow (&msg_buf, '\0');
@@ -500,9 +493,6 @@ show_sub_messages (const char* cp, bool explicit_bracketing,
   points to LHS ($$) of the current rule or midrule. */
 #define LHS_REF (INT_MIN + 1)

-/* Sub-messages indent. */
-#define SUB_INDENT (4)
-
 /* Parse named or positional reference. In case of positional
   references, can return negative values for $-n "deep" stack
   accesses. */
@@ -688,6 +678,31 @@ parse_ref (char *cp, symbol_list *rule, int rule_length,
 int max_left_semantic_context = 0;


+/* If CP points to a typename (i.e., <.*?>), set TYPE_NAME to its
+   beginning (i.e., after the opening "<", and return the pointer
+   immediately after it.  */
+
+static
+char *
+fetch_type_name (char *cp, char const **type_name,
+                 location dollar_loc)
+{
+  if (*cp == '<')
+    {
+      *type_name = ++cp;
+      while (*cp != '>')
+	++cp;
+
+      /* The '>' symbol will be later replaced by '\0'. Original
+	 'text' is needed for error messages. */
+      ++cp;
+      if (untyped_var_seen)
+	complain_at (dollar_loc, _("explicit type given in untyped grammar"));
+      tag_seen = true;
+    }
+  return cp;
+}
+
 /*------------------------------------------------------------------.
 | TEXT is pointing to a wannabee semantic value (i.e., a '$').      |
 |                                                                   |
@@ -701,7 +716,6 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
 {
  char const *type_name = NULL;
  char *cp = text + 1;
-  char *gt_ptr = 0;
  symbol_list *effective_rule;
  int effective_rule_length;
  int n;
@@ -718,26 +732,14 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
    }

  /* Get the type name if explicit. */
-  if (*cp == '<')
-    {
-      type_name = ++cp;
-      while (*cp != '>')
-	++cp;
-
-      /* The '>' symbol will be later replaced by '\0'. Original
-	 'text' is needed for error messages. */
-      gt_ptr = cp;
-      ++cp;
-      if (untyped_var_seen)
-	complain_at (dollar_loc, _("explicit type given in untyped grammar"));
-      tag_seen = true;
-    }
+  cp = fetch_type_name (cp, &type_name, dollar_loc);

  n = parse_ref (cp, effective_rule, effective_rule_length,
 		 rule->midrule_parent_rhs_index, text, dollar_loc, '$');

-  if (gt_ptr)
-    *gt_ptr = '\0';
+  /* End type_name. */
+  if (type_name)
+    cp[-1] = '\0';

  switch (n)
    {
@@ -764,11 +766,11 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
            }
          else
            untyped_var_seen = true;
-          type_name = "";
        }

-      obstack_fgrow1 (&obstack_for_string,
-		      "]b4_lhs_value([%s])[", type_name);
+      obstack_sgrow (&obstack_for_string, "]b4_lhs_value(");
+      obstack_quote (&obstack_for_string, type_name);
+      obstack_sgrow (&obstack_for_string, ")[");
      rule->action_props.is_value_used = true;
      break;

@@ -785,12 +787,12 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
                         cp, quote (effective_rule->content.sym->tag));
          else
            untyped_var_seen = true;
-          type_name = "";
        }

-      obstack_fgrow3 (&obstack_for_string,
-		      "]b4_rhs_value(%d, %d, [%s])[",
-		      effective_rule_length, n, type_name);
+      obstack_printf (&obstack_for_string,
+		      "]b4_rhs_value(%d, %d, ", effective_rule_length, n);
+      obstack_quote (&obstack_for_string, type_name);
+      obstack_sgrow (&obstack_for_string, ")[");
      if (n > 0)
 	symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
 	  true;
@@ -826,7 +828,7 @@ handle_action_at (symbol_list *rule, char *text, location at_loc)
  locations_flag = true;

  n = parse_ref (cp, effective_rule, effective_rule_length,
-		       rule->midrule_parent_rhs_index, text, at_loc, '@');
+                 rule->midrule_parent_rhs_index, text, at_loc, '@');
  switch (n)
    {
    case INVALID_REF:
@@ -837,7 +839,7 @@ handle_action_at (symbol_list *rule, char *text, location at_loc)
      break;

    default:
-      obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
+      obstack_printf (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
 		      effective_rule_length, n);
      break;
    }
@@ -32,7 +32,7 @@ void gram_scanner_last_string_free (void);
 extern FILE *gram_out;
 extern int gram_lineno;

-# define GRAM_LEX_DECL int gram_lex (YYSTYPE *val, location *loc)
+# define GRAM_LEX_DECL int gram_lex (GRAM_STYPE *val, location *loc)
 GRAM_LEX_DECL;

 #endif /* !SCAN_GRAM_H_ */
@@ -36,7 +36,7 @@
 #include "reader.h"
 #include "uniqstr.h"

-#include <ctype.h>
+#include <c-ctype.h>
 #include <mbswidth.h>
 #include <quote.h>

@@ -103,9 +103,9 @@ static void unexpected_newline (boundary, char const *);
 /* Bracketed identifiers support. */
 %x SC_BRACKETED_ID SC_RETURN_BRACKETED_ID

-letter	  [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
+letter	   [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
+notletter [^.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]{-}[%\{]
 id	  {letter}({letter}|[-0-9])*
-directive %{id}
 int	  [0-9]+

 /* POSIX says that a tag must be both an id and a C union member, but
@@ -148,7 +148,7 @@ splice	 (\\[ \f\t\v]*\n)*
  /* Comments and white space.  */
  ","          warn_at (*loc, _("stray ',' treated as white space"));
  [ \f\n\t\v]  |
-  "//".*       ;
+  "//".*       continue;
  "/*" {
    token_start = loc->start;
    context_state = YY_START;
@@ -157,7 +157,7 @@ splice	 (\\[ \f\t\v]*\n)*

  /* #line directives are not documented, and may be withdrawn or
     modified in future versions of Bison.  */
-  ^"#line "{int}" \"".*"\"\n" {
+  ^"#line "{int}(" \"".*"\"")?"\n" {
    handle_syncline (yytext + sizeof "#line " - 1, *loc);
  }
 }
@@ -218,7 +218,7 @@ splice	 (\\[ \f\t\v]*\n)*
  "%verbose"                        return PERCENT_VERBOSE;
  "%yacc"                           return PERCENT_YACC;

-  {directive} {
+  "%"{id}|"%"{notletter}([[:graph:]])+ {
    complain_at (*loc, _("invalid directive: %s"), quote (yytext));
  }

@@ -290,8 +290,10 @@ splice	 (\\[ \f\t\v]*\n)*
    BEGIN SC_BRACKETED_ID;
  }

-  . {
-    complain_at (*loc, _("invalid character: %s"), quote (yytext));
+  [^\[%A-Za-z0-9_<>{}\"\'*;|=/, \f\n\t\v]+|. {
+    complain_at (*loc, "%s: %s",
+                 ngettext ("invalid character", "invalid characters", yyleng),
+                 quote_mem (yytext, yyleng));
  }

  <<EOF>> {
@@ -373,10 +375,14 @@ splice	 (\\[ \f\t\v]*\n)*
    else
      complain_at (*loc, _("an identifier expected"));
  }
-  . {
-    complain_at (*loc, _("invalid character in bracketed name: %s"),
-		 quote (yytext));
+
+  [^\].A-Za-z0-9_/ \f\n\t\v]+|. {
+    complain_at (*loc, "%s: %s",
+                 ngettext ("invalid character in bracketed name",
+                           "invalid characters in bracketed name", yyleng),
+                 quote_mem (yytext, yyleng));
  }
+
  <<EOF>> {
    BEGIN bracketed_id_context_state;
    unexpected_eof (bracketed_id_start, "]");
@@ -403,7 +409,7 @@ splice	 (\\[ \f\t\v]*\n)*
 <SC_YACC_COMMENT>
 {
  "*/"     BEGIN context_state;
-  .|\n	   ;
+  .|\n	   continue;
  <<EOF>>  unexpected_eof (token_start, "*/"); BEGIN context_state;
 }

@@ -560,7 +566,7 @@ splice	 (\\[ \f\t\v]*\n)*
  \\(.|\n)	{
    char const *p = yytext + 1;
    /* Quote only if escaping won't make the character visible.  */
-    if (isspace ((unsigned char) *p) && isprint ((unsigned char) *p))
+    if (c_isspace ((unsigned char) *p) && c_isprint ((unsigned char) *p))
      p = quote (p);
    else
      p = quotearg_style_mem (escape_quoting_style, p, 1);
@@ -839,23 +845,27 @@ convert_ucn_to_byte (char const *ucn)
 }


-/*----------------------------------------------------------------.
-| Handle '#line INT "FILE"'.  ARGS has already skipped '#line '.  |
-`----------------------------------------------------------------*/
+/*---------------------------------------------------------------------.
+| Handle '#line INT( "FILE")?\n'.  ARGS has already skipped '#line '.  |
+`---------------------------------------------------------------------*/

 static void
 handle_syncline (char *args, location loc)
 {
-  char *after_num;
-  unsigned long int lineno = strtoul (args, &after_num, 10);
-  char *file = mbschr (after_num, '"') + 1;
-  *mbschr (file, '"') = '\0';
+  char *file;
+  unsigned long int lineno = strtoul (args, &file, 10);
  if (INT_MAX <= lineno)
    {
      warn_at (loc, _("line number overflow"));
      lineno = INT_MAX;
    }
-  current_file = uniqstr_new (file);
+
+  file = mbschr (file, '"');
+  if (file)
+    {
+      *mbschr (file + 1, '"') = '\0';
+      current_file = uniqstr_new (file + 1);
+    }
  boundary_set (&scanner_cursor, current_file, lineno, 1);
 }

@@ -72,8 +72,8 @@ static void fail_for_invalid_at (char const *at);
 "@@" fputc ('@', yyout);
 "@{" fputc ('[', yyout);
 "@}" fputc (']', yyout);
-"@`" /* Empty.  Used by b4_cat in ../data/bison.m4.  */
-@\n  /* Likewise.  */
+"@`" continue;  /* Used by b4_cat in ../data/bison.m4.  */
+@\n  continue;

 "@oline@"  fprintf (yyout, "%d", out_lineno + 1);
 "@ofile@"  QPUTS (outname);
@@ -87,9 +87,9 @@ static void fail_for_invalid_at (char const *at);
 }

  /* This pattern must not match more than the previous @ patterns. */
-@[^@{}`(\n]* fail_for_invalid_at (yytext);
-\n	   out_lineno++; ECHO;
-[^@\n]+	   ECHO;
+@[^@{}`(\n]*  fail_for_invalid_at (yytext);
+\n            out_lineno++; ECHO;
+[^@\n]+       ECHO;

 <INITIAL><<EOF>> {
  if (outname)
@@ -100,15 +100,15 @@ static void fail_for_invalid_at (char const *at);
  return EOF;
 }

-<SC_AT_DIRECTIVE_ARGS>{
-  [^@]+ { STRING_GROW; }
+<SC_AT_DIRECTIVE_ARGS>
+{
+  [^@]+  STRING_GROW;

-  "@@" { obstack_1grow (&obstack_for_string, '@'); }
-  "@{" { obstack_1grow (&obstack_for_string, '['); }
-  "@}" { obstack_1grow (&obstack_for_string, ']'); }
-  "@`" /* Empty.  Useful for starting an argument
-          that begins with whitespace. */
-  @\n  /* Empty.  */
+  "@@"   obstack_1grow (&obstack_for_string, '@');
+  "@{"   obstack_1grow (&obstack_for_string, '[');
+  "@}"   obstack_1grow (&obstack_for_string, ']');
+  "@`"   continue; /* For starting an argument that begins with whitespace. */
+  @\n    continue;

  @[,)] {
    if (at_directive_argc >= AT_DIRECTIVE_ARGC_MAX)
@@ -131,15 +131,17 @@ static void fail_for_invalid_at (char const *at);
      }
  }

-  @.? { fail_for_invalid_at (yytext); }
+  @.?  fail_for_invalid_at (yytext);
 }

-<SC_AT_DIRECTIVE_SKIP_WS>{
-  [ \t\r\n]
-  . { yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS; }
+<SC_AT_DIRECTIVE_SKIP_WS>
+{
+  [ \t\r\n]    continue;
+  .            { yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS; }
 }

-<SC_AT_DIRECTIVE_ARGS,SC_AT_DIRECTIVE_SKIP_WS>{
+<SC_AT_DIRECTIVE_ARGS,SC_AT_DIRECTIVE_SKIP_WS>
+{
  <<EOF>> {
    fatal (_("unclosed %s directive in skeleton"), at_directive_argv[0]);
  }
@@ -223,49 +223,43 @@ symbol_list_null (symbol_list *node)
 }

 void
-symbol_list_destructor_set (symbol_list *node, char const *code, location loc)
+symbol_list_destructor_set (symbol_list *node, code_props const *destructor)
 {
-  code_props destructor;
-  code_props_symbol_action_init (&destructor, code, loc);
-  code_props_translate_code (&destructor);
  switch (node->content_type)
    {
      case SYMLIST_SYMBOL:
-        symbol_destructor_set (node->content.sym, &destructor);
+        symbol_destructor_set (node->content.sym, destructor);
        break;
      case SYMLIST_TYPE:
        semantic_type_destructor_set (
-          semantic_type_get (node->content.type_name), &destructor);
+          semantic_type_get (node->content.type_name), destructor);
        break;
      case SYMLIST_DEFAULT_TAGGED:
-        default_tagged_destructor_set (&destructor);
+        default_tagged_destructor_set (destructor);
        break;
      case SYMLIST_DEFAULT_TAGLESS:
-        default_tagless_destructor_set (&destructor);
+        default_tagless_destructor_set (destructor);
        break;
    }
 }

 void
-symbol_list_printer_set (symbol_list *node, char const *code, location loc)
+symbol_list_printer_set (symbol_list *node, code_props const *printer)
 {
-  code_props printer;
-  code_props_symbol_action_init (&printer, code, loc);
-  code_props_translate_code (&printer);
  switch (node->content_type)
    {
      case SYMLIST_SYMBOL:
-        symbol_printer_set (node->content.sym, &printer);
+        symbol_printer_set (node->content.sym, printer);
        break;
      case SYMLIST_TYPE:
        semantic_type_printer_set (
-          semantic_type_get (node->content.type_name), &printer);
+          semantic_type_get (node->content.type_name), printer);
        break;
      case SYMLIST_DEFAULT_TAGGED:
-        default_tagged_printer_set (&printer);
+        default_tagged_printer_set (printer);
        break;
      case SYMLIST_DEFAULT_TAGLESS:
-        default_tagless_printer_set (&printer);
+        default_tagless_printer_set (printer);
        break;
    }
 }
@@ -119,11 +119,11 @@ uniqstr symbol_list_n_type_name_get (symbol_list *l, location loc, int n);
 bool symbol_list_null (symbol_list *node);

 /** Set the \c \%destructor for \c node as \c code at \c loc.  */
-void symbol_list_destructor_set (symbol_list *node, char const *code,
-                                 location loc);
+void symbol_list_destructor_set (symbol_list *node,
+                                 code_props const *destructor);

 /** Set the \c \%printer for \c node as \c code at \c loc.  */
-void symbol_list_printer_set (symbol_list *node, char const *code,
-                              location loc);
+void symbol_list_printer_set (symbol_list *node,
+                              code_props const *printer);

 #endif /* !SYMLIST_H_ */
@@ -150,16 +150,20 @@ static void
 symbol_redeclaration (symbol *s, const char *what, location first,
                      location second)
 {
-  complain_at (second, _("%s redeclaration for %s"), what, s->tag);
-  complain_at (first, _("previous declaration"));
+  unsigned i = 0;
+  complain_at_indent (second, &i, _("%s redeclaration for %s"), what, s->tag);
+  i += SUB_INDENT;
+  complain_at_indent (first, &i, _("previous declaration"));
 }

 static void
 semantic_type_redeclaration (semantic_type *s, const char *what, location first,
                             location second)
 {
-  complain_at (second, _("%s redeclaration for <%s>"), what, s->tag);
-  complain_at (first, _("previous declaration"));
+  unsigned i = 0;
+  complain_at_indent (second, &i, _("%s redeclaration for <%s>"), what, s->tag);
+  i += SUB_INDENT;
+  complain_at_indent (first, &i, _("previous declaration"));
 }


@@ -515,6 +519,7 @@ symbol_pack_processor (void *this, void *null ATTRIBUTE_UNUSED)
 static void
 user_token_number_redeclaration (int num, symbol *first, symbol *second)
 {
+  unsigned i = 0;
  /* User token numbers are not assigned during the parsing, but in a
     second step, via a traversal of the symbol table sorted on tag.

@@ -526,11 +531,13 @@ user_token_number_redeclaration (int num, symbol *first, symbol *second)
      first = second;
      second = tmp;
    }
-  complain_at (second->location,
-               _("user token number %d redeclaration for %s"),
-               num, second->tag);
-  complain_at (first->location, _("previous declaration for %s"),
-               first->tag);
+  complain_at_indent (second->location, &i,
+                      _("user token number %d redeclaration for %s"),
+                      num, second->tag);
+  i += SUB_INDENT;
+  complain_at_indent (first->location, &i,
+                      _("previous declaration for %s"),
+                      first->tag);
 }

 /*--------------------------------------------------.
@@ -923,10 +930,12 @@ default_tagged_destructor_set (code_props const *destructor)
 {
  if (default_tagged_destructor.code)
    {
-      complain_at (destructor->location,
-                   _("redeclaration for default tagged %%destructor"));
-      complain_at (default_tagged_destructor.location,
-		   _("previous declaration"));
+      unsigned i = 0;
+      complain_at_indent (destructor->location, &i,
+                          _("redeclaration for default tagged %%destructor"));
+      i += SUB_INDENT;
+      complain_at_indent (default_tagged_destructor.location, &i,
+		          _("previous declaration"));
    }
  default_tagged_destructor = *destructor;
 }
@@ -936,10 +945,12 @@ default_tagless_destructor_set (code_props const *destructor)
 {
  if (default_tagless_destructor.code)
    {
-      complain_at (destructor->location,
-                   _("redeclaration for default tagless %%destructor"));
-      complain_at (default_tagless_destructor.location,
-		   _("previous declaration"));
+      unsigned i = 0;
+      complain_at_indent (destructor->location, &i,
+                          _("redeclaration for default tagless %%destructor"));
+      i += SUB_INDENT;
+      complain_at_indent (default_tagless_destructor.location, &i,
+                          _("previous declaration"));
    }
  default_tagless_destructor = *destructor;
 }
@@ -949,10 +960,12 @@ default_tagged_printer_set (code_props const *printer)
 {
  if (default_tagged_printer.code)
    {
-      complain_at (printer->location,
-                   _("redeclaration for default tagged %%printer"));
-      complain_at (default_tagged_printer.location,
-		   _("previous declaration"));
+      unsigned i = 0;
+      complain_at_indent (printer->location, &i,
+                          _("redeclaration for default tagged %%printer"));
+      i += SUB_INDENT;
+      complain_at_indent (default_tagged_printer.location, &i,
+		          _("previous declaration"));
    }
  default_tagged_printer = *printer;
 }
@@ -962,10 +975,12 @@ default_tagless_printer_set (code_props const *printer)
 {
  if (default_tagless_printer.code)
    {
-      complain_at (printer->location,
-                   _("redeclaration for default tagless %%printer"));
-      complain_at (default_tagless_printer.location,
-		   _("previous declaration"));
+      unsigned i = 0;
+      complain_at_indent (printer->location, &i,
+                          _("redeclaration for default tagless %%printer"));
+      i += SUB_INDENT;
+      complain_at_indent (default_tagless_printer.location, &i,
+		          _("previous declaration"));
    }
  default_tagless_printer = *printer;
 }
@@ -60,23 +60,30 @@ struct symbol
  /** The location of its first occurrence.  */
  location location;

-  /** Its \c \%type.  */
+  /** Its \c \%type.
+
+      Beware that this is the type_name as was entered by the user,
+      including silly things such as "]" if she entered "%token <]> t".
+      Therefore, when outputting type_name to M4, be sure to escape it
+      into "@}".  See quoted_output for instance.  */
  uniqstr type_name;
+
  /** Its \c \%type's location.  */
  location type_location;

  /** Any \c \%destructor declared specifically for this symbol.

-     Access this field only through <tt>symbol</tt>'s interface functions.  For
-     example, if <tt>symbol::destructor = NULL</tt>, a default \c \%destructor
-     or a per-type \c \%destructor might be appropriate, and
-     \c symbol_destructor_get will compute the correct one.  */
+      Access this field only through <tt>symbol</tt>'s interface
+      functions.  For example, if <tt>symbol::destructor = NULL</tt>, a
+      default \c \%destructor or a per-type \c \%destructor might be
+      appropriate, and \c symbol_destructor_get will compute the
+      correct one.  */
  code_props destructor;

  /** Any \c \%printer declared specifically for this symbol.

-     Access this field only through <tt>symbol</tt>'s interface functions.
-     \sa symbol::destructor  */
+      Access this field only through <tt>symbol</tt>'s interface functions.
+      \sa symbol::destructor  */
  code_props printer;

  symbol_number number;
@@ -38,14 +38,13 @@
 # include <stddef.h>
 # include <stdlib.h>
 # include <string.h>
-
-# if HAVE_SYS_TYPES_H
-#  include <sys/types.h>
-# endif
-
 # include <unistd.h>
 # include <inttypes.h>

+#define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array))
+#define STREQ(L, R)  (strcmp(L, R) == 0)
+#define STRNEQ(L, R) (!STREQ(L, R))
+
 # ifndef UINTPTR_MAX
 /* This isn't perfect, but it's good enough for Bison, which needs
   only to hash pointers.  */
@@ -105,7 +104,6 @@ typedef size_t uintptr_t;
 #  define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
 # endif

-# define FUNCTION_PRINT() fprintf (stderr, "%s: ", __func__)

 /*------.
 | NLS.  |
@@ -160,37 +158,54 @@ typedef size_t uintptr_t;
 # define obstack_chunk_free  free
 # include <obstack.h>

-# define obstack_sgrow(Obs, Str) \
+# define obstack_sgrow(Obs, Str)                \
  obstack_grow (Obs, Str, strlen (Str))

-# define obstack_fgrow1(Obs, Format, Arg1)	\
-do {						\
-  char buf[4096];				\
-  sprintf (buf, Format, Arg1);			\
-  obstack_grow (Obs, buf, strlen (buf));	\
-} while (0)
+/* Output Str escaped for our postprocessing (i.e., escape M4 special
+   characters).

-# define obstack_fgrow2(Obs, Format, Arg1, Arg2)	\
-do {						\
-  char buf[4096];				\
-  sprintf (buf, Format, Arg1, Arg2);		\
-  obstack_grow (Obs, buf, strlen (buf));	\
-} while (0)
+   For instance "[foo]" -> "@{foo@}", "$$" -> "$][$][". */

-# define obstack_fgrow3(Obs, Format, Arg1, Arg2, Arg3)	\
-do {							\
-  char buf[4096];					\
-  sprintf (buf, Format, Arg1, Arg2, Arg3);		\
-  obstack_grow (Obs, buf, strlen (buf));		\
-} while (0)
+# define obstack_escape(Obs, Str)                       \
+  do {                                                  \
+    char const *p;                                      \
+    for (p = Str; *p; p++)                              \
+      switch (*p)                                       \
+        {                                               \
+        case '$': obstack_sgrow (Obs, "$]["); break;    \
+        case '@': obstack_sgrow (Obs, "@@" ); break;    \
+        case '[': obstack_sgrow (Obs, "@{" ); break;    \
+        case ']': obstack_sgrow (Obs, "@}" ); break;    \
+        default:  obstack_1grow (Obs, *p   ); break;    \
+        }                                               \
+  } while (0)

-# define obstack_fgrow4(Obs, Format, Arg1, Arg2, Arg3, Arg4)	\
-do {								\
-  char buf[4096];						\
-  sprintf (buf, Format, Arg1, Arg2, Arg3, Arg4);		\
-  obstack_grow (Obs, buf, strlen (buf));			\
-} while (0)

+/* Output Str both quoted for M4 (i.e., embed in [[...]]), and escaped
+   for our postprocessing (i.e., escape M4 special characters).  If
+   Str is empty (or NULL), output "[]" instead of "[[]]" as it make M4
+   programming easier (m4_ifval can be used).
+
+   For instance "[foo]" -> "[[@{foo@}]]", "$$" -> "[[$][$][]]". */
+
+# define obstack_quote(Obs, Str)                \
+  do {                                          \
+    char const* obstack_quote_p = Str;          \
+    if (obstack_quote_p && obstack_quote_p[0])  \
+      {                                         \
+        obstack_sgrow (Obs, "[[");              \
+        obstack_escape (Obs, obstack_quote_p);  \
+        obstack_sgrow (Obs, "]]");              \
+      }                                         \
+    else                                        \
+      obstack_sgrow (Obs, "[]");                \
+  } while (0)
+
+
+/* Append the ending 0, finish Obs, and return the string.  */
+
+# define obstack_finish0(Obs)                           \
+  (obstack_1grow (Obs, '\0'), (char *) obstack_finish (Obs))


 /*-----------------------------------------.
@@ -205,25 +220,21 @@ do {								\
 #  define TAB_EXT ".tab"
 # endif

-# ifndef DEFAULT_TMPDIR
-#  define DEFAULT_TMPDIR "/tmp"
-# endif
-


 /*---------------------.
 | Free a linked list.  |
 `---------------------*/

-# define LIST_FREE(Type, List)			\
-do {						\
-  Type *_node, *_next;				\
-  for (_node = List; _node; _node = _next)	\
-    {						\
-      _next = _node->next;			\
-      free (_node);				\
-    }						\
-} while (0)
+# define LIST_FREE(Type, List)                  \
+  do {                                          \
+    Type *_node, *_next;                        \
+    for (_node = List; _node; _node = _next)    \
+      {                                         \
+        _next = _node->next;                    \
+        free (_node);                           \
+      }                                         \
+  } while (0)


 /*---------------------------------------------.
@@ -36,7 +36,7 @@ uniqstr uniqstr_vsprintf (char const *format, ...)
  __attribute__ ((__format__ (__printf__, 1, 2)));

 /* Two uniqstr values have the same value iff they are the same.  */
-#define UNIQSTR_EQ(USTR1, USTR2) ((USTR1) == (USTR2))
+#define UNIQSTR_EQ(USTR1, USTR2) (!!((USTR1) == (USTR2)))

 /* Compare two uniqstr a la strcmp: negative for <, nul for =, and
   positive for >.  Undefined order, relies on addresses.  */
@@ -73,23 +73,23 @@ check-local: atconfig atlocal $(TESTSUITE)
 check_SCRIPTS = bison

 # Run the test suite on the *installed* tree.
-installcheck-local:
+installcheck-local: atconfig atlocal $(TESTSUITE)
 	$(TESTSUITE) AUTOTEST_PATH="$(bindir)" $(TESTSUITEFLAGS)

 # Be real mean with it.
 .PHONY: maintainer-check-g++
-maintainer-check-g++: $(TESTSUITE)
+maintainer-check-g++: atconfig atlocal $(TESTSUITE)
 	$(TESTSUITE) $(TESTSUITEFLAGS) --compile-c-with-cxx

 .PHONY: maintainer-check-posix
-maintainer-check-posix: $(TESTSUITE)
+maintainer-check-posix: atconfig atlocal $(TESTSUITE)
 	$(TESTSUITE) $(TESTSUITEFLAGS) POSIXLY_CORRECT=1 _POSIX2_VERSION=200112

 .PHONY: maintainer-check-valgrind
-maintainer-check-valgrind: $(TESTSUITE)
+maintainer-check-valgrind: atconfig atlocal $(TESTSUITE)
 	test -z '$(VALGRIND)' ||					\
 	  $(TESTSUITE) $(TESTSUITEFLAGS)				\
-	  PREBISON='$(VALGRIND) -q' PREPARSER='$(VALGRIND) -q'		\
+	  PREBISON='$(VALGRIND_PREBISON)' PREPARSER='$(VALGRIND) -q'	\
 	  VALGRIND_OPTS='--leak-check=full --show-reachable=yes'

 .PHONY: maintainer-check
@@ -29,14 +29,10 @@ CPPFLAGS="-I$abs_top_builddir/lib @CPPFLAGS@"
 # Is the compiler GCC?
 GCC='@GCC@'

-# We want no optimization.
-  O0CFLAGS=`echo '@CFLAGS@'   | sed 's/-O[0-9] *//'`
-O0CXXFLAGS=`echo '@CXXFLAGS@' | sed 's/-O[0-9] *//'`
-
 # Sometimes a test group needs to ignore gcc warnings, so it locally
 # sets CFLAGS to this.
-  NO_WERROR_CFLAGS="$O0CFLAGS   @WARN_CFLAGS@   @WARN_CFLAGS_TEST@"
-NO_WERROR_CXXFLAGS="$O0CXXFLAGS @WARN_CXXFLAGS@ @WARN_CXXFLAGS_TEST@"
+  NO_WERROR_CFLAGS='@CFLAGS@   @WARN_CFLAGS@   @WARN_CFLAGS_TEST@'
+NO_WERROR_CXXFLAGS='@CXXFLAGS@ @WARN_CXXFLAGS@ @WARN_CXXFLAGS_TEST@'

 # But most of the time, we want -Werror.
  CFLAGS="$NO_WERROR_CFLAGS   @WERROR_CFLAGS@"
@@ -47,10 +43,12 @@ BISON_CXX_WORKS='@BISON_CXX_WORKS@'

 # Handle --compile-c-with-cxx here, once CXX and CXXFLAGS are known.
 if "$at_arg_compile_c_with_cxx"; then
+  CC_IS_CXX=1
  CC=$CXX
-  O0CFLAGS=$O0CXXFLAGS
  NO_WERROR_CFLAGS=$NO_WERROR_CXXFLAGS
  CFLAGS=$CXXFLAGS
+else
+  CC_IS_CXX=0
 fi


@@ -58,24 +56,36 @@ fi
 ## Other.  ##
 ## ------- ##

-# Are special link options needed?
-LDFLAGS='@LDFLAGS@'
-
-# Are special libraries needed?
-LIBS="$abs_top_builddir/lib/libbison.a @LIBS@ @INTLLIBS@"
-
 # Empty if no javac was found
 CONF_JAVAC='@CONF_JAVAC@'

 # Empty if no Java VM was found
 CONF_JAVA='@CONF_JAVA@'

-# Empty if no xsltproc was found
-: ${XSLTPROC='@XSLTPROC@'}
-
 # We need egrep.
 : ${EGREP='@EGREP@'}

 # Use simple quotes (lib/quote.c).
 LC_CTYPE=C
 export LC_CTYPE
+
+# Are special link options needed?
+LDFLAGS='@LDFLAGS@'
+
+# Are special libraries needed?
+LIBS="$abs_top_builddir/lib/libbison.a @LIBS@ @INTLLIBS@"
+
+# Empty if no xsltproc was found
+: ${XSLTPROC='@XSLTPROC@'}
+
+: ${PERL='@PERL@'}
+
+# Don't just check if $POSIXLY_CORRECT is set, as Bash, when launched
+# as /bin/sh, sets the shell variable POSIXLY_CORRECT to y, but not
+# the environment variable.
+: ${C_COMPILER_POSIXLY_CORRECT='@C_COMPILER_POSIXLY_CORRECT@'}
+if env | grep '^POSIXLY_CORRECT=' >/dev/null; then
+  POSIXLY_CORRECT_IS_EXPORTED=true
+else
+  POSIXLY_CORRECT_IS_EXPORTED=false
+fi
@@ -19,7 +19,7 @@

 abs_top_srcdir='@abs_top_srcdir@'
 abs_top_builddir='@abs_top_builddir@'
-: ${PERL=perl}
+: ${PERL='@PERL@'}

 # Use the shipped files, not those installed.
 BISON_PKGDATADIR=$abs_top_srcdir/data
@@ -1,4 +1,4 @@
-# Checking the output filenames.                    -*- Autotest -*-
+# Checking the C++ Features.                    -*- Autotest -*-

 # Copyright (C) 2004-2005, 2007, 2009-2012 Free Software Foundation,
 # Inc.
@@ -30,6 +30,7 @@ m4_define([AT_CHECK_DOXYGEN],
 	 [m4_fatal([invalid argument: $1])])
 AT_SETUP([Doxygen $1 Documentation])

+AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
 AT_DATA([input.yy],
 [[%skeleton "lalr1.cc"
 %locations
@@ -38,10 +39,7 @@ AT_DATA([input.yy],
 %%
 exp:;
 %%
-yy::parser::error (const location& l, const std::string& m)
-{
-  std::cerr << l << s << std::endl;
-}
+]AT_YYERROR_DEFINE[
 ]])

 AT_BISON_CHECK([-o input.cc input.yy], 0)
@@ -94,6 +92,7 @@ EXTRACT_STATIC         = AT_DOXYGEN_PRIVATE
 AT_CHECK([doxygen --version || exit 77], 0, ignore)
 AT_CHECK([doxygen], 0, [], [ignore])

+AT_BISON_OPTION_POPDEFS
 AT_CLEANUP

 m4_popdef([AT_DOXYGEN_PRIVATE])
@@ -182,3 +181,237 @@ AT_CHECK_NAMESPACE([[foo[3]::bar::baz]], [[-]])
 AT_CHECK_NAMESPACE([[foo::bar,baz]], [[-]])
 AT_CHECK_NAMESPACE([[foo::bar::(baz]], [[-]])
 AT_CLEANUP
+
+
+## ------------------ ##
+## Exception safety.  ##
+## ------------------ ##
+
+AT_SETUP([[Exception safety]])
+
+AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
+
+AT_DATA_GRAMMAR([[input.yy]],
+[[%skeleton "lalr1.cc"
+%defines // FIXME: Mandated in 2.6.
+%debug
+%error-verbose
+
+%code requires
+{
+  #include <cassert>
+  #include <cstdlib> // size_t and getenv.
+  #include <iostream>
+  #include <list>
+
+  bool debug = false;
+
+  /// A class that counts its number of instances.
+  struct Object
+  {
+    typedef std::list<const Object*> objects;
+    static objects instances;
+    char val;
+
+    static bool
+    empty ()
+    {
+      return instances.empty();
+    }
+
+    static void
+    log (Object const *o, const std::string& msg)
+    {
+      if (debug)
+        {
+          if (o)
+            std::cerr << o << "->";
+          std::cerr << msg << " {";
+          const char* sep = " ";
+          for (objects::const_iterator i = instances.begin(),
+                                       i_end = instances.end();
+               i != i_end;
+               ++i)
+            {
+              std::cerr << sep << *i;
+              sep = ", ";
+            }
+          std::cerr << " }" << std::endl;
+        }
+    }
+
+    Object (char v)
+      : val (v)
+    {
+      instances.push_back(this);
+      log (this, "Object::Object");
+    }
+
+    ~Object ()
+    {
+      instances.remove(this);
+      log (this, "Object::~Object");
+    }
+  };
+}
+
+%code
+{
+  #include <cassert>
+  #include <cstring> // strchr
+  #include <stdexcept>
+  int yylex (yy::parser::semantic_type *);
+  Object::objects Object::instances;
+  static char const *input;
+}
+
+%union
+{
+  Object *obj;
+}
+
+%initial-action
+{
+  if (strchr (input, 'i'))
+    throw std::runtime_error ("initial-action");
+}
+
+%destructor { delete $$; } <obj>;
+%printer
+{
+  yyo << $$ << " '" << $$->val << '\'';
+  if ($$->val == 'p')
+    throw std::runtime_error ("printer");
+} <obj>;
+
+%token <obj> 'a' 'E' 'e' 'p' 'R' 's' 'T'
+%type  <obj> list item
+
+%%
+
+start: list { delete $1; };
+
+list:
+  item       { $$ = $1; }
+| item list  { $$ = $1; delete $2; } // Right recursion to load the stack.
+;
+
+item:
+  'a'  { $$ = $1; }
+| 'e'  { YYUSE ($$); YYUSE($1); error (location_type(), "syntax error"); }
+// Not just 'E', otherwise we reduce when 'E' is the lookahead, and
+// then the stack is emptied, defeating the point of the test.
+| 'E' 'a' { YYUSE($1); $$ = $2; }
+| 'R'  { $$ = YY_NULL; delete $1; YYERROR; }
+| 'p'  { $$ = $1; }
+| 's'  { $$ = $1; throw std::runtime_error ("reduction"); }
+| 'T'  { $$ = YY_NULL; delete $1; YYABORT; }
+| error { $$ = YY_NULL; yyerrok; }
+;
+%%
+
+int
+yylex (yy::parser::semantic_type *lvalp)
+{
+  // 'a': no error.
+  // 'e': user action calls error.
+  // 'E': syntax error, with yyerror that throws.
+  // 'i': initial action throws.
+  // 'l': yylex throws.
+  // 'R': call YYERROR in the action
+  // 's': reduction throws.
+  // 'T': call YYABORT in the action
+  switch (int res = *input++)
+  {
+    case 'l':
+      throw std::runtime_error ("yylex");
+    default:
+      lvalp->obj = new Object (res);
+      // Fall through.
+    case 0:
+      return res;
+  }
+}
+
+/* A C++ error reporting function.  */
+void
+yy::parser::error (const location_type& l, const std::string& m)
+{
+  YYUSE (l);
+  throw std::runtime_error (m);
+}
+
+int
+main (int argc, const char *argv[])
+{
+  switch (argc)
+  {
+    case 2:
+      input = argv[1];
+      break;
+    case 3:
+      assert (!strcmp (argv[1], "--debug"));
+      debug = 1;
+      input = argv[2];
+      break;
+    default:
+      abort ();
+  }
+
+  yy::parser parser;
+  debug |= !!getenv ("YYDEBUG");
+  parser.set_debug_level (debug);
+  int res = 2;
+  try
+  {
+    res = parser.parse ();
+  }
+  catch (const std::exception& e)
+  {
+    std::cerr << "exception caught: " << e.what () << std::endl;
+  }
+  catch (...)
+  {
+    std::cerr << "unknown exception caught" << std::endl;
+  }
+  Object::log (YY_NULL, "end");
+  assert (Object::empty());
+  return res;
+}
+]])
+AT_BISON_CHECK([[-o input.cc --report=all input.yy]])
+AT_COMPILE_CXX([[input]])
+
+AT_PARSER_CHECK([[./input aaaas]], [[2]], [[]],
+[[exception caught: reduction
+]])
+
+AT_PARSER_CHECK([[./input aaaal]], [[2]], [[]],
+[[exception caught: yylex
+]])
+
+AT_PARSER_CHECK([[./input i]], [[2]], [[]],
+[[exception caught: initial-action
+]])
+
+AT_PARSER_CHECK([[./input aaaap]])
+
+AT_PARSER_CHECK([[./input --debug aaaap]], [[2]], [[]], [[stderr]])
+AT_CHECK([[grep '^exception caught: printer$' stderr]], [], [ignore])
+
+AT_PARSER_CHECK([[./input aaaae]], [[2]], [[]],
+[[exception caught: syntax error
+]])
+
+AT_PARSER_CHECK([[./input aaaaE]], [[2]], [[]],
+[[exception caught: syntax error, unexpected $end, expecting 'a'
+]])
+
+AT_PARSER_CHECK([[./input aaaaT]], [[1]])
+
+# There is error-recovery, so exit success.
+AT_PARSER_CHECK([[./input aaaaR]], [[0]])
+
+AT_BISON_OPTION_POPDEFS
+
+AT_CLEANUP
@@ -33,21 +33,90 @@
 # Don't call this macro directly, because it contains some occurrences
 # of `$1' etc. which will be interpreted by m4.  So you should call it
 # with $1, $2, and $3 as arguments, which is what AT_DATA_CALC_Y does.
+#
+# When %defines is not passed, generate a single self-contained file.
+# Otherwise, generate three: calc.y with the parser, calc-lex.c with
+# the scanner, and calc-main.c with "main()".  This is in order to
+# stress the use of the generated parser header.  To avoid code
+# duplication, AT_CALC_LEX and AT_CALC_MAIN contain the body of these
+# two later files.
 m4_define([_AT_DATA_CALC_Y],
 [m4_if([$1$2$3], $[1]$[2]$[3], [],
       [m4_fatal([$0: Invalid arguments: $@])])dnl
+
+m4_pushdef([AT_CALC_MAIN],
+[#include <assert.h>
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#else
+# undef alarm
+# define alarm(seconds) /* empty */
+#endif
+
+AT_SKEL_CC_IF([[
+/* A C++ ]AT_NAME_PREFIX[parse that simulates the C signature.  */
+int
+]AT_NAME_PREFIX[parse (]AT_PARAM_IF([semantic_value *result, int *count]))[
+{
+  ]AT_NAME_PREFIX[::parser parser]AT_PARAM_IF([ (result, count)])[;
+#if ]AT_API_PREFIX[DEBUG
+  parser.set_debug_level (1);
+#endif
+  return parser.parse ();
+}
+]])[
+
+semantic_value global_result = 0;
+int global_count = 0;
+
+/* A C main function.  */
+int
+main (int argc, const char **argv)
+{
+  semantic_value result = 0;
+  int count = 0;
+  int status;
+
+  /* This used to be alarm (10), but that isn't enough time for
+     a July 1995 vintage DEC Alphastation 200 4/100 system,
+     according to Nelson H. F. Beebe.  100 seconds is enough.  */
+  alarm (100);
+
+  if (argc == 2)
+    input = fopen (argv[1], "r");
+  else
+    input = stdin;
+
+  if (!input)
+    {
+      perror (argv[1]);
+      return 3;
+    }
+
+]AT_SKEL_CC_IF([], [m4_bmatch([$4], [%debug],
+[  ]AT_NAME_PREFIX[debug = 1;])])[
+  status = ]AT_NAME_PREFIX[parse (]AT_PARAM_IF([[&result, &count]])[);
+  if (fclose (input))
+    perror ("fclose");
+  assert (global_result == result);
+  assert (global_count == count);
+  return status;
+}
+]])
+
+
 m4_pushdef([AT_CALC_LEX],
 [[#include <ctype.h>

-int ]AT_NAME_PREFIX[lex (]AT_LEX_FORMALS[);
-static int get_char (]AT_LEX_FORMALS[);
-static void unget_char (]AT_LEX_PRE_FORMALS[ int c);
+]AT_YYLEX_DECLARE_EXTERN[
+static int get_char (]AT_YYLEX_FORMALS[);
+static void unget_char (]AT_YYLEX_PRE_FORMALS[ int c);

 ]AT_LOCATION_IF([
-static YYLTYPE last_yylloc;
+static AT_YYLTYPE last_yylloc;
 ])[
 static int
-get_char (]AT_LEX_FORMALS[)
+get_char (]AT_YYLEX_FORMALS[)
 {
  int res = getc (input);
  ]AT_USE_LEX_ARGS[;
@@ -65,7 +134,7 @@ get_char (]AT_LEX_FORMALS[)
 }

 static void
-unget_char (]AT_LEX_PRE_FORMALS[ int c)
+unget_char (]AT_YYLEX_PRE_FORMALS[ int c)
 {
  ]AT_USE_LEX_ARGS[;
 ]AT_LOCATION_IF([
@@ -76,26 +145,26 @@ unget_char (]AT_LEX_PRE_FORMALS[ int c)
 }

 static int
-read_signed_integer (]AT_LEX_FORMALS[)
+read_signed_integer (]AT_YYLEX_FORMALS[)
 {
-  int c = get_char (]AT_LEX_ARGS[);
+  int c = get_char (]AT_YYLEX_ARGS[);
  int sign = 1;
  int n = 0;

  ]AT_USE_LEX_ARGS[;
  if (c == '-')
    {
-      c = get_char (]AT_LEX_ARGS[);
+      c = get_char (]AT_YYLEX_ARGS[);
      sign = -1;
    }

  while (isdigit (c))
    {
      n = 10 * n + (c - '0');
-      c = get_char (]AT_LEX_ARGS[);
+      c = get_char (]AT_YYLEX_ARGS[);
    }

-  unget_char (]AT_LEX_PRE_ARGS[ c);
+  unget_char (]AT_YYLEX_PRE_ARGS[ c);

  return sign * n;
 }
@@ -107,21 +176,9 @@ read_signed_integer (]AT_LEX_FORMALS[)
 | blanks and tabs, returns 0 for EOF.                            |
 `---------------------------------------------------------------*/

-int
-]AT_NAME_PREFIX[lex (]AT_LEX_FORMALS[)
+]AT_YYLEX_PROTOTYPE[
 {
-  static int init = 1;
  int c;
-
-  if (init)
-    {
-      init = 0;
-]AT_LOCATION_IF([
-      AT_LOC_LAST_COLUMN = 1;
-      AT_LOC_LAST_LINE = 1;
-])[
-    }
-
  /* Skip current token, then white spaces.  */
  do
    {
@@ -130,13 +187,13 @@ int
      AT_LOC_FIRST_LINE   = AT_LOC_LAST_LINE;
 ])[
    }
-  while ((c = get_char (]AT_LEX_ARGS[)) == ' ' || c == '\t');
+  while ((c = get_char (]AT_YYLEX_ARGS[)) == ' ' || c == '\t');

  /* process numbers   */
  if (c == '.' || isdigit (c))
    {
-      unget_char (]AT_LEX_PRE_ARGS[ c);
-      ]AT_VAL[.ival = read_signed_integer (]AT_LEX_ARGS[);
+      unget_char (]AT_YYLEX_PRE_ARGS[ c);
+      ]AT_VAL[.ival = read_signed_integer (]AT_YYLEX_ARGS[);
      return NUM;
    }

@@ -193,64 +250,44 @@ AT_SKEL_CC_IF(
 {
  semantic_value ival;
 };
+%printer { ]AT_SKEL_CC_IF([[yyoutput << $$]],
+                          [[fprintf (yyoutput, "%d", $$)]])[; } <ival>;

 %code provides
 {
-#include <stdio.h>
-/* The input.  */
-extern FILE *input;]AT_SKEL_CC_IF([[
-#ifndef YYLTYPE
-# define YYLTYPE ]AT_NAME_PREFIX[::parser::location_type
-#endif
-]])[
+  #include <stdio.h>
+  /* The input.  */
+  extern FILE *input;
+  extern semantic_value global_result;
+  extern int global_count;
 }

 %code
 {
 #include <assert.h>
-#include <stdlib.h>
 #include <string.h>
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#else
-# undef alarm
-# define alarm(seconds) /* empty */
-#endif
 #define USE(Var)

 FILE *input;
-static semantic_value global_result = 0;
-static int global_count = 0;
 static int power (int base, int exponent);

-]AT_SKEL_CC_IF(,
-[/* yyerror receives the location if:
-   - %location & %pure & %glr
-   - %location & %pure & %yacc & %parse-param. */
-static void yyerror (AT_YYERROR_ARG_LOC_IF([YYLTYPE *llocp, ])
-                     AT_PARAM_IF([semantic_value *result, int *count, ])
-                     const char *s
-                     );])[
-int yylex (]AT_LEX_FORMALS[);
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE_EXTERN[
 }

-]AT_SKEL_CC_IF([AT_LOCATION_TYPE_IF([], [
-/* The lalr1.cc skeleton, for backward compatibility, defines
-   a constructor for position that initializes the filename.  The
-   glr.cc skeleton does not (and in fact cannot: location/position
-   are stored in a union, from which objects with constructors are
-   excluded in C++. */
-%initial-action {
-  @$.initialize ();
-}
-])])[
+]AT_SKEL_CC_IF([AT_LOCATION_TYPE_IF([[
+%initial-action
+{
+  @$.first.l = @$.first.c = 1;
+  @$.last = @$.first;
+}]])])[

 /* Bison Declarations */
 %token CALC_EOF 0 "end of input"
 %token <ival> NUM "number"
 %type  <ival> exp

-%nonassoc '=' /* comparison	       */
+%nonassoc '=' /* comparison            */
 %left '-' '+'
 %left '*' '/'
 %left NEG     /* negation--unary minus */
@@ -289,6 +326,16 @@ exp:
 ;
 %%

+static int
+power (int base, int exponent)
+{
+  int res = 1;
+  assert (0 <= exponent);
+  for (/* Niente */; exponent; --exponent)
+    res *= base;
+  return res;
+}
+
 ]AT_SKEL_CC_IF(
 [AT_LOCATION_TYPE_IF([[
  std::ostream&
@@ -301,100 +348,22 @@ exp:
      o << '-' << s.last.c - 1;
    return o;
  }
-]])
+]])])[
+]AT_YYERROR_DEFINE[
+]AT_DEFINES_IF([],
+[AT_CALC_LEX
+AT_CALC_MAIN])])

-/* A C++ error reporting function.  */
-void
-AT_NAME_PREFIX::parser::error (const location_type& l, const std::string& m)
-{
-  (void) l;
-  std::cerr << AT_LOCATION_IF([l << ": " << ])m << std::endl;
-}
-
-/* A C++ yyparse that simulates the C signature.  */
-int
-yyparse (AT_PARAM_IF([semantic_value *result, int *count]))
-{
-  AT_NAME_PREFIX::parser parser[]AT_PARAM_IF([ (result, count)]);
-#if YYDEBUG
-  parser.set_debug_level (1);
-#endif
-  return parser.parse ();
-}
-],
-[/* A C error reporting function.  */
-static void
-yyerror (AT_YYERROR_ARG_LOC_IF([YYLTYPE *llocp, ])
-         AT_PARAM_IF([semantic_value *result, int *count, ])
-         const char *s)
-{
-AT_PARAM_IF([(void) result; (void) count;])
-AT_YYERROR_SEES_LOC_IF([
-  fprintf (stderr, "%d.%d",
-           AT_LOC_FIRST_LINE, AT_LOC_FIRST_COLUMN);
-  if (AT_LOC_FIRST_LINE != AT_LOC_LAST_LINE)
-    fprintf (stderr, "-%d.%d",
-	     AT_LOC_LAST_LINE,  AT_LOC_LAST_COLUMN - 1);
-  else if (AT_LOC_FIRST_COLUMN != AT_LOC_LAST_COLUMN - 1)
-    fprintf (stderr, "-%d",
-	     AT_LOC_LAST_COLUMN - 1);
-  fprintf (stderr, ": ");])
-  fprintf (stderr, "%s\n", s);
-}])[
-
-]AT_DEFINES_IF(, [AT_CALC_LEX])[
-
-static int
-power (int base, int exponent)
-{
-  int res = 1;
-  assert (0 <= exponent);
-  for (/* Niente */; exponent; --exponent)
-    res *= base;
-  return res;
-}
-
-
-/* A C main function.  */
-int
-main (int argc, const char **argv)
-{
-  semantic_value result = 0;
-  int count = 0;
-  int status;
-
-  /* This used to be alarm (10), but that isn't enough time for
-     a July 1995 vintage DEC Alphastation 200 4/100 system,
-     according to Nelson H. F. Beebe.  100 seconds is enough.  */
-  alarm (100);
-
-  if (argc == 2)
-    input = fopen (argv[1], "r");
-  else
-    input = stdin;
-
-  if (!input)
-    {
-      perror (argv[1]);
-      return 3;
-    }
-
-]AT_SKEL_CC_IF([], [m4_bmatch([$4], [%debug],
-[  yydebug = 1;])])[
-  status = yyparse (]AT_PARAM_IF([[&result, &count]])[);
-  if (fclose (input))
-    perror ("fclose");
-  if (global_result != result)
-    abort ();
-  if (global_count != count)
-    abort ();
-  return status;
-}
-]])
 AT_DEFINES_IF([AT_DATA_SOURCE([[calc-lex.c]AT_SKEL_CC_IF([[c]])],
 [[#include "calc.h]AT_SKEL_CC_IF([[h]])["

-]AT_CALC_LEX])])
+]AT_CALC_LEX])
+AT_DATA_SOURCE([[calc-main.c]AT_SKEL_CC_IF([[c]])],
+[[#include "calc.h]AT_SKEL_CC_IF([[h]])["
+
+]AT_CALC_MAIN])
+])
+m4_popdef([AT_CALC_MAIN])
 m4_popdef([AT_CALC_LEX])
 ])# _AT_DATA_CALC_Y

@@ -493,21 +462,39 @@ AT_CHECK([cat stderr], 0, [expout])
 ])


-# AT_CHECK_CALC([BISON-OPTIONS, [EXPECTED-TO-FAIL]])
-# --------------------------------------------------
+# AT_CHECK_SPACES([FILE])
+# -----------------------
+# Make sure we did not introduce bad spaces.  Checked here because all
+# the skeletons are (or should be) exercized here.
+m4_define([AT_CHECK_SPACES],
+[AT_CHECK([$PERL -ne '
+  chomp;
+  print "$.: {$_}\n"
+    if (# No starting/ending empty lines.
+        (eof || $. == 1) && /^\s*$/
+        # No trailing space.  FIXME: not ready for "maint".
+        # || /\s$/
+        )' $1
+])dnl
+])
+
+
+# AT_CHECK_CALC([BISON-OPTIONS])
+# ------------------------------
 # Start a testing chunk which compiles `calc' grammar with
 # BISON-OPTIONS, and performs several tests over the parser.
-# However, if EXPECTED-TO-FAIL is nonempty, this test is expected to fail.
 m4_define([AT_CHECK_CALC],
-[# We use integers to avoid dependencies upon the precision of doubles.
-AT_SETUP([Calculator $1])
+[m4_ifval([$2], [m4_fatal([$0: expected a single argument])])

-m4_ifval([$2], [AT_CHECK([exit 77])])
+# We use integers to avoid dependencies upon the precision of doubles.
+AT_SETUP([Calculator $1])

 AT_BISON_OPTION_PUSHDEFS([$1])

 AT_DATA_CALC_Y([$1])
-AT_FULL_COMPILE([calc], [AT_DEFINES_IF([[lex]])])
+AT_FULL_COMPILE([calc], AT_DEFINES_IF([[lex], [main]]))
+AT_CHECK_SPACES([calc.AT_SKEL_CC_IF([cc], [c])])
+AT_DEFINES_IF([AT_CHECK_SPACES([calc.AT_SKEL_CC_IF([hh], [h])])])

 # Test the priorities.
 _AT_CHECK_CALC([$1],
@@ -527,7 +514,7 @@ _AT_CHECK_CALC([$1],
               [842])

 # Some syntax errors.
-_AT_CHECK_CALC_ERROR([$1], [1], [0 0], [15],
+_AT_CHECK_CALC_ERROR([$1], [1], [1 2], [15],
                     [1.3: syntax error, unexpected number])
 _AT_CHECK_CALC_ERROR([$1], [1], [1//2], [20],
                     [1.3: syntax error, unexpected '/', expecting number or '-' or '(' or '!'])
@@ -571,10 +558,10 @@ calc: error: 4444 != 1])

 # The same, but this time exercising explicitly triggered syntax errors.
 # POSIX says the lookahead causing the error should not be discarded.
-_AT_CHECK_CALC_ERROR([$1], [0], [(!) + (0 0) = 1], [102],
+_AT_CHECK_CALC_ERROR([$1], [0], [(!) + (1 2) = 1], [102],
 [1.10: syntax error, unexpected number
 calc: error: 2222 != 1])
-_AT_CHECK_CALC_ERROR([$1], [0], [(- *) + (0 0) = 1], [113],
+_AT_CHECK_CALC_ERROR([$1], [0], [(- *) + (1 2) = 1], [113],
 [1.4: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
 1.12: syntax error, unexpected number
 calc: error: 2222 != 1])
@@ -617,19 +604,21 @@ AT_CHECK_CALC_LALR([%verbose])
 AT_CHECK_CALC_LALR([%yacc])
 AT_CHECK_CALC_LALR([%error-verbose])

-AT_CHECK_CALC_LALR([%define api.pure %locations])
-AT_CHECK_CALC_LALR([%define api.push-pull both %define api.pure %locations])
+AT_CHECK_CALC_LALR([%define api.pure full %locations])
+AT_CHECK_CALC_LALR([%define api.push-pull both %define api.pure full %locations])
 AT_CHECK_CALC_LALR([%error-verbose %locations])

 AT_CHECK_CALC_LALR([%error-verbose %locations %defines %name-prefix "calc" %verbose %yacc])
+AT_CHECK_CALC_LALR([%error-verbose %locations %defines %define api.prefix "calc" %verbose %yacc])

 AT_CHECK_CALC_LALR([%debug])
 AT_CHECK_CALC_LALR([%error-verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc])
+AT_CHECK_CALC_LALR([%error-verbose %debug %locations %defines %define api.prefix "calc" %verbose %yacc])

-AT_CHECK_CALC_LALR([%define api.pure %error-verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc])
-AT_CHECK_CALC_LALR([%define api.push-pull both %define api.pure %error-verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc])
+AT_CHECK_CALC_LALR([%define api.pure full %verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc])
+AT_CHECK_CALC_LALR([%define api.push-pull both %define api.pure full %verbose %debug %locations %defines %define api.prefix "calc" %verbose %yacc])

-AT_CHECK_CALC_LALR([%define api.pure %error-verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
+AT_CHECK_CALC_LALR([%define api.pure %error-verbose %debug %locations %defines %define api.prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])


 # ----------------------- #
@@ -651,6 +640,7 @@ AT_CHECK_CALC_GLR()
 AT_CHECK_CALC_GLR([%defines])
 AT_CHECK_CALC_GLR([%locations])
 AT_CHECK_CALC_GLR([%name-prefix "calc"])
+AT_CHECK_CALC_GLR([%define api.prefix "calc"])
 AT_CHECK_CALC_GLR([%verbose])
 AT_CHECK_CALC_GLR([%yacc])
 AT_CHECK_CALC_GLR([%error-verbose])
@@ -662,10 +652,12 @@ AT_CHECK_CALC_GLR([%error-verbose %locations %defines %name-prefix "calc" %verbo

 AT_CHECK_CALC_GLR([%debug])
 AT_CHECK_CALC_GLR([%error-verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc])
+AT_CHECK_CALC_GLR([%error-verbose %debug %locations %defines %define api.prefix "calc" %verbose %yacc])

 AT_CHECK_CALC_GLR([%define api.pure %error-verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc])

 AT_CHECK_CALC_GLR([%define api.pure %error-verbose %debug %locations %defines %name-prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
+AT_CHECK_CALC_GLR([%define api.pure %error-verbose %debug %locations %defines %define api.prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])


 # ----------------------------- #
@@ -685,13 +677,15 @@ m4_define([AT_CHECK_CALC_LALR1_CC],
 [AT_CHECK_CALC([%language "C++" %defines %locations] $@)])

 AT_CHECK_CALC_LALR1_CC([])
-AT_CHECK_CALC_LALR1_CC([%define location_type Span])
+AT_CHECK_CALC_LALR1_CC([%define api.location.type Span])
 AT_CHECK_CALC_LALR1_CC([%error-verbose %name-prefix "calc" %verbose %yacc])
+AT_CHECK_CALC_LALR1_CC([%error-verbose %define api.prefix "calc" %verbose %yacc])
 AT_CHECK_CALC_LALR1_CC([%error-verbose %debug %name-prefix "calc" %verbose %yacc])

-AT_CHECK_CALC_LALR1_CC([%pure-parser %error-verbose %debug %name-prefix "calc" %verbose %yacc])
+AT_CHECK_CALC_LALR1_CC([%pure-parser %error-verbose %debug %define api.prefix "calc" %verbose %yacc])

 AT_CHECK_CALC_LALR1_CC([%pure-parser %error-verbose %debug %name-prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
+AT_CHECK_CALC_LALR1_CC([%pure-parser %error-verbose %debug %define api.prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])



@@ -712,8 +706,9 @@ m4_define([AT_CHECK_CALC_GLR_CC],
 [AT_CHECK_CALC([%language "C++" %glr-parser %defines %locations] $@)])

 AT_CHECK_CALC_GLR_CC([])
-AT_CHECK_CALC_GLR_CC([%define location_type Span])
+AT_CHECK_CALC_GLR_CC([%define api.location.type Span])
 AT_CHECK_CALC_GLR_CC([%error-verbose %name-prefix "calc" %verbose %yacc])
+AT_CHECK_CALC_GLR_CC([%error-verbose %define api.prefix "calc" %verbose %yacc])

 AT_CHECK_CALC_GLR_CC([%debug])
 AT_CHECK_CALC_GLR_CC([%error-verbose %debug %name-prefix "calc" %verbose %yacc])
@@ -721,3 +716,4 @@ AT_CHECK_CALC_GLR_CC([%error-verbose %debug %name-prefix "calc" %verbose %yacc])
 AT_CHECK_CALC_GLR_CC([%pure-parser %error-verbose %debug %name-prefix "calc" %verbose %yacc])

 AT_CHECK_CALC_GLR_CC([%pure-parser %error-verbose %debug %name-prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
+AT_CHECK_CALC_GLR_CC([%pure-parser %error-verbose %debug %define api.prefix "calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
@@ -41,6 +41,12 @@ AT_BISON_CHECK([-o input.c input.y], 0, [],
 [[input.y:4.9: warning: rule useless in parser due to conflicts: e: /* empty */
 ]])

+AT_BISON_CHECK([-fcaret -o input.c input.y], 0, [],
+[[input.y:4.9: warning: rule useless in parser due to conflicts
+ e: 'e' | /* Nothing. */;
+         ^
+]])
+
 AT_CLEANUP


@@ -50,20 +56,17 @@ AT_CLEANUP

 AT_SETUP([%nonassoc and eof])

+AT_BISON_OPTION_PUSHDEFS
 AT_DATA_GRAMMAR([input.y],
 [[
 %{
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <assert.h>

 #define YYERROR_VERBOSE 1
-static void
-yyerror (const char *msg)
-{
-  fprintf (stderr, "%s\n", msg);
-}
-
+]AT_YYERROR_DEFINE[
 /* The current argument. */
 static const char *input;

@@ -71,8 +74,7 @@ static int
 yylex (void)
 {
  static size_t toknum;
-  if (! (toknum <= strlen (input)))
-    abort ();
+  assert (toknum <= strlen (input));
  return input[toknum++];
 }

@@ -93,6 +95,7 @@ main (int argc, const char *argv[])
  return yyparse ();
 }
 ]])
+AT_BISON_OPTION_POPDEFS

 m4_pushdef([AT_NONASSOC_AND_EOF_CHECK],
 [AT_BISON_CHECK([$1[ -o input.c input.y]])
@@ -171,7 +174,7 @@ AT_SKEL_JAVA_IF([AT_DATA], [AT_DATA_GRAMMAR])([input.y],
  #include <string>]], [[
  #include <assert.h>
  #include <stdio.h>
-  void yyerror (char const *msg);]])[
+  ]AT_YYERROR_DECLARE])[
  ]AT_YYLEX_PROTOTYPE[;
  #define USE(Var)
 }
@@ -212,31 +215,11 @@ public Object getLVal ()
  *lvalp = 1;
  return *input++;
 }]])[
-
-/*----------.
-| yyerror.  |
-`----------*/]AT_SKEL_JAVA_IF([[
-
-public void yyerror (String msg)
-{
-  System.err.println (msg);
-}
-
+]AT_YYERROR_DEFINE[
+]AT_SKEL_JAVA_IF([[
 };

-%%]], [AT_SKEL_CC_IF([[
-
-void
-yy::parser::error (const yy::location &, std::string const &msg)
-{
-  std::cerr << msg << std::endl;
-}]], [[
-
-void
-yyerror (char const *msg)
-{
-  fprintf (stderr, "%s\n", msg);
-}]])])[
+%%]])[

 /*-------.
 | main.  |
@@ -471,12 +454,12 @@ AT_CLEANUP
 # with minimal LR parser tables.

 AT_SETUP([[LAC: %nonassoc requires splitting canonical LR states]])
-
+AT_BISON_OPTION_PUSHDEFS
 AT_DATA_GRAMMAR([[input.y]],
 [[%code {
  #include <stdio.h>
-  void yyerror (char const *);
-  int yylex (void);
+  ]AT_YYERROR_DECLARE[
+  ]AT_YYLEX_DECLARE[
 }

 %error-verbose
@@ -513,19 +496,8 @@ look:
 reduce-nonassoc: %prec 'a';

 %%
-
-void
-yyerror (char const *msg)
-{
-  fprintf (stderr, "%s\n", msg);
-}
-
-int
-yylex (void)
-{
-  char const *input = "aaa";
-  return *input++;
-}
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(["aaa"])[

 int
 main (void)
@@ -533,6 +505,7 @@ main (void)
  return yyparse ();
 }
 ]])
+AT_BISON_OPTION_POPDEFS

 # Show canonical LR's failure.
 AT_BISON_CHECK([[-Dlr.type=canonical-lr -o input.c input.y]],
@@ -613,7 +586,7 @@ exp (6)
    on left: 1 2, on right: 0 1


-state 0
+State 0

    0 $accept: . exp $end
    1 exp: . exp OP exp
@@ -624,14 +597,14 @@ state 0
    exp  go to state 2


-state 1
+State 1

    2 exp: NUM .

    $default  reduce using rule 2 (exp)


-state 2
+State 2

    0 $accept: exp . $end
    1 exp: exp . OP exp
@@ -640,14 +613,14 @@ state 2
    OP    shift, and go to state 4


-state 3
+State 3

    0 $accept: exp $end .

    $default  accept


-state 4
+State 4

    1 exp: . exp OP exp
    1    | exp OP . exp
@@ -658,7 +631,7 @@ state 4
    exp  go to state 5


-state 5
+State 5

    1 exp: exp . OP exp
    1    | exp OP exp .  [$end, OP]
@@ -716,7 +689,7 @@ exp (6)
    on left: 1 2, on right: 0 1


-state 0
+State 0

    0 $accept: . exp $end
    1 exp: . exp OP exp
@@ -727,14 +700,14 @@ state 0
    exp  go to state 2


-state 1
+State 1

    2 exp: NUM .

    $default  reduce using rule 2 (exp)


-state 2
+State 2

    0 $accept: exp . $end
    1 exp: exp . OP exp
@@ -743,14 +716,14 @@ state 2
    OP    shift, and go to state 4


-state 3
+State 3

    0 $accept: exp $end .

    $default  accept


-state 4
+State 4

    1 exp: . exp OP exp
    1    | exp OP . exp
@@ -761,7 +734,7 @@ state 4
    exp  go to state 5


-state 5
+State 5

    1 exp: exp . OP exp
    1    | exp OP exp .  [$end, OP]
@@ -856,7 +829,7 @@ id (7)
    on left: 4, on right: 2


-state 0
+State 0

    0 $accept: . exp $end
    1 exp: . num
@@ -871,7 +844,7 @@ state 0
    id   go to state 4


-state 1
+State 1

    3 num: '0' .  [$end]
    4 id: '0' .  [$end]
@@ -881,28 +854,28 @@ state 1
    $default  reduce using rule 3 (num)


-state 2
+State 2

    0 $accept: exp . $end

    $end  shift, and go to state 5


-state 3
+State 3

    1 exp: num .

    $default  reduce using rule 1 (exp)


-state 4
+State 4

    2 exp: id .

    $default  reduce using rule 2 (exp)


-state 5
+State 5

    0 $accept: exp $end .

@@ -929,7 +902,7 @@ exp: exp OP exp | NUM;

 AT_BISON_CHECK([-o input.c input.y], 1, [],
 [input.y: conflicts: 1 shift/reduce
-input.y: expected 0 shift/reduce conflicts
+input.y: error: expected 0 shift/reduce conflicts
 ])
 AT_CLEANUP

@@ -966,7 +939,7 @@ exp: exp OP exp | NUM;

 AT_BISON_CHECK([-o input.c input.y], 1, [],
 [input.y: conflicts: 1 shift/reduce
-input.y: expected 2 shift/reduce conflicts
+input.y: error: expected 2 shift/reduce conflicts
 ])
 AT_CLEANUP

@@ -986,7 +959,7 @@ a: 'a';

 AT_BISON_CHECK([-o input.c input.y], 1, [],
 [input.y: conflicts: 1 reduce/reduce
-input.y: expected 0 reduce/reduce conflicts
+input.y: error: expected 0 reduce/reduce conflicts
 ])
 AT_CLEANUP

@@ -1203,7 +1176,7 @@ reported_conflicts (9)
    on left: 8 9 10, on right: 1


-state 0
+State 0

    0 $accept: . start $end
    1 start: . resolved_conflict 'a' reported_conflicts 'a'
@@ -1218,28 +1191,28 @@ state 0
    Conflict between rule 3 and token 'a' resolved as reduce (%left 'a').


-state 1
+State 1

    0 $accept: start . $end

    $end  shift, and go to state 3


-state 2
+State 2

    1 start: resolved_conflict . 'a' reported_conflicts 'a'

    'a'  shift, and go to state 4


-state 3
+State 3

    0 $accept: start $end .

    $default  accept


-state 4
+State 4

    1 start: resolved_conflict 'a' . reported_conflicts 'a'
    8 reported_conflicts: . 'a'
@@ -1253,7 +1226,7 @@ state 4
    reported_conflicts  go to state 6


-state 5
+State 5

    8 reported_conflicts: 'a' .  ['a']
    9                   | 'a' .  ['a']
@@ -1263,14 +1236,14 @@ state 5
    $default  reduce using rule 8 (reported_conflicts)


-state 6
+State 6

    1 start: resolved_conflict 'a' reported_conflicts . 'a'

    'a'  shift, and go to state 7


-state 7
+State 7

    1 start: resolved_conflict 'a' reported_conflicts 'a' .

@@ -1324,8 +1297,8 @@ empty_c2: %prec 'c' ;
 empty_c3: %prec 'd' ;
 ]])
 AT_BISON_CHECK([[--report=all -o input.c input.y]], 0, [], [ignore])
-AT_CHECK([[cat input.output | sed -n '/^state 0$/,/^state 1$/p']], 0,
-[[state 0
+AT_CHECK([[cat input.output | sed -n '/^State 0$/,/^State 1$/p']], 0,
+[[State 0

    0 $accept: . start $end
    1 start: . 'a'
@@ -1361,7 +1334,7 @@ AT_CHECK([[cat input.output | sed -n '/^state 0$/,/^state 1$/p']], 0,
    Conflict between rule 13 and token 'c' resolved as reduce ('c' < 'd').


-state 1
+State 1
 ]])

 AT_CLEANUP
@@ -1400,8 +1373,8 @@ empty_c3: %prec 'c' ;
 ]])

 AT_BISON_CHECK([[--report=all -o input.c input.y]], 0, [], [ignore])
-AT_CHECK([[cat input.output | sed -n '/^state 0$/,/^state 1$/p']], 0,
-[[state 0
+AT_CHECK([[cat input.output | sed -n '/^State 0$/,/^State 1$/p']], 0,
+[[State 0

    0 $accept: . start $end
    1 start: . 'a'
@@ -1437,7 +1410,7 @@ AT_CHECK([[cat input.output | sed -n '/^state 0$/,/^state 1$/p']], 0,
    Conflict between rule 11 and token 'c' resolved as an error (%nonassoc 'c').


-state 1
+State 1
 ]])
 AT_CLEANUP

@@ -1527,11 +1500,11 @@ AT_BISON_CHECK([[-Wno-conflicts-rr sr-rr.y]], [[0]], [[]],
        echo "$file: conflicts: $conflicts" > experr
        if test $sr_count -ne $sr_exp; then
          if test $sr_exp -ne 1; then s=s; else s= ; fi
-          echo "$file: expected $sr_exp shift/reduce conflict$s" >> experr
+          echo "$file: error: expected $sr_exp shift/reduce conflict$s" >> experr
        fi
        if test $rr_count -ne $rr_exp; then
          if test $rr_exp -ne 1; then s=s; else s= ; fi
-          echo "$file: expected $rr_exp reduce/reduce conflict$s" >> experr
+          echo "$file: error: expected $rr_exp reduce/reduce conflict$s" >> experr
        fi
        ]AT_BISON_CHECK([[-Wnone $file]], [[1]], [[]], [[experr]])[
        ]AT_BISON_CHECK([[-Werror $file]], [[1]], [[]], [[experr]])[
@@ -23,15 +23,15 @@ AT_BANNER([[C++ Type Syntax (GLR).]])
 # and with RESOLVE1 and RESOLVE2 as annotations on the conflicted rule for
 # stmt.  Then compile the result.
 m4_define([_AT_TEST_GLR_CXXTYPES],
-[
-AT_BISON_OPTION_PUSHDEFS([$1])
+[AT_BISON_OPTION_PUSHDEFS([%glr-parser $1])

 AT_DATA_GRAMMAR([types.y],
 [[/* Simplified C++ Type and Expression Grammar.  */

 $1

-%{
+%code requires
+{
  #include <stdio.h>
  union Node {
    struct {
@@ -51,33 +51,22 @@ $1
    } term;
  };
  typedef union Node Node;
+  #define YYSTYPE Node *
+}
+
+%code
+{
  static Node *new_nterm (char const *, Node *, Node *, Node *);
  static Node *new_term (char *);
  static void free_node (Node *);
  static char *node_to_string (Node *);
-  #define YYSTYPE Node *
 ]m4_bmatch([$2], [stmtMerge],
 [ static YYSTYPE stmtMerge (YYSTYPE x0, YYSTYPE x1);])[
  #define YYINITDEPTH 10
  #define YYSTACKEXPANDABLE 1
-  struct YYLTYPE;
-#if YYPURE
-# if YYLSP_NEEDED
-#  define LEX_PARAMETERS YYSTYPE *lvalp, struct YYLTYPE *llocp
-#  define ERROR_PARAMETERS struct YYLTYPE *llocp, char const *s
-# else
-#  define LEX_PARAMETERS YYSTYPE *lvalp
-# endif
-#endif
-#ifndef LEX_PARAMETERS
-# define LEX_PARAMETERS void
-#endif
-#ifndef ERROR_PARAMETERS
-# define ERROR_PARAMETERS char const *s
-#endif
-  int yylex (LEX_PARAMETERS);
-  void yyerror (ERROR_PARAMETERS);
-%}
+  ]AT_YYERROR_DECLARE[
+  ]AT_YYLEX_DECLARE[
+}

 %token TYPENAME ID

@@ -133,19 +122,20 @@ declarator : ID
 #include <stdlib.h>
 #include <string.h>
 #include <stdarg.h>
+#include <assert.h>

 int
 main (int argc, char **argv)
 {
-  if (argc != 2)
-    abort ();
+  assert (argc == 2);
  if (!freopen (argv[1], "r", stdin))
    return 3;
  return yyparse ();
 }

-int
-yylex (LEX_PARAMETERS)
+]AT_YYERROR_DEFINE[
+
+]AT_YYLEX_PROTOTYPE[
 {
  char buffer[256];
  int c;
@@ -162,8 +152,7 @@ yylex (LEX_PARAMETERS)

  while (1)
    {
-      if (feof (stdin))
-        abort ();
+      assert (!feof (stdin));
      c = getchar ();
      switch (c)
        {
@@ -181,11 +170,9 @@ yylex (LEX_PARAMETERS)
          break;
        default:
          {
-            int tok;
-#if YYLSP_NEEDED
+            int tok;]AT_LOCATION_IF([[
            yylloc.first_line = yylloc.last_line = lineNum;
-            yylloc.first_column = colNum;
-#endif
+            yylloc.first_column = colNum;]])[
            if (isalpha (c))
              {
                i = 0;
@@ -194,8 +181,7 @@ yylex (LEX_PARAMETERS)
                  {
                    buffer[i++] = c;
                    colNum += 1;
-                    if (i == sizeof buffer - 1)
-                      abort ();
+                    assert (i != sizeof buffer - 1);
                    c = getchar ();
                  }
                while (isalnum (c) || c == '_');
@@ -210,27 +196,14 @@ yylex (LEX_PARAMETERS)
                colNum += 1;
                tok = c;
                yylval = YY_NULL;
-              }
-#if YYLSP_NEEDED
-            yylloc.last_column = colNum-1;
-#endif
+              }]AT_LOCATION_IF([[
+            yylloc.last_column = colNum-1;]])[
            return tok;
          }
        }
    }
 }

-void
-yyerror (ERROR_PARAMETERS)
-{
-#if YYPURE && YYLSP_NEEDED
-  /* Pacify GCC by using llocp.  */
-  if (! llocp)
-    abort ();
-#endif
-  fprintf (stderr, "%s\n", s);
-}
-
 static Node *
 new_nterm (char const *form, Node *child0, Node *child1, Node *child2)
 {
@@ -351,7 +324,7 @@ AT_BISON_OPTION_POPDEFS
 ])

 m4_define([_AT_RESOLVED_GLR_OUTPUT],
-[[[+(z,q)
+[[+(z,q)
 <declare>(T,x)
 <init-declare>(T,x,y)
 =(x,y)
@@ -360,10 +333,10 @@ m4_define([_AT_RESOLVED_GLR_OUTPUT],
 <init-declare>(T,y,+(z,q))
 <error>
 +(z,q)
-]]])
+]])

 m4_define([_AT_RESOLVED_GLR_OUTPUT_WITH_LOC],
-[[[3.0-3.5: +(z,q)
+[[3.0-3.5: +(z,q)
 5.0-5.3: <declare>(T,x)
 7.0-7.7: <init-declare>(T,x,y)
 9.0-9.5: =(x,y)
@@ -372,10 +345,10 @@ m4_define([_AT_RESOLVED_GLR_OUTPUT_WITH_LOC],
 15.0-15.13: <init-declare>(T,y,+(z,q))
 17.0-17.15: <error>
 19.0-19.5: +(z,q)
-]]])
+]])

 m4_define([_AT_AMBIG_GLR_OUTPUT],
-[[[+(z,q)
+[[+(z,q)
 <declare>(T,x)
 <init-declare>(T,x,y)
 =(x,y)
@@ -384,10 +357,10 @@ m4_define([_AT_AMBIG_GLR_OUTPUT],
 <OR>(<init-declare>(T,y,+(z,q)),=(<cast>(y,T),+(z,q)))
 <error>
 +(z,q)
-]]])
+]])

 m4_define([_AT_AMBIG_GLR_OUTPUT_WITH_LOC],
-[[[3.0-3.5: +(z,q)
+[[3.0-3.5: +(z,q)
 5.0-5.3: <declare>(T,x)
 7.0-7.7: <init-declare>(T,x,y)
 9.0-9.5: =(x,y)
@@ -396,15 +369,23 @@ m4_define([_AT_AMBIG_GLR_OUTPUT_WITH_LOC],
 15.0-15.13: <OR>(<init-declare>(T,y,+(z,q)),=(<cast>(y,T),+(z,q)))
 17.0-17.15: <error>
 19.0-19.5: +(z,q)
-]]])
+]])

 m4_define([_AT_GLR_STDERR],
-[[[syntax error
-]]])
+[[syntax error
+]])
+
+m4_define([_AT_GLR_STDERR_WITH_LOC],
+[[17.5: syntax error
+]])

 m4_define([_AT_VERBOSE_GLR_STDERR],
-[[[syntax error, unexpected ID, expecting '=' or '+' or ')'
-]]])
+[[syntax error, unexpected ID, expecting '=' or '+' or ')'
+]])
+
+m4_define([_AT_VERBOSE_GLR_STDERR_WITH_LOC],
+[[17.5: syntax error, unexpected ID, expecting '=' or '+' or ')'
+]])

 ## ---------------------------------------------------- ##
 ## Compile the grammar described in the documentation.  ##
@@ -414,59 +395,59 @@ AT_SETUP([GLR: Resolve ambiguity, impure, no locations])
 _AT_TEST_GLR_CXXTYPES([],
                      [%dprec 1], [%dprec 2])
 AT_PARSER_CHECK([[./types test-input]], 0,
-                _AT_RESOLVED_GLR_OUTPUT, _AT_GLR_STDERR)
+                [_AT_RESOLVED_GLR_OUTPUT], [_AT_GLR_STDERR])
 AT_CLEANUP

 AT_SETUP([GLR: Resolve ambiguity, impure, locations])
 _AT_TEST_GLR_CXXTYPES([%locations],[%dprec 1],[%dprec 2])
 AT_PARSER_CHECK([[./types test-input]], 0,
-                _AT_RESOLVED_GLR_OUTPUT_WITH_LOC, _AT_GLR_STDERR)
+                [_AT_RESOLVED_GLR_OUTPUT_WITH_LOC], [_AT_GLR_STDERR_WITH_LOC])
 AT_CLEANUP

 AT_SETUP([GLR: Resolve ambiguity, pure, no locations])
 _AT_TEST_GLR_CXXTYPES([%define api.pure],
                      [%dprec 1], [%dprec 2])
 AT_PARSER_CHECK([[./types test-input]], 0,
-                _AT_RESOLVED_GLR_OUTPUT, _AT_GLR_STDERR)
+                [_AT_RESOLVED_GLR_OUTPUT], [_AT_GLR_STDERR])
 AT_CLEANUP

 AT_SETUP([GLR: Resolve ambiguity, pure, locations])
 _AT_TEST_GLR_CXXTYPES([%define api.pure %locations],
                      [%dprec 1], [%dprec 2])
 AT_PARSER_CHECK([[./types test-input]], 0,
-                _AT_RESOLVED_GLR_OUTPUT_WITH_LOC, _AT_GLR_STDERR)
+                [_AT_RESOLVED_GLR_OUTPUT_WITH_LOC], [_AT_GLR_STDERR_WITH_LOC])
 AT_CLEANUP

 AT_SETUP([GLR: Merge conflicting parses, impure, no locations])
 _AT_TEST_GLR_CXXTYPES([],
                      [%merge <stmtMerge>], [%merge <stmtMerge>])
 AT_PARSER_CHECK([[./types test-input]], 0,
-                _AT_AMBIG_GLR_OUTPUT, _AT_GLR_STDERR)
+                [_AT_AMBIG_GLR_OUTPUT], [_AT_GLR_STDERR])
 AT_CLEANUP

 AT_SETUP([GLR: Merge conflicting parses, impure, locations])
 _AT_TEST_GLR_CXXTYPES([%locations],
                      [%merge <stmtMerge>], [%merge <stmtMerge>])
 AT_PARSER_CHECK([[./types test-input]], 0,
-                _AT_AMBIG_GLR_OUTPUT_WITH_LOC, _AT_GLR_STDERR)
+                [_AT_AMBIG_GLR_OUTPUT_WITH_LOC], [_AT_GLR_STDERR_WITH_LOC])
 AT_CLEANUP

 AT_SETUP([GLR: Merge conflicting parses, pure, no locations])
 _AT_TEST_GLR_CXXTYPES([%define api.pure],
                      [%merge <stmtMerge>], [%merge <stmtMerge>])
 AT_PARSER_CHECK([[./types test-input]], 0,
-                _AT_AMBIG_GLR_OUTPUT, _AT_GLR_STDERR)
+                [_AT_AMBIG_GLR_OUTPUT], [_AT_GLR_STDERR])
 AT_CLEANUP
 AT_SETUP([GLR: Merge conflicting parses, pure, locations])
 _AT_TEST_GLR_CXXTYPES([%define api.pure %locations],
                      [%merge <stmtMerge>],[%merge <stmtMerge>])
 AT_PARSER_CHECK([[./types test-input]], 0,
-                _AT_AMBIG_GLR_OUTPUT_WITH_LOC, _AT_GLR_STDERR)
+                [_AT_AMBIG_GLR_OUTPUT_WITH_LOC], [_AT_GLR_STDERR_WITH_LOC])
 AT_CLEANUP

 AT_SETUP([GLR: Verbose messages, resolve ambiguity, impure, no locations])
 _AT_TEST_GLR_CXXTYPES([%error-verbose],
                      [%merge <stmtMerge>], [%merge <stmtMerge>])
 AT_PARSER_CHECK([[./types test-input]], 0,
-                _AT_AMBIG_GLR_OUTPUT, _AT_VERBOSE_GLR_STDERR)
+                [_AT_AMBIG_GLR_OUTPUT], [_AT_VERBOSE_GLR_STDERR])
 AT_CLEANUP
@@ -35,7 +35,10 @@ dnl time comes, just use sed to drop the line numbers.  For now, as LR(1)
 dnl support is rapidly evolving, let's keep that information to be careful.
 dnl However, we don't do diffs for canonical LR(1) because the diff is huge.
 m4_pushdef([AT_LALR1_DIFF_CHECK],
-[AT_CHECK([[sed 's/^%define lr.type .*$//' input.y > input-lalr.y]])
+[dnl We need diff -u, which is not portable.
+AT_CHECK([diff -u /dev/null /dev/null || exit 77], [0], [ignore])
+
+AT_CHECK([[sed 's/^%define lr.type .*$//' input.y > input-lalr.y]])
 AT_BISON_CHECK([[--report=all input-lalr.y]], [[0]], [ignore], [ignore])
 AT_CHECK([[diff -u input-lalr.output input.output \
           | sed -n '/^@@/,$p' | sed 's/^ $//']],
@@ -486,7 +489,7 @@ dnl   - 61 -> 328: reduce -> shift on '*', '/', and '%'
     $default  reduce using rule 45 (statement)
 +
 +
-+state 320
+State 320
 +
 +  139 non_post_simp_exp: . '!' simp_exp
 +  140                  | . '(' exp r_paren
@@ -524,7 +527,7 @@ dnl   - 61 -> 328: reduce -> shift on '*', '/', and '%'
 +    variable           go to state 63
 +
 +
-+state 321
+State 321
 +
 +  146 non_post_simp_exp: INCREMENT . variable
 +  154 variable: . NAME
@@ -537,7 +540,7 @@ dnl   - 61 -> 328: reduce -> shift on '*', '/', and '%'
 +    variable  go to state 50
 +
 +
-+state 322
+State 322
 +
 +  147 non_post_simp_exp: DECREMENT . variable
 +  154 variable: . NAME
@@ -550,7 +553,7 @@ dnl   - 61 -> 328: reduce -> shift on '*', '/', and '%'
 +    variable  go to state 51
 +
 +
-+state 323
+State 323
 +
 +  130 simp_exp: . non_post_simp_exp
 +  131         | . simp_exp '^' simp_exp
@@ -598,7 +601,7 @@ dnl   - 61 -> 328: reduce -> shift on '*', '/', and '%'
 +    variable           go to state 57
 +
 +
-+state 324
+State 324
 +
 +  130 simp_exp: . non_post_simp_exp
 +  131         | . simp_exp '^' simp_exp
@@ -646,7 +649,7 @@ dnl   - 61 -> 328: reduce -> shift on '*', '/', and '%'
 +    variable           go to state 57
 +
 +
-+state 325
+State 325
 +
 +  130 simp_exp: . non_post_simp_exp
 +  131         | . simp_exp '^' simp_exp
@@ -694,7 +697,7 @@ dnl   - 61 -> 328: reduce -> shift on '*', '/', and '%'
 +    variable           go to state 57
 +
 +
-+state 326
+State 326
 +
 +  131 simp_exp: simp_exp . '^' simp_exp
 +  132         | simp_exp . '*' simp_exp
@@ -715,7 +718,7 @@ dnl   - 61 -> 328: reduce -> shift on '*', '/', and '%'
 +    Conflict between rule 151 and token '-' resolved as reduce ('-' < UNARY).
 +
 +
-+state 327
+State 327
 +
 +  131 simp_exp: simp_exp . '^' simp_exp
 +  132         | simp_exp . '*' simp_exp
@@ -736,7 +739,7 @@ dnl   - 61 -> 328: reduce -> shift on '*', '/', and '%'
 +    Conflict between rule 150 and token '-' resolved as reduce ('-' < UNARY).
 +
 +
-+state 328
+State 328
 +
 +  131 simp_exp: simp_exp . '^' simp_exp
 +  132         | simp_exp . '*' simp_exp
@@ -2037,7 +2040,7 @@ dnl   - 383 -> 427
     nth_primitive          go to state 105
@@ -3256,7 +3256,7 @@

- state 102
+ State 102

 -  146 place: label .  [$end, LABEL, VARIABLE, NUMBER, TEXT, ORDINAL, LEFT_ARROW_HEAD, RIGHT_ARROW_HEAD, DOUBLE_ARROW_HEAD, LAST, UP, DOWN, LEFT, RIGHT, HEIGHT, RADIUS, WIDTH, DIAMETER, FROM, TO, AT, WITH, BY, THEN, SOLID, DOTTED, DASHED, CHOP, SAME, INVISIBLE, LJUST, RJUST, ABOVE, BELOW, AND, HERE, DOT_X, DOT_Y, DOT_HT, DOT_WID, DOT_RAD, SIN, COS, ATAN2, LOG, EXP, SQRT, K_MAX, K_MIN, INT, RAND, SRAND, CW, CCW, THICKNESS, FILL, COLORED, OUTLINED, SHADED, ALIGNED, SPRINTF, '(', '`', ',', '>', '+', '-', '!', ';', '}', '@:>@', ')']
 +  146 place: label .  [$end, LABEL, VARIABLE, NUMBER, TEXT, ORDINAL, LEFT_ARROW_HEAD, RIGHT_ARROW_HEAD, DOUBLE_ARROW_HEAD, LAST, UP, DOWN, LEFT, RIGHT, HEIGHT, RADIUS, WIDTH, DIAMETER, FROM, TO, AT, WITH, BY, THEN, SOLID, DOTTED, DASHED, CHOP, SAME, INVISIBLE, LJUST, RJUST, ABOVE, BELOW, HERE, DOT_X, DOT_Y, DOT_HT, DOT_WID, DOT_RAD, SIN, COS, ATAN2, LOG, EXP, SQRT, K_MAX, K_MIN, INT, RAND, SRAND, CW, CCW, THICKNESS, FILL, COLORED, OUTLINED, SHADED, ALIGNED, SPRINTF, '(', '`', '+', '-', '!', ';', '}', '@:>@']
@@ -2202,7 +2205,7 @@ dnl   - 383 -> 427
 +    expr                   go to state 424


- state 165
+ State 165
@@ -7987,7 +7987,7 @@
     text_expr              go to state 112
     text                   go to state 113
@@ -2319,7 +2322,7 @@ dnl   - 383 -> 427
 +    between  go to state 425


- state 193
+ State 193
@@ -10152,7 +10152,7 @@

     expr_pair              go to state 317
@@ -2487,7 +2490,7 @@ dnl   - 383 -> 427
 +    expr                   go to state 424


- state 238
+ State 238
@@ -12937,7 +12937,7 @@
     '!'           shift, and go to state 94

@@ -2574,7 +2577,7 @@ dnl   - 383 -> 427
 +    expr                   go to state 424


- state 315
+ State 315
@@ -16124,7 +16124,7 @@

     $default  reduce using rule 239 (expr)
@@ -2625,7 +2628,7 @@ dnl   - 383 -> 427
 +    expr                   go to state 424


- state 383
+ State 383
@@ -18071,7 +18071,7 @@
     '!'           shift, and go to state 94

@@ -2668,7 +2671,7 @@ dnl   - 383 -> 427
     $default  reduce using rule 29 (placeless_element)
 +
 +
-+state 423
+State 423
 +
 +  146 place: label .  [$end, AND, DOT_X, DOT_Y, DOT_HT, DOT_WID, DOT_RAD, ',', '>', '+', '-', ';', '}', '@:>@', ')']
 +  147      | label . corner
@@ -2739,7 +2742,7 @@ dnl   - 383 -> 427
 +    corner  go to state 205
 +
 +
-+state 424
+State 424
 +
 +  140 position_not_place: expr . between position AND position
 +  141                   | expr . '<' position ',' position '>'
@@ -2782,7 +2785,7 @@ dnl   - 383 -> 427
 +    between  go to state 425
 +
 +
-+state 425
+State 425
 +
 +  134 position: . position_not_place
 +  135         | . place
@@ -2938,7 +2941,7 @@ dnl   - 383 -> 427
 +    expr                   go to state 424
 +
 +
-+state 426
+State 426
 +
 +  137 position_not_place: position . '+' expr_pair
 +  138                   | position . '-' expr_pair
@@ -2949,7 +2952,7 @@ dnl   - 383 -> 427
 +    '-'  shift, and go to state 198
 +
 +
-+state 427
+State 427
 +
 +  134 position: . position_not_place
 +  135         | . place
@@ -19,47 +19,26 @@
 AT_BANNER([[Parser Headers.]])


-## ---------------------- ##
-## %union and --defines.  ##
-## ---------------------- ##
-
-
-AT_SETUP([%union and --defines])
-
-AT_DATA([input.y],
-[%union
-{
-  int   integer;
-  char *string ;
-}
-%%
-exp: {};
-])
-
-AT_BISON_CHECK([--defines input.y])
-
-AT_CLEANUP
-
-
-
 ## --------------------- ##
 ## Invalid CPP headers.  ##
 ## --------------------- ##

-# AT_TEST_CPP_GUARD_H([INPUT-FILE-BASE)
-# -------------------------------------
+# AT_TEST_CPP_GUARD_H(BASE-NAME, [DIRECTIVES])
+# --------------------------------------------
+# FIXME: Much of this can be covered by calc.at.
 m4_define([AT_TEST_CPP_GUARD_H],
-[AT_SETUP([Invalid CPP guards: $1])
-
+[AT_SETUP([Invalid CPP guards: $2 --defines=$1.h])
+AT_BISON_OPTION_PUSHDEFS([$2])
 # Possibly create inner directories.
 dirname=`AS_DIRNAME([$1])`
 AS_MKDIR_P([$dirname])

 AT_DATA_GRAMMAR([$1.y],
-[%{
+[$2
+%{
 #include <$1.h>
-void yyerror (const char *);
-int yylex (void);
+]AT_YYERROR_DECLARE_EXTERN[
+]AT_YYLEX_DECLARE_EXTERN[
 %}
 %%
 dummy:;
@@ -67,15 +46,18 @@ dummy:;
 #include <$1.h>
 ])

-AT_BISON_CHECK([--defines=$1.h --output=y.tab.c $1.y])
+AT_BISON_CHECK([--defines=$1.h --output=$1.c $1.y])

-AT_COMPILE([y.tab.o], [-I. -c y.tab.c])
+AT_COMPILE([$1.o], [-I. -c $1.c])

+AT_BISON_OPTION_POPDEFS
 AT_CLEANUP
 ])

 AT_TEST_CPP_GUARD_H([input/input])
 AT_TEST_CPP_GUARD_H([9foo])
+AT_TEST_CPP_GUARD_H([input/input], [%glr-parser])
+AT_TEST_CPP_GUARD_H([9foo],        [%glr-parser])



@@ -129,9 +111,171 @@ main (void)

 # Link and execute, just to make sure everything is fine (and in
 # particular, that MY_LLOC is indeed defined somewhere).
-AT_COMPILE([caller.o], [-c caller.c])
-AT_COMPILE([input.o], [-c input.c])
+AT_COMPILE([caller.o])
+AT_COMPILE([input.o])
 AT_COMPILE([caller], [caller.o input.o])
 AT_PARSER_CHECK([./caller])

 AT_CLEANUP
+
+## ----------------- ##
+## Several parsers.  ##
+## ----------------- ##
+
+AT_SETUP([Several parsers])
+
+# AT_TEST([PREFIX], [DIRECTIVES])
+# -------------------------------
+# Generate and compile to *.o.  Make sure there is no (allowed) YY*
+# nor yy* identifiers in the header.  Check that headers are
+# self-contained, and can be compiled by a C++ compiler.
+m4_pushdef([AT_TEST],
+[AT_BISON_OPTION_PUSHDEFS([%define api.prefix "$1_" $2])
+AT_DATA_GRAMMAR([$1.y],
+[[%define api.prefix "$1_"
+$2
+%error-verbose
+%union
+{
+  int integer;
+}
+%{
+#include <stdio.h>
+  ]AT_YYERROR_DECLARE[
+  ]AT_YYLEX_DECLARE[
+%}
+%%
+exp:
+  'x' '1' { printf ("x1\n"); }
+| 'x' '2' { printf ("x2\n"); }
+| 'x' '3' { printf ("x3\n"); }
+| 'x' '4' { printf ("x4\n"); }
+| 'x' '5' { printf ("x5\n"); }
+| 'x' '6' { printf ("x6\n"); }
+| 'x' '7' { printf ("x7\n"); }
+| 'x' '8' { printf ("x8\n"); }
+;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(["$1"])[
+]])
+
+AT_BISON_CHECK([-d -o $1.AT_SKEL_CC_IF([cc], [c]) $1.y])
+
+AT_LANG_COMPILE([$1.o])
+AT_CHECK([[echo "$1" >>expout]])
+
+AT_BISON_OPTION_POPDEFS
+])# AT_TEST
+
+AT_DATA([main.cc],
+[AT_DATA_SOURCE_PROLOGUE
+[// If we are compiling with CC=$CXX, then do not load the C headers
+// inside extern "C", since they were _not_ compiled this way.
+#if ! CC_IS_CXX
+extern "C"
+{
+#endif
+  #include "x1.h"
+  #include "x2.h"
+  #include "x3.h"
+  #include "x4.h"
+  #include "x6.h"
+  #include "x7.h"
+  #include "x8.h"
+#if ! CC_IS_CXX
+}
+#endif
+#include "x5.hh"
+//#include "x6.hh"
+
+#define RUN(S)                                  \
+  do {                                          \
+    int res = S;                                \
+    if (res)                                    \
+      std::cerr << #S": " << res << std::endl;  \
+  } while (false)
+
+int
+main (void)
+{
+  RUN(x1_parse());
+  RUN(x2_parse());
+  RUN(x3_parse());
+  RUN(x4_parse());
+  x5_::parser p5;
+  RUN(p5.parse());
+  RUN(x6_parse());
+  RUN(x7_parse());
+  RUN(x8_parse());
+//  x6_::parser p6;
+//  RUN(p6.parse());
+  return 0;
+}
+]])# main.cc
+
+AT_TEST([x1], [])
+AT_TEST([x2], [%locations %debug])
+AT_TEST([x3], [%glr-parser])
+AT_TEST([x4], [%locations %debug %glr-parser])
+AT_TEST([x5], [%locations %debug %language "c++"])
+AT_TEST([x6], [%define api.pure])
+AT_TEST([x7], [%define api.push-pull both])
+AT_TEST([x8], [%define api.pure %define api.push-pull both])
+#AT_TEST([x5], [%locations %language "c++" %glr-parser])
+
+# Check there is no 'yy' left.
+# C++ output relies on namespaces and still uses yy a lot.
+#
+# Check there is no 'YY' left.
+# Ignore comments, YYChar (template parameter), YYPARSE_PARAM
+# (obsolete), YYPUSH_MORE(_DEFINED)?  (constant definition),
+# YY_\w+_INCLUDED (header guards).
+#
+# YYDEBUG (not renamed) can be read, but not changed.
+AT_CHECK([[$PERL -n -0777 -e '
+  s{/\*.*?\*/}{}gs;
+  s{//.*}{}g;
+  s{\b(YYChar
+      |YYPARSE_PARAM
+      |YYPUSH_MORE(_DEFINED)?
+      |YY_\w+_INCLUDED
+      |YY_NULL
+      |(defined|if)\ YYDEBUG
+      )\b}{}gx;
+  while (/^(.*YY.*)$/gm)
+  {
+    print "$ARGV: invalid exported YY: $1\n";
+  }
+  if ($ARGV =~ /\.h$/)
+  {
+    while (/^(.*yy.*)$/gm)
+    {
+      print "$ARGV: invalid exported yy: $1\n";
+    }
+  }
+' -- *.hh *.h]])
+
+# Check that the headers are self-contained, and protected against
+# multiple inclusions.  While at it, check they are sane for C++.
+for h in *.h *.hh
+do
+  # No shell expansion with AT_DATA.
+  cat >$h.cc <<EOF
+AT_DATA_SOURCE_PROLOGUE
+#include "$h"
+#include "$h"
+EOF
+  AT_COMPILE_CXX([$h.o])
+done
+
+# Do this late, so that other checks have been performed.
+AT_SKIP_IF_CANNOT_LINK_C_AND_CXX
+
+AT_COMPILE_CXX([parser], [[x[1-8].o -DCC_IS_CXX=$CC_IS_CXX main.cc]])
+AT_PARSER_CHECK([./parser], [0], [[expout]])
+
+m4_popdef([AT_TEST])
+
+AT_CLEANUP
@@ -20,6 +20,63 @@ AT_BANNER([[Input Processing.]])
 # Mostly test that we are robust to mistakes.


+## ---------------- ##
+## Invalid inputs.  ##
+## ---------------- ##
+
+AT_SETUP([Invalid inputs])
+
+AT_DATA([input.y],
+[[\000\001\002\377?
+%%
+?
+default: 'a' }
+%&
+%a-does-not-exist
+%-
+%{
+]])
+AT_CHECK([[$PERL -pi -e 's/\\(\d{3})/chr(oct($1))/ge' input.y || exit 77]])
+
+AT_BISON_CHECK([input.y], [1], [],
+[[input.y:1.1-2: error: invalid characters: '\0\001\002\377?'
+input.y:3.1: error: invalid character: '?'
+input.y:4.14: error: invalid character: '}'
+input.y:5.1: error: invalid character: '%'
+input.y:5.2: error: invalid character: '&'
+input.y:6.1-17: error: invalid directive: '%a-does-not-exist'
+input.y:7.1: error: invalid character: '%'
+input.y:7.2: error: invalid character: '-'
+input.y:8.1-9.0: error: missing '%}' at end of file
+input.y:8.1-9.0: error: syntax error, unexpected %{...%}
+]])
+
+AT_CLEANUP
+
+
+AT_SETUP([Invalid inputs with {}])
+
+# We used to SEGV here.  See
+# http://lists.gnu.org/archive/html/bug-bison/2005-07/msg00053.html
+
+AT_DATA([input.y],
+[[
+%destructor
+%initial-action
+%lex-param
+%parse-param
+%printer
+%union
+]])
+
+AT_BISON_CHECK([input.y], [1], [],
+[[input.y:3.1-15: error: syntax error, unexpected %initial-action, expecting {...}
+]])
+
+AT_CLEANUP
+
+
+
 ## ------------ ##
 ## Invalid $n.  ##
 ## ------------ ##
@@ -33,8 +90,8 @@ exp: { @$ = @1 ; };
 ]])

 AT_BISON_CHECK([input.y], [1], [],
-[[input.y:2.13-14: integer out of range: '$1'
-input.y:3.13-14: integer out of range: '@1'
+[[input.y:2.13-14: error: integer out of range: '$1'
+input.y:3.13-14: error: integer out of range: '@1'
 ]])

 AT_CLEANUP
@@ -58,8 +115,8 @@ exp: foo { $$; } foo { $2; } foo
 ]])

 AT_BISON_CHECK([input.y], [1], [],
-[[input.y:5.12-13: $$ for the midrule at $2 of 'exp' has no declared type
-input.y:5.24-25: $2 of 'exp' has no declared type
+[[input.y:5.12-13: error: $$ for the midrule at $2 of 'exp' has no declared type
+input.y:5.24-25: error: $2 of 'exp' has no declared type
 input.y:5.6-32: warning: type clash on default action: <bar> != <>
 input.y:6.6-8: warning: type clash on default action: <bar> != <>
 input.y:7.5: warning: empty rule for typed nonterminal, and no action
@@ -69,7 +126,7 @@ AT_CLEANUP


 # _AT_UNUSED_VALUES_DECLARATIONS()
-# --------------------------------------------
+# --------------------------------
 # Generate the token, type, and destructor
 # declarations for the unused values tests.

@@ -205,30 +262,30 @@ start: ;
 ]])

 AT_BISON_CHECK([input.y], [1], [],
-[[input.y:1.13-29: redeclaration for default tagged %destructor
-input.y:1.13-29: previous declaration
-input.y:2.10-24: redeclaration for default tagged %printer
-input.y:2.10-24: previous declaration
-input.y:4.13-29: redeclaration for default tagged %destructor
-input.y:1.13-29: previous declaration
-input.y:5.10-24: redeclaration for default tagged %printer
-input.y:2.10-24: previous declaration
-input.y:7.13-29: redeclaration for default tagless %destructor
-input.y:7.13-29: previous declaration
-input.y:8.10-24: redeclaration for default tagless %printer
-input.y:8.10-24: previous declaration
-input.y:10.13-29: redeclaration for default tagless %destructor
-input.y:7.13-29: previous declaration
-input.y:11.10-24: redeclaration for default tagless %printer
-input.y:8.10-24: previous declaration
-input.y:17.13-29: redeclaration for default tagged %destructor
-input.y:4.13-29: previous declaration
-input.y:18.10-24: redeclaration for default tagged %printer
-input.y:5.10-24: previous declaration
-input.y:20.13-29: redeclaration for default tagless %destructor
-input.y:10.13-29: previous declaration
-input.y:21.10-24: redeclaration for default tagless %printer
-input.y:11.10-24: previous declaration
+[[input.y:1.13-29: error: redeclaration for default tagged %destructor
+input.y:1.13-29:     previous declaration
+input.y:2.10-24: error: redeclaration for default tagged %printer
+input.y:2.10-24:     previous declaration
+input.y:4.13-29: error: redeclaration for default tagged %destructor
+input.y:1.13-29:     previous declaration
+input.y:5.10-24: error: redeclaration for default tagged %printer
+input.y:2.10-24:     previous declaration
+input.y:7.13-29: error: redeclaration for default tagless %destructor
+input.y:7.13-29:     previous declaration
+input.y:8.10-24: error: redeclaration for default tagless %printer
+input.y:8.10-24:     previous declaration
+input.y:10.13-29: error: redeclaration for default tagless %destructor
+input.y:7.13-29:      previous declaration
+input.y:11.10-24: error: redeclaration for default tagless %printer
+input.y:8.10-24:      previous declaration
+input.y:17.13-29: error: redeclaration for default tagged %destructor
+input.y:4.13-29:      previous declaration
+input.y:18.10-24: error: redeclaration for default tagged %printer
+input.y:5.10-24:      previous declaration
+input.y:20.13-29: error: redeclaration for default tagless %destructor
+input.y:10.13-29:     previous declaration
+input.y:21.10-24: error: redeclaration for default tagless %printer
+input.y:11.10-24:     previous declaration
 ]])

 AT_CLEANUP
@@ -256,22 +313,22 @@ start: ;
 ]])

 AT_BISON_CHECK([input.y], [1], [],
-[[input.y:4.13-29: %destructor redeclaration for <field1>
-input.y:1.13-29: previous declaration
-input.y:4.13-29: %destructor redeclaration for <field1>
-input.y:4.13-29: previous declaration
-input.y:5.10-24: %printer redeclaration for <field2>
-input.y:2.10-24: previous declaration
-input.y:5.10-24: %printer redeclaration for <field2>
-input.y:5.10-24: previous declaration
-input.y:11.13-29: %destructor redeclaration for <field1>
-input.y:4.13-29: previous declaration
-input.y:11.13-29: %destructor redeclaration for <field2>
-input.y:1.13-29: previous declaration
-input.y:12.10-24: %printer redeclaration for <field1>
-input.y:2.10-24: previous declaration
-input.y:12.10-24: %printer redeclaration for <field2>
-input.y:5.10-24: previous declaration
+[[input.y:4.13-29: error: %destructor redeclaration for <field1>
+input.y:1.13-29:     previous declaration
+input.y:4.13-29: error: %destructor redeclaration for <field1>
+input.y:4.13-29:     previous declaration
+input.y:5.10-24: error: %printer redeclaration for <field2>
+input.y:2.10-24:     previous declaration
+input.y:5.10-24: error: %printer redeclaration for <field2>
+input.y:5.10-24:     previous declaration
+input.y:11.13-29: error: %destructor redeclaration for <field1>
+input.y:4.13-29:      previous declaration
+input.y:11.13-29: error: %destructor redeclaration for <field2>
+input.y:1.13-29:      previous declaration
+input.y:12.10-24: error: %printer redeclaration for <field1>
+input.y:2.10-24:      previous declaration
+input.y:12.10-24: error: %printer redeclaration for <field2>
+input.y:5.10-24:      previous declaration
 ]])

 AT_CLEANUP
@@ -368,14 +425,14 @@ exp: foo;
 ]])

 AT_BISON_CHECK([input.y], [1], [],
-[[input.y:8.7-11: %type redeclaration for foo
-input.y:3.7-11: previous declaration
-input.y:10.13-17: %destructor redeclaration for foo
-input.y:5.13-17: previous declaration
-input.y:9.10-14: %printer redeclaration for foo
-input.y:4.10-14: previous declaration
-input.y:11.1-5: %left redeclaration for foo
-input.y:6.1-5: previous declaration
+[[input.y:8.7-11: error: %type redeclaration for foo
+input.y:3.7-11:     previous declaration
+input.y:10.13-17: error: %destructor redeclaration for foo
+input.y:5.13-17:      previous declaration
+input.y:9.10-14: error: %printer redeclaration for foo
+input.y:4.10-14:     previous declaration
+input.y:11.1-5: error: %left redeclaration for foo
+input.y:6.1-5:      previous declaration
 ]])

 AT_CLEANUP
@@ -391,10 +448,10 @@ AT_CLEANUP

 AT_SETUP([Torturing the Scanner])

-
+AT_BISON_OPTION_PUSHDEFS
 AT_DATA([input.y], [])
 AT_BISON_CHECK([input.y], [1], [],
-[[input.y:1.1: syntax error, unexpected end of file
+[[input.y:1.1: error: syntax error, unexpected end of file
 ]])


@@ -402,7 +459,7 @@ AT_DATA([input.y],
 [{}
 ])
 AT_BISON_CHECK([input.y], [1], [],
-[[input.y:1.1-2: syntax error, unexpected {...}
+[[input.y:1.1-2: error: syntax error, unexpected {...}
 ]])


@@ -442,6 +499,7 @@ char apostrophe = '\'';

 #include <stdio.h>
 #include <stdlib.h>
+#include <assert.h>
 %}
 /* %{ and %} can be here too. */

@@ -468,8 +526,8 @@ char quote[] = "@:>@@:>@,";
 %}

 %{
-static void yyerror (const char *s);
-static int yylex (void);
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
 %}

 %type <ival> '@<:@'
@@ -501,7 +559,7 @@ value_as_yystype (value val)
  res.ival = val;
  return res;
 }
-
+]AT_YYERROR_DEFINE[
 static int
 yylex (void)
 {
@@ -509,20 +567,13 @@ yylex (void)
 #output "; /* "
  */
  static size_t toknum;
-  if (! (toknum < sizeof input))
-    abort ();
+  assert (toknum < sizeof input);
  yylval = value_as_yystype (input[toknum]);
  return input[toknum++];
 }
-
-static void
-yyerror (const char *msg)
-{
-  fprintf (stderr, "%s\n", msg);
-}
 ]])

-# Pacify Emacs'font-lock-mode: "
+# Pacify Emacs' font-lock-mode: "

 AT_DATA([main.c],
 [[typedef int value;
@@ -536,10 +587,11 @@ main (void)
  return yyparse ();
 }
 ]])
+AT_BISON_OPTION_POPDEFS

 AT_BISON_CHECK([-d -v -o input.c input.y])
-AT_COMPILE([input.o], [-c input.c])
-AT_COMPILE([main.o], [-c main.c])
+AT_COMPILE([input.o])
+AT_COMPILE([main.o])
 AT_COMPILE([input], [input.o main.o])
 AT_PARSER_CHECK([./input], 0,
 [[[@<:@],
@@ -621,14 +673,15 @@ AT_CLEANUP

 AT_SETUP([Symbols])

+AT_BISON_OPTION_PUSHDEFS
 AT_DATA_GRAMMAR([input.y],
 [[%token WITH-DASH
 %token WITHOUT_DASH "WITHOUT-DASH"
 %token WITH.PERIOD
 %token WITHOUT_PERIOD "WITHOUT.PERIOD"
 %code {
-  void yyerror (char const *);
-  int yylex (void);
+  ]AT_YYERROR_DECLARE[
+  ]AT_YYLEX_DECLARE[
 }
 %%
 start: with-dash without_dash with.period without_period;
@@ -637,7 +690,10 @@ without_dash: "WITHOUT-DASH";
 with.period: WITH.PERIOD;
 without_period: "WITHOUT.PERIOD";
 %%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE[
 ]])
+AT_BISON_OPTION_POPDEFS

 # POSIX Yacc accept periods, but not dashes.
 AT_BISON_CHECK([--yacc input.y], [1], [],
@@ -655,7 +711,7 @@ input.y:18.8-16: warning: POSIX Yacc forbids dashes in symbol names: with-dash
 AT_BISON_CHECK([-o input.c input.y])

 # Make sure we don't export silly token identifiers with periods or dashes.
-AT_COMPILE([input.o], [-c input.c])
+AT_COMPILE([input.o])


 # Periods are genuine letters, they can start identifiers.
@@ -669,9 +725,9 @@ AT_DATA_GRAMMAR([input.y],
 start: .GOOD GOOD
 ]])
 AT_BISON_CHECK([-o input.c input.y], [1], [],
-[[input.y:10.10: invalid character: '-'
-input.y:11.10-16: invalid identifier: '1NV4L1D'
-input.y:12.10: invalid character: '-'
+[[input.y:10.10: error: invalid character: '-'
+input.y:11.10-16: error: invalid identifier: '1NV4L1D'
+input.y:12.10: error: invalid character: '-'
 ]])

 AT_CLEANUP
@@ -693,10 +749,10 @@ start: DECIMAL_1 HEXADECIMAL_2;
 ]])

 AT_BISON_CHECK([redecl.y], [1], [],
-[[redecl.y:10.10-22: user token number 11259375 redeclaration for HEXADECIMAL_1
-redecl.y:9.8-16: previous declaration for DECIMAL_1
-redecl.y:12.10-18: user token number 16702650 redeclaration for DECIMAL_2
-redecl.y:11.10-22: previous declaration for HEXADECIMAL_2
+[[redecl.y:10.10-22: error: user token number 11259375 redeclaration for HEXADECIMAL_1
+redecl.y:9.8-16:       previous declaration for DECIMAL_1
+redecl.y:12.10-18: error: user token number 16702650 redeclaration for DECIMAL_2
+redecl.y:11.10-22:     previous declaration for HEXADECIMAL_2
 ]])

 AT_DATA_GRAMMAR([too-large.y],
@@ -708,8 +764,8 @@ start: TOO_LARGE_DEC TOO_LARGE_HEX
 ]])

 AT_BISON_CHECK([too-large.y], [1], [],
-[[too-large.y:9.22-42: integer out of range: '999999999999999999999'
-too-large.y:10.24-44: integer out of range: '0xFFFFFFFFFFFFFFFFFFF'
+[[too-large.y:9.22-42: error: integer out of range: '999999999999999999999'
+too-large.y:10.24-44: error: integer out of range: '0xFFFFFFFFFFFFFFFFFFF'
 ]])

 AT_CLEANUP
@@ -749,12 +805,31 @@ start: ;
 ]])

 AT_BISON_CHECK([-o input.c input.y], 1, [],
-[[input.y:1.10-2.0: missing '"' at end of line
-input.y:4.10-5.0: missing "'" at end of line
-input.y:14.11-15.0: missing "'" at end of line
-input.y:16.11-17.0: missing '"' at end of line
-input.y:19.13-20.0: missing '}' at end of file
-input.y:20.1: syntax error, unexpected end of file
+[[input.y:1.10-2.0: error: missing '"' at end of line
+input.y:4.10-5.0: error: missing "'" at end of line
+input.y:14.11-15.0: error: missing "'" at end of line
+input.y:16.11-17.0: error: missing '"' at end of line
+input.y:19.13-20.0: error: missing '}' at end of file
+input.y:20.1: error: syntax error, unexpected end of file
+]])
+
+AT_BISON_CHECK([-fcaret -o input.c input.y], 1, [],
+[[input.y:1.10-2.0: error: missing '"' at end of line
+ %token A "a
+          ^^
+input.y:4.10-5.0: error: missing "'" at end of line
+ %token C '1
+          ^^
+input.y:14.11-15.0: error: missing "'" at end of line
+ %type <f> 'a
+           ^^
+input.y:16.11-17.0: error: missing '"' at end of line
+ %type <f> "a
+           ^^
+input.y:19.13-20.0: error: missing '}' at end of file
+ %destructor { free ($$)
+             ^^^^^^^^^^^
+input.y:20.1: error: syntax error, unexpected end of file
 ]])

 AT_CLEANUP
@@ -796,7 +871,7 @@ PREC: ;
 ]])

 AT_BISON_CHECK([input.y], [1], [],
-[[input.y:3.1-4: rule given for PREC, which is a token
+[[input.y:3.1-4: error: rule given for PREC, which is a token
 ]])

 AT_CLEANUP
@@ -837,10 +912,10 @@ AT_DATA([input-c.y],
 start: ;
 ]])
 AT_BISON_CHECK([[input-c.y]], [[1]], [],
-[[input-c.y:1.7: %code qualifier 'q' is not used
-input-c.y:2.7-9: %code qualifier 'bad' is not used
-input-c.y:3.7-9: %code qualifier 'bad' is not used
-input-c.y:4.7-12: %code qualifier 'format' is not used
+[[input-c.y:1.7: error: %code qualifier 'q' is not used
+input-c.y:2.7-9: error: %code qualifier 'bad' is not used
+input-c.y:3.7-9: error: %code qualifier 'bad' is not used
+input-c.y:4.7-12: error: %code qualifier 'format' is not used
 ]])

 AT_DATA([input-c-glr.y],
@@ -851,9 +926,9 @@ AT_DATA([input-c-glr.y],
 start: ;
 ]])
 AT_BISON_CHECK([[input-c-glr.y]], [[1]], [],
-[[input-c-glr.y:1.7: %code qualifier 'q' is not used
-input-c-glr.y:2.7-9: %code qualifier 'bad' is not used
-input-c-glr.y:3.8-10: %code qualifier 'bad' is not used
+[[input-c-glr.y:1.7: error: %code qualifier 'q' is not used
+input-c-glr.y:2.7-9: error: %code qualifier 'bad' is not used
+input-c-glr.y:3.8-10: error: %code qualifier 'bad' is not used
 ]])

 AT_DATA([input-c++.y],
@@ -864,9 +939,9 @@ AT_DATA([input-c++.y],
 start: ;
 ]])
 AT_BISON_CHECK([[input-c++.y]], [[1]], [],
-[[input-c++.y:1.7: %code qualifier 'q' is not used
-input-c++.y:2.7-9: %code qualifier 'bad' is not used
-input-c++.y:3.8: %code qualifier 'q' is not used
+[[input-c++.y:1.7: error: %code qualifier 'q' is not used
+input-c++.y:2.7-9: error: %code qualifier 'bad' is not used
+input-c++.y:3.8: error: %code qualifier 'q' is not used
 ]])

 AT_DATA([input-c++-glr.y],
@@ -877,9 +952,9 @@ AT_DATA([input-c++-glr.y],
 start: ;
 ]])
 AT_BISON_CHECK([[input-c++-glr.y]], [[1]], [],
-[[input-c++-glr.y:1.7-9: %code qualifier 'bad' is not used
-input-c++-glr.y:2.7: %code qualifier 'q' is not used
-input-c++-glr.y:3.7: %code qualifier 'q' is not used
+[[input-c++-glr.y:1.7-9: error: %code qualifier 'bad' is not used
+input-c++-glr.y:2.7: error: %code qualifier 'q' is not used
+input-c++-glr.y:3.7: error: %code qualifier 'q' is not used
 ]])

 AT_DATA([special-char-@@.y],
@@ -890,9 +965,9 @@ AT_DATA([special-char-@@.y],
 start: ;
 ]])
 AT_BISON_CHECK([[special-char-@@.y]], [[1]], [],
-[[special-char-@@.y:1.7-9: %code qualifier 'bad' is not used
-special-char-@@.y:2.7: %code qualifier 'q' is not used
-special-char-@@.y:3.7: %code qualifier 'q' is not used
+[[special-char-@@.y:1.7-9: error: %code qualifier 'bad' is not used
+special-char-@@.y:2.7: error: %code qualifier 'q' is not used
+special-char-@@.y:3.7: error: %code qualifier 'q' is not used
 ]])

 AT_DATA([special-char-@:>@.y],
@@ -903,9 +978,9 @@ AT_DATA([special-char-@:>@.y],
 start: ;
 ]])
 AT_BISON_CHECK([[special-char-@:>@.y]], [[1]], [],
-[[special-char-@:>@.y:1.7-9: %code qualifier 'bad' is not used
-special-char-@:>@.y:2.7: %code qualifier 'q' is not used
-special-char-@:>@.y:3.7: %code qualifier 'q' is not used
+[[special-char-@:>@.y:1.7-9: error: %code qualifier 'bad' is not used
+special-char-@:>@.y:2.7: error: %code qualifier 'q' is not used
+special-char-@:>@.y:3.7: error: %code qualifier 'q' is not used
 ]])

 AT_CLEANUP
@@ -928,10 +1003,10 @@ start: ;
 ]])

 AT_BISON_CHECK([[input-redefined.y]], [[1]], [],
-[[input-redefined.y:2.9-11: %define variable 'var' redefined
-input-redefined.y:1.9-11: previous definition
-input-redefined.y:3.10-12: %define variable 'var' redefined
-input-redefined.y:2.9-11: previous definition
+[[input-redefined.y:2.9-11: error: %define variable 'var' redefined
+input-redefined.y:1.9-11:     previous definition
+input-redefined.y:3.10-12: error: %define variable 'var' redefined
+input-redefined.y:2.9-11:      previous definition
 ]])

 AT_DATA([input-unused.y],
@@ -941,7 +1016,7 @@ start: ;
 ]])

 AT_BISON_CHECK([[input-unused.y]], [[1]], [],
-[[input-unused.y:1.9-11: %define variable 'var' is not used
+[[input-unused.y:1.9-11: error: %define variable 'var' is not used
 ]])

 AT_CLEANUP
@@ -985,8 +1060,20 @@ AT_DATA([[input-dg.y]],
 start: ;
 ]])
 AT_BISON_CHECK([[-Dvar=cmd-d input-dg.y]], [[1]], [],
-[[input-dg.y:1.9-11: %define variable 'var' redefined
-<command line>:2: previous definition
+[[input-dg.y:1.9-11: error: %define variable 'var' redefined
+<command line>:1:      previous definition
+]])
+
+AT_DATA([[input-dg.y]],
+[[%define var "gram"
+%%
+start: ;
+]])
+AT_BISON_CHECK([[-fcaret -Dvar=cmd-d input-dg.y]], [[1]], [],
+[[input-dg.y:1.9-11: error: %define variable 'var' redefined
+ %define var "gram"
+         ^^^
+<command line>:2:      previous definition
 ]])

 AT_DATA([[input-unused.y]],
@@ -994,8 +1081,8 @@ AT_DATA([[input-unused.y]],
 start: ;
 ]])
 AT_BISON_CHECK([[-Dunused-d -Funused-f input-unused.y]], [[1]], [],
-[[<command line>:2: %define variable 'unused-d' is not used
-<command line>:3: %define variable 'unused-f' is not used
+[[<command line>:1: error: %define variable 'unused-d' is not used
+<command line>:2: error: %define variable 'unused-f' is not used
 ]])

 AT_CLEANUP
@@ -1015,7 +1102,7 @@ start: ;
 ]])

 AT_BISON_CHECK([[Input.y]], [1], [],
-[[Input.y:2.9-14: invalid value for %define Boolean variable 'public'
+[[Input.y:2.9-14: error: invalid value for %define Boolean variable 'public'
 ]])

 AT_CLEANUP
@@ -1033,23 +1120,24 @@ AT_DATA([[input.y]],
 start: ;
 ]])
 AT_BISON_CHECK([[input.y]], [[1]], [[]],
-[[input.y:1.9-29: invalid value for %define variable 'lr.default-reductions': 'bogus'
-input.y:1.9-29: accepted value: 'most'
-input.y:1.9-29: accepted value: 'consistent'
-input.y:1.9-29: accepted value: 'accepting'
+[[input.y:1.9-29: error: invalid value for %define variable 'lr.default-reductions': 'bogus'
+input.y:1.9-29:     accepted value: 'most'
+input.y:1.9-29:     accepted value: 'consistent'
+input.y:1.9-29:     accepted value: 'accepting'
 ]])

 # Back-end.
+# FIXME: these should be indented, but we shouldn't mess with the m4 yet
 AT_DATA([[input.y]],
 [[%define api.push-pull neither
 %%
 start: ;
 ]])
 AT_BISON_CHECK([[input.y]], [1], [],
-[[input.y:1.9-21: invalid value for %define variable 'api.push-pull': 'neither'
-input.y:1.9-21: accepted value: 'pull'
-input.y:1.9-21: accepted value: 'push'
-input.y:1.9-21: accepted value: 'both'
+[[input.y:1.9-21: error: invalid value for %define variable 'api.push-pull': 'neither'
+input.y:1.9-21: error: accepted value: 'pull'
+input.y:1.9-21: error: accepted value: 'push'
+input.y:1.9-21: error: accepted value: 'both'
 ]])

 AT_CLEANUP
@@ -1069,10 +1157,10 @@ AT_DATA([[input.y]],
 start: ;
 ]])
 AT_BISON_CHECK([[input.y]], [1], [],
-[[input.y:1.9-21: invalid value for %define variable 'api.push-pull': 'neither'
-input.y:1.9-21: accepted value: 'pull'
-input.y:1.9-21: accepted value: 'push'
-input.y:1.9-21: accepted value: 'both'
+[[input.y:1.9-21: error: invalid value for %define variable 'api.push-pull': 'neither'
+input.y:1.9-21: error: accepted value: 'pull'
+input.y:1.9-21: error: accepted value: 'push'
+input.y:1.9-21: error: accepted value: 'both'
 ]])

 AT_DATA([[input.y]],
@@ -1081,7 +1169,7 @@ AT_DATA([[input.y]],
 start: ;
 ]])
 AT_BISON_CHECK([[input.y]], [1], [],
-[[input.y:1.9-34: invalid value for %define Boolean variable 'lr.keep-unreachable-states'
+[[input.y:1.9-34: error: invalid value for %define Boolean variable 'lr.keep-unreachable-states'
 ]])

 AT_DATA([[input.y]],
@@ -1090,7 +1178,7 @@ AT_DATA([[input.y]],
 start: ;
 ]])
 AT_BISON_CHECK([[input.y]], [[1]], [],
-[[input.y:1.9-15: %define variable 'foo_bar' is not used
+[[input.y:1.9-15: error: %define variable 'foo_bar' is not used
 ]])

 AT_CLEANUP
@@ -1115,7 +1203,7 @@ start: ;
 ]])

 AT_BISON_CHECK([[input.y]], [[1]], [],
-[[input.y:1.9-16: %define variable 'api.pure' is not used
+[[input.y:1.9-16: error: %define variable 'api.pure' is not used
 ]])
 ])

@@ -1149,7 +1237,7 @@ start: ;

 AT_BISON_CHECK([[input.y]], [1], [],
 [m4_foreach([b4_arg], m4_dquote(m4_shift($@)),
-[[input.y:3.9-17: ]b4_arg[
+[[input.y:3.9-17: error: ]b4_arg[
 ]])])
 ])

@@ -1195,14 +1283,14 @@ AT_DATA([empty.y],
 start: '';
 start: '
 ]])
-AT_CHECK([[perl -e "print 'start: \'';" >> empty.y || exit 77]])
+AT_CHECK([[$PERL -e "print 'start: \'';" >> empty.y || exit 77]])

 AT_BISON_CHECK([empty.y], [1], [],
 [[empty.y:2.8-9: warning: empty character literal
 empty.y:3.8-4.0: warning: empty character literal
-empty.y:3.8-4.0: missing "'" at end of line
+empty.y:3.8-4.0: error: missing "'" at end of line
 empty.y:4.8: warning: empty character literal
-empty.y:4.8: missing "'" at end of file
+empty.y:4.8: error: missing "'" at end of file
 ]])

 AT_DATA([two.y],
@@ -1210,14 +1298,14 @@ AT_DATA([two.y],
 start: 'ab';
 start: 'ab
 ]])
-AT_CHECK([[perl -e "print 'start: \'ab';" >> two.y || exit 77]])
+AT_CHECK([[$PERL -e "print 'start: \'ab';" >> two.y || exit 77]])

 AT_BISON_CHECK([two.y], [1], [],
 [[two.y:2.8-11: warning: extra characters in character literal
 two.y:3.8-4.0: warning: extra characters in character literal
-two.y:3.8-4.0: missing "'" at end of line
+two.y:3.8-4.0: error: missing "'" at end of line
 two.y:4.8-10: warning: extra characters in character literal
-two.y:4.8-10: missing "'" at end of file
+two.y:4.8-10: error: missing "'" at end of file
 ]])

 AT_DATA([three.y],
@@ -1225,14 +1313,14 @@ AT_DATA([three.y],
 start: 'abc';
 start: 'abc
 ]])
-AT_CHECK([[perl -e "print 'start: \'abc';" >> three.y || exit 77]])
+AT_CHECK([[$PERL -e "print 'start: \'abc';" >> three.y || exit 77]])

 AT_BISON_CHECK([three.y], [1], [],
 [[three.y:2.8-12: warning: extra characters in character literal
 three.y:3.8-4.0: warning: extra characters in character literal
-three.y:3.8-4.0: missing "'" at end of line
+three.y:3.8-4.0: error: missing "'" at end of line
 three.y:4.8-11: warning: extra characters in character literal
-three.y:4.8-11: missing "'" at end of file
+three.y:4.8-11: error: missing "'" at end of file
 ]])

 AT_CLEANUP
@@ -1254,34 +1342,34 @@ start: '\777' '\0' '\xfff' '\x0'
 # Beside we cannot even expect "echo '\0'" to output two characters
 # (well three with \n): at least Bash 3.2 converts the two-character
 # sequence "\0" into a single NUL character.
-AT_CHECK([[perl -e 'print "start: \"\\\t\\\f\\\0\\\1\" ;";' >> input.y \
+AT_CHECK([[$PERL -e 'print "start: \"\\\t\\\f\\\0\\\1\" ;";' >> input.y \
           || exit 77]])

 AT_BISON_CHECK([input.y], [1], [],
-[[input.y:2.9-12: invalid number after \-escape: 777
+[[input.y:2.9-12: error: invalid number after \-escape: 777
 input.y:2.8-13: warning: empty character literal
-input.y:2.16-17: invalid number after \-escape: 0
+input.y:2.16-17: error: invalid number after \-escape: 0
 input.y:2.15-18: warning: empty character literal
-input.y:2.21-25: invalid number after \-escape: xfff
+input.y:2.21-25: error: invalid number after \-escape: xfff
 input.y:2.20-26: warning: empty character literal
-input.y:2.29-31: invalid number after \-escape: x0
+input.y:2.29-31: error: invalid number after \-escape: x0
 input.y:2.28-32: warning: empty character literal
-input.y:3.9-14: invalid number after \-escape: uffff
+input.y:3.9-14: error: invalid number after \-escape: uffff
 input.y:3.8-15: warning: empty character literal
-input.y:3.18-23: invalid number after \-escape: u0000
+input.y:3.18-23: error: invalid number after \-escape: u0000
 input.y:3.17-24: warning: empty character literal
-input.y:3.27-36: invalid number after \-escape: Uffffffff
+input.y:3.27-36: error: invalid number after \-escape: Uffffffff
 input.y:3.26-37: warning: empty character literal
-input.y:3.40-49: invalid number after \-escape: U00000000
+input.y:3.40-49: error: invalid number after \-escape: U00000000
 input.y:3.39-50: warning: empty character literal
-input.y:4.9-10: invalid character after \-escape: ' '
+input.y:4.9-10: error: invalid character after \-escape: ' '
 input.y:4.8-11: warning: empty character literal
-input.y:4.14-15: invalid character after \-escape: A
+input.y:4.14-15: error: invalid character after \-escape: A
 input.y:4.13-16: warning: empty character literal
-input.y:5.9-16: invalid character after \-escape: \t
-input.y:5.17: invalid character after \-escape: \f
-input.y:5.18: invalid character after \-escape: \0
-input.y:5.19: invalid character after \-escape: \001
+input.y:5.9-16: error: invalid character after \-escape: \t
+input.y:5.17: error: invalid character after \-escape: \f
+input.y:5.18: error: invalid character after \-escape: \0
+input.y:5.19: error: invalid character after \-escape: \001
 ]])

 AT_CLEANUP
@@ -1300,11 +1388,11 @@ start: ;
 # parse.lac.* options are useless if LAC isn't actually activated.
 AT_BISON_CHECK([[-Dparse.lac.es-capacity-initial=1 input.y]],
               [[1]], [],
-[[<command line>:2: %define variable 'parse.lac.es-capacity-initial' is not used
+[[<command line>:1: error: %define variable 'parse.lac.es-capacity-initial' is not used
 ]])
 AT_BISON_CHECK([[-Dparse.lac.memory-trace=full input.y]],
               [[1]], [],
-[[<command line>:2: %define variable 'parse.lac.memory-trace' is not used
+[[<command line>:1: error: %define variable 'parse.lac.memory-trace' is not used
 ]])

 AT_CLEANUP
@@ -1341,3 +1429,129 @@ input.y:2.1-7: warning: POSIX Yacc forbids dashes in symbol names: foo-bar
 AT_BISON_CHECK([[-Werror,no-all,yacc input.y]], [[1]], [[]], [[experr]])

 AT_CLEANUP
+
+
+## ------------------------------------------------------ ##
+## %name-prefix and %define api.prefix are incompatible.  ##
+## ------------------------------------------------------ ##
+
+AT_SETUP([[%name-prefix and %define api.prefix are incompatible]])
+
+# AT_TEST(DIRECTIVES, OPTIONS, ERROR-LOCATION)
+# --------------------------------------------
+m4_pushdef([AT_TEST],
+[AT_DATA([[input.y]],
+[[$1
+%%
+exp:;
+]])
+AT_BISON_CHECK([[$2 input.y]], [[1]], [[]],
+[[$3: error: '%name-prefix' and '%define api.prefix' cannot be used together
+]])
+])
+
+AT_TEST([%define api.prefix foo %name-prefix "bar"], [], [input.y:1.9-18])
+AT_TEST([], [-Dapi.prefix=foo -p bar], [<command line>:1])
+AT_TEST([%name-prefix "bar"], [-Dapi.prefix=foo], [<command line>:1])
+AT_TEST([%define api.prefix foo], [-p bar], [input.y:1.9-18])
+
+m4_popdef([AT_TEST])
+
+AT_CLEANUP
+
+
+## -------------- ##
+## Stray $ or @.  ##
+## -------------- ##
+
+AT_SETUP([[Stray $ or @]])
+
+# Give %printer and %destructor "<*> exp TOK" instead of "<*>" to
+# check that the warnings are reported once, not three times.
+
+AT_DATA_GRAMMAR([[input.y]],
+[[%token TOK
+%destructor     { $%; @%; } <*> exp TOK;
+%initial-action { $%; @%; };
+%printer        { $%; @%; } <*> exp TOK;
+%%
+exp: TOK        { $%; @%; $$ = $1; };
+]])
+
+AT_BISON_CHECK([[input.y]], 0, [],
+[[input.y:10.19: warning: stray '$'
+input.y:10.23: warning: stray '@'
+input.y:11.19: warning: stray '$'
+input.y:11.23: warning: stray '@'
+input.y:12.19: warning: stray '$'
+input.y:12.23: warning: stray '@'
+input.y:14.19: warning: stray '$'
+input.y:14.23: warning: stray '@'
+]])
+
+AT_CLEANUP
+
+
+
+## ---------------- ##
+## Code injection.  ##
+## ---------------- ##
+
+
+AT_SETUP([[Code injection]])
+
+m4_pattern_allow([^m4_errprintn$])
+
+# AT_TEST([MACRO])
+# ----------------
+# Try to have MACRO be run by bison.
+m4_pushdef([AT_TEST],
+[AT_DATA([[input.y]],
+[[%type <$1(DEAD %type)> exp
+%token <$1(DEAD %token)> a
+%initial-action
+{
+  $$;
+  $<$1(DEAD %initial-action)>$
+};
+%printer
+{
+  $$
+  $<$1(DEAD %printer)>$
+} <> <*>;
+%lex-param
+{
+  $1(DEAD %lex-param)
+};
+%parse-param
+{
+  $1(DEAD %parse-param)
+};
+%%
+exp:
+  a a[last]
+  {
+    $$;
+    $][1;
+    $<$1(DEAD action 1)>$
+    $<$1(DEAD action 2)>1
+    $<$1(DEAD action 3)>last
+    $<$1(DEAD action 4)>0
+    ;
+  };
+]])
+
+# FIXME: Provide a means to iterate over all the skeletons.
+AT_BISON_CHECK([[-d               input.y]])
+AT_BISON_CHECK([[-d -S glr.c      input.y]])
+AT_BISON_CHECK([[-d -S lalr1.cc   input.y]])
+AT_BISON_CHECK([[-d -S glr.cc     input.y]])
+AT_BISON_CHECK([[   -S lalr1.java input.y]])
+])
+
+AT_TEST([m4_errprintn])
+AT_TEST([@:>@m4_errprintn])
+
+m4_popdef([AT_TEST])
+
+AT_CLEANUP
@@ -32,6 +32,7 @@ AT_BANNER([[Java Calculator.]])
 m4_define([_AT_DATA_JAVA_CALC_Y],
 [m4_if([$1$2$3], $[1]$[2]$[3], [],
       [m4_fatal([$0: Invalid arguments: $@])])dnl
+AT_BISON_OPTION_PUSHDEFS([%language "Java" $4])
 AT_DATA([Calc.y],
 [[/* Infix notation calculator--calc */
 %language "Java"
@@ -122,20 +123,8 @@ AT_LOCATION_IF([[
  public Position getEndPos() {
    return yypos;
  }
-
-  public void yyerror (Calc.Location l, String s)
-  {
-    if (l == null)
-      System.err.println (s);
-    else
-      System.err.println (l + ": " + s);
-  }
-]], [[
-  public void yyerror (String s)
-  {
-    System.err.println (s);
-  }
 ]])[
+  ]AT_YYERROR_DEFINE[

  Integer yylval;

@@ -211,11 +200,12 @@ class Position {
 }

 ]])
+AT_BISON_OPTION_POPDEFS
 ])# _AT_DATA_JAVA_CALC_Y


 # AT_DATA_CALC_Y([BISON-OPTIONS])
-# -------------------------------------------------
+# -------------------------------
 # Produce `calc.y'.
 m4_define([AT_DATA_JAVA_CALC_Y],
 [_AT_DATA_JAVA_CALC_Y($[1], $[2], $[3], [$1])
@@ -224,7 +214,7 @@ m4_define([AT_DATA_JAVA_CALC_Y],

 # _AT_CHECK_JAVA_CALC_ERROR(BISON-OPTIONS, INPUT,
 #                           [VERBOSE-AND-LOCATED-ERROR-MESSAGE])
-# ---------------------------------------------------------
+# --------------------------------------------------------------
 # Run `calc' on INPUT, and expect a `syntax error' message.
 #
 # If INPUT starts with a slash, it is used as absolute input file name,
@@ -729,8 +719,8 @@ AT_SETUP([Java stype, position_class and location_class])
 AT_CHECK_JAVA_MINIMAL([[
 %define stype "java.awt.Color"
 %type<java.awt.Color> start;
-%define location_type "MyLoc"
-%define position_type "MyPos"
+%define api.location.type "MyLoc"
+%define api.position.type "MyPos"
 %code { class MyPos {} }]], [[$$ = $<java.awt.Color>1;]], [[MyPos]])
 AT_CHECK([[grep 'java.awt.Color' YYParser.java]], [0], [ignore])
 AT_CHECK([[$EGREP -v ' */?\*' YYParser.java | grep 'Position']], [1], [ignore])
@@ -739,8 +729,8 @@ AT_CHECK([[$EGREP -v ' */?\*' YYParser.java | grep 'Location']], [1], [ignore])
 AT_CHECK_JAVA_MINIMAL_W_LEXER([[
 %define stype "java.awt.Color"
 %type<java.awt.Color> start;
-%define location_type "MyLoc"
-%define position_type "MyPos"
+%define api.location.type "MyLoc"
+%define api.position.type "MyPos"
 %code { class MyPos {} }]], [], [[return EOF;]], [],
 [[$$ = $<java.awt.Color>1;]],
 [[java.awt.Color]], [[MyPos]], [[MyLoc]])
@@ -17,10 +17,18 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

-# We want a recent Autotest.
 m4_version_prereq([2.58])


+# m4_null_if(VAL, IF-TRUE, IF-FALSE)
+# ----------------------------------
+# If VAL evaluates to empty or 0, run IF-TRUE, otherwise IF-FALSE.
+m4_define([m4_null_if],
+[m4_case(m4_quote($1),
+         [0], [$2],
+         [],  [$2],
+         [$3])])
+
 ## ------------- ##
 ## Basic tests.  ##
 ## ------------- ##
@@ -30,7 +38,7 @@ m4_version_prereq([2.58])
 # Expect COUNT matches of the PERL-REGEXP in FILE.  The file is
 # taken in "slurp" mode, i.e., one can match end-of-lines.
 m4_define([AT_MATCHES_CHECK],
-[AT_CHECK([perl -0777 -ne '
+[AT_CHECK([$PERL -0777 -ne '
 my $count = 0;
 s{$2}{ ++$count; "" }gem;
 printf "$count\n";' $1], [0], [$3
@@ -45,6 +53,8 @@ m4_divert_text([PREPARE_TESTS],
 {
  for at_save_file in stderr experr expout
  do
+    test ! -f at-bison-check-$at_save_file.bak ||
+      as_fn_error 1 "fatal error: back-up on top of a back-up"
    test ! -f $at_save_file || mv $at_save_file at-bison-check-$at_save_file.bak
  done
 }
@@ -91,7 +101,8 @@ m4_popdef([AT_LOC_LAST_COLUMN])])
 # AT_BISON_OPTION_PUSHDEFS([BISON-OPTIONS])
 # -----------------------------------------
 m4_define([AT_BISON_OPTION_PUSHDEFS],
-[_AT_BISON_OPTION_PUSHDEFS($[1], $[2], [$1])])
+[m4_divert_text([KILL],
+                [_AT_BISON_OPTION_PUSHDEFS($[1], $[2], [$1])])])


 # _AT_BISON_OPTION_PUSHDEFS($1, $2, [BISON-OPTIONS])
@@ -108,8 +119,13 @@ m4_pushdef([AT_SKEL_CC_IF],
 [m4_bmatch([$3], [%language "[Cc]\+\+"\|%skeleton "[a-z0-9]+\.cc"], [$1], [$2])])
 m4_pushdef([AT_SKEL_JAVA_IF],
 [m4_bmatch([$3], [%language "[Jj][Aa][Vv][Aa]"\|%skeleton "[a-z0-9]+\.java"], [$1], [$2])])
+# The target language: "c", "c++", or "java".
+m4_pushdef([AT_LANG],
+[AT_SKEL_JAVA_IF([java],
+                 [AT_SKEL_CC_IF([c++],
+                                [c])])])
 m4_pushdef([AT_GLR_IF],
-[m4_bmatch([$3], [%glr-parser\|%skeleton "glr\.], [$1], [$2])])
+[m4_bmatch([$3], [%glr-parser\|%skeleton "glr\..*"], [$1], [$2])])
 m4_pushdef([AT_LALR1_CC_IF],
 [AT_SKEL_CC_IF([AT_GLR_IF([$2], [$1])], [$2])])
 m4_pushdef([AT_GLR_CC_IF],
@@ -122,32 +138,52 @@ m4_pushdef([AT_LEXPARAM_IF],
 m4_pushdef([AT_LOCATION_IF],
 [m4_bmatch([$3], [%locations], [$1], [$2])])
 m4_pushdef([AT_LOCATION_TYPE_IF],
-[m4_bmatch([$3], [%define location_type], [$1], [$2])])
+[m4_bmatch([$3], [%define \(api\.location\.type\|location_type\)], [$1], [$2])])
 m4_pushdef([AT_PARAM_IF],
 [m4_bmatch([$3], [%parse-param], [$1], [$2])])
+# Comma-terminated list of formals parse-parameters.
+# E.g., %parse-param { int x } {int y} -> "int x, int y, ".
+m4_pushdef([AT_PARSE_PARAMS])
+m4_bpatsubst([$3], [%parse-param { *\([^{}]*[^{} ]\) *}],
+             [m4_append([AT_PARSE_PARAMS], [\1, ])])
+
 m4_pushdef([AT_PURE_IF],
 [m4_bmatch([$3], [%define  *api\.pure\|%pure-parser],
           [m4_bmatch([$3], [%define  *api\.pure *"?false"?], [$2], [$1])],
           [$2])])
-m4_pushdef([AT_PURE_AND_LOC_IF],
-[m4_bmatch([$3], [%locations], [AT_PURE_IF($@)], [$2])])
-m4_pushdef([AT_GLR_OR_PARAM_IF],
-[m4_bmatch([$3], [%glr-parser\|%parse-param], [$1], [$2])])
 m4_pushdef([AT_NAME_PREFIX],
-[m4_bmatch([$3], [%name-prefix ".*"],
-           [m4_bregexp([$3], [name-prefix "\([^"]*\)"], [\1])],
+[m4_bmatch([$3], [\(%define api\.prefix\|%name-prefix\) ".*"],
+           [m4_bregexp([$3], [\(%define api\.prefix\|%name-prefix\) "\([^""]*\)"], [\2])],
           [yy])])
-# yyerror receives the location if %location & %pure & (%glr or %parse-param).
+m4_pushdef([AT_API_prefix],
+[m4_bmatch([$3], [%define api\.prefix ".*"],
+           [m4_bregexp([$3], [%define api\.prefix "\([^""]*\)"], [\1])],
+           [yy])])
+m4_pushdef([AT_API_PREFIX],
+[m4_toupper(AT_API_prefix)])
+# yyerror receives the location if %location, and if the parser is pure. For
+# historical reasons, with the "yacc.c" skeleton, the location is not passed
+# unless an additional "%parse-param" is present, or if the purity is defined
+# as "full".
 m4_pushdef([AT_YYERROR_ARG_LOC_IF],
-[AT_GLR_OR_PARAM_IF([AT_PURE_AND_LOC_IF([$1], [$2])],
-		    [$2])])
-# yyerror always sees the locations (when activated), except if
-# (yacc & pure & !param).  FIXME: This is wrong.  See the manual.
+[AT_LOCATION_IF([AT_PURE_IF([m4_bmatch([$3],
+                                       m4_quote(m4_join([\|],
+                                                        [%define api.pure "?full"?],
+                                                        [%glr-parser],
+                                                        [%parse-param],
+                                                        [%skeleton "?glr.c"?])),
+                                       [$1], [$2])],
+                            [$2])],
+                [$2])])
+
+# yyerror always sees the locations (when activated) if the parser is impure.
+# When the parser is pure, yyerror sees the location if it is received as an
+# argument.
 m4_pushdef([AT_YYERROR_SEES_LOC_IF],
-[AT_LOCATION_IF([AT_YACC_IF([AT_PURE_IF([AT_PARAM_IF([$1], [$2])],
-					[$1])],
-			    [$1])],
-		[$2])])
+[AT_LOCATION_IF([AT_YACC_IF([AT_PURE_IF([AT_YYERROR_ARG_LOC_IF([$1], [$2])],
+                                        [$1])],
+                            [$1])],
+                [$2])])

 # The interface is pure: either because %define api.pure, or because we
 # are using the C++ parsers.
@@ -155,27 +191,35 @@ m4_pushdef([AT_PURE_LEX_IF],
 [AT_PURE_IF([$1],
 	    [AT_SKEL_CC_IF([$1], [$2])])])

+m4_pushdef([AT_YYSTYPE],
+[AT_SKEL_CC_IF([AT_NAME_PREFIX[::parser::semantic_type]],
+               [AT_API_PREFIX[STYPE]])])
+m4_pushdef([AT_YYLTYPE],
+[AT_SKEL_CC_IF([AT_NAME_PREFIX[::parser::location_type]],
+               [AT_API_PREFIX[LTYPE]])])
+
+
 AT_PURE_LEX_IF(
 [m4_pushdef([AT_LOC], [(*llocp)])
 m4_pushdef([AT_VAL], [(*lvalp)])
- m4_pushdef([AT_LEX_FORMALS],
-	    [YYSTYPE *lvalp[]AT_LOCATION_IF([, YYLTYPE *llocp])])
- m4_pushdef([AT_LEX_ARGS],
+ m4_pushdef([AT_YYLEX_FORMALS],
+	    [AT_YYSTYPE *lvalp[]AT_LOCATION_IF([, AT_YYLTYPE *llocp])])
+ m4_pushdef([AT_YYLEX_ARGS],
 	    [lvalp[]AT_LOCATION_IF([, llocp])])
 m4_pushdef([AT_USE_LEX_ARGS],
 	    [(void) lvalp;AT_LOCATION_IF([(void) llocp])])
- m4_pushdef([AT_LEX_PRE_FORMALS],
-	    [AT_LEX_FORMALS, ])
- m4_pushdef([AT_LEX_PRE_ARGS],
-	    [AT_LEX_ARGS, ])
+ m4_pushdef([AT_YYLEX_PRE_FORMALS],
+	    [AT_YYLEX_FORMALS, ])
+ m4_pushdef([AT_YYLEX_PRE_ARGS],
+	    [AT_YYLEX_ARGS, ])
 ],
 [m4_pushdef([AT_LOC], [[(]AT_NAME_PREFIX[lloc)]])
 m4_pushdef([AT_VAL], [[(]AT_NAME_PREFIX[lval)]])
- m4_pushdef([AT_LEX_FORMALS],     [void])
- m4_pushdef([AT_LEX_ARGS],        [])
+ m4_pushdef([AT_YYLEX_FORMALS],     [void])
+ m4_pushdef([AT_YYLEX_ARGS],        [])
 m4_pushdef([AT_USE_LEX_ARGS],    [])
- m4_pushdef([AT_LEX_PRE_FORMALS], [])
- m4_pushdef([AT_LEX_PRE_ARGS],    [])
+ m4_pushdef([AT_YYLEX_PRE_FORMALS], [])
+ m4_pushdef([AT_YYLEX_PRE_ARGS],    [])
 ])

 # Handle the different types of location components.
@@ -192,31 +236,36 @@ AT_SKEL_CC_IF(
 # AT_BISON_OPTION_POPDEFS
 # -----------------------
 m4_define([AT_BISON_OPTION_POPDEFS],
-[m4_popdef([AT_LEX_PRE_ARGS])
-m4_popdef([AT_LEX_PRE_FORMALS])
+[m4_divert_text([KILL],
+[m4_popdef([AT_YYLEX_PRE_ARGS])
+m4_popdef([AT_YYLEX_PRE_FORMALS])
 m4_popdef([AT_USE_LEX_ARGS])
-m4_popdef([AT_LEX_ARGS])
-m4_popdef([AT_LEX_FORMALS])
+m4_popdef([AT_YYLEX_ARGS])
+m4_popdef([AT_YYLEX_FORMALS])
+m4_popdef([AT_YYLTYPE])
+m4_popdef([AT_YYSTYPE])
 m4_popdef([AT_VAL])
 m4_popdef([AT_LOC])
 m4_popdef([AT_PURE_LEX_IF])
 m4_popdef([AT_YYERROR_SEES_LOC_IF])
 m4_popdef([AT_YYERROR_ARG_LOC_IF])
+m4_popdef([AT_API_PREFIX])
+m4_popdef([AT_API_prefix])
 m4_popdef([AT_NAME_PREFIX])
-m4_popdef([AT_GLR_OR_PARAM_IF])
-m4_popdef([AT_PURE_AND_LOC_IF])
 m4_popdef([AT_LOCATION_TYPE_IF])
 m4_popdef([AT_LOCATION_IF])
+m4_popdef([AT_PARSE_PARAMS])
 m4_popdef([AT_PARAM_IF])
 m4_popdef([AT_LEXPARAM_IF])
 m4_popdef([AT_YACC_IF])
 m4_popdef([AT_GLR_IF])
 m4_popdef([AT_SKEL_CC_IF])
+m4_popdef([AT_LANG])
 m4_popdef([AT_SKEL_JAVA_IF])
 m4_popdef([AT_GLR_CC_IF])
 m4_popdef([AT_LALR1_CC_IF])
 m4_popdef([AT_DEFINES_IF])
-AT_LOC_POPDEF
+AT_LOC_POPDEF])dnl
 ])# AT_BISON_OPTION_POPDEFS


@@ -267,8 +316,119 @@ m4_define([AT_DATA_GRAMMAR],
 $2])
 ])

+# AT_YYLEX_PROTOTYPE
+# AT_YYLEX_DECLARE_EXTERN
+# AT_YYLEX_DECLARE
+# AT_YYLEX_DEFINE([INPUT], [ACTION])
+# ----------------------------------
+# INPUT can be empty, or in double quotes, or a list (in braces).
+# ACTION may compute yylval for instance, using "res" as token type,
+# and "toknum" as the number of calls to yylex (starting at 0).
+m4_define([AT_YYLEX_PROTOTYPE],
+[int AT_NAME_PREFIX[]lex (]AT_YYLEX_FORMALS[)[]dnl
+])
+
+m4_define([AT_YYLEX_DECLARE_EXTERN],
+[AT_YYLEX_PROTOTYPE;dnl
+])
+
+m4_define([AT_YYLEX_DECLARE],
+[static AT_YYLEX_DECLARE_EXTERN[]dnl
+])
+
+m4_define([AT_YYLEX_DEFINE],
+[[#include <assert.h>
+static
+]AT_YYLEX_PROTOTYPE[
+{
+  ]m4_bmatch([$1], [^\(".*"\)?$],
+             [[static char const input[] = ]m4_default([$1], [""])],
+             [[static int const input[] = ]$1])[;
+  static size_t toknum = 0;
+  int res;
+  ]AT_USE_LEX_ARGS[;
+  assert (toknum < sizeof input / sizeof input[0]);
+  res = input[toknum++];
+  ]$2[;]AT_LOCATION_IF([[
+  ]AT_LOC_FIRST_LINE[ = ]AT_LOC_LAST_LINE[ = 1;
+  ]AT_LOC_FIRST_COLUMN[ = ]AT_LOC_LAST_COLUMN[ = toknum;]])[
+  return res;
+}]dnl
+])
+
+# AT_YYERROR_FORMALS
+# AT_YYERROR_PROTOTYPE
+# AT_YYERROR_DECLARE_EXTERN
+# AT_YYERROR_DECLARE
+# AT_YYERROR_DEFINE
+# -------------------------
+# Must be called inside a AT_BISON_OPTION_PUSHDEFS/POPDEFS pair.
+m4_define([AT_YYERROR_FORMALS],
+[m4_case(AT_LANG,
+[c], [AT_YYERROR_ARG_LOC_IF([AT_YYLTYPE const * const llocp, ])AT_PARSE_PARAMS [const char *msg]])[]dnl
+])
+
+m4_define([AT_YYERROR_PROTOTYPE],
+[m4_case(AT_LANG,
+[c], [[void ]AT_NAME_PREFIX[error (]AT_YYERROR_FORMALS[)]])[]dnl
+])
+
+m4_define([AT_YYERROR_DECLARE_EXTERN],
+[m4_case(AT_LANG,
+[c], [AT_YYERROR_PROTOTYPE;])[]dnl
+])
+
+m4_define([AT_YYERROR_DECLARE],
+[m4_case(AT_LANG,
+[c], [static AT_YYERROR_DECLARE_EXTERN])[]dnl
+])
+
+m4_define([AT_YYERROR_DEFINE],
+[m4_case(AT_LANG,
+[c], [[#include <stdio.h>
+/* A C error reporting function.  */
+static
+]AT_YYERROR_PROTOTYPE[
+{]m4_bpatsubst(m4_defn([AT_PARSE_PARAMS]),
+              [[^,]+[^A-Za-z_0-9]\([A-Za-z_][A-Za-z_0-9]*\), *], [
+  YYUSE(\1);])dnl
+AT_YYERROR_SEES_LOC_IF([[
+  YY_LOCATION_PRINT (stderr, ]AT_LOC[);
+  fprintf (stderr, ": ");]])[
+  fprintf (stderr, "%s\n", msg);
+}]],
+[c++], [[/* A C++ error reporting function.  */
+void
+]AT_NAME_PREFIX[::parser::error (const location_type& l, const std::string& m)
+{
+  (void) l;
+  std::cerr << ]AT_LOCATION_IF([l << ": " << ])[m << std::endl;
+}]],
+[java], [AT_LOCATION_IF([[public void yyerror (Calc.Location l, String s)
+  {
+    if (l == null)
+      System.err.println (s);
+    else
+      System.err.println (l + ": " + s);
+  }
+]], [[
+  public void yyerror (String s)
+  {
+    System.err.println (s);
+  }]])],
+[m4_fatal([$0: invalid language: ]AT_LANG)])dnl
+])
+
+
+## --------------- ##
+## Running Bison.  ##
+## --------------- ##
+
 # AT_BISON_CHECK(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
 # -------------------------------------------------
+# High-level routine that may call bison several times, under different
+# conditions.
+#
 # Check Bison by invoking `bison BISON_ARGS'.  BISON_ARGS should not contain
 # shell constructs (such as redirection or pipes) that would prevent
 # appending additional command-line arguments for bison. OTHER_AT_CHECK_ARGS
@@ -289,83 +449,93 @@ $2])
 #
 #   4. If stderr contains a warning, -Wnone and --warnings=none suppress it.
 m4_define([AT_BISON_CHECK],
-[m4_if(m4_quote($2), [0], [AT_BISON_CHECK_XML($@)],
-       m4_quote($2), [], [AT_BISON_CHECK_XML($@)])
+[m4_null_if([$2], [AT_BISON_CHECK_XML($@)])
 AT_BISON_CHECK_NO_XML($@)])

 m4_define([AT_BISON_WERROR_MSG],
          [[bison: warnings being treated as errors]])

+
+# AT_BISON_CHECK_(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
+# --------------------------------------------------
+# Low-level macro to run bison once.
+m4_define([AT_BISON_CHECK_],
+[AT_CHECK(AT_QUELL_VALGRIND[[ bison ]]$@)])
+
+
+# AT_BISON_CHECK_WARNINGS(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
+# ----------------------------------------------------------
+# Check that warnings (if some are expected) are correctly
+# turned into errors with -Werror, etc.
+m4_define([AT_BISON_CHECK_WARNINGS],
+[m4_if(m4_bregexp([$4], [: warning: ]), [-1], [],
+      [m4_null_if([$2], [AT_BISON_CHECK_WARNINGS_($@)])])])
+
+m4_define([AT_BISON_CHECK_WARNINGS_],
+[[# Defining POSIXLY_CORRECT causes bison to complain if options are
+# added after the grammar file name, so skip these checks in that
+# case.
+if test "$POSIXLY_CORRECT_IS_EXPORTED" = false; then
+  ]AT_SAVE_SPECIAL_FILES[
+
+  # To avoid expanding it repeatedly, store specified stdout.
+  ]AT_DATA([expout], [$3])[
+
+  # Run with -Werror.
+  ]AT_BISON_CHECK_([$1[ -Werror]], [[1]], [expout], [stderr])[
+
+  # Build expected stderr up to and including the "warnings being
+  # treated as errors" message.
+  ]AT_DATA([[at-bison-check-warnings]], [$4])[
+  at_bison_check_first=`sed -n \
+    '/: warning: /{=;q;}' at-bison-check-warnings`
+  : ${at_bison_check_first:=1}
+  at_bison_check_first_tmp=`sed -n \
+    '/conflicts: [0-9].*reduce$/{=;q;}' at-bison-check-warnings`
+  : ${at_bison_check_first_tmp:=1}
+  if test $at_bison_check_first_tmp -lt $at_bison_check_first; then
+    at_bison_check_first=$at_bison_check_first_tmp
+  fi
+  if test $at_bison_check_first -gt 1; then
+    sed -n "1,`expr $at_bison_check_first - 1`"p \
+      at-bison-check-warnings > experr
+  fi
+  echo ']AT_BISON_WERROR_MSG[' >> experr
+
+  # Finish building expected stderr and check.  Unlike warnings,
+  # complaints cause bison to exit early.  Thus, with -Werror, bison
+  # does not necessarily report all warnings that it does without
+  # -Werror, but it at least reports one.
+  at_bison_check_last=`sed -n '$=' stderr`
+  : ${at_bison_check_last:=1}
+  at_bison_check_last=`expr $at_bison_check_last - 1`
+  sed -n "$at_bison_check_first,$at_bison_check_last"p \
+    at-bison-check-warnings >> experr
+  ]AT_CHECK([[sed 's,.*/\(]AT_BISON_WERROR_MSG[\)$,\1,' \
+              stderr 1>&2]], [[0]], [[]], [experr])[
+
+  # Now check --warnings=error.
+  cp stderr experr
+  ]AT_BISON_CHECK_([$1[ --warnings=error]], [[1]], [expout], [experr])[
+
+  # Now check -Wnone and --warnings=none by making sure that
+  # -Werror doesn't change the exit status when -Wnone or
+  # --warnings=none is specified.
+  ]AT_BISON_CHECK_([$1[ -Wnone -Werror]], [[0]], [expout])[
+  ]AT_BISON_CHECK_([$1[ --warnings=none -Werror]], [[0]], [expout])[
+
+  ]AT_RESTORE_SPECIAL_FILES[
+fi]dnl
+])
+
 # AT_BISON_CHECK_NO_XML(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
 # --------------------------------------------------------
 # Same as AT_BISON_CHECK except don't perform XML/XSLT checks.  This is useful
 # when a tortured grammar's XML is known to be too large for xsltproc to
 # handle.
 m4_define([AT_BISON_CHECK_NO_XML],
-[AT_CHECK(m4_if(m4_quote($2), [0], [], m4_quote($2), [], [],
-                [AT_QUELL_VALGRIND ])[[bison ]]$@)
-m4_if(m4_bregexp([$4], [: warning: ]), [-1], [],
-      m4_quote(m4_if(m4_quote($2), [], [0], [$2])), [0], [[
-        # Defining POSIXLY_CORRECT causes bison to complain if options
-        # are added after the grammar file name, so skip these checks
-        # in that case.
-        if test -z "${POSIXLY_CORRECT+set}"; then
-          ]AT_SAVE_SPECIAL_FILES[
-
-          # To avoid expanding it repeatedly, store specified stdout.
-          ]AT_DATA([expout], [$3])[
-
-          # Run with -Werror.
-          ]AT_CHECK(AT_QUELL_VALGRIND[[ bison ]$1[ -Werror]],
-                    [[1]], [expout], [stderr])[
-
-          # Build expected stderr up to and including the "warnings being
-          # treated as errors" message.
-          ]AT_DATA([[at-bison-check-warnings]], [$4])[
-          at_bison_check_first=`sed -n \
-            '/: warning: /{=;q;}' at-bison-check-warnings`
-          : ${at_bison_check_first:=1}
-          at_bison_check_first_tmp=`sed -n \
-            '/conflicts: [0-9].*reduce$/{=;q;}' at-bison-check-warnings`
-          : ${at_bison_check_first_tmp:=1}
-          if test $at_bison_check_first_tmp -lt $at_bison_check_first; then
-            at_bison_check_first=$at_bison_check_first_tmp
-          fi
-          if test $at_bison_check_first -gt 1; then
-            sed -n "1,`expr $at_bison_check_first - 1`"p \
-              at-bison-check-warnings > experr
-          fi
-          echo ']AT_BISON_WERROR_MSG[' >> experr
-
-          # Finish building expected stderr and check.  Unlike warnings,
-          # complaints cause bison to exit early.  Thus, with -Werror, bison
-          # does not necessarily report all warnings that it does without
-          # -Werror, but it at least reports one.
-          at_bison_check_last=`sed -n '$=' stderr`
-          : ${at_bison_check_last:=1}
-          at_bison_check_last=`expr $at_bison_check_last - 1`
-          sed -n "$at_bison_check_first,$at_bison_check_last"p \
-            at-bison-check-warnings >> experr
-          ]AT_CHECK([[sed 's,.*/\(]AT_BISON_WERROR_MSG[\)$,\1,' \
-                      stderr 1>&2]], [[0]], [[]], [experr])[
-
-          # Now check --warnings=error.
-          cp stderr experr
-          ]AT_CHECK(AT_QUELL_VALGRIND[[ bison ]$1[ --warnings=error]],
-                    [[1]], [expout], [experr])[
-
-          # Now check -Wnone and --warnings=none by making sure that
-          # -Werror doesn't change the exit status when -Wnone or
-          # --warnings=none is specified.
-          ]AT_CHECK(AT_QUELL_VALGRIND[[ bison ]$1[ -Wnone -Werror]],
-                    [[0]], [expout])[
-          ]AT_CHECK(AT_QUELL_VALGRIND[[ bison ]$1[ --warnings=none \
-                    -Werror]], [[0]], [expout])[
-
-          ]AT_RESTORE_SPECIAL_FILES[
-        fi
-      ]])
-])
+[AT_CHECK(m4_null_if([$2], [], [AT_QUELL_VALGRIND ])[[bison ]]$@)
+AT_BISON_CHECK_WARNINGS($@)])

 # AT_BISON_CHECK_XML(BISON_ARGS, [OTHER_AT_CHECK_ARGS])
 # -----------------------------------------------------
@@ -383,20 +553,20 @@ m4_define([AT_BISON_CHECK_XML],
                            [--xml=[^][ ]*], [])])dnl
  # Don't combine these Bison invocations since we want to be sure that
  # --report=all isn't required to get the full XML file.
-  AT_CHECK([[bison --report=all --report-file=xml-tests/test.output \
-             --graph=xml-tests/test.dot ]]AT_BISON_ARGS,
-           [[0]], [ignore], [ignore])
-  AT_CHECK([[bison --xml=xml-tests/test.xml ]]AT_BISON_ARGS,
-           [[0]], [ignore], [ignore])
+  AT_BISON_CHECK_([[--report=all --report-file=xml-tests/test.output \
+                  --graph=xml-tests/test.dot ]]AT_BISON_ARGS,
+                  [[0]], [ignore], [ignore])
+  AT_BISON_CHECK_([[--xml=xml-tests/test.xml ]]AT_BISON_ARGS,
+                 [[0]], [ignore], [ignore])
  m4_popdef([AT_BISON_ARGS])dnl
  [cp xml-tests/test.output expout]
  AT_CHECK([[$XSLTPROC \
             `]]AT_QUELL_VALGRIND[[ bison --print-datadir`/xslt/xml2text.xsl \
             xml-tests/test.xml]], [[0]], [expout])
-  [cp xml-tests/test.dot expout]
+  [sort xml-tests/test.dot > expout]
  AT_CHECK([[$XSLTPROC \
             `]]AT_QUELL_VALGRIND[[ bison --print-datadir`/xslt/xml2dot.xsl \
-             xml-tests/test.xml]], [[0]], [expout])
+             xml-tests/test.xml | sort]], [[0]], [expout])
  [rm -rf xml-tests expout]
  AT_RESTORE_SPECIAL_FILES
 [fi]])
@@ -415,6 +585,8 @@ m4_define([AT_BISON_CHECK_XML],
 m4_define([AT_QUELL_VALGRIND],
 [[[VALGRIND_OPTS="$VALGRIND_OPTS --leak-check=summary --show-reachable=no"; export VALGRIND_OPTS;]]])

+
+
 ## ------------------------ ##
 ## Compiling C, C++ Files.  ##
 ## ------------------------ ##
@@ -422,21 +594,40 @@ m4_define([AT_QUELL_VALGRIND],

 # AT_COMPILE(OUTPUT, [SOURCES = OUTPUT.c])
 # ----------------------------------------
-# Compile SOURCES into OUTPUT.  If OUTPUT does not contain '.',
-# assume that we are linking too; this is a hack.
+# Compile SOURCES into OUTPUT.
+#
+# If OUTPUT does not contain '.', assume that we are linking too,
+# otherwise pass "-c"; this is a hack.  The default SOURCES is OUTPUT
+# with trailing .o removed, and ".c" appended.
 m4_define([AT_COMPILE],
-[AT_CHECK([$CC $CFLAGS $CPPFLAGS m4_bmatch([$1], [[.]], [], [$LDFLAGS ])-o $1 m4_default([$2], [$1.c])[]m4_bmatch([$1], [[.]], [], [ $LIBS])],
+[AT_CHECK([case $POSIXLY_CORRECT_IS_EXPORTED:$C_COMPILER_POSIXLY_CORRECT in
+  true:false) echo 'cannot compile properly with POSIXLY_CORRECT' && exit 77;;
+esac])
+AT_CHECK(m4_join([ ],
+                  [$CC $CFLAGS $CPPFLAGS],
+                  [m4_bmatch([$1], [[.]], [-c], [$LDFLAGS])],
+                  [-o $1],
+                  [m4_default([$2], [m4_bpatsubst([$1], [\.o$]).c])],
+                  [m4_bmatch([$1], [[.]], [], [$LIBS])]),
 	   0, [ignore], [ignore])])

 # AT_COMPILE_CXX(OUTPUT, [SOURCES = OUTPUT.cc])
-# --------------------------------------------
-# Compile SOURCES into OUTPUT.  If OUTPUT does not contain '.',
-# assume that we are linking too; this is a hack.
-# If the C++ compiler does not work, ignore the test.
+# ---------------------------------------------
+# Compile SOURCES into OUTPUT.  If the C++ compiler does not work,
+# ignore the test.
+#
+# If OUTPUT does not contain '.', assume that we are linking too,
+# otherwise pass "-c"; this is a hack.  The default SOURCES is OUTPUT
+# with trailing .o removed, and ".cc" appended.
 m4_define([AT_COMPILE_CXX],
 [AT_KEYWORDS(c++)
 AT_CHECK([$BISON_CXX_WORKS], 0, ignore, ignore)
-AT_CHECK([$CXX $CXXFLAGS $CPPFLAGS m4_bmatch([$1], [[.]], [], [$LDFLAGS ])-o $1 m4_default([$2], [$1.cc])[]m4_bmatch([$1], [[.]], [], [ $LIBS])],
+AT_CHECK(m4_join([ ],
+                 [$CXX $CXXFLAGS $CPPFLAGS],
+                 [m4_bmatch([$1], [[.]], [-c], [$LDFLAGS])],
+                 [-o $1],
+                 [m4_default([$2], [m4_bpatsubst([$1], [\.o$]).cc])],
+                 [m4_bmatch([$1], [[.]], [], [$LIBS])]),
 	 0, [ignore], [ignore])])

 # AT_JAVA_COMPILE(SOURCES)
@@ -445,32 +636,94 @@ AT_CHECK([$CXX $CXXFLAGS $CPPFLAGS m4_bmatch([$1], [[.]], [], [$LDFLAGS ])-o $1
 # is not installed.
 m4_define([AT_JAVA_COMPILE],
 [AT_KEYWORDS(java)
-AT_CHECK([[test -n "$CONF_JAVA" || exit 77
-           test -n "$CONF_JAVAC" || exit 77]])
+AT_SKIP_IF([[test -z "$CONF_JAVAC"]])
+AT_SKIP_IF([[test -z "$CONF_JAVA"]])
 AT_CHECK([[$SHELL ../../../javacomp.sh ]$1],
         [[0]], [ignore], [ignore])])

-# AT_FULL_COMPILE(OUTPUT, [OTHER])
-# --------------------------------
+# AT_LANG_COMPILE(OUTPUT, [SOURCES = OUTPUT.c]
+# --------------------------------------------
+# Compile SOURCES into OUTPUT.  Skip if compiler does not work.
+#
+# If OUTPUT does not contain '.', assume that we are linking too,
+# otherwise pass "-c"; this is a hack.  The default SOURCES is OUTPUT
+# with trailing .o removed, and ".c"/".cc" appended.
+m4_define([AT_LANG_COMPILE],
+[m4_case(AT_LANG,
+[c],    [AT_COMPILE([$1], [$2])],
+[c++],  [AT_COMPILE_CXX([$1], [$2])],
+[java], [AT_JAVA_COMPILE([$1.java], [$2])],
+        [m4_fatal([unknown language: ]m4_defn([AT_LANG]))])[]dnl
+])
+
+# AT_FULL_COMPILE(OUTPUT, [OTHER1], [OTHER2])
+# -------------------------------------------
 # Compile OUTPUT.y to OUTPUT.c, OUTPUT.cc, or OUTPUT.java, and then
 # compile it to OUTPUT or OUTPUT.class.  If OTHER is specified, compile
 # OUTPUT-OTHER.c, OUTPUT-OTHER.cc, or OUTPUT-OTHER.java to OUTPUT or
 # OUTPUT.java along with it.  Relies on AT_SKEL_CC_IF and
 # AT_SKEL_JAVA_IF.
-m4_define([AT_FULL_COMPILE], [
-  AT_SKEL_JAVA_IF([
-    AT_BISON_CHECK([[-o ]$1[.java ]$1[.y]])
-    AT_JAVA_COMPILE([$1[.java]]m4_ifval($2,
-                                        [[$1[.java ]$1[-]$2[.java]]]))
-  ], [
-    AT_SKEL_CC_IF([
-      AT_BISON_CHECK([[-o ]$1[.cc ]$1[.y]])
-      AT_COMPILE_CXX([$1]m4_ifval($2, [, [$1[.cc ]$1[-]$2[.cc]]]))
-    ], [
-      AT_BISON_CHECK([[-o ]$1[.c ]$1[.y]])
-      AT_COMPILE([$1]m4_ifval($2, [, [$1[.c ]$1[-]$2[.c]]]))
-    ])
-  ])
+m4_define([AT_FULL_COMPILE],
+[m4_case(AT_LANG,
+[java],
+  [AT_BISON_CHECK([-o $1.java $1.y])
+   AT_LANG_COMPILE([$1],
+                   m4_join([ ],
+                           [$1.java],
+                           m4_ifval($2, [[$1-$2.java]]),
+                           m4_ifval($3, [[$1-$3.java]])))],
+[c++],
+  [AT_BISON_CHECK([-o $1.cc $1.y])
+   AT_LANG_COMPILE([$1],
+                   m4_join([ ],
+                           [$1.cc],
+                           m4_ifval($2, [[$1-$2.cc]]),
+                           m4_ifval($3, [[$1-$3.cc]])))],
+[c],
+  [AT_BISON_CHECK([-o $1.c $1.y])
+   AT_LANG_COMPILE([$1],
+                   m4_join([ ],
+                           [$1.c],
+                           m4_ifval($2, [[$1-$2.c]]),
+                           m4_ifval($3, [[$1-$3.c]])))])
+])
+
+
+
+# AT_SKIP_IF_CANNOT_LINK_C_AND_CXX
+# --------------------------------
+# Check that we can link together C and C++ objects.
+m4_define([AT_SKIP_IF_CANNOT_LINK_C_AND_CXX],
+[AT_DATA([c-and-cxx.h],
+[[#ifdef __cplusplus
+extern "C"
+{
+#endif
+  int fortytwo (void);
+#ifdef __cplusplus
+}
+#endif
+]])
+AT_DATA([c-only.c],
+[[#include "c-and-cxx.h"
+int
+main (void)
+{
+  return fortytwo () == 42 ? 0 : 1;
+}
+]])
+AT_DATA([cxx-only.cc],
+[[#include "c-and-cxx.h"
+int fortytwo ()
+{
+  return 42;
+}
+]])
+AT_COMPILE([c-only.o], [c-only.c])
+AT_COMPILE_CXX([cxx-only.o], [cxx-only.cc])
+AT_CHECK([$CXX $CXXFLAGS $CPPFLAGS $LDFLAGS c-only.o cxx-only.o -o c-and-cxx ||
+          exit 77], [ignore], [ignore])
+AT_PARSER_CHECK([./c-and-cxx])
 ])


@@ -577,12 +830,12 @@ m4_define([AT_TEST_TABLES_AND_PARSE],
 [m4_pushdef([AT_COND_CASE], [m4_case([$2], $][@)])

 AT_SETUP([$1])
-
+AT_BISON_OPTION_PUSHDEFS([$4])
 AT_DATA_GRAMMAR([[input.y]],
 [[%code {
  #include <stdio.h>
-  static void yyerror (char const *msg);
-  static int yylex (void);
+  ]AT_YYERROR_DECLARE[
+  ]AT_YYLEX_DECLARE[
 }

 ]$4[
@@ -592,13 +845,7 @@ AT_DATA_GRAMMAR([[input.y]],
 ]$5[

 %%
-
-static void
-yyerror (char const *msg)
-{
-  fprintf (stderr, "%s\n", msg);
-}
-
+]AT_YYERROR_DEFINE[
 static int
 yylex (void)
 {
@@ -628,9 +875,9 @@ m4_if(m4_index(m4_quote($3), [no-xml]), -1,
                               [0], [], m4_dquote($7))

 m4_if(m4_index(m4_quote($3), [last-state]), -1,
-      [AT_CHECK([[sed -n '/^state 0$/,$p' input.output]], [[0]],
+      [AT_CHECK([[sed -n '/^State 0$/,$p' input.output]], [[0]],
                m4_dquote($8))],
-      [AT_CHECK([[sed -n 's/^state //p' input.output | tail -1]], [[0]],
+      [AT_CHECK([[sed -n 's/^State //p' input.output | tail -1]], [[0]],
                m4_dquote($8)[[
 ]])])

@@ -654,6 +901,7 @@ AT_PARSER_CHECK([[./input]],
                m4_ifval([$11], [m4_dquote($11)]),
                m4_ifval([$12], [m4_dquote($12)]))

+AT_BISON_OPTION_POPDEFS
 AT_CLEANUP

 m4_popdef([AT_COND_CASE])])
@@ -19,7 +19,7 @@
 AT_BANNER([[Named references tests.]])

 AT_SETUP([Tutorial calculator])
-
+AT_BISON_OPTION_PUSHDEFS
 AT_DATA_GRAMMAR([test.y],
 [[
 %{
@@ -33,8 +33,8 @@ FILE *input;
 static semantic_value global_result = 0;
 static int global_count = 0;
 static int power (int base, int exponent);
-static void yyerror (const char *s);
-int yylex (void);
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
 %}

 %union
@@ -49,18 +49,18 @@ int yylex (void);
 %nonassoc '='   /* comparison	       */
 %left '-' '+'
 %left '*' '/'
-%left NEG /* negation--unary minus */
+%left NEG       /* negation--unary minus */
 %right '^'      /* exponentiation        */

 %%
 input:
  line
-| input line         {  }
+| input line         {}
 ;

 line:
  '\n'
-| exp '\n'           {  }
+| exp '\n'           {}
 ;

 exp:
@@ -69,26 +69,21 @@ exp:
  {
    if ($l != $r)
      fprintf (stderr, "calc: error: %d != %d\n", $l, $r);
-   $$ = $l;
+    $$ = $l;
  }
 | exp[x] '+' { $<ival>$ = $x; } [l] exp[r]  { $$ = $<ival>l + $r;    }
-| exp[l] '-' exp[r]        { $$ = $l - $r;        }
-| exp[l] '*' exp[r]        { $$ = $l * $r;        }
+| exp[l] '-' exp[r]  { $$ = $l - $r;        }
+| exp[l] '*' exp[r]  { $$ = $l * $r;        }
 | exp[l] '/' exp[r]  { $$ = $l / $r;        }
 | '-' exp  %prec NEG { $$ = -$2;            }
-| exp[l] '^' exp[r]        { $$ = power ($l, $r); }
-| '(' exp[e] ')'        { $$ = $e;           }
+| exp[l] '^' exp[r]  { $$ = power ($l, $r); }
+| '(' exp[e] ')'     { $$ = $e;           }
 | '(' error ')'      { $$ = 1111; yyerrok;  }
 | '!'                { $$ = 0; YYERROR;     }
 | '-' error          { $$ = 0; YYERROR;     }
 ;
 %%
-
-static void yyerror (const char *s)
-{
-  fprintf (stderr, "%s\n", s);
-}
-
+]AT_YYERROR_DEFINE[
 static int get_char (void)
 {
  int res = getc (input);
@@ -119,7 +114,8 @@ static int read_signed_integer (void)
  return sign * n;
 }

-int yylex (void)
+static int
+yylex (void)
 {
  int c;
  /* Skip white space.  */
@@ -166,10 +162,8 @@ int main (int argc, const char **argv)
    }
  status = yyparse ();
  fclose (input);
-  if (global_result != result)
-    abort ();
-  if (global_count != count)
-    abort ();
+  assert (global_result == result);
+  assert (global_count == count);
  return status;
 }
 ]])
@@ -190,6 +184,7 @@ AT_DATA([input.txt],
 AT_BISON_CHECK([-o test.c test.y])
 AT_COMPILE([[test]])
 AT_PARSER_CHECK([./test input.txt], 0, [], [stderr])
+AT_BISON_OPTION_POPDEFS
 AT_CLEANUP


@@ -198,13 +193,13 @@ AT_CLEANUP


 AT_SETUP([Undefined and ambiguous references])
-
+AT_BISON_OPTION_PUSHDEFS
 AT_DATA_GRAMMAR([test.y],
 [[
 %{
 static int power (int base, int exponent);
-static void yyerror (const char *s);
-int yylex (void);
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
 %}

 %union
@@ -219,18 +214,18 @@ int yylex (void);
 %nonassoc '='   /* comparison	       */
 %left '-' '+'
 %left '*' '/'
-%left NEG /* negation--unary minus */
+%left NEG       /* negation--unary minus */
 %right '^'      /* exponentiation        */

 %%
 input:
  line
-| input line         {  }
+| input line         {}
 ;

 line:
  '\n'
-| exp '\n'           {  }
+| exp '\n'           {}
 ;

 exp:
@@ -239,14 +234,14 @@ exp:
  {
    if ($l != $r)
      fprintf (stderr, "calc: error: %d != %d\n", $l, $r);
-   $$ = $l;
+    $$ = $l;
  }
 | exp[x] '+' { $<ival>$ = $x; } [l] exp[r] { $$ = $<ival>lo9 + $r; }
 | exp[x] '-' { $<ival>$ = $x; } [l] exp[r] { $$ = $<ival>exp - $r; }
 | exp[x] '*' { $<ival>$ = $x; } [l] exp[r] { $$ = $l * $r; }
 | exp[l] '/' exp[r]  { $$ = $l / $r;        }
 | '-' exp  %prec NEG { $$ = -$2;            }
-| exp[l] '^' exp[r]        { $$ = power ($l, $r12); }
+| exp[l] '^' exp[r]  { $$ = power ($l, $r12); }
 | '(' exp ')'        { $$ = $expo;           }
 | '(' error ')'      { $$ = 1111; yyerrok;  }
 | '!'                { $$ = 0; YYERROR;     }
@@ -256,18 +251,19 @@ exp:
 ]])

 AT_BISON_CHECK([-o test.c test.y], 1, [],
-[[test.y:50.51-60: invalid reference: '$<ival>lo9'
+[[test.y:50.51-60: error: invalid reference: '$<ival>lo9'
 test.y:50.3-68:      symbol not found in production: lo9
 test.y:51.51-60: warning: misleading reference: '$<ival>exp'
-test.y:42.1-3:       warning: refers to: $exp at $$
-test.y:51.7:         warning: possibly meant: $x, hiding $exp at $1
-test.y:51.41:        warning: possibly meant: $r, hiding $exp at $4
-test.y:52.51-52: $l of 'exp' has no declared type
-test.y:55.46-49: invalid reference: '$r12'
-test.y:55.3-53:      symbol not found in production: r12
-test.y:56.29-33: invalid reference: '$expo'
+test.y:42.1-3:       refers to: $exp at $$
+test.y:51.7:         possibly meant: $x, hiding $exp at $1
+test.y:51.41:        possibly meant: $r, hiding $exp at $4
+test.y:52.51-52: error: $l of 'exp' has no declared type
+test.y:55.40-43: error: invalid reference: '$r12'
+test.y:55.3-47:      symbol not found in production: r12
+test.y:56.29-33: error: invalid reference: '$expo'
 test.y:56.3-46:      symbol not found in production: expo
 ]])
+AT_BISON_OPTION_POPDEFS
 AT_CLEANUP

 #######################################################################
@@ -282,8 +278,8 @@ foo.bar: '2'
 ]])
 AT_BISON_CHECK([-o test.c test.y], 0, [],
 [[test.y:11.22-29: warning: misleading reference: '$foo.bar'
-test.y:11.8-10:      warning: refers to: $foo at $1
-test.y:11.12-18:     warning: possibly meant: $[foo.bar] at $2
+test.y:11.8-10:      refers to: $foo at $1
+test.y:11.12-18:     possibly meant: $[foo.bar] at $2
 ]])
 AT_CLEANUP

@@ -357,46 +353,167 @@ factor:     '(' expr ')'  { $$ = $2; }
    ;
 ]])
 AT_BISON_CHECK([-o test.c test.y], 1, [],
-[[test.y:24.36-41: invalid reference: '$cond1'
+[[test.y:24.36-41: error: invalid reference: '$cond1'
 test.y:23.11-24.62:  symbol not found in production: cond1
-test.y:26.43-53: invalid reference: '$stmt.field'
+test.y:26.43-53: error: invalid reference: '$stmt.field'
 test.y:25.11-26.60:  symbol not found in production: stmt
 test.y:25.35-38:     possibly meant: $then.field, hiding $stmt.field at $4
-test.y:28.43-52: invalid reference: '$stmt.list'
+test.y:28.43-52: error: invalid reference: '$stmt.list'
 test.y:27.11-28.59:  symbol not found in production: stmt
 test.y:27.30-38:     possibly meant: $[stmt.list] at $4
-test.y:30.43-46: ambiguous reference: '$xyz'
+test.y:30.43-46: error: ambiguous reference: '$xyz'
 test.y:29.35-37:     refers to: $xyz at $4
 test.y:29.50-52:     refers to: $xyz at $6
-test.y:32.43-52: invalid reference: '$stmt.list'
+test.y:32.43-52: error: invalid reference: '$stmt.list'
 test.y:31.11-32.63:  symbol not found in production: stmt
 test.y:31.40-43:     possibly meant: $then, hiding $[stmt.list] at $4
 test.y:31.61-64:     possibly meant: $else, hiding $[stmt.list] at $6
-test.y:34.43-58: invalid reference: '$stmt.list.field'
+test.y:34.43-58: error: invalid reference: '$stmt.list.field'
 test.y:33.11-34.69:  symbol not found in production: stmt
 test.y:33.40-43:     possibly meant: $then.field, hiding $[stmt.list].field at $4
 test.y:33.61-64:     possibly meant: $else.field, hiding $[stmt.list].field at $6
-test.y:36.43-54: invalid reference: '$[stmt.list]'
+test.y:36.43-54: error: invalid reference: '$[stmt.list]'
 test.y:35.11-36.71:  symbol not found in production: stmt.list
 test.y:35.40-43:     possibly meant: $then, hiding $[stmt.list] at $4
 test.y:35.61-64:     possibly meant: $else, hiding $[stmt.list] at $6
-test.y:38.43-49: invalid reference: '$then.1'
+test.y:38.43-49: error: invalid reference: '$then.1'
 test.y:37.11-38.60:  symbol not found in production: then
 test.y:37.40-45:     possibly meant: $[then.1] at $4
-test.y:40.43-55: invalid reference: '$then.1.field'
+test.y:40.43-55: error: invalid reference: '$then.1.field'
 test.y:39.11-40.66:  symbol not found in production: then
 test.y:39.40-45:     possibly meant: $[then.1].field at $4
-test.y:42.44-50: invalid reference: '$stmt.x'
+test.y:42.44-50: error: invalid reference: '$stmt.x'
 test.y:41.12-42.57:  symbol not found in production: stmt
 test.y:41.36-41:     possibly meant: $[stmt.x].x, hiding $stmt.x at $4
 test.y:41.36-41:     possibly meant: $[stmt.x] at $4
-test.y:44.13-22: invalid reference: '$if-stmt-a'
+test.y:44.13-22: error: invalid reference: '$if-stmt-a'
 test.y:43.12-44.59:  symbol not found in production: if
 test.y:43.1-9:       possibly meant: $[if-stmt-a] at $$
-test.y:46.46-54: invalid reference: '$then-a.f'
+test.y:46.46-54: error: invalid reference: '$then-a.f'
 test.y:45.12-46.65:  symbol not found in production: then
 test.y:45.41-46:     possibly meant: $[then-a].f at $4
 ]])
+
+AT_BISON_CHECK([-fcaret -o test.c test.y], 1, [],
+[[test.y:24.36-41: error: invalid reference: '$cond1'
+           { $if_stmt1 = new IfStmt($cond1, $then.f1, $else); };
+                                    ^^^^^^
+test.y:23.11-24.62:  symbol not found in production: cond1
+ if_stmt1: IF expr[cond] THEN stmt[then] ELSE stmt.list[else] FI
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:26.43-53: error: invalid reference: '$stmt.field'
+           { $if_stmt2 = new IfStmt($cond, $stmt.field, 0); };
+                                           ^^^^^^^^^^^
+test.y:25.11-26.60:  symbol not found in production: stmt
+ if_stmt2: IF expr[cond] THEN stmt[then] FI
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:25.35-38:     possibly meant: $then.field, hiding $stmt.field at $4
+ if_stmt2: IF expr[cond] THEN stmt[then] FI
+                                   ^^^^
+test.y:28.43-52: error: invalid reference: '$stmt.list'
+           { $if_stmt3 = new IfStmt($cond, $stmt.list, 0); };
+                                           ^^^^^^^^^^
+test.y:27.11-28.59:  symbol not found in production: stmt
+ if_stmt3: IF expr[cond] THEN stmt.list FI
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:27.30-38:     possibly meant: $[stmt.list] at $4
+ if_stmt3: IF expr[cond] THEN stmt.list FI
+                              ^^^^^^^^^
+test.y:30.43-46: error: ambiguous reference: '$xyz'
+           { $if_stmt4 = new IfStmt($cond, $xyz, $cond); };
+                                           ^^^^
+test.y:29.35-37:     refers to: $xyz at $4
+ if_stmt4: IF expr[cond] THEN stmt[xyz] ELSE stmt[xyz] FI
+                                   ^^^
+test.y:29.50-52:     refers to: $xyz at $6
+ if_stmt4: IF expr[cond] THEN stmt[xyz] ELSE stmt[xyz] FI
+                                                  ^^^
+test.y:32.43-52: error: invalid reference: '$stmt.list'
+           { $if_stmt5 = new IfStmt($cond, $stmt.list, $else); };
+                                           ^^^^^^^^^^
+test.y:31.11-32.63:  symbol not found in production: stmt
+ if_stmt5: IF expr[cond] THEN stmt.list[then] ELSE stmt.list[else] FI
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:31.40-43:     possibly meant: $then, hiding $[stmt.list] at $4
+ if_stmt5: IF expr[cond] THEN stmt.list[then] ELSE stmt.list[else] FI
+                                        ^^^^
+test.y:31.61-64:     possibly meant: $else, hiding $[stmt.list] at $6
+ if_stmt5: IF expr[cond] THEN stmt.list[then] ELSE stmt.list[else] FI
+                                                             ^^^^
+test.y:34.43-58: error: invalid reference: '$stmt.list.field'
+           { $if_stmt6 = new IfStmt($cond, $stmt.list.field, $else); };
+                                           ^^^^^^^^^^^^^^^^
+test.y:33.11-34.69:  symbol not found in production: stmt
+ if_stmt6: IF expr[cond] THEN stmt.list[then] ELSE stmt.list[else] FI
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:33.40-43:     possibly meant: $then.field, hiding $[stmt.list].field at $4
+ if_stmt6: IF expr[cond] THEN stmt.list[then] ELSE stmt.list[else] FI
+                                        ^^^^
+test.y:33.61-64:     possibly meant: $else.field, hiding $[stmt.list].field at $6
+ if_stmt6: IF expr[cond] THEN stmt.list[then] ELSE stmt.list[else] FI
+                                                             ^^^^
+test.y:36.43-54: error: invalid reference: '$[stmt.list]'
+           { $if_stmt7 = new IfStmt($cond, $[stmt.list].field, $else); };
+                                           ^^^^^^^^^^^^
+test.y:35.11-36.71:  symbol not found in production: stmt.list
+ if_stmt7: IF expr[cond] THEN stmt.list[then] ELSE stmt.list[else] FI
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:35.40-43:     possibly meant: $then, hiding $[stmt.list] at $4
+ if_stmt7: IF expr[cond] THEN stmt.list[then] ELSE stmt.list[else] FI
+                                        ^^^^
+test.y:35.61-64:     possibly meant: $else, hiding $[stmt.list] at $6
+ if_stmt7: IF expr[cond] THEN stmt.list[then] ELSE stmt.list[else] FI
+                                                             ^^^^
+test.y:38.43-49: error: invalid reference: '$then.1'
+           { $if_stmt8 = new IfStmt($cond, $then.1, $else); };
+                                           ^^^^^^^
+test.y:37.11-38.60:  symbol not found in production: then
+ if_stmt8: IF expr[cond] THEN stmt.list[then.1] ELSE stmt.list[else] FI
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:37.40-45:     possibly meant: $[then.1] at $4
+ if_stmt8: IF expr[cond] THEN stmt.list[then.1] ELSE stmt.list[else] FI
+                                        ^^^^^^
+test.y:40.43-55: error: invalid reference: '$then.1.field'
+           { $if_stmt9 = new IfStmt($cond, $then.1.field, $else); };
+                                           ^^^^^^^^^^^^^
+test.y:39.11-40.66:  symbol not found in production: then
+ if_stmt9: IF expr[cond] THEN stmt.list[then.1] ELSE stmt.list[else] FI
+           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:39.40-45:     possibly meant: $[then.1].field at $4
+ if_stmt9: IF expr[cond] THEN stmt.list[then.1] ELSE stmt.list[else] FI
+                                        ^^^^^^
+test.y:42.44-50: error: invalid reference: '$stmt.x'
+           { $if_stmt10 = new IfStmt($cond, $stmt.x, 0); };
+                                            ^^^^^^^
+test.y:41.12-42.57:  symbol not found in production: stmt
+ if_stmt10: IF expr[cond] THEN stmt[stmt.x] FI
+            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:41.36-41:     possibly meant: $[stmt.x].x, hiding $stmt.x at $4
+ if_stmt10: IF expr[cond] THEN stmt[stmt.x] FI
+                                    ^^^^^^
+test.y:41.36-41:     possibly meant: $[stmt.x] at $4
+ if_stmt10: IF expr[cond] THEN stmt[stmt.x] FI
+                                    ^^^^^^
+test.y:44.13-22: error: invalid reference: '$if-stmt-a'
+           { $if-stmt-a = new IfStmt($cond, $then, $else); };
+             ^^^^^^^^^^
+test.y:43.12-44.59:  symbol not found in production: if
+ if-stmt-a: IF expr[cond] THEN stmt.list[then] ELSE stmt.list[else] FI
+            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:43.1-9:       possibly meant: $[if-stmt-a] at $$
+ if-stmt-a: IF expr[cond] THEN stmt.list[then] ELSE stmt.list[else] FI
+ ^^^^^^^^^
+test.y:46.46-54: error: invalid reference: '$then-a.f'
+           { $[if-stmt-b] = new IfStmt($cond, $then-a.f, $else); };
+                                              ^^^^^^^^^
+test.y:45.12-46.65:  symbol not found in production: then
+ if-stmt-b: IF expr[cond] THEN if-stmt-a[then-a] ELSE stmt.list[else] FI
+            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+test.y:45.41-46:     possibly meant: $[then-a].f at $4
+ if-stmt-b: IF expr[cond] THEN if-stmt-a[then-a] ELSE stmt.list[else] FI
+                                         ^^^^^^
+]])
+
 AT_CLEANUP

 #######################################################################
@@ -409,7 +526,7 @@ start: foo[] bar
  { s = $foo; }
 ]])
 AT_BISON_CHECK([-o test.c test.y], 1, [],
-[[test.y:11.12: an identifier expected
+[[test.y:11.12: error: an identifier expected
 ]])
 AT_CLEANUP

@@ -423,7 +540,7 @@ start: foo[ a d ] bar
  { s = $foo; }
 ]])
 AT_BISON_CHECK([-o test.c test.y], 1, [],
-[[test.y:11.15: unexpected identifier in bracketed name: 'd'
+[[test.y:11.15: error: unexpected identifier in bracketed name: 'd'
 ]])
 AT_CLEANUP

@@ -437,7 +554,7 @@ start: foo[/* comment */] bar
  { s = $foo; }
 ]])
 AT_BISON_CHECK([-o test.c test.y], 1, [],
-[[test.y:11.25: an identifier expected
+[[test.y:11.25: error: an identifier expected
 ]])
 AT_CLEANUP

@@ -447,14 +564,14 @@ AT_SETUP([Stray symbols in brackets])
 AT_DATA_GRAMMAR([test.y],
 [[
 %%
-start: foo[ /* aaa */ *&-.+ ] bar
+start: foo[ % /* aaa */ *&-.+\000\001\002\377 ] bar
  { s = $foo; }
 ]])
+AT_CHECK([[$PERL -pi -e 's/\\(\d{3})/chr(oct($1))/ge' test.y || exit 77]])
 AT_BISON_CHECK([-o test.c test.y], 1, [],
-[[test.y:11.23: invalid character in bracketed name: '*'
-test.y:11.24: invalid character in bracketed name: '&'
-test.y:11.25: invalid character in bracketed name: '-'
-test.y:11.27: invalid character in bracketed name: '+'
+[[test.y:11.13: error: invalid character in bracketed name: '%'
+test.y:11.25-27: error: invalid characters in bracketed name: '*&-'
+test.y:11.29-30: error: invalid characters in bracketed name: '+\0\001\002\377'
 ]])
 AT_CLEANUP

@@ -467,7 +584,7 @@ AT_DATA_GRAMMAR([test.y],
 start[a s]: foo;
 ]])
 AT_BISON_CHECK([-o test.c test.y], 1, [],
-[[test.y:11.9: unexpected identifier in bracketed name: 's'
+[[test.y:11.9: error: unexpected identifier in bracketed name: 's'
 ]])
 AT_CLEANUP

@@ -514,37 +631,37 @@ sym_a: 'a';
 sym_b: 'b';
 ]])
 AT_BISON_CHECK([-o test.c test.y], 1, [],
-[[test.y:12.22-31: invalid reference: '$sym.field'
+[[test.y:12.22-31: error: invalid reference: '$sym.field'
 test.y:12.3-35:      symbol not found in production: sym
-test.y:13.22-35: invalid reference: '$<aa>sym.field'
+test.y:13.22-35: error: invalid reference: '$<aa>sym.field'
 test.y:13.3-39:      symbol not found in production: sym
-test.y:14.22-33: invalid reference: '$[sym.field]'
+test.y:14.22-33: error: invalid reference: '$[sym.field]'
 test.y:14.3-37:      symbol not found in production: sym.field
-test.y:15.22-37: invalid reference: '$<aa>[sym.field]'
+test.y:15.22-37: error: invalid reference: '$<aa>[sym.field]'
 test.y:15.3-41:      symbol not found in production: sym.field
-test.y:16.22-25: invalid reference: '$sym'
+test.y:16.22-25: error: invalid reference: '$sym'
 test.y:16.3-29:      symbol not found in production: sym
-test.y:17.22-29: invalid reference: '$<aa>sym'
+test.y:17.22-29: error: invalid reference: '$<aa>sym'
 test.y:17.3-33:      symbol not found in production: sym
-test.y:18.22-27: invalid reference: '$[sym]'
+test.y:18.22-27: error: invalid reference: '$[sym]'
 test.y:18.3-65:      symbol not found in production before $3: sym
-test.y:18.52-61: invalid reference: '$<aa>[sym]'
+test.y:18.52-61: error: invalid reference: '$<aa>[sym]'
 test.y:18.3-65:      symbol not found in production: sym
-test.y:22.22-31: invalid reference: '$sym-field'
+test.y:22.22-31: error: invalid reference: '$sym-field'
 test.y:22.3-35:      symbol not found in production: sym
-test.y:23.22-35: invalid reference: '$<aa>sym-field'
+test.y:23.22-35: error: invalid reference: '$<aa>sym-field'
 test.y:23.3-39:      symbol not found in production: sym
-test.y:24.22-33: invalid reference: '$[sym-field]'
+test.y:24.22-33: error: invalid reference: '$[sym-field]'
 test.y:24.3-37:      symbol not found in production: sym-field
-test.y:25.22-37: invalid reference: '$<aa>[sym-field]'
+test.y:25.22-37: error: invalid reference: '$<aa>[sym-field]'
 test.y:25.3-41:      symbol not found in production: sym-field
-test.y:26.22-25: invalid reference: '$sym'
+test.y:26.22-25: error: invalid reference: '$sym'
 test.y:26.3-29:      symbol not found in production: sym
-test.y:27.22-29: invalid reference: '$<aa>sym'
+test.y:27.22-29: error: invalid reference: '$<aa>sym'
 test.y:27.3-33:      symbol not found in production: sym
-test.y:28.22-27: invalid reference: '$[sym]'
+test.y:28.22-27: error: invalid reference: '$[sym]'
 test.y:28.3-65:      symbol not found in production before $3: sym
-test.y:28.52-61: invalid reference: '$<aa>[sym]'
+test.y:28.52-61: error: invalid reference: '$<aa>[sym]'
 test.y:28.3-65:      symbol not found in production: sym
 ]])
 AT_CLEANUP
@@ -562,10 +679,10 @@ start:
 .field: ;
 ]])
 AT_BISON_CHECK([[test.y]], [[1]], [],
-[[test.y:4.12-18: invalid reference: '$.field'
+[[test.y:4.12-18: error: invalid reference: '$.field'
 test.y:4.13:        syntax error after '$', expecting integer, letter, '_', '@<:@', or '$'
 test.y:4.3-8:       possibly meant: $[.field] at $1
-test.y:5.12-18: invalid reference: '@.field'
+test.y:5.12-18: error: invalid reference: '@.field'
 test.y:5.13:        syntax error after '@', expecting integer, letter, '_', '@<:@', or '$'
 ]])
 AT_DATA([[test.y]],
@@ -171,15 +171,16 @@ AT_CHECK_CONFLICTING_OUTPUT([foo.y],
 ])

 AT_CHECK_CONFLICTING_OUTPUT([foo.y], [], [-o foo.y],
-[foo.y: refusing to overwrite the input file 'foo.y'
+[foo.y: error: refusing to overwrite the input file 'foo.y'
 ], 1)


 # AT_CHECK_OUTPUT_FILE_NAME(FILE-NAME-PREFIX, [ADDITIONAL-TESTS])
-# -----------------------------------------------------------------------------
+# ---------------------------------------------------------------
 m4_define([AT_CHECK_OUTPUT_FILE_NAME],
 [AT_SETUP([Output file name: $1])

+AT_BISON_OPTION_PUSHDEFS
 # Skip if platform doesn't support file name.  For example, Cygwin
 # doesn't support file names containing ":" or "\".
 AT_CHECK([[touch "]AS_ESCAPE([$1[.tmp]])[" || exit 77]])
@@ -187,8 +188,8 @@ AT_CHECK([[touch "]AS_ESCAPE([$1[.tmp]])[" || exit 77]])
 AT_DATA_GRAMMAR([glr.y],
 [[%glr-parser
 %code {
-  int yylex (void);
-  void yyerror (const char *);
+]AT_YYERROR_DECLARE_EXTERN[
+]AT_YYLEX_DECLARE_EXTERN[
 }
 %%
 start: {};
@@ -209,6 +210,7 @@ AT_CHECK([ls "AS_ESCAPE([$1.c])" "AS_ESCAPE([$1.h])"], [], [ignore])
 AT_COMPILE_CXX([cxx.o], [-c "AS_ESCAPE([$1.c])"])
 $2

+AT_BISON_OPTION_POPDEFS
 AT_CLEANUP
 ])

@@ -229,3 +231,368 @@ AT_CHECK_OUTPUT_FILE_NAME([[@{]])
 AT_CHECK_OUTPUT_FILE_NAME([[@}]])
 AT_CHECK_OUTPUT_FILE_NAME([[@<:@]])
 AT_CHECK_OUTPUT_FILE_NAME([[@:>@]])
+
+
+# AT_TEST(SETUP-NAME, GRAMMAR, DOT-BODY)
+# --------------------------------------
+# Check that the DOT graph for GRAMMAR is DOT-BODY.
+m4_pushdef([AT_TEST],
+[AT_SETUP([$1])
+AT_KEYWORDS([[graph]])
+AT_DATA([[input.y]], [$2])
+AT_BISON_CHECK([[-rall --graph input.y]], [0], [[]], [[ignore]])
+AT_CHECK([[grep -v // input.dot]], [0],
+[[
+digraph "input.y"
+{
+  node [fontname = courier, shape = box, colorscheme = paired6]
+  edge [fontname = courier]
+  ]$3[}
+]])
+AT_CLEANUP
+])
+
+
+## ------------------------ ##
+## Graph with no conflicts. ##
+## ------------------------ ##
+
+AT_TEST([Graph with no conflicts],
+[[%%
+exp: a '?' b;
+a: ;
+b: 'b';
+]],
+[[
+  0 [label="State 0\n\l  0 $accept: . exp $end\l  1 exp: . a '?' b\l  2 a: .\l"]
+  0 -> 1 [style=dashed label="exp"]
+  0 -> 2 [style=dashed label="a"]
+  0 -> "0R2" [style=solid]
+ "0R2" [label="R2", fillcolor=3, shape=diamond, style=filled]
+  1 [label="State 1\n\l  0 $accept: exp . $end\l"]
+  1 -> 3 [style=solid label="$end"]
+  2 [label="State 2\n\l  1 exp: a . '?' b\l"]
+  2 -> 4 [style=solid label="'?'"]
+  3 [label="State 3\n\l  0 $accept: exp $end .\l"]
+  3 -> "3R0" [style=solid]
+ "3R0" [label="Acc", fillcolor=1, shape=diamond, style=filled]
+  4 [label="State 4\n\l  1 exp: a '?' . b\l  3 b: . 'b'\l"]
+  4 -> 5 [style=solid label="'b'"]
+  4 -> 6 [style=dashed label="b"]
+  5 [label="State 5\n\l  3 b: 'b' .\l"]
+  5 -> "5R3" [style=solid]
+ "5R3" [label="R3", fillcolor=3, shape=diamond, style=filled]
+  6 [label="State 6\n\l  1 exp: a '?' b .\l"]
+  6 -> "6R1" [style=solid]
+ "6R1" [label="R1", fillcolor=3, shape=diamond, style=filled]
+]])
+
+## ------------------------ ##
+## Graph with unsolved S/R. ##
+## ------------------------ ##
+
+AT_TEST([Graph with unsolved S/R],
+[[%%
+start:
+    'a'
+  | empty_a 'a'
+  | 'b'
+  | empty_b 'b'
+  | 'c'
+  | empty_c 'c'
+  ;
+empty_a: %prec 'a';
+empty_b: %prec 'b';
+empty_c: %prec 'c';
+]],
+[[
+  0 [label="State 0\n\l  0 $accept: . start $end\l  1 start: . 'a'\l  2      | . empty_a 'a'\l  3      | . 'b'\l  4      | . empty_b 'b'\l  5      | . 'c'\l  6      | . empty_c 'c'\l  7 empty_a: .  ['a']\l  8 empty_b: .  ['b']\l  9 empty_c: .  ['c']\l"]
+  0 -> 1 [style=solid label="'a'"]
+  0 -> 2 [style=solid label="'b'"]
+  0 -> 3 [style=solid label="'c'"]
+  0 -> 4 [style=dashed label="start"]
+  0 -> 5 [style=dashed label="empty_a"]
+  0 -> 6 [style=dashed label="empty_b"]
+  0 -> 7 [style=dashed label="empty_c"]
+  0 -> "0R7d" [label="['a']", style=solid]
+ "0R7d" [label="R7", fillcolor=5, shape=diamond, style=filled]
+  0 -> "0R8d" [label="['b']", style=solid]
+ "0R8d" [label="R8", fillcolor=5, shape=diamond, style=filled]
+  0 -> "0R9d" [label="['c']", style=solid]
+ "0R9d" [label="R9", fillcolor=5, shape=diamond, style=filled]
+  1 [label="State 1\n\l  1 start: 'a' .\l"]
+  1 -> "1R1" [style=solid]
+ "1R1" [label="R1", fillcolor=3, shape=diamond, style=filled]
+  2 [label="State 2\n\l  3 start: 'b' .\l"]
+  2 -> "2R3" [style=solid]
+ "2R3" [label="R3", fillcolor=3, shape=diamond, style=filled]
+  3 [label="State 3\n\l  5 start: 'c' .\l"]
+  3 -> "3R5" [style=solid]
+ "3R5" [label="R5", fillcolor=3, shape=diamond, style=filled]
+  4 [label="State 4\n\l  0 $accept: start . $end\l"]
+  4 -> 8 [style=solid label="$end"]
+  5 [label="State 5\n\l  2 start: empty_a . 'a'\l"]
+  5 -> 9 [style=solid label="'a'"]
+  6 [label="State 6\n\l  4 start: empty_b . 'b'\l"]
+  6 -> 10 [style=solid label="'b'"]
+  7 [label="State 7\n\l  6 start: empty_c . 'c'\l"]
+  7 -> 11 [style=solid label="'c'"]
+  8 [label="State 8\n\l  0 $accept: start $end .\l"]
+  8 -> "8R0" [style=solid]
+ "8R0" [label="Acc", fillcolor=1, shape=diamond, style=filled]
+  9 [label="State 9\n\l  2 start: empty_a 'a' .\l"]
+  9 -> "9R2" [style=solid]
+ "9R2" [label="R2", fillcolor=3, shape=diamond, style=filled]
+  10 [label="State 10\n\l  4 start: empty_b 'b' .\l"]
+  10 -> "10R4" [style=solid]
+ "10R4" [label="R4", fillcolor=3, shape=diamond, style=filled]
+  11 [label="State 11\n\l  6 start: empty_c 'c' .\l"]
+  11 -> "11R6" [style=solid]
+ "11R6" [label="R6", fillcolor=3, shape=diamond, style=filled]
+]])
+
+## ---------------------- ##
+## Graph with solved S/R. ##
+## ---------------------- ##
+
+AT_TEST([Graph with solved S/R],
+[[%left 'a'
+%right 'b'
+%right 'c'
+%%
+start:
+    'a'
+  | empty_a 'a'
+  | 'b'
+  | empty_b 'b'
+  | 'c'
+  | empty_c 'c'
+  ;
+empty_a: %prec 'a';
+empty_b: %prec 'b';
+empty_c: %prec 'c';
+]],
+[[
+  0 [label="State 0\n\l  0 $accept: . start $end\l  1 start: . 'a'\l  2      | . empty_a 'a'\l  3      | . 'b'\l  4      | . empty_b 'b'\l  5      | . 'c'\l  6      | . empty_c 'c'\l  7 empty_a: .  ['a']\l  8 empty_b: .  []\l  9 empty_c: .  []\l"]
+  0 -> 1 [style=solid label="'b'"]
+  0 -> 2 [style=solid label="'c'"]
+  0 -> 3 [style=dashed label="start"]
+  0 -> 4 [style=dashed label="empty_a"]
+  0 -> 5 [style=dashed label="empty_b"]
+  0 -> 6 [style=dashed label="empty_c"]
+  0 -> "0R7" [style=solid]
+ "0R7" [label="R7", fillcolor=3, shape=diamond, style=filled]
+  1 [label="State 1\n\l  3 start: 'b' .\l"]
+  1 -> "1R3" [style=solid]
+ "1R3" [label="R3", fillcolor=3, shape=diamond, style=filled]
+  2 [label="State 2\n\l  5 start: 'c' .\l"]
+  2 -> "2R5" [style=solid]
+ "2R5" [label="R5", fillcolor=3, shape=diamond, style=filled]
+  3 [label="State 3\n\l  0 $accept: start . $end\l"]
+  3 -> 7 [style=solid label="$end"]
+  4 [label="State 4\n\l  2 start: empty_a . 'a'\l"]
+  4 -> 8 [style=solid label="'a'"]
+  5 [label="State 5\n\l  4 start: empty_b . 'b'\l"]
+  5 -> 9 [style=solid label="'b'"]
+  6 [label="State 6\n\l  6 start: empty_c . 'c'\l"]
+  6 -> 10 [style=solid label="'c'"]
+  7 [label="State 7\n\l  0 $accept: start $end .\l"]
+  7 -> "7R0" [style=solid]
+ "7R0" [label="Acc", fillcolor=1, shape=diamond, style=filled]
+  8 [label="State 8\n\l  2 start: empty_a 'a' .\l"]
+  8 -> "8R2" [style=solid]
+ "8R2" [label="R2", fillcolor=3, shape=diamond, style=filled]
+  9 [label="State 9\n\l  4 start: empty_b 'b' .\l"]
+  9 -> "9R4" [style=solid]
+ "9R4" [label="R4", fillcolor=3, shape=diamond, style=filled]
+  10 [label="State 10\n\l  6 start: empty_c 'c' .\l"]
+  10 -> "10R6" [style=solid]
+ "10R6" [label="R6", fillcolor=3, shape=diamond, style=filled]
+]])
+
+## ---------------- ##
+## Graph with  R/R. ##
+## ---------------- ##
+
+AT_TEST([Graph with R/R],
+[[%%
+exp: a | b;
+a: ;
+b: ;
+]],
+[[
+  0 [label="State 0\n\l  0 $accept: . exp $end\l  1 exp: . a\l  2    | . b\l  3 a: .  [$end]\l  4 b: .  [$end]\l"]
+  0 -> 1 [style=dashed label="exp"]
+  0 -> 2 [style=dashed label="a"]
+  0 -> 3 [style=dashed label="b"]
+  0 -> "0R3" [style=solid]
+ "0R3" [label="R3", fillcolor=3, shape=diamond, style=filled]
+  0 -> "0R4d" [label="[$end]", style=solid]
+ "0R4d" [label="R4", fillcolor=5, shape=diamond, style=filled]
+  1 [label="State 1\n\l  0 $accept: exp . $end\l"]
+  1 -> 4 [style=solid label="$end"]
+  2 [label="State 2\n\l  1 exp: a .\l"]
+  2 -> "2R1" [style=solid]
+ "2R1" [label="R1", fillcolor=3, shape=diamond, style=filled]
+  3 [label="State 3\n\l  2 exp: b .\l"]
+  3 -> "3R2" [style=solid]
+ "3R2" [label="R2", fillcolor=3, shape=diamond, style=filled]
+  4 [label="State 4\n\l  0 $accept: exp $end .\l"]
+  4 -> "4R0" [style=solid]
+ "4R0" [label="Acc", fillcolor=1, shape=diamond, style=filled]
+]])
+
+## ---------------------------------------- ##
+## Graph with reductions with multiple LAT. ##
+## ---------------------------------------- ##
+
+AT_TEST([Graph with reductions with multiple LAT],
+[[%%
+exp: a ';' | a ';' | a '.' | b '?' | b '!' | c '?' | c ';';
+a: ;
+b: ;
+c: ;
+]],
+[[
+  0 [label="State 0\n\l  0 $accept: . exp $end\l  1 exp: . a ';'\l  2    | . a ';'\l  3    | . a '.'\l  4    | . b '?'\l  5    | . b '!'\l  6    | . c '?'\l  7    | . c ';'\l  8 a: .  [';', '.']\l  9 b: .  ['?', '!']\l 10 c: .  [';', '?']\l"]
+  0 -> 1 [style=dashed label="exp"]
+  0 -> 2 [style=dashed label="a"]
+  0 -> 3 [style=dashed label="b"]
+  0 -> 4 [style=dashed label="c"]
+  0 -> "0R8" [style=solid]
+ "0R8" [label="R8", fillcolor=3, shape=diamond, style=filled]
+  0 -> "0R9" [label="['?', '!']", style=solid]
+ "0R9" [label="R9", fillcolor=3, shape=diamond, style=filled]
+  0 -> "0R10d" [label="[';', '?']", style=solid]
+ "0R10d" [label="R10", fillcolor=5, shape=diamond, style=filled]
+  1 [label="State 1\n\l  0 $accept: exp . $end\l"]
+  1 -> 5 [style=solid label="$end"]
+  2 [label="State 2\n\l  1 exp: a . ';'\l  2    | a . ';'\l  3    | a . '.'\l"]
+  2 -> 6 [style=solid label="';'"]
+  2 -> 7 [style=solid label="'.'"]
+  3 [label="State 3\n\l  4 exp: b . '?'\l  5    | b . '!'\l"]
+  3 -> 8 [style=solid label="'?'"]
+  3 -> 9 [style=solid label="'!'"]
+  4 [label="State 4\n\l  6 exp: c . '?'\l  7    | c . ';'\l"]
+  4 -> 10 [style=solid label="';'"]
+  4 -> 11 [style=solid label="'?'"]
+  5 [label="State 5\n\l  0 $accept: exp $end .\l"]
+  5 -> "5R0" [style=solid]
+ "5R0" [label="Acc", fillcolor=1, shape=diamond, style=filled]
+  6 [label="State 6\n\l  1 exp: a ';' .  [$end]\l  2    | a ';' .  [$end]\l"]
+  6 -> "6R1" [style=solid]
+ "6R1" [label="R1", fillcolor=3, shape=diamond, style=filled]
+  6 -> "6R2d" [label="[$end]", style=solid]
+ "6R2d" [label="R2", fillcolor=5, shape=diamond, style=filled]
+  7 [label="State 7\n\l  3 exp: a '.' .\l"]
+  7 -> "7R3" [style=solid]
+ "7R3" [label="R3", fillcolor=3, shape=diamond, style=filled]
+  8 [label="State 8\n\l  4 exp: b '?' .\l"]
+  8 -> "8R4" [style=solid]
+ "8R4" [label="R4", fillcolor=3, shape=diamond, style=filled]
+  9 [label="State 9\n\l  5 exp: b '!' .\l"]
+  9 -> "9R5" [style=solid]
+ "9R5" [label="R5", fillcolor=3, shape=diamond, style=filled]
+  10 [label="State 10\n\l  7 exp: c ';' .\l"]
+  10 -> "10R7" [style=solid]
+ "10R7" [label="R7", fillcolor=3, shape=diamond, style=filled]
+  11 [label="State 11\n\l  6 exp: c '?' .\l"]
+  11 -> "11R6" [style=solid]
+ "11R6" [label="R6", fillcolor=3, shape=diamond, style=filled]
+]])
+
+## ------------------------------------------------------ ##
+## Graph with a reduction rule both enabled and disabled. ##
+## ------------------------------------------------------ ##
+
+AT_TEST([Graph with a reduction rule both enabled and disabled],
+[[%%
+exp: ifexp | opexp | imm;
+ifexp: "if" exp "then" exp elseexp;
+elseexp: "else" exp | ;
+opexp: exp '+' exp;
+imm: '0';
+]],
+[[
+  0 [label="State 0\n\l  0 $accept: . exp $end\l  1 exp: . ifexp\l  2    | . opexp\l  3    | . imm\l  4 ifexp: . \"if\" exp \"then\" exp elseexp\l  7 opexp: . exp '+' exp\l  8 imm: . '0'\l"]
+  0 -> 1 [style=solid label="\"if\""]
+  0 -> 2 [style=solid label="'0'"]
+  0 -> 3 [style=dashed label="exp"]
+  0 -> 4 [style=dashed label="ifexp"]
+  0 -> 5 [style=dashed label="opexp"]
+  0 -> 6 [style=dashed label="imm"]
+  1 [label="State 1\n\l  1 exp: . ifexp\l  2    | . opexp\l  3    | . imm\l  4 ifexp: . \"if\" exp \"then\" exp elseexp\l  4      | \"if\" . exp \"then\" exp elseexp\l  7 opexp: . exp '+' exp\l  8 imm: . '0'\l"]
+  1 -> 1 [style=solid label="\"if\""]
+  1 -> 2 [style=solid label="'0'"]
+  1 -> 7 [style=dashed label="exp"]
+  1 -> 4 [style=dashed label="ifexp"]
+  1 -> 5 [style=dashed label="opexp"]
+  1 -> 6 [style=dashed label="imm"]
+  2 [label="State 2\n\l  8 imm: '0' .\l"]
+  2 -> "2R8" [style=solid]
+ "2R8" [label="R8", fillcolor=3, shape=diamond, style=filled]
+  3 [label="State 3\n\l  0 $accept: exp . $end\l  7 opexp: exp . '+' exp\l"]
+  3 -> 8 [style=solid label="$end"]
+  3 -> 9 [style=solid label="'+'"]
+  4 [label="State 4\n\l  1 exp: ifexp .\l"]
+  4 -> "4R1" [style=solid]
+ "4R1" [label="R1", fillcolor=3, shape=diamond, style=filled]
+  5 [label="State 5\n\l  2 exp: opexp .\l"]
+  5 -> "5R2" [style=solid]
+ "5R2" [label="R2", fillcolor=3, shape=diamond, style=filled]
+  6 [label="State 6\n\l  3 exp: imm .\l"]
+  6 -> "6R3" [style=solid]
+ "6R3" [label="R3", fillcolor=3, shape=diamond, style=filled]
+  7 [label="State 7\n\l  4 ifexp: \"if\" exp . \"then\" exp elseexp\l  7 opexp: exp . '+' exp\l"]
+  7 -> 10 [style=solid label="\"then\""]
+  7 -> 9 [style=solid label="'+'"]
+  8 [label="State 8\n\l  0 $accept: exp $end .\l"]
+  8 -> "8R0" [style=solid]
+ "8R0" [label="Acc", fillcolor=1, shape=diamond, style=filled]
+  9 [label="State 9\n\l  1 exp: . ifexp\l  2    | . opexp\l  3    | . imm\l  4 ifexp: . \"if\" exp \"then\" exp elseexp\l  7 opexp: . exp '+' exp\l  7      | exp '+' . exp\l  8 imm: . '0'\l"]
+  9 -> 1 [style=solid label="\"if\""]
+  9 -> 2 [style=solid label="'0'"]
+  9 -> 11 [style=dashed label="exp"]
+  9 -> 4 [style=dashed label="ifexp"]
+  9 -> 5 [style=dashed label="opexp"]
+  9 -> 6 [style=dashed label="imm"]
+  10 [label="State 10\n\l  1 exp: . ifexp\l  2    | . opexp\l  3    | . imm\l  4 ifexp: . \"if\" exp \"then\" exp elseexp\l  4      | \"if\" exp \"then\" . exp elseexp\l  7 opexp: . exp '+' exp\l  8 imm: . '0'\l"]
+  10 -> 1 [style=solid label="\"if\""]
+  10 -> 2 [style=solid label="'0'"]
+  10 -> 12 [style=dashed label="exp"]
+  10 -> 4 [style=dashed label="ifexp"]
+  10 -> 5 [style=dashed label="opexp"]
+  10 -> 6 [style=dashed label="imm"]
+  11 [label="State 11\n\l  7 opexp: exp . '+' exp\l  7      | exp '+' exp .  [$end, \"then\", \"else\", '+']\l"]
+  11 -> 9 [style=solid label="'+'"]
+  11 -> "11R7d" [label="['+']", style=solid]
+ "11R7d" [label="R7", fillcolor=5, shape=diamond, style=filled]
+  11 -> "11R7" [style=solid]
+ "11R7" [label="R7", fillcolor=3, shape=diamond, style=filled]
+  12 [label="State 12\n\l  4 ifexp: \"if\" exp \"then\" exp . elseexp\l  5 elseexp: . \"else\" exp\l  6        | .  [$end, \"then\", \"else\", '+']\l  7 opexp: exp . '+' exp\l"]
+  12 -> 13 [style=solid label="\"else\""]
+  12 -> 9 [style=solid label="'+'"]
+  12 -> 14 [style=dashed label="elseexp"]
+  12 -> "12R6d" [label="[\"else\", '+']", style=solid]
+ "12R6d" [label="R6", fillcolor=5, shape=diamond, style=filled]
+  12 -> "12R6" [style=solid]
+ "12R6" [label="R6", fillcolor=3, shape=diamond, style=filled]
+  13 [label="State 13\n\l  1 exp: . ifexp\l  2    | . opexp\l  3    | . imm\l  4 ifexp: . \"if\" exp \"then\" exp elseexp\l  5 elseexp: \"else\" . exp\l  7 opexp: . exp '+' exp\l  8 imm: . '0'\l"]
+  13 -> 1 [style=solid label="\"if\""]
+  13 -> 2 [style=solid label="'0'"]
+  13 -> 15 [style=dashed label="exp"]
+  13 -> 4 [style=dashed label="ifexp"]
+  13 -> 5 [style=dashed label="opexp"]
+  13 -> 6 [style=dashed label="imm"]
+  14 [label="State 14\n\l  4 ifexp: \"if\" exp \"then\" exp elseexp .\l"]
+  14 -> "14R4" [style=solid]
+ "14R4" [label="R4", fillcolor=3, shape=diamond, style=filled]
+  15 [label="State 15\n\l  5 elseexp: \"else\" exp .  [$end, \"then\", \"else\", '+']\l  7 opexp: exp . '+' exp\l"]
+  15 -> 9 [style=solid label="'+'"]
+  15 -> "15R5d" [label="['+']", style=solid]
+ "15R5d" [label="R5", fillcolor=5, shape=diamond, style=filled]
+  15 -> "15R5" [style=solid]
+ "15R5" [label="R5", fillcolor=3, shape=diamond, style=filled]
+]])
+
+m4_popdef([AT_TEST])
--- a/Show More
+++ b/Show More
@@ -1 +1 @@
 .5
 .6.5