style: no longer use backquotes

* tests/actions.at, tests/atlocal.in, tests/c++.at, tests/calc.at, * tests/conflicts.at, tests/existing.at, tests/glr-regression.at, * tests/input.at, tests/java.at, tests/local.at, tests/sets.at, * tests/synclines.at, doc/bison.texi, lib/libiberty.h, lib/timevar.h: Use single quotes.
2026-03-09 12:23:04 +00:00 · 2013-02-16 14:21:09 +01:00
parent 45eebca42d
commit 4c9b8f1318
15 changed files with 67 additions and 67 deletions
--- a/doc/bison.texi
+++ b/doc/bison.texi
@@ -2403,7 +2403,7 @@ Here are the C and Bison declarations for the multi-function calculator.
 %@{
  #include <stdio.h>  /* For printf, etc. */
  #include <math.h>   /* For pow, used in the grammar.  */
-  #include "calc.h"   /* Contains definition of `symrec'.  */
+  #include "calc.h"   /* Contains definition of 'symrec'.  */
  int yylex (void);
  void yyerror (char const *);
 %@}
@@ -2532,7 +2532,7 @@ struct symrec
@group
 typedef struct symrec symrec;

-/* The symbol table: a chain of `struct symrec'.  */
+/* The symbol table: a chain of 'struct symrec'.  */
 extern symrec *sym_table;

 symrec *putsym (char const *, int);
@@ -2567,7 +2567,7 @@ struct init const arith_fncts[] =
@end group

@group
-/* The symbol table: a chain of `struct symrec'.  */
+/* The symbol table: a chain of 'struct symrec'.  */
 symrec *sym_table;
@end group

@@ -2975,7 +2975,7 @@ Let's go ahead and add the new @code{YYLTYPE} definition and the
  #include <stdio.h>

  /* WARNING: The following code really belongs
-   * in a `%code requires'; see below.  */
+   * in a '%code requires'; see below.  */

  #include "ptypes.h"
  #define YYLTYPE YYLTYPE
@@ -6435,7 +6435,7 @@ yylex (void)
    return 0;
  @dots{}
  if (c == '+' || c == '-')
-    return c;      /* Assume token type for `+' is '+'.  */
+    return c;      /* Assume token type for '+' is '+'.  */
  @dots{}
  return INT;      /* Return the type of the token.  */
  @dots{}
@@ -9698,7 +9698,7 @@ Here is a list of options that can be used with Bison, alphabetized by
 short option.  It is followed by a cross key alphabetized by long
 option.

-@c Please, keep this ordered as in `bison --help'.
+@c Please, keep this ordered as in 'bison --help'.
@noindent
 Operations modes:
@table @option
@@ -12263,7 +12263,7 @@ operating system's name and version and your compiler's name and
 version.  If you have trouble compiling, you should also include a
 transcript of the build session, starting with the invocation of
 `configure'.  Depending on the nature of the bug, you may be asked to
-send additional files as well (such as `config.h' or `config.cache').
+send additional files as well (such as @file{config.h} or @file{config.cache}).

 Patches are most welcome, but not required.  That is, do not hesitate to
 send a bug report just because you cannot provide a fix.
--- a/lib/libiberty.h
+++ b/lib/libiberty.h
@@ -17,7 +17,7 @@


 /* Bison depends on libiberty's implementation of bitsets, which
-   requires a `libiberty.h' file.  This file provides the minimum
+   requires a 'libiberty.h' file.  This file provides the minimum
   services.  */

 #ifndef BISON_LIBIBERTY_H_
--- a/lib/timevar.h
+++ b/lib/timevar.h
@@ -36,7 +36,7 @@
       Timing variables may be pushed onto the stack; elapsed time is
       attributed to the topmost timing variable on the stack.  When
       another variable is pushed on, the previous topmost variable is
-       `paused' until the pushed variable is popped back off.
+       'paused' until the pushed variable is popped back off.

     - As a standalone timer, using timevar_start and timevar_stop.
       All time elapsed between the two calls is attributed to the
--- a/tests/actions.at
+++ b/tests/actions.at
@@ -525,7 +525,7 @@ AT_LALR1_CC_IF([typedef yy::location YYLTYPE;])[
 %%
 /*
   This grammar is made to exercise error recovery.
-   "Lines" starting with `(' support error recovery, with
+   "Lines" starting with '(' support error recovery, with
   ')' as synchronizing token.  Lines starting with 'x' can never
   be recovered from if in error.
 */
@@ -688,7 +688,7 @@ Successful parse.

 # Syntax errors caught by the parser
 # ----------------------------------
-# Exercise the discarding of stack top and input until `error'
+# Exercise the discarding of stack top and input until 'error'
 # can be reduced.
 #
 #     '(', 'x', 'x', 'x', 'x', 'x', ')',
@@ -1284,7 +1284,7 @@ AT_SETUP([Default %printer and %destructor are not for $accept])
 #   - The %printer and %destructor code generated for $accept would always be
 #     dead code because $accept is currently never shifted onto the stack.
 #   - $$ for $accept would always be of type YYSTYPE because it's not possible
-#     to declare `%type <field> $accept'.  (Also true for $undefined.)
+#     to declare '%type <field> $accept'.  (Also true for $undefined.)
 #   - Thus, the compiler might complain that the user code assumes the wrong
 #     type for $$ since the code might assume the type associated with a
 #     specific union field, which is especially reasonable in C++ since that
--- a/tests/atlocal.in
+++ b/tests/atlocal.in
@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

-# We need `config.h'.
+# We need 'config.h'.
 CPPFLAGS="-I$abs_top_builddir/lib @CPPFLAGS@"

 # Don't just check if $POSIXLY_CORRECT is set, as Bash, when launched
--- a/tests/c++.at
+++ b/tests/c++.at
@@ -420,8 +420,8 @@ AT_CLEANUP
 AT_SETUP([[Syntactically invalid namespace references]])
 AT_TEST([[:foo:bar]], [[-]])
 AT_TEST([[foo: :bar]], [[-]])
-# This one is interesting because `[3]' is encoded as `@<:@3@:>@', which
-# contains single occurrences of `:'.
+# This one is interesting because '[3]' is encoded as '@<:@3@:>@', which
+# contains single occurrences of ':'.
 AT_TEST([[foo[3]::bar::baz]], [[-]])
 AT_TEST([[foo::bar,baz]], [[-]])
 AT_TEST([[foo::bar::(baz /* Pacify Emacs ) */]], [[-]])
--- a/tests/calc.at
+++ b/tests/calc.at
@@ -27,11 +27,11 @@

 # _AT_DATA_CALC_Y($1, $2, $3, [BISON-DIRECTIVES])
 # -----------------------------------------------
-# Produce `calc.y' and, if %defines was specified, `calc-lex.c' or
-# `calc-lex.cc'.
+# Produce 'calc.y' and, if %defines was specified, 'calc-lex.c' or
+# 'calc-lex.cc'.
 #
 # 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
+# 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.
@@ -134,7 +134,7 @@ unget_char (]AT_YYLEX_PRE_FORMALS[ int c)
 {
  ]AT_USE_LEX_ARGS[;
 ]AT_LOCATION_IF([
-  /* Wrong when C == `\n'. */
+  /* Wrong when C == '\n'. */
  AT_LOC = last_yylloc;
 ])[
  ungetc (c, input);
@@ -366,8 +366,8 @@ m4_popdef([AT_CALC_LEX])

 # AT_DATA_CALC_Y([BISON-OPTIONS])
 # -------------------------------
-# Produce `calc.y' and, if %defines was specified, `calc-lex.c' or
-# `calc-lex.cc'.
+# Produce 'calc.y' and, if %defines was specified, 'calc-lex.c' or
+# 'calc-lex.cc'.
 m4_define([AT_DATA_CALC_Y],
 [_AT_DATA_CALC_Y($[1], $[2], $[3], [$1])
 ])
@@ -376,9 +376,9 @@ m4_define([AT_DATA_CALC_Y],

 # _AT_CHECK_CALC(BISON-OPTIONS, INPUT, [NUM-STDERR-LINES])
 # --------------------------------------------------------
-# Run `calc' on INPUT and expect no STDOUT nor STDERR.
+# Run 'calc' on INPUT and expect no STDOUT nor STDERR.
 #
-# If BISON-OPTIONS contains `%debug' but not `%glr-parser', then
+# If BISON-OPTIONS contains '%debug' but not '%glr-parser', then
 #
 # NUM-STDERR-LINES is the number of expected lines on stderr.
 # Currently this is ignored, though, since the output format is fluctuating.
@@ -397,7 +397,7 @@ AT_PARSER_CHECK([./calc input], 0, [], [stderr])
 #                      [NUM-STDERR-LINES],
 #                      [VERBOSE-AND-LOCATED-ERROR-MESSAGE])
 # ---------------------------------------------------------
-# Run `calc' on INPUT, and expect a `syntax 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,
 # otherwise as contents.
@@ -405,14 +405,14 @@ AT_PARSER_CHECK([./calc input], 0, [], [stderr])
 # NUM-STDERR-LINES is the number of expected lines on stderr.
 # Currently this is ignored, though, since the output format is fluctuating.
 #
-# If BISON-OPTIONS contains `%location', then make sure the ERROR-LOCATION
+# If BISON-OPTIONS contains '%location', then make sure the ERROR-LOCATION
 # is correctly output on stderr.
 #
-# If BISON-OPTIONS contains `%define parse.error verbose', then make sure the
-# IF-YYERROR-VERBOSE message is properly output after `syntax error, '
+# If BISON-OPTIONS contains '%define parse.error verbose', then make sure the
+# IF-YYERROR-VERBOSE message is properly output after 'syntax error, '
 # on STDERR.
 #
-# If BISON-OPTIONS contains `%debug' but not `%glr', then NUM-STDERR-LINES
+# If BISON-OPTIONS contains '%debug' but not '%glr', then NUM-STDERR-LINES
 # is the number of expected lines on stderr.
 m4_define([_AT_CHECK_CALC_ERROR],
 [m4_bmatch([$3], [^/],
@@ -449,7 +449,7 @@ AT_DATA([[expout]],
 AT_YYERROR_SEES_LOC_IF([],
 [[sed 's/^[-0-9.]*: //' expout >at-expout
 mv at-expout expout]])
-# 4. If error-verbose is not used, strip the`, unexpected....' part.
+# 4. If error-verbose is not used, strip the', unexpected....' part.
 m4_bmatch([$1], [%define parse.error verbose], [],
 [[sed 's/syntax error, .*$/syntax error/' expout >at-expout
 mv at-expout expout]])
@@ -479,7 +479,7 @@ m4_define([AT_CHECK_SPACES],

 # AT_CHECK_CALC([BISON-OPTIONS])
 # ------------------------------
-# Start a testing chunk which compiles `calc' grammar with
+# Start a testing chunk which compiles 'calc' grammar with
 # BISON-OPTIONS, and performs several tests over the parser.
 m4_define([AT_CHECK_CALC],
 [m4_ifval([$2], [m4_fatal([$0: expected a single argument])])
@@ -539,7 +539,7 @@ _AT_CHECK_CALC_ERROR([$1], [1], [/dev/null], [4],
 #   - (* * *): nothing to pop, a lot to discard
 #   - (1 + 2 * *): some to pop and discard
 #
-# - test the action associated to `error'
+# - test the action associated to 'error'
 #
 # - check the lookahead that triggers an error is not discarded
 #   when we enter error recovery.  Below, the lookahead causing the
@@ -588,7 +588,7 @@ AT_BANNER([[Simple LALR(1) Calculator.]])

 # AT_CHECK_CALC_LALR([BISON-OPTIONS])
 # -----------------------------------
-# Start a testing chunk which compiles `calc' grammar with
+# Start a testing chunk which compiles 'calc' grammar with
 # BISON-OPTIONS, and performs several tests over the parser.
 m4_define([AT_CHECK_CALC_LALR],
 [AT_CHECK_CALC($@)])
@@ -628,7 +628,7 @@ AT_BANNER([[Simple GLR Calculator.]])

 # AT_CHECK_CALC_GLR([BISON-OPTIONS])
 # ----------------------------------
-# Start a testing chunk which compiles `calc' grammar with
+# Start a testing chunk which compiles 'calc' grammar with
 # BISON-OPTIONS and %glr-parser, and performs several tests over the parser.
 m4_define([AT_CHECK_CALC_GLR],
 [AT_CHECK_CALC([%glr-parser] $@)])
@@ -670,7 +670,7 @@ AT_CHECK_CALC([%skeleton "lalr1.cc" %defines])

 # AT_CHECK_CALC_LALR1_CC([BISON-OPTIONS])
 # ---------------------------------------
-# Start a testing chunk which compiles `calc' grammar with
+# Start a testing chunk which compiles 'calc' grammar with
 # the C++ skeleton, and performs several tests over the parser.
 m4_define([AT_CHECK_CALC_LALR1_CC],
 [AT_CHECK_CALC([%language "C++"] $@)])
@@ -704,7 +704,7 @@ AT_CHECK_CALC([%skeleton "glr.cc"])

 # AT_CHECK_CALC_GLR_CC([BISON-OPTIONS])
 # -------------------------------------
-# Start a testing chunk which compiles `calc' grammar with
+# Start a testing chunk which compiles 'calc' grammar with
 # the GLR C++ skeleton, and performs several tests over the parser.
 m4_define([AT_CHECK_CALC_GLR_CC],
 [AT_CHECK_CALC([%language "C++" %glr-parser] $@)])
--- a/tests/conflicts.at
+++ b/tests/conflicts.at
@@ -936,13 +936,13 @@ AT_CLEANUP
 #    $end           reduce using rule 3 (num)
 #    $end           [reduce using rule 4 (id)]
 #
-# But when `reduce 3' is the default action, we'd produce:
+# But when 'reduce 3' is the default action, we'd produce:
 #
 #    $end           [reduce using rule 4 (id)]
 #    $default    reduce using rule 3 (num)
 #
 # In this precise case (a reduction is masked by the default
-# reduction), we make the `reduce 3' explicit:
+# reduction), we make the 'reduce 3' explicit:
 #
 #    $end           reduce using rule 3 (num)
 #    $end           [reduce using rule 4 (id)]
--- a/tests/existing.at
+++ b/tests/existing.at
@@ -403,26 +403,26 @@ dnl parses it as:
 dnl
 dnl   getline $!(4*0);
 dnl
-dnl That is, they shift `*' immediately and make it part of the getline
+dnl That is, they shift '*' immediately and make it part of the getline
 dnl argument.
 dnl
 dnl The grammar below using LALR(1) parses it as a syntax error.  So does
 dnl GNU AWK 3.0.6, 3.1.0, and 3.1.1.  They reduce the full getline expression
-dnl before shifting `*' even though `*' is not a valid lookahead.
+dnl before shifting '*' even though '*' is not a valid lookahead.
 dnl
 dnl GNU AWK 3.1.2, 3.1.3, 3.1.4, and 3.1.5 parse it as:
 dnl
 dnl   (getline $!4)*0;
 dnl
 dnl That is, like the other versions of GNU AWK, they reduce the full getline
-dnl expression before shifting `*'.  However, because of a different LHS on the
-dnl getline rule, `*' actually is a valid lookahead.  Solaris /usr/xpg4/bin/awk
+dnl expression before shifting '*'.  However, because of a different LHS on the
+dnl getline rule, '*' actually is a valid lookahead.  Solaris /usr/xpg4/bin/awk
 dnl and the Open Group awk specification seem to agree:
 dnl
 dnl   http://www.opengroup.org/pubs/online/7908799/xcu/awk.html
 dnl
 dnl /bin/nawk and /bin/awk on Solaris 10 report it as a syntax error, but they
-dnl don't like even `print $!4;'.
+dnl don't like even 'print $!4;'.
 [[LEX_GETLINE, '$', '!', YNUMBER, '*', YNUMBER, ';']],

 dnl BISON-STDERR
@@ -1649,7 +1649,7 @@ box "foo" above ljust == box ("foo" above ljust)

 %left LEFT RIGHT
 /* Give attributes that take an optional expression a higher
-precedence than left and right, so that eg `line chop left'
+precedence than left and right, so that eg 'line chop left'
 parses properly. */
 %left CHOP SOLID DASHED DOTTED UP DOWN FILL COLORED OUTLINED
 %left LABEL
@@ -1662,7 +1662,7 @@ parses properly. */
 /* these need to be lower than '-' */
 %left HEIGHT RADIUS WIDTH DIAMETER FROM TO AT THICKNESS

-/* these must have higher precedence than CHOP so that `label %prec CHOP'
+/* these must have higher precedence than CHOP so that 'label %prec CHOP'
 works */
 %left DOT_N DOT_E DOT_W DOT_S DOT_NE DOT_SE DOT_NW DOT_SW DOT_C
 %left DOT_START DOT_END TOP BOTTOM LEFT_CORNER RIGHT_CORNER
--- a/tests/glr-regression.at
+++ b/tests/glr-regression.at
@@ -1015,17 +1015,17 @@ main (void)
  int exit_status = yyparse ();
  if (parent_rhs_before_value)
    {
-      fprintf (stderr, "`parent_rhs_before' destructor not called.\n");
+      fprintf (stderr, "'parent_rhs_before' destructor not called.\n");
      exit_status = 1;
    }
  if (merged_value)
    {
-      fprintf (stderr, "`merged' destructor not called.\n");
+      fprintf (stderr, "'merged' destructor not called.\n");
      exit_status = 1;
    }
  if (parent_rhs_after_value)
    {
-      fprintf (stderr, "`PARENT_RHS_AFTER' destructor not called.\n");
+      fprintf (stderr, "'PARENT_RHS_AFTER' destructor not called.\n");
      exit_status = 1;
    }
  return exit_status;
@@ -1449,7 +1449,7 @@ main (void)
  int exit_status = yyparse () != 1;
  if (parent_rhs_before_value)
    {
-      fprintf (stderr, "`parent_rhs_before' destructor not called.\n");
+      fprintf (stderr, "'parent_rhs_before' destructor not called.\n");
      exit_status = 1;
    }
  return exit_status;
--- a/tests/input.at
+++ b/tests/input.at
@@ -1484,7 +1484,7 @@ AT_SETUP([[Unused %define api.pure]])

 # AT_CHECK_API_PURE(DECLS, VALUE)
 # -------------------------------
-# Make sure Bison reports that `%define api.pure VALUE' is unused when DECLS
+# Make sure Bison reports that '%define api.pure VALUE' is unused when DECLS
 # are specified.
 m4_define([AT_CHECK_API_PURE],
 [
--- a/tests/java.at
+++ b/tests/java.at
@@ -25,8 +25,8 @@ AT_BANNER([[Java Calculator.]])

 # _AT_DATA_JAVA_CALC_Y($1, $2, $3, [BISON-DIRECTIVES])
 # ----------------------------------------------------
-# Produce `calc.y'.  Don't call this macro directly, because it contains
-# some occurrences of `$1' etc. which will be interpreted by m4.  So
+# Produce 'calc.y'.  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_JAVA_CALC_Y does.
 m4_define([_AT_DATA_JAVA_CALC_Y],
@@ -206,7 +206,7 @@ AT_BISON_OPTION_POPDEFS

 # AT_DATA_CALC_Y([BISON-OPTIONS])
 # -------------------------------
-# Produce `calc.y'.
+# Produce 'calc.y'.
 m4_define([AT_DATA_JAVA_CALC_Y],
 [_AT_DATA_JAVA_CALC_Y($[1], $[2], $[3], [$1])
 ])
@@ -215,7 +215,7 @@ 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.
+# Run 'calc' on INPUT, and expect a 'syntax error' message.
 #
 # If INPUT starts with a slash, it is used as absolute input file name,
 # otherwise as contents.
@@ -240,7 +240,7 @@ AT_DATA([[expout]],
 AT_YYERROR_SEES_LOC_IF([],
 [[sed 's/^[-0-9.]*: //' expout >at-expout
 mv at-expout expout]])
-# 3. If error-verbose is not used, strip the`, unexpected....' part.
+# 3. If error-verbose is not used, strip the', unexpected....' part.
 m4_bmatch([$1], [%error-verbose], [],
 [[sed 's/syntax error, .*$/syntax error/' expout >at-expout
 mv at-expout expout]])
@@ -250,7 +250,7 @@ AT_CHECK([cat stderr], 0, [expout])

 # _AT_CHECK_JAVA_CALC([BISON-DIRECTIVES], [BISON-CODE])
 # -----------------------------------------------------
-# Start a testing chunk which compiles `calc' grammar with
+# Start a testing chunk which compiles 'calc' grammar with
 # BISON-DIRECTIVES, and performs several tests over the parser.
 m4_define([_AT_CHECK_JAVA_CALC],
 [# We use integers to avoid dependencies upon the precision of doubles.
@@ -310,7 +310,7 @@ _AT_CHECK_JAVA_CALC_ERROR([$1], [/dev/null],
 #   - (* * *): nothing to pop, a lot to discard
 #   - (1 + 2 * *): some to pop and discard
 #
-# - test the action associated to `error'
+# - test the action associated to 'error'
 #
 # - check the lookahead that triggers an error is not discarded
 #   when we enter error recovery.  Below, the lookahead causing the
@@ -342,7 +342,7 @@ AT_CLEANUP

 # AT_CHECK_JAVA_CALC([BISON-DIRECTIVES])
 # --------------------------------------
-# Start a testing chunk which compiles `calc' grammar with
+# Start a testing chunk which compiles 'calc' grammar with
 # BISON-DIRECTIVES, and performs several tests over the parser.
 # Run the test with and without %error-verbose.
 m4_define([AT_CHECK_JAVA_CALC],
--- a/tests/local.at
+++ b/tests/local.at
@@ -134,7 +134,7 @@ m4_define([AT_BISON_OPTION_PUSHDEFS],
 # _AT_BISON_OPTION_PUSHDEFS($1, $2, [BISON-OPTIONS])
 # --------------------------------------------------
 # This macro works around the impossibility to define macros
-# inside macros, because issuing `[$1]' is not possible in M4 :(.
+# inside macros, because issuing '[$1]' is not possible in M4 :(.
 # This sucks hard, GNU M4 should really provide M5-like $$1.
 m4_define([_AT_BISON_OPTION_PUSHDEFS],
 [m4_if([$1$2], $[1]$[2], [],
@@ -599,7 +599,7 @@ m4_define([AT_MAIN_DEFINE(java)],
 # High-level routine that may call bison several times, under different
 # conditions.
 #
-# Check Bison by invoking `bison BISON_ARGS'.  BISON_ARGS should not contain
+# 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
 # are the usual remaining arguments to AT_CHECK: STATUS, STDOUT, etc.
@@ -876,7 +876,7 @@ AT_PARSER_CHECK([./c-and-cxx])

 # AT_PARSER_CHECK(COMMAND, EXIT-STATUS, EXPOUT, EXPERR, [PRE])
 # ------------------------------------------------------------
-# So that we can run `./testsuite PREPARSER='valgrind -q' for instance.
+# So that we can run './testsuite PREPARSER='valgrind -q' for instance.
 #
 # Get rid of spurious messages when compiled with --coverage:
 # +profiling:/[...]/lib/fprintf.gcda:Merge mismatch for summaries
@@ -918,16 +918,16 @@ m4_define([AT_JAVA_PARSER_CHECK],
 # that Bison exits with value 0, has no stdout, and has stderr
 # BISON-STDERR.
 #
-# If TEST-SPEC contains the attribute `last-state', check that the value
+# If TEST-SPEC contains the attribute 'last-state', check that the value
 # of TABLES-OR-LAST-STATE is the index of the last state generated for
 # the grammar; in other words, check the number of states (minus one).
-# Otherwise, check that everything in the `.output' file starting with
+# Otherwise, check that everything in the '.output' file starting with
 # the definition of state 0 is the same as the entire value of
 # TABLES-OR-LAST-STATE.
 #
 # Expand the M4 in OTHER-CHECKS to perform additional checks of the
-# `.output' file, which is named `input.output', and/or grammar file,
-# which is named `input.y'.
+# '.output' file, which is named 'input.output', and/or grammar file,
+# which is named 'input.y'.
 #
 # Finally, compile the generated parser and then run it using
 # AT_PARSER_CHECK with PARSER-EXIT-VALUE, PARSER-STDOUT, and
--- a/tests/sets.at
+++ b/tests/sets.at
@@ -113,7 +113,7 @@ AT_CLEANUP
 ## Broken Closure.  ##
 ## ---------------- ##

-# TC was once broken during a massive `simplification' of the code.
+# TC was once broken during a massive 'simplification' of the code.
 # It resulted in bison dumping core on the following grammar (the
 # computation of FIRSTS uses TC).  It managed to produce a pretty
 # exotic closure:
@@ -263,7 +263,7 @@ AT_CLEANUP
 # In some weird cases Bison could compute an incorrect final state
 # number.  This happens only if the $end token is used in the user
 # grammar, which is a very suspicious accidental feature introduced as
-# a side effect of allowing the user to name $end using `%token END 0
+# a side effect of allowing the user to name $end using '%token END 0
 # "end of file"'.

 AT_SETUP([Accept])
--- a/tests/synclines.at
+++ b/tests/synclines.at
@@ -23,7 +23,7 @@ AT_BANNER([[User Actions.]])
 # --------------------------
 # Compile FILE expecting an error, and save in the file stdout the
 # normalized output.  Ignore the exit status, since some compilers
-# (e.g. c89 on IRIX 6.5) trigger warnings on `#error', instead of
+# (e.g. c89 on IRIX 6.5) trigger warnings on '#error', instead of
 # errors.
 m4_define([AT_SYNCLINES_COMPILE],
 [AT_CHECK([$CC $CFLAGS $CPPFLAGS -c $1], [ignore], [], [stderr])