* data/c.m4 (b4_yy_symbol_print_generate):

(b4_yy_symbol_print_generate): Use 'YYSTYPE const' rather than
'const YYSTYPE', and similarly for YYLTYPE.  This fixes one
of the bugs reported today by Derek M Jones in
<http://lists.gnu.org/archive/html/bug-bison/2006-05/msg00027.html>.
* doc/bison.texinfo (Value Type): Document that YYSTYPE must be
defined to be a type name without parens or brackets.
(Location Type): Similarly for YYLTYPE.
* tests/regression.at (Trivial grammars): Put in a test for this
bug that will be caught by 'make maintainer-check' (though not,
alas, by 'make check' unless your compiler is picky).

tests/regression.at

@@ -31,6 +31,7 @@ AT_DATA_GRAMMAR([input.y],
 [[%{
 void yyerror (char const *);
 int yylex (void);
+#define YYSTYPE int *
 %}
 
 %error-verbose
@@ -42,6 +43,7 @@ program: 'x';
 
 AT_CHECK([bison -o input.c input.y])
 AT_COMPILE([input.o], [-c input.c])
+AT_COMPILE([input.o], [-DYYDEBUG -c input.c])
 
 AT_CLEANUP