warnings: useless semantic types

[bison.git] / tests / actions.at

diff --git a/tests/actions.at b/tests/actions.at
index 21244c6f31e0cbd8614be5601c323c73343af465..4af561536aa5cd26c9e0c4d827b620f1c0f2e1f2 100644 (file)
--- a/tests/actions.at
+++ b/tests/actions.at
@@ -1,20 +1,19 @@
 # Executing Actions.                               -*- Autotest -*-
 # Executing Actions.                               -*- Autotest -*-

-# Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 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 2, or (at your option)
-# any later version.
+# Copyright (C) 2001-2012 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.
 # 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
 # You should have received a copy of the GNU General Public License

-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-# 02110-1301, USA.
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.

 
 AT_BANNER([[User Actions.]])
 
 
 AT_BANNER([[User Actions.]])
 


@@ -29,14 +28,13 @@ AT_SETUP([Mid-rule actions])
 # instead of being attached to the empty rule dedicated to this
 # action.
 
 # instead of being attached to the empty rule dedicated to this
 # action.
 

+AT_BISON_OPTION_PUSHDEFS

 AT_DATA_GRAMMAR([[input.y]],
 AT_DATA_GRAMMAR([[input.y]],

-[[%error-verbose
+[[%define parse.error verbose

 %debug
 %{
 %debug
 %{

-# include <stdio.h>
-# include <stdlib.h>
-  static void yyerror (const char *msg);
-  static int yylex (void);
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[

 %}
 %%
 exp:     { putchar ('0'); }
 %}
 %%
 exp:     { putchar ('0'); }


@@ -52,30 +50,17 @@ exp:     { putchar ('0'); }
          { putchar ('\n'); }
    ;
 %%
          { putchar ('\n'); }
    ;
 %%

-static int
-yylex (void)
-{
-  static char const input[] = "123456789";
-  static size_t toknum;
-  if (! (toknum < sizeof input))
-    abort ();
-  return input[toknum++];
-}
-
-static void
-yyerror (const char *msg)
-{
-  fprintf (stderr, "%s\n", msg);
-}
-
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(123456789)[

 int
 main (void)
 {
   return yyparse ();
 }
 ]])
 int
 main (void)
 {
   return yyparse ();
 }
 ]])

+AT_BISON_OPTION_POPDEFS

 
 

-AT_CHECK([bison -d -v -o input.c input.y])
+AT_BISON_CHECK([-d -v -o input.c input.y])

 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], 0,
 [[0123456789
 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], 0,
 [[0123456789


@@ -93,14 +78,13 @@ AT_CLEANUP
 
 AT_SETUP([Exotic Dollars])
 
 
 AT_SETUP([Exotic Dollars])
 

+AT_BISON_OPTION_PUSHDEFS

 AT_DATA_GRAMMAR([[input.y]],
 AT_DATA_GRAMMAR([[input.y]],

-[[%error-verbose
+[[%define parse.error verbose

 %debug
 %{
 %debug
 %{

-# include <stdio.h>
-# include <stdlib.h>
-  static void yyerror (const char *msg);
-  static int yylex (void);
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[

 # define USE(Var)
 %}
 
 # define USE(Var)
 %}
 


@@ -131,21 +115,43 @@ sum_of_the_five_previous_values:
 ;
 
 %%
 ;
 
 %%

-static int
-yylex (void)
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE([])[
+int
+main (void)

 {
 {

-  static int called;
-  if (called++)
-    abort ();
-  return EOF;
+  return yyparse ();

 }
 }

+]])

 
 

-static void
-yyerror (const char *msg)
-{
-  fprintf (stderr, "%s\n", msg);
-}
+AT_BISON_CHECK([-d -v -o input.c input.y], 0)
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], 0,
+[[15
+]])

 
 

+# Make sure that fields after $n or $-n are parsed correctly.  At one
+# point while implementing dashes in symbol names, we were dropping
+# fields after $-n.
+AT_DATA_GRAMMAR([[input.y]],
+[[
+%{
+# include <stdio.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+  typedef struct { int val; } stype;
+# define YYSTYPE stype
+%}
+
+%%
+start: one two { $$.val = $1.val + $2.val; } sum ;
+one: { $$.val = 1; } ;
+two: { $$.val = 2; } ;
+sum: { printf ("%d\n", $0.val + $-1.val + $-2.val); } ;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE()[

 int
 main (void)
 {
 int
 main (void)
 {


@@ -153,12 +159,13 @@ main (void)
 }
 ]])
 
 }
 ]])
 

-AT_CHECK([bison -d -v -o input.c input.y], 0)
-AT_COMPILE([input])
-AT_PARSER_CHECK([./input], 0,
-[[15
+AT_BISON_CHECK([[-o input.c input.y]])
+AT_COMPILE([[input]])
+AT_PARSER_CHECK([[./input]], [[0]],
+[[6

 ]])
 
 ]])
 

+AT_BISON_OPTION_POPDEFS

 AT_CLEANUP
 
 
 AT_CLEANUP
 
 


@@ -178,7 +185,7 @@ m4_if([$1$2$3], $[1]$[2]$[3], [],
 # helping macros.  So don't put any directly in the Bison file.
 AT_BISON_OPTION_PUSHDEFS([$5])
 AT_DATA_GRAMMAR([[input.y]],
 # helping macros.  So don't put any directly in the Bison file.
 AT_BISON_OPTION_PUSHDEFS([$5])
 AT_DATA_GRAMMAR([[input.y]],

-[[%start-header {
+[[%code requires {

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>


@@ -196,11 +203,11 @@ m4_ifval([$6], [%union
 {
   int ival;
 }])
 {
   int ival;
 }])

-AT_LALR1_CC_IF([%define "global_tokens_and_yystype"])
-m4_ifval([$6], [[%end-header {]], [[%after-header {]])
-AT_LALR1_CC_IF([typedef yy::location YYLTYPE;])
-[static int yylex (]AT_LEX_FORMALS[);
-]AT_LALR1_CC_IF([], [static void yyerror (const char *msg);])
+AT_LALR1_CC_IF([%define global_tokens_and_yystype])
+m4_ifval([$6], [[%code provides {]], [[%code {]])
+AT_LALR1_CC_IF([typedef yy::location YYLTYPE;])[
+]AT_YYLEX_DECLARE[
+]AT_LALR1_CC_IF([], [AT_YYERROR_DECLARE])

 [}
 
 ]m4_ifval([$6], [%type <ival> '(' 'x' 'y' ')' ';' thing line input END])[
 [}
 
 ]m4_ifval([$6], [%type <ival> '(' 'x' 'y' ')' ';' thing line input END])[


@@ -253,11 +260,11 @@ input:
       printf ("input (%d@%d-%d): /* Nothing */\n", $$, RANGE (@$));
     }
 | line input /* Right recursive to load the stack so that popping at
       printf ("input (%d@%d-%d): /* Nothing */\n", $$, RANGE (@$));
     }
 | line input /* Right recursive to load the stack so that popping at

-               END can be exercised.  */
+                END can be exercised.  */

     {
       $$ = 2;
       printf ("input (%d@%d-%d): line (%d@%d-%d) input (%d@%d-%d)\n",
     {
       $$ = 2;
       printf ("input (%d@%d-%d): line (%d@%d-%d) input (%d@%d-%d)\n",

-             $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2));
+              $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2));

     }
 ;
 
     }
 ;
 


@@ -300,10 +307,10 @@ thing:
 ;
 %%
 /* Alias to ARGV[1]. */
 ;
 %%
 /* Alias to ARGV[1]. */

-const char *source = 0;
+const char *source = YY_NULL;

 
 

-static int
-yylex (]AT_LEX_FORMALS[)
+static
+]AT_YYLEX_PROTOTYPE[

 {
   static unsigned int counter = 0;
 
 {
   static unsigned int counter = 0;
 


@@ -368,11 +375,7 @@ main (int argc, const char *argv[])
 }
 ]])
 
 }
 ]])
 

-AT_LALR1_CC_IF(
-  [AT_CHECK([bison -o input.cc input.y])
-   AT_COMPILE_CXX([input])],
-  [AT_CHECK([bison -o input.c input.y])
-   AT_COMPILE([input])])
+AT_FULL_COMPILE([input])

 
 
 # Check the location of "empty"
 
 
 # Check the location of "empty"


@@ -552,7 +555,8 @@ Parsing FAILED (status 2).
 ]])
 ])
 
 ]])
 ])
 

-])
+AT_BISON_OPTION_POPDEFS
+])# _AT_CHECK_PRINTER_AND_DESTRUCTOR

 
 
 # AT_CHECK_PRINTER_AND_DESTRUCTOR([BISON-OPTIONS], [UNION-FLAG], [SKIP_FLAG])
 
 
 # AT_CHECK_PRINTER_AND_DESTRUCTOR([BISON-OPTIONS], [UNION-FLAG], [SKIP_FLAG])


@@ -562,7 +566,7 @@ m4_define([AT_CHECK_PRINTER_AND_DESTRUCTOR],
 
 $3
 _AT_CHECK_PRINTER_AND_DESTRUCTOR($[1], $[2], $[3], $[4],
 
 $3
 _AT_CHECK_PRINTER_AND_DESTRUCTOR($[1], $[2], $[3], $[4],

-[%error-verbose
+[%define parse.error verbose

 %debug
 %verbose
 %locations
 %debug
 %verbose
 %locations


@@ -583,17 +587,17 @@ AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser], [with union])
 
 
 
 
 
 

-## --------------------------------- ##
-## Default %printer and %destructor. ##
-## --------------------------------- ##
+## ----------------------------------------- ##
+## Default tagless %printer and %destructor. ##
+## ----------------------------------------- ##

 
 # Check that the right %printer and %destructor are called, that they're not
 # called for $end, and that $$ and @$ work correctly.
 
 
 # Check that the right %printer and %destructor are called, that they're not
 # called for $end, and that $$ and @$ work correctly.
 

-AT_SETUP([Default %printer and %destructor])
-
+AT_SETUP([Default tagless %printer and %destructor])
+AT_BISON_OPTION_PUSHDEFS([%locations])

 AT_DATA_GRAMMAR([[input.y]],
 AT_DATA_GRAMMAR([[input.y]],

-[[%error-verbose
+[[%define parse.error verbose

 %debug
 %locations
 %initial-action {
 %debug
 %locations
 %initial-action {


@@ -604,17 +608,21 @@ AT_DATA_GRAMMAR([[input.y]],
 %{
 # include <stdio.h>
 # include <stdlib.h>
 %{
 # include <stdio.h>
 # include <stdlib.h>

-  static void yyerror (const char *msg);
-  static int yylex (void);
+]AT_YYLEX_DECLARE[
+]AT_YYERROR_DECLARE[

 # define USE(SYM)
 %}
 
 %printer {
 # define USE(SYM)
 %}
 
 %printer {

-  fprintf (yyoutput, "Default printer for '%c' @ %d", $$, @$.first_column);
-} %symbol-default
+  fprintf (yyoutput, "<*> printer should not be called.\n");
+} <*>
+
+%printer {
+  fprintf (yyoutput, "<> printer for '%c' @ %d", $$, @$.first_column);
+} <>

 %destructor {
 %destructor {

-  fprintf (stdout, "Default destructor for '%c' @ %d.\n", $$, @$.first_column);
-} %symbol-default
+  fprintf (stdout, "<> destructor for '%c' @ %d.\n", $$, @$.first_column);
+} <>

 
 %printer {
   fprintf (yyoutput, "'b'/'c' printer for '%c' @ %d", $$, @$.first_column);
 
 %printer {
   fprintf (yyoutput, "'b'/'c' printer for '%c' @ %d", $$, @$.first_column);


@@ -623,30 +631,17 @@ AT_DATA_GRAMMAR([[input.y]],
   fprintf (stdout, "'b'/'c' destructor for '%c' @ %d.\n", $$, @$.first_column);
 } 'b' 'c'
 
   fprintf (stdout, "'b'/'c' destructor for '%c' @ %d.\n", $$, @$.first_column);
 } 'b' 'c'
 

+%destructor {
+  fprintf (yyoutput, "<*> destructor should not be called.\n");
+} <*>
+

 %%
 
 start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;
 
 %%
 %%
 
 start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;
 
 %%

-
-static int
-yylex (void)
-{
-  static char const input[] = "abcd";
-  static size_t toknum;
-  if (! (toknum < sizeof input))
-    abort ();
-  yylval = input[toknum++];
-  yylloc.first_line = yylloc.last_line = 1;
-  yylloc.first_column = yylloc.last_column = toknum;
-  return yylval;
-}
-
-static void
-yyerror (const char *msg)
-{
-  fprintf (stderr, "%s\n", msg);
-}
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE([abcd], [[yylval = res]])[

 
 int
 main (void)
 
 int
 main (void)


@@ -656,18 +651,18 @@ main (void)
 }
 ]])
 
 }
 ]])
 

-AT_CHECK([bison -o input.c input.y])
+AT_BISON_CHECK([-o input.c input.y])

 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], 1,
 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], 1,

-[[Default destructor for 'd' @ 4.
+[[<> destructor for 'd' @ 4.

 'b'/'c' destructor for 'c' @ 3.
 'b'/'c' destructor for 'b' @ 2.
 'b'/'c' destructor for 'c' @ 3.
 'b'/'c' destructor for 'b' @ 2.

-Default destructor for 'a' @ 1.
+<> destructor for 'a' @ 1.

 ]],
 [[Starting parse
 Entering state 0
 ]],
 [[Starting parse
 Entering state 0

-Reading a token: Next token is token 'a' (1.1-1.1: Default printer for 'a' @ 1)
-Shifting token 'a' (1.1-1.1: Default printer for 'a' @ 1)
+Reading a token: Next token is token 'a' (1.1-1.1: <> printer for 'a' @ 1)
+Shifting token 'a' (1.1-1.1: <> printer for 'a' @ 1)

 Entering state 1
 Reading a token: Next token is token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 Shifting token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 Entering state 1
 Reading a token: Next token is token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 Shifting token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)


@@ -675,55 +670,60 @@ Entering state 3
 Reading a token: Next token is token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Shifting token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Entering state 5
 Reading a token: Next token is token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Shifting token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Entering state 5

-Reading a token: Next token is token 'd' (1.4-1.4: Default printer for 'd' @ 4)
-Shifting token 'd' (1.4-1.4: Default printer for 'd' @ 4)
+Reading a token: Next token is token 'd' (1.4-1.4: <> printer for 'd' @ 4)
+Shifting token 'd' (1.4-1.4: <> printer for 'd' @ 4)

 Entering state 6
 Reading a token: Now at end of input.
 Entering state 6
 Reading a token: Now at end of input.

-syntax error, unexpected $end, expecting 'e'
-Error: popping token 'd' (1.4-1.4: Default printer for 'd' @ 4)
+1.5-4: syntax error, unexpected $end, expecting 'e'
+Error: popping token 'd' (1.4-1.4: <> printer for 'd' @ 4)

 Stack now 0 1 3 5
 Error: popping token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Stack now 0 1 3
 Error: popping token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 Stack now 0 1
 Stack now 0 1 3 5
 Error: popping token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Stack now 0 1 3
 Error: popping token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 Stack now 0 1

-Error: popping token 'a' (1.1-1.1: Default printer for 'a' @ 1)
+Error: popping token 'a' (1.1-1.1: <> printer for 'a' @ 1)

 Stack now 0
 Cleanup: discarding lookahead token $end (1.5-1.5: )
 Stack now 0
 ]])
 
 Stack now 0
 Cleanup: discarding lookahead token $end (1.5-1.5: )
 Stack now 0
 ]])
 

+AT_BISON_OPTION_POPDEFS

 AT_CLEANUP
 
 
 
 AT_CLEANUP
 
 
 

-## ----------------------------------- ##
-## Per-type %printer and %destructor.  ##
-## ----------------------------------- ##
-
-AT_SETUP([Per-type %printer and %destructor])
+## ------------------------------------------------------ ##
+## Default tagged and per-type %printer and %destructor.  ##
+## ------------------------------------------------------ ##

 
 

+AT_SETUP([Default tagged and per-type %printer and %destructor])
+AT_BISON_OPTION_PUSHDEFS

 AT_DATA_GRAMMAR([[input.y]],
 AT_DATA_GRAMMAR([[input.y]],

-[[%error-verbose
+[[%define parse.error verbose

 %debug
 
 %{
 # include <stdio.h>
 # include <stdlib.h>
 %debug
 
 %{
 # include <stdio.h>
 # include <stdlib.h>

-  static void yyerror (const char *msg);
-  static int yylex (void);
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[

 # define USE(SYM)
 %}
 
 # define USE(SYM)
 %}
 

+%printer {
+  fprintf (yyoutput, "<> printer should not be called.\n");
+} <>
+

 %union { int field0; int field1; int field2; }
 %type <field0> start 'a' 'g'
 %type <field1> 'e'
 %type <field2> 'f'
 %printer {
 %union { int field0; int field1; int field2; }
 %type <field0> start 'a' 'g'
 %type <field1> 'e'
 %type <field2> 'f'
 %printer {

-  fprintf (yyoutput, "%%symbol-default/<field2>/e printer");
-} %symbol-default 'e' <field2>
+  fprintf (yyoutput, "<*>/<field2>/e printer");
+} <*> 'e' <field2>

 %destructor {
 %destructor {

-  fprintf (stdout, "%%symbol-default/<field2>/e destructor.\n");
-} %symbol-default 'e' <field2>
+  fprintf (stdout, "<*>/<field2>/e destructor.\n");
+} <*> 'e' <field2>

 
 %type <field1> 'b'
 %printer { fprintf (yyoutput, "<field1> printer"); } <field1>
 
 %type <field1> 'b'
 %printer { fprintf (yyoutput, "<field1> printer"); } <field1>


@@ -737,6 +737,10 @@ AT_DATA_GRAMMAR([[input.y]],
 %printer { fprintf (yyoutput, "'d' printer"); } 'd'
 %destructor { fprintf (stdout, "'d' destructor.\n"); } 'd'
 
 %printer { fprintf (yyoutput, "'d' printer"); } 'd'
 %destructor { fprintf (stdout, "'d' destructor.\n"); } 'd'
 

+%destructor {
+  fprintf (yyoutput, "<> destructor should not be called.\n");
+} <>
+

 %%
 
 start:
 %%
 
 start:


@@ -748,22 +752,8 @@ start:
   ;
 
 %%
   ;
 
 %%

-
-static int
-yylex (void)
-{
-  static char const input[] = "abcdef";
-  static size_t toknum;
-  if (! (toknum < sizeof input))
-    abort ();
-  return input[toknum++];
-}
-
-static void
-yyerror (const char *msg)
-{
-  fprintf (stderr, "%s\n", msg);
-}
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE([abcdef])[

 
 int
 main (void)
 
 int
 main (void)


@@ -773,20 +763,20 @@ main (void)
 }
 ]])
 
 }
 ]])
 

-AT_CHECK([bison -o input.c input.y])
+AT_BISON_CHECK([-o input.c input.y])

 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], 1,
 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], 1,

-[[%symbol-default/<field2>/e destructor.
-%symbol-default/<field2>/e destructor.
+[[<*>/<field2>/e destructor.
+<*>/<field2>/e destructor.

 'd' destructor.
 'c' destructor.
 <field1> destructor.
 'd' destructor.
 'c' destructor.
 <field1> destructor.

-%symbol-default/<field2>/e destructor.
+<*>/<field2>/e destructor.

 ]],
 [[Starting parse
 Entering state 0
 ]],
 [[Starting parse
 Entering state 0

-Reading a token: Next token is token 'a' (%symbol-default/<field2>/e printer)
-Shifting token 'a' (%symbol-default/<field2>/e printer)
+Reading a token: Next token is token 'a' (<*>/<field2>/e printer)
+Shifting token 'a' (<*>/<field2>/e printer)

 Entering state 1
 Reading a token: Next token is token 'b' (<field1> printer)
 Shifting token 'b' (<field1> printer)
 Entering state 1
 Reading a token: Next token is token 'b' (<field1> printer)
 Shifting token 'b' (<field1> printer)


@@ -797,17 +787,17 @@ Entering state 5
 Reading a token: Next token is token 'd' ('d' printer)
 Shifting token 'd' ('d' printer)
 Entering state 6
 Reading a token: Next token is token 'd' ('d' printer)
 Shifting token 'd' ('d' printer)
 Entering state 6

-Reading a token: Next token is token 'e' (%symbol-default/<field2>/e printer)
-Shifting token 'e' (%symbol-default/<field2>/e printer)
+Reading a token: Next token is token 'e' (<*>/<field2>/e printer)
+Shifting token 'e' (<*>/<field2>/e printer)

 Entering state 7
 Entering state 7

-Reading a token: Next token is token 'f' (%symbol-default/<field2>/e printer)
-Shifting token 'f' (%symbol-default/<field2>/e printer)
+Reading a token: Next token is token 'f' (<*>/<field2>/e printer)
+Shifting token 'f' (<*>/<field2>/e printer)

 Entering state 8
 Reading a token: Now at end of input.
 syntax error, unexpected $end, expecting 'g'
 Entering state 8
 Reading a token: Now at end of input.
 syntax error, unexpected $end, expecting 'g'

-Error: popping token 'f' (%symbol-default/<field2>/e printer)
+Error: popping token 'f' (<*>/<field2>/e printer)

 Stack now 0 1 3 5 6 7
 Stack now 0 1 3 5 6 7

-Error: popping token 'e' (%symbol-default/<field2>/e printer)
+Error: popping token 'e' (<*>/<field2>/e printer)

 Stack now 0 1 3 5 6
 Error: popping token 'd' ('d' printer)
 Stack now 0 1 3 5
 Stack now 0 1 3 5 6
 Error: popping token 'd' ('d' printer)
 Stack now 0 1 3 5


@@ -815,24 +805,33 @@ Error: popping token 'c' ('c' printer)
 Stack now 0 1 3
 Error: popping token 'b' (<field1> printer)
 Stack now 0 1
 Stack now 0 1 3
 Error: popping token 'b' (<field1> printer)
 Stack now 0 1

-Error: popping token 'a' (%symbol-default/<field2>/e printer)
+Error: popping token 'a' (<*>/<field2>/e printer)

 Stack now 0
 Cleanup: discarding lookahead token $end ()
 Stack now 0
 ]])
 
 Stack now 0
 Cleanup: discarding lookahead token $end ()
 Stack now 0
 ]])
 

+AT_BISON_OPTION_POPDEFS

 AT_CLEANUP
 
 
 
 ## ------------------------------------------------------------- ##
 AT_CLEANUP
 
 
 
 ## ------------------------------------------------------------- ##

-## Default %printer and %destructor for user-defined end token. ##
+## Default %printer and %destructor for user-defined end token.  ##

 ## ------------------------------------------------------------- ##
 
 AT_SETUP([Default %printer and %destructor for user-defined end token])
 
 ## ------------------------------------------------------------- ##
 
 AT_SETUP([Default %printer and %destructor for user-defined end token])
 

-AT_DATA_GRAMMAR([[input.y]],
-[[%error-verbose
+# _AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(TYPED)
+# -------------------------------------------------------------
+m4_define([_AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN],
+[m4_if($1, 0,
+  [m4_pushdef([kind], []) m4_pushdef([not_kind], [*])],
+  [m4_pushdef([kind], [*]) m4_pushdef([not_kind], [])])
+
+AT_BISON_OPTION_PUSHDEFS([%locations])
+AT_DATA_GRAMMAR([[input]]$1[[.y]],
+[[%define parse.error verbose

 %debug
 %locations
 %initial-action {
 %debug
 %locations
 %initial-action {


@@ -843,18 +842,31 @@ AT_DATA_GRAMMAR([[input.y]],
 %{
 # include <stdio.h>
 # include <stdlib.h>
 %{
 # include <stdio.h>
 # include <stdlib.h>

-  static void yyerror (const char *msg);
-  static int yylex (void);
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[

 # define USE(SYM)
 %}
 
 # define USE(SYM)
 %}
 

+%destructor {
+  fprintf (yyoutput, "<]]not_kind[[> destructor should not be called.\n");
+} <]]not_kind[[>
+

 %token END 0
 %printer {
 %token END 0
 %printer {

-  fprintf (yyoutput, "Default printer for '%c' @ %d", $$, @$.first_column);
-} %symbol-default
+  fprintf (yyoutput, "<]]kind[[> for '%c' @ %d", $$, @$.first_column);
+} <]]kind[[>

 %destructor {
 %destructor {

-  fprintf (stdout, "Default destructor for '%c' @ %d.\n", $$, @$.first_column);
-} %symbol-default
+  fprintf (stdout, "<]]kind[[> for '%c' @ %d.\n", $$, @$.first_column);
+} <]]kind[[>
+
+%printer {
+  fprintf (yyoutput, "<]]not_kind[[> printer should not be called.\n");
+} <]]not_kind[[>
+
+]]m4_if($1, 0, [[[
+]]],
+[[[%union { char tag; }
+%type <tag> start END]]])[[

 
 %%
 
 
 %%
 


@@ -868,17 +880,12 @@ yylex (void)
   static int called;
   if (called++)
     abort ();
   static int called;
   if (called++)
     abort ();

-  yylval = 'E';
+  yylval]]m4_if($1, 0,, [[[.tag]]])[[ = 'E';

   yylloc.first_line = yylloc.last_line = 1;
   yylloc.first_column = yylloc.last_column = 1;
   return 0;
 }
   yylloc.first_line = yylloc.last_line = 1;
   yylloc.first_column = yylloc.last_column = 1;
   return 0;
 }

-
-static void
-yyerror (const char *msg)
-{
-  fprintf (stderr, "%s\n", msg);
-}
+]AT_YYERROR_DEFINE[

 
 int
 main (void)
 
 int
 main (void)


@@ -887,27 +894,35 @@ main (void)
   return yyparse ();
 }
 ]])
   return yyparse ();
 }
 ]])

+AT_BISON_OPTION_POPDEFS

 
 

-AT_CHECK([bison -o input.c input.y])
-AT_COMPILE([input])
-AT_PARSER_CHECK([./input], 0,
-[[Default destructor for 'E' @ 1.
-Default destructor for 'S' @ 1.
+AT_BISON_CHECK([-o input$1.c input$1.y])
+AT_COMPILE([input$1])
+AT_PARSER_CHECK([./input$1], 0,
+[[<]]kind[[> for 'E' @ 1.
+<]]kind[[> for 'S' @ 1.

 ]],
 [[Starting parse
 Entering state 0
 ]],
 [[Starting parse
 Entering state 0

-Reducing stack by rule 1 (line 35):
--> $$ = nterm start (1.1-1.1: Default printer for 'S' @ 1)
+Reducing stack by rule 1 (line 46):
+-> $$ = nterm start (1.1-1.1: <]]kind[[> for 'S' @ 1)

 Stack now 0
 Entering state 1
 Reading a token: Now at end of input.
 Stack now 0
 Entering state 1
 Reading a token: Now at end of input.

-Shifting token END (1.1-1.1: Default printer for 'E' @ 1)
+Shifting token END (1.1-1.1: <]]kind[[> for 'E' @ 1)

 Entering state 2
 Stack now 0 1 2
 Entering state 2
 Stack now 0 1 2

-Cleanup: popping token END (1.1-1.1: Default printer for 'E' @ 1)
-Cleanup: popping nterm start (1.1-1.1: Default printer for 'S' @ 1)
+Cleanup: popping token END (1.1-1.1: <]]kind[[> for 'E' @ 1)
+Cleanup: popping nterm start (1.1-1.1: <]]kind[[> for 'S' @ 1)

 ]])
 
 ]])
 

+m4_popdef([kind])
+m4_popdef([not_kind])
+])
+
+_AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(0)
+_AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(1)
+

 AT_CLEANUP
 
 
 AT_CLEANUP
 
 


@@ -916,7 +931,7 @@ AT_CLEANUP
 ## Default %printer and %destructor are not for error or $undefined.  ##
 ## ------------------------------------------------------------------ ##
 
 ## Default %printer and %destructor are not for error or $undefined.  ##
 ## ------------------------------------------------------------------ ##
 

-AT_SETUP([Default %printer and %destructor are not for error or \$undefined])
+AT_SETUP([Default %printer and %destructor are not for error or $undefined])

 
 # If Bison were to apply the default %printer and %destructor to the error
 # token or to $undefined:
 
 # If Bison were to apply the default %printer and %destructor to the error
 # token or to $undefined:


@@ -926,24 +941,24 @@ AT_SETUP([Default %printer and %destructor are not for error or \$undefined])
 #       semantic value, which would be initialized from the lookahead, which
 #       would be destroyed separately.
 #   - For $undefined, who knows what the semantic value would be.
 #       semantic value, which would be initialized from the lookahead, which
 #       would be destroyed separately.
 #   - For $undefined, who knows what the semantic value would be.

-
+AT_BISON_OPTION_PUSHDEFS

 AT_DATA_GRAMMAR([[input.y]],
 [[%debug
 
 %{
 # include <stdio.h>
 # include <stdlib.h>
 AT_DATA_GRAMMAR([[input.y]],
 [[%debug
 
 %{
 # include <stdio.h>
 # include <stdlib.h>

-  static void yyerror (const char *msg);
-  static int yylex (void);
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[

 # define USE(SYM)
 %}
 
 %printer {
   fprintf (yyoutput, "'%c'", $$);
 # define USE(SYM)
 %}
 
 %printer {
   fprintf (yyoutput, "'%c'", $$);

-} %symbol-default
+} <> <*>

 %destructor {
   fprintf (stderr, "DESTROY '%c'\n", $$);
 %destructor {
   fprintf (stderr, "DESTROY '%c'\n", $$);

-} %symbol-default
+} <> <*>

 
 %%
 
 
 %%
 


@@ -955,24 +970,8 @@ start:
   ;
 
 %%
   ;
 
 %%

-
-static int
-yylex (void)
-{
-  static char const input[] = "abd";
-  static size_t toknum;
-  if (! (toknum < sizeof input))
-    abort ();
-  yylval = input[toknum++];
-  return yylval;
-}
-
-static void
-yyerror (const char *msg)
-{
-  fprintf (stderr, "%s\n", msg);
-}
-
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE([abd], [yylval = res])[

 int
 main (void)
 {
 int
 main (void)
 {


@@ -980,8 +979,9 @@ main (void)
   return yyparse ();
 }
 ]])
   return yyparse ();
 }
 ]])

+AT_BISON_OPTION_POPDEFS

 
 

-AT_CHECK([bison -o input.c input.y])
+AT_BISON_CHECK([-o input.c input.y])

 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], [1], [],
 [[Starting parse
 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], [1], [],
 [[Starting parse


@@ -1026,7 +1026,7 @@ AT_CLEANUP
 ## Default %printer and %destructor are not for $accept.  ##
 ## ------------------------------------------------------ ##
 
 ## Default %printer and %destructor are not for $accept.  ##
 ## ------------------------------------------------------ ##
 

-AT_SETUP([Default %printer and %destructor are not for \$accept])
+AT_SETUP([Default %printer and %destructor are not for $accept])

 
 # If YYSTYPE is a union and Bison were to apply the default %printer and
 # %destructor to $accept:
 
 # If YYSTYPE is a union and Bison were to apply the default %printer and
 # %destructor to $accept:


@@ -1041,25 +1041,26 @@ AT_SETUP([Default %printer and %destructor are not for \$accept])
 #     true for $undefined and the error token, so there are three warnings for
 #     %printer and three for %destructor.)
 
 #     true for $undefined and the error token, so there are three warnings for
 #     %printer and three for %destructor.)
 

+AT_BISON_OPTION_PUSHDEFS

 AT_DATA_GRAMMAR([[input.y]],
 [[%debug /* So that %printer is actually compiled.  */
 
 %{
 # include <stdio.h>
 # include <stdlib.h>
 AT_DATA_GRAMMAR([[input.y]],
 [[%debug /* So that %printer is actually compiled.  */
 
 %{
 # include <stdio.h>
 # include <stdlib.h>

-  static void yyerror (const char *msg);
-  static int yylex (void);
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[

 # define USE(SYM)
 %}
 
 %printer {
   char chr = $$;
   fprintf (yyoutput, "'%c'", chr);
 # define USE(SYM)
 %}
 
 %printer {
   char chr = $$;
   fprintf (yyoutput, "'%c'", chr);

-} %symbol-default
+} <> <*>

 %destructor {
   char chr = $$;
   fprintf (stderr, "DESTROY '%c'\n", chr);
 %destructor {
   char chr = $$;
   fprintf (stderr, "DESTROY '%c'\n", chr);

-} %symbol-default
+} <> <*>

 
 %union { char chr; }
 %type <chr> start
 
 %union { char chr; }
 %type <chr> start


@@ -1068,31 +1069,398 @@ AT_DATA_GRAMMAR([[input.y]],
 
 start: { USE($$); } ;
 
 
 start: { USE($$); } ;
 

+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE([])[
+int
+main (void)
+{
+  return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([-o input.c input.y])
+AT_COMPILE([input])
+
+AT_CLEANUP
+
+
+
+## ------------------------------------------------------ ##
+## Default %printer and %destructor for mid-rule values.  ##
+## ------------------------------------------------------ ##
+
+AT_SETUP([Default %printer and %destructor for mid-rule values])
+
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([[input.y]],
+[[%debug /* So that %printer is actually compiled.  */
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+# define USE(SYM)
+# define YYLTYPE int
+# define YYLLOC_DEFAULT(Current, Rhs, N) (void)(Rhs)
+# define YY_LOCATION_PRINT(File, Loc)
+%}
+
+%printer { fprintf (yyoutput, "%d", @$); } <>
+%destructor { fprintf (stderr, "DESTROY %d\n", @$); } <>
+%printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
+%destructor { fprintf (yyoutput, "<*> destructor should not be called"); } <*>
+
+%%
+
+start:
+  {           @$ = 1; } // Not set or used.
+  { USE ($$); @$ = 2; } // Both set and used.
+  { USE ($$); @$ = 3; } // Only set.
+  {           @$ = 4; } // Only used.
+  'c'
+  { USE (($$, $2, $4, $5)); @$ = 0; }
+  ;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE([])[
+int
+main (void)
+{
+  yydebug = 1;
+  return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([-o input.c input.y], 0,,
+[[input.y:33.3-23: warning: unset value: $$
+input.y:30.3-35.37: warning: unused value: $3
+]])
+
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], 1,,
+[[Starting parse
+Entering state 0
+Reducing stack by rule 1 (line 30):
+-> $$ = nterm $@1 (: )
+Stack now 0
+Entering state 2
+Reducing stack by rule 2 (line 31):
+-> $$ = nterm @2 (: 2)
+Stack now 0 2
+Entering state 4
+Reducing stack by rule 3 (line 32):
+-> $$ = nterm @3 (: 3)
+Stack now 0 2 4
+Entering state 5
+Reducing stack by rule 4 (line 33):
+-> $$ = nterm @4 (: 4)
+Stack now 0 2 4 5
+Entering state 6
+Reading a token: Now at end of input.
+syntax error
+Error: popping nterm @4 (: 4)
+DESTROY 4
+Stack now 0 2 4 5
+Error: popping nterm @3 (: 3)
+DESTROY 3
+Stack now 0 2 4
+Error: popping nterm @2 (: 2)
+DESTROY 2
+Stack now 0 2
+Error: popping nterm $@1 (: )
+Stack now 0
+Cleanup: discarding lookahead token $end (: )
+Stack now 0
+]])
+
+AT_CLEANUP
+
+
+## ----------------------- ##
+## @$ implies %locations.  ##
+## ----------------------- ##
+
+# Bison once forgot to check for @$ in actions other than semantic actions.
+
+# AT_CHECK_ACTION_LOCATIONS(ACTION-DIRECTIVE)
+# -------------------------------------------
+m4_define([AT_CHECK_ACTION_LOCATIONS],
+[AT_SETUP([[@$ in ]$1[ implies %locations]])
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([[input.y]],
+[[%code {
+  #include <stdio.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+}
+
+%debug
+
+]$1[ {
+  printf ("%d\n", @$.first_line);
+} ]m4_if($1, [%initial-action], [], [[start]])[
+
+%%
+
+start:  ;
+

 %%
 
 static int
 yylex (void)
 {
 %%
 
 static int
 yylex (void)
 {

-  static int called;
-  if (called++)
-    abort ();

   return 0;
 }
 
   return 0;
 }
 

-static void
-yyerror (const char *msg)
+]AT_YYERROR_DEFINE[
+int
+main (void)

 {
 {

-  fprintf (stderr, "%s\n", msg);
+  return yyparse ();

 }
 }

+]])
+
+AT_BISON_CHECK([[-o input.c input.y]])
+AT_COMPILE([[input]])
+AT_BISON_OPTION_POPDEFS
+AT_CLEANUP])
+
+AT_CHECK_ACTION_LOCATIONS([[%initial-action]])
+AT_CHECK_ACTION_LOCATIONS([[%destructor]])
+AT_CHECK_ACTION_LOCATIONS([[%printer]])
+
+
+## ----------------------------------------------- ##
+## Fix user actions without a trailing semicolon.  ##
+## ----------------------------------------------- ##
+
+AT_SETUP([[Fix user actions without a trailing semicolon]])
+
+# This feature is undocumented, but we accidentally broke it in 2.3a,
+# and there was a complaint at:
+# <http://lists.gnu.org/archive/html/bug-bison/2008-11/msg00001.html>.
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA([input.y],
+[[%%
+start: test2 test1 test0 testc;
+
+test2
+: 'a' { semi;                   /* TEST:N:2 */ }
+| 'b' { if (0) {no_semi}        /* TEST:N:2 */ }
+| 'c' { if (0) {semi;}          /* TEST:N:2 */ }
+| 'd' { semi;   no_semi         /* TEST:Y:2 */ }
+| 'e' { semi(); no_semi()       /* TEST:Y:2 */ }
+| 'f' { semi[]; no_semi[]       /* TEST:Y:2 */ }
+| 'g' { semi++; no_semi++       /* TEST:Y:2 */ }
+| 'h' { {no_semi} no_semi       /* TEST:Y:2 */ }
+| 'i' { {semi;}   no_semi       /* TEST:Y:2 */ }
+;
+test1
+  : 'a' { semi;                 // TEST:N:1 ;
+} | 'b' { if (0) {no_semi}      // TEST:N:1 ;
+} | 'c' { if (0) {semi;}        // TEST:N:1 ;
+} | 'd' { semi;   no_semi       // TEST:Y:1 ;
+} | 'e' { semi(); no_semi()     // TEST:Y:1 ;
+} | 'f' { semi[]; no_semi[]     // TEST:Y:1 ;
+} | 'g' { semi++; no_semi++     // TEST:Y:1 ;
+} | 'h' { {no_semi} no_semi     // TEST:Y:1 ;
+} | 'i' { {semi;}   no_semi     // TEST:Y:1 ;
+} ;
+test0
+  : 'a' { semi;                 // TEST:N:1 {}
+} | 'b' { if (0) {no_semi}      // TEST:N:1 {}
+} | 'c' { if (0) {semi;}        // TEST:N:1 {}
+} | 'd' { semi;   no_semi       // TEST:Y:1 {}
+} | 'e' { semi(); no_semi()     // TEST:Y:1 {}
+} | 'f' { semi[]; no_semi[]     // TEST:Y:1 {}
+} | 'g' { semi++; no_semi++     // TEST:Y:1 {}
+} | 'h' { {no_semi} no_semi     // TEST:Y:1 {}
+} | 'i' { {semi;}   no_semi     // TEST:Y:1 {}
+} ;
+
+testc
+: 'a' {
+#define TEST_MACRO_N \
+[]"broken\" $ @ $$ @$ [];\
+string;"}
+| 'b' {
+no_semi
+#define TEST_MACRO_N \
+[]"broken\" $ @ $$ @$ [];\
+string;"}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([[-o input.c input.y]], [0], [],
+[[input.y:8.48: warning: a ';' might be needed at the end of action code
+input.y:8.48: warning: future versions of Bison will not add the ';'
+input.y:9.48: warning: a ';' might be needed at the end of action code
+input.y:9.48: warning: future versions of Bison will not add the ';'
+input.y:10.48: warning: a ';' might be needed at the end of action code
+input.y:10.48: warning: future versions of Bison will not add the ';'
+input.y:11.48: warning: a ';' might be needed at the end of action code
+input.y:11.48: warning: future versions of Bison will not add the ';'
+input.y:12.48: warning: a ';' might be needed at the end of action code
+input.y:12.48: warning: future versions of Bison will not add the ';'
+input.y:13.48: warning: a ';' might be needed at the end of action code
+input.y:13.48: warning: future versions of Bison will not add the ';'
+input.y:20.1: warning: a ';' might be needed at the end of action code
+input.y:20.1: warning: future versions of Bison will not add the ';'
+input.y:21.1: warning: a ';' might be needed at the end of action code
+input.y:21.1: warning: future versions of Bison will not add the ';'
+input.y:22.1: warning: a ';' might be needed at the end of action code
+input.y:22.1: warning: future versions of Bison will not add the ';'
+input.y:23.1: warning: a ';' might be needed at the end of action code
+input.y:23.1: warning: future versions of Bison will not add the ';'
+input.y:24.1: warning: a ';' might be needed at the end of action code
+input.y:24.1: warning: future versions of Bison will not add the ';'
+input.y:25.1: warning: a ';' might be needed at the end of action code
+input.y:25.1: warning: future versions of Bison will not add the ';'
+input.y:31.1: warning: a ';' might be needed at the end of action code
+input.y:31.1: warning: future versions of Bison will not add the ';'
+input.y:32.1: warning: a ';' might be needed at the end of action code
+input.y:32.1: warning: future versions of Bison will not add the ';'
+input.y:33.1: warning: a ';' might be needed at the end of action code
+input.y:33.1: warning: future versions of Bison will not add the ';'
+input.y:34.1: warning: a ';' might be needed at the end of action code
+input.y:34.1: warning: future versions of Bison will not add the ';'
+input.y:35.1: warning: a ';' might be needed at the end of action code
+input.y:35.1: warning: future versions of Bison will not add the ';'
+input.y:36.1: warning: a ';' might be needed at the end of action code
+input.y:36.1: warning: future versions of Bison will not add the ';'
+]])
+
+AT_MATCHES_CHECK([input.c], [[/\* TEST:N:2 \*/ \}$]],       [[3]])
+AT_MATCHES_CHECK([input.c], [[/\* TEST:Y:2 \*/ ;\}$]],      [[6]])
+AT_MATCHES_CHECK([input.c], [[// TEST:N:1 [;{}]*\n\}$]],    [[6]])
+AT_MATCHES_CHECK([input.c], [[// TEST:Y:1 [;{}]*\n;\}$]],  [[12]])
+AT_MATCHES_CHECK([input.c], [[#define TEST_MACRO_N \\\n\[\]"broken\\" \$ \@ \$\$ \@\$ \[\];\\\nstring;"\}]], [[2]])

 
 

+AT_CLEANUP
+
+
+## -------------------------------------------------- ##
+## Destroying lookahead assigned by semantic action.  ##
+## -------------------------------------------------- ##
+
+AT_SETUP([[Destroying lookahead assigned by semantic action]])
+
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([input.y],
+[[
+%code {
+  #include <assert.h>
+  #include <stdio.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+  #define USE(Var)
+}
+
+%destructor { fprintf (stderr, "'a' destructor\n"); } 'a'
+%destructor { fprintf (stderr, "'b' destructor\n"); } 'b'
+
+%%
+
+// In a previous version of Bison, yychar assigned by the semantic
+// action below was not translated into yytoken before the lookahead was
+// discarded and thus before its destructor (selected according to
+// yytoken) was called in order to return from yyparse.  This would
+// happen even if YYACCEPT was performed in a later semantic action as
+// long as only consistent states with default reductions were visited
+// in between.  However, we leave YYACCEPT in the same semantic action
+// for this test in order to show that skeletons cannot simply translate
+// immediately after every semantic action because a semantic action
+// that has set yychar might not always return normally.  Instead,
+// skeletons must translate before every use of yytoken.
+start: 'a' accept { USE($1); } ;
+accept: /*empty*/ {
+  assert (yychar == YYEMPTY);
+  yychar = 'b';
+  YYACCEPT;
+} ;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE([a])[

 int
 main (void)
 {
   return yyparse ();
 }
 ]])
 int
 main (void)
 {
   return yyparse ();
 }
 ]])

+AT_BISON_OPTION_POPDEFS
+AT_BISON_CHECK([[-o input.c input.y]])
+AT_COMPILE([[input]])
+AT_PARSER_CHECK([[./input]], [[0]], [],
+[['b' destructor
+'a' destructor
+]])

 
 

-AT_CHECK([bison -o input.c input.y])
-AT_COMPILE([input])
+AT_CLEANUP
+
+## ---------- ##
+## YYBACKUP.  ##
+## ---------- ##
+
+AT_SETUP([[YYBACKUP]])
+
+AT_BISON_OPTION_PUSHDEFS([%pure-parser])
+
+AT_DATA_GRAMMAR([input.y],
+[[
+%error-verbose
+%debug
+%pure-parser
+%code {
+# include <stdio.h>
+# include <stdlib.h>
+# include <assert.h>
+
+  ]AT_YYERROR_DECLARE[
+  static int yylex (YYSTYPE *yylval);
+}
+%%
+input:
+  exp exp {}
+;
+
+exp:
+  'a'     { printf ("a: %d\n", $1); }
+| 'b'     { YYBACKUP('a', 123); }
+| 'c' 'd' { YYBACKUP('a', 456); }
+;
+
+%%
+]AT_YYERROR_DEFINE[
+static int
+yylex (YYSTYPE *yylval)
+{
+  static char const input[] = "bcd";
+  static size_t toknum;
+  assert (toknum < sizeof input);
+  *yylval = (toknum + 1) * 10;
+  return input[toknum++];
+}
+
+int
+main (void)
+{
+  yydebug = !!getenv("YYDEBUG");
+  return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([[-o input.c input.y]])
+AT_COMPILE([[input]])
+AT_PARSER_CHECK([[./input]], [[0]],
+[[a: 123
+a: 456
+]])

 
 AT_CLEANUP
 
 AT_CLEANUP