* README: Mention m4 1.4.3. Remove obsolete advice about

[bison.git] / tests / regression.at

diff --git a/tests/regression.at b/tests/regression.at
index f6b5fe0d5fa77586f19e26b64576f1d8ad33201c..fe7c31b496fb7ddd278430acc2ebae3c55e14a14 100644 (file)
--- a/tests/regression.at
+++ b/tests/regression.at
@@ -1,5 +1,5 @@
 # Bison Regressions.                               -*- Autotest -*-
 # Bison Regressions.                               -*- Autotest -*-

-# Copyright 2001 Free Software Foundation, Inc.
+# Copyright (C) 2001, 2002, 2003, 2004, 2005 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
 
 # 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


@@ -13,588 +13,805 @@
 
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
 
 # 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., 59 Temple Place - Suite 330, Boston, MA
-# 02111-1307, USA.
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.

 
 AT_BANNER([[Regression tests.]])
 
 
 AT_BANNER([[Regression tests.]])
 

-## ------------------ ##
-## Duplicate string.  ##
-## ------------------ ##

 
 

+## ------------------------- ##
+## Early token definitions.  ##
+## ------------------------- ##

 
 

-AT_SETUP([Duplicate string])

 
 

-AT_DATA([duplicate.y],
-[[/* `Bison -v' used to dump core when two tokens are defined with the same
-   string, as LE and GE below. */
+AT_SETUP([Early token definitions])

 
 

-%token NUM
-%token LE "<="
-%token GE "<="
+# Found in GCJ: they expect the tokens to be defined before the user
+# prologue, so that they can use the token definitions in it.
+
+AT_DATA_GRAMMAR([input.y],
+[[%{
+void yyerror (const char *s);
+int yylex (void);
+%}

 
 

+%union
+{
+  int val;
+};
+%{
+#ifndef MY_TOKEN
+# error "MY_TOKEN not defined."
+#endif
+%}
+%token MY_TOKEN

 %%
 %%

-exp: '(' exp ')' | NUM ;
+exp: MY_TOKEN;

 %%
 ]])
 
 %%
 ]])
 

-AT_CHECK([bison -v duplicate.y -o duplicate.c], 0, ignore, ignore)
+AT_CHECK([bison -o input.c input.y])
+AT_COMPILE([input.o], [-c input.c])

 
 AT_CLEANUP
 
 
 
 AT_CLEANUP
 
 

-## ------------------------- ##
-## Unresolved SR Conflicts.  ##
-## ------------------------- ##
-
-AT_SETUP([Unresolved SR Conflicts])
-
-AT_DATA([input.y],
-[[%token NUM OP
-%%
-exp: exp OP exp | NUM;
-]])
-
-AT_CHECK([bison input.y -o input.c -v], 0, [],
-[input.y contains 1 shift/reduce conflict.
-])
-
-# Check the contents of the report.
-AT_CHECK([cat input.output], [],
-[[State 4 contains 1 shift/reduce conflict.
-
-Grammar
-
-  Number, Line, Rule
-    1   3 exp -> exp OP exp
-    2   3 exp -> NUM
-
-Terminals, with rules where they appear
-
-$ (-1)
-error (256)
-NUM (257) 2
-OP (258) 1

 
 

-Nonterminals, with rules where they appear
+## ---------------- ##
+## Braces parsing.  ##
+## ---------------- ##

 
 

-exp (5)
-    on left: 1 2, on right: 1

 
 

+AT_SETUP([Braces parsing])

 
 

-state 0
-
-    NUM        shift, and go to state 1
+AT_DATA([input.y],
+[[/* Bison used to swallow the character after `}'. */

 
 

-    exp        go to state 2
+%%
+exp: { tests = {{{{{{{{{{}}}}}}}}}}; };
+%%
+]])

 
 

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

 
 

+AT_CHECK([grep 'tests = {{{{{{{{{{}}}}}}}}}};' input.c], 0, [ignore])

 
 

-state 1
+AT_CLEANUP

 
 

-    exp  ->  NUM .   (rule 2)

 
 

-    $default   reduce using rule 2 (exp)
+## ------------------ ##
+## Duplicate string.  ##
+## ------------------ ##

 
 
 
 

+AT_SETUP([Duplicate string])

 
 

-state 2
+AT_DATA([input.y],
+[[/* `Bison -v' used to dump core when two tokens are defined with the same
+   string, as LE and GE below. */

 
 

-    exp  ->  exp . OP exp   (rule 1)
+%token NUM
+%token LE "<="
+%token GE "<="

 
 

-    $          go to state 5
-    OP         shift, and go to state 3
+%%
+exp: '(' exp ')' | NUM ;
+%%
+]])

 
 

+AT_CHECK([bison -v -o input.c input.y], 0, [],
+[[input.y:6.8-14: warning: symbol `"<="' used more than once as a literal string
+]])

 
 

+AT_CLEANUP

 
 

-state 3

 
 

-    exp  ->  exp OP . exp   (rule 1)
+## ------------------- ##
+## Rule Line Numbers.  ##
+## ------------------- ##

 
 

-    NUM        shift, and go to state 1
+AT_SETUP([Rule Line Numbers])

 
 

-    exp        go to state 4
+AT_KEYWORDS([report])

 
 

+AT_DATA([input.y],
+[[%%
+expr:
+'a'

 
 

+{

 
 

-state 4
+}

 
 

-    exp  ->  exp . OP exp   (rule 1)
-    exp  ->  exp OP exp .   (rule 1)
+'b'

 
 

-    OP         shift, and go to state 3
+{

 
 

-    OP         [reduce using rule 1 (exp)]
-    $default   reduce using rule 1 (exp)
+}

 
 

+|

 
 
 
 

-state 5
+{

 
 

-    $          go to state 6

 
 

+}

 
 

+'c'

 
 

-state 6
+{

 
 

-    $default   accept
+};

 ]])
 
 ]])
 

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

 
 

-## --------------------- ##
-## Solved SR Conflicts.  ##
-## --------------------- ##
+# Check the contents of the report.
+AT_CHECK([cat input.output], [],
+[[Grammar

 
 

-AT_SETUP([Solved SR Conflicts])
+    0 $accept: expr $end

 
 

-AT_DATA([input.y],
-[[%token NUM OP
-%right OP
-%%
-exp: exp OP exp | NUM;
-]])
+    1 @1: /* empty */

 
 

-AT_CHECK([bison input.y -o input.c -v], 0, [], [])
+    2 expr: 'a' @1 'b'

 
 

-# Check the contents of the report.
-AT_CHECK([cat input.output], [],
-[[Conflict in state 4 between rule 1 and token OP resolved as shift.
+    3 @2: /* empty */

 
 

-Grammar
+    4 expr: @2 'c'

 
 

-  Number, Line, Rule
-    1   4 exp -> exp OP exp
-    2   4 exp -> NUM

 
 Terminals, with rules where they appear
 
 
 Terminals, with rules where they appear
 

-$ (-1)
+$end (0) 0
+'a' (97) 2
+'b' (98) 2
+'c' (99) 4

 error (256)
 error (256)

-NUM (257) 2
-OP (258) 1
+

 
 Nonterminals, with rules where they appear
 
 
 Nonterminals, with rules where they appear
 

-exp (5)
-    on left: 1 2, on right: 1
+$accept (6)
+    on left: 0
+expr (7)
+    on left: 2 4, on right: 0
+@1 (8)
+    on left: 1, on right: 2
+@2 (9)
+    on left: 3, on right: 4

 
 
 state 0
 
 
 
 state 0
 

-    NUM        shift, and go to state 1
+    0 $accept: . expr $end
+
+    'a'  shift, and go to state 1

 
 

-    exp        go to state 2
+    $default  reduce using rule 3 (@2)

 
 

+    expr  go to state 2
+    @2    go to state 3

 
 
 state 1
 
 
 
 state 1
 

-    exp  ->  NUM .   (rule 2)
+    2 expr: 'a' . @1 'b'

 
 

-    $default   reduce using rule 2 (exp)
+    $default  reduce using rule 1 (@1)

 
 

+    @1  go to state 4

 
 
 state 2
 
 
 
 state 2
 

-    exp  ->  exp . OP exp   (rule 1)
-
-    $          go to state 5
-    OP         shift, and go to state 3
+    0 $accept: expr . $end

 
 

+    $end  shift, and go to state 5

 
 
 state 3
 
 
 
 state 3
 

-    exp  ->  exp OP . exp   (rule 1)
-
-    NUM        shift, and go to state 1
-
-    exp        go to state 4
+    4 expr: @2 . 'c'

 
 

+    'c'  shift, and go to state 6

 
 
 state 4
 
 
 
 state 4
 

-    exp  ->  exp . OP exp   (rule 1)
-    exp  ->  exp OP exp .   (rule 1)
-
-    OP         shift, and go to state 3
-
-    $default   reduce using rule 1 (exp)
+    2 expr: 'a' @1 . 'b'

 
 

+    'b'  shift, and go to state 7

 
 
 state 5
 
 
 
 state 5
 

-    $          go to state 6
+    0 $accept: expr $end .

 
 

+    $default  accept

 
 
 state 6
 
 
 
 state 6
 

-    $default   accept
-]])
+    4 expr: @2 'c' .

 
 

-AT_CLEANUP
+    $default  reduce using rule 4 (expr)

 
 
 
 

+state 7

 
 

+    2 expr: 'a' @1 'b' .

 
 

-## ------------------- ##
-## Rule Line Numbers.  ##
-## ------------------- ##
+    $default  reduce using rule 2 (expr)
+]])

 
 

-AT_SETUP([Rule Line Numbers])
+AT_CLEANUP

 
 

-AT_DATA([input.y],
-[[%%
-expr:
-'a'

 
 

-{

 
 

-}
+## ---------------------- ##
+## Mixing %token styles.  ##
+## ---------------------- ##

 
 

-'b'

 
 

-{
+AT_SETUP([Mixing %token styles])

 
 

-}
+# Taken from the documentation.
+AT_DATA([input.y],
+[[%token  <operator>  OR      "||"
+%token  <operator>  LE 134  "<="
+%left  OR  "<="
+%%
+exp: ;
+%%
+]])

 
 

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

 
 

+AT_CLEANUP

 
 

-{

 
 
 
 

-}
+## ---------------- ##
+## Invalid inputs.  ##
+## ---------------- ##

 
 

-'c'

 
 

-{
+AT_SETUP([Invalid inputs])

 
 

-}
+AT_DATA([input.y],
+[[%%
+?
+default: 'a' }
+%&
+%a-does-not-exist
+%-
+%{

 ]])
 
 ]])
 

-AT_CHECK([bison input.y -o input.c -v], 0, [], [])
-
-# Check the contents of the report.
-AT_CHECK([cat input.output], [],
-[[
-Grammar
-
-  Number, Line, Rule
-    1   2 @1 -> /* empty */
-    2   2 expr -> 'a' @1 'b'
-    3  15 @2 -> /* empty */
-    4  15 expr -> @2 'c'
-
-Terminals, with rules where they appear
-
-$ (-1)
-'a' (97) 2
-'b' (98) 2
-'c' (99) 4
-error (256)
-
-Nonterminals, with rules where they appear
+AT_CHECK([bison input.y], [1], [],
+[[input.y:2.1: invalid character: `?'
+input.y:3.14: invalid character: `}'
+input.y:4.1: invalid character: `%'
+input.y:4.2: invalid character: `&'
+input.y:5.1-17: invalid directive: `%a-does-not-exist'
+input.y:6.1: invalid character: `%'
+input.y:6.2: invalid character: `-'
+input.y:7.1-8.0: missing `%}' at end of file
+]])

 
 

-expr (6)
-    on left: 2 4
-@1 (7)
-    on left: 1, on right: 2
-@2 (8)
-    on left: 3, on right: 4
+AT_CLEANUP

 
 
 
 

-state 0

 
 

-    'a'        shift, and go to state 1
+## ------------------- ##
+## Token definitions.  ##
+## ------------------- ##

 
 

-    $default   reduce using rule 3 (@2)

 
 

-    expr       go to state 6
-    @2         go to state 2
+AT_SETUP([Token definitions])
+
+# Bison managed, when fed with `%token 'f' "f"' to #define 'f'!
+AT_DATA_GRAMMAR([input.y],
+[%{
+#include <stdio.h>
+void yyerror (const char *s);
+int yylex (void);
+%}
+[%error-verbose
+%token MYEOF 0 "end of file"
+%token 'a' "a"
+%token B_TOKEN "b"
+%token C_TOKEN 'c'
+%token 'd' D_TOKEN
+%token SPECIAL "\\\'\?\"\n\t??!"
+%%
+exp: "a" "\\\'\?\"\n\t??!";
+%%
+void
+yyerror (char const *s)
+{
+  fprintf (stderr, "%s\n", s);
+}

 
 

+int
+yylex (void)
+{
+  return SPECIAL;
+}

 
 

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

 
 

-state 1
+AT_CHECK([bison -o input.c input.y])
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], 1, [],
+[syntax error, unexpected \'?"
+       ??!, expecting a
+])
+AT_CLEANUP

 
 

-    expr  ->  'a' . @1 'b'   (rule 2)

 
 

-    $default   reduce using rule 1 (@1)

 
 

-    @1         go to state 3
+## -------------------- ##
+## Characters Escapes.  ##
+## -------------------- ##

 
 
 
 

+AT_SETUP([Characters Escapes])

 
 

-state 2
+AT_DATA_GRAMMAR([input.y],
+[%{
+void yyerror (const char *s);
+int yylex (void);
+%}
+[%%
+exp:
+  '\'' "\'"
+| '\"' "\""
+| '"'  "'"
+;
+]])
+# Pacify font-lock-mode: "

 
 

-    expr  ->  @2 . 'c'   (rule 4)
+AT_CHECK([bison -o input.c input.y])
+AT_COMPILE([input.o], [-c input.c])
+AT_CLEANUP

 
 

-    'c'        shift, and go to state 4

 
 
 
 

+## -------------- ##
+## Web2c Report.  ##
+## -------------- ##

 
 

-state 3
+# The generation of the reduction was once wrong in Bison, and made it
+# miss some reductions.  In the following test case, the reduction on
+# `undef_id_tok' in state 1 was missing.  This is stripped down from
+# the actual web2c.y.

 
 

-    expr  ->  'a' @1 . 'b'   (rule 2)
+AT_SETUP([Web2c Report])

 
 

-    'b'        shift, and go to state 5
+AT_KEYWORDS([report])

 
 

+AT_DATA([input.y],
+[[%token       undef_id_tok const_id_tok

 
 

+%start CONST_DEC_PART
+\f
+%%
+CONST_DEC_PART:
+         CONST_DEC_LIST
+        ;
+
+CONST_DEC_LIST:
+         CONST_DEC
+        | CONST_DEC_LIST CONST_DEC
+        ;
+
+CONST_DEC:
+         { } undef_id_tok '=' const_id_tok ';'
+        ;
+%%
+]])

 
 

-state 4
+AT_CHECK([bison -v input.y])
+AT_CHECK([cat input.output], 0,
+[[Grammar

 
 

-    expr  ->  @2 'c' .   (rule 4)
+    0 $accept: CONST_DEC_PART $end

 
 

-    $default   reduce using rule 4 (expr)
+    1 CONST_DEC_PART: CONST_DEC_LIST

 
 

+    2 CONST_DEC_LIST: CONST_DEC
+    3               | CONST_DEC_LIST CONST_DEC

 
 

+    4 @1: /* empty */

 
 

-state 5
+    5 CONST_DEC: @1 undef_id_tok '=' const_id_tok ';'

 
 

-    expr  ->  'a' @1 'b' .   (rule 2)

 
 

-    $default   reduce using rule 2 (expr)
+Terminals, with rules where they appear

 
 

+$end (0) 0
+';' (59) 5
+'=' (61) 5
+error (256)
+undef_id_tok (258) 5
+const_id_tok (259) 5

 
 
 
 

-state 6
+Nonterminals, with rules where they appear

 
 

-    $          go to state 7
+$accept (7)
+    on left: 0
+CONST_DEC_PART (8)
+    on left: 1, on right: 0
+CONST_DEC_LIST (9)
+    on left: 2 3, on right: 1 3
+CONST_DEC (10)
+    on left: 5, on right: 2 3
+@1 (11)
+    on left: 4, on right: 5

 
 
 
 

+state 0

 
 

-state 7
+    0 $accept: . CONST_DEC_PART $end

 
 

-    $          go to state 8
+    $default  reduce using rule 4 (@1)

 
 

+    CONST_DEC_PART  go to state 1
+    CONST_DEC_LIST  go to state 2
+    CONST_DEC       go to state 3
+    @1              go to state 4

 
 
 
 

-state 8
+state 1

 
 

-    $default   accept
-]])
+    0 $accept: CONST_DEC_PART . $end

 
 

-AT_CLEANUP
+    $end  shift, and go to state 5

 
 
 
 

+state 2

 
 

-## -------------------- ##
-## %expect not enough.  ##
-## -------------------- ##
+    1 CONST_DEC_PART: CONST_DEC_LIST .
+    3 CONST_DEC_LIST: CONST_DEC_LIST . CONST_DEC

 
 

-AT_SETUP([%expect not enough])
+    undef_id_tok  reduce using rule 4 (@1)
+    $default      reduce using rule 1 (CONST_DEC_PART)

 
 

-AT_DATA([input.y],
-[[%token NUM OP
-%expect 0
-%%
-exp: exp OP exp | NUM;
-]])
+    CONST_DEC  go to state 6
+    @1         go to state 4

 
 

-AT_CHECK([bison input.y -o input.c], 1, [],
-[input.y contains 1 shift/reduce conflict.
-expected 0 shift/reduce conflicts
-])
-AT_CLEANUP

 
 

+state 3

 
 

-## --------------- ##
-## %expect right.  ##
-## --------------- ##
+    2 CONST_DEC_LIST: CONST_DEC .

 
 

-AT_SETUP([%expect right])
+    $default  reduce using rule 2 (CONST_DEC_LIST)

 
 

-AT_DATA([input.y],
-[[%token NUM OP
-%expect 1
-%%
-exp: exp OP exp | NUM;
-]])

 
 

-AT_CHECK([bison input.y -o input.c], 0)
-AT_CLEANUP
+state 4

 
 

+    5 CONST_DEC: @1 . undef_id_tok '=' const_id_tok ';'

 
 

-## ------------------ ##
-## %expect too much.  ##
-## ------------------ ##
+    undef_id_tok  shift, and go to state 7

 
 

-AT_SETUP([%expect too much])

 
 

-AT_DATA([input.y],
-[[%token NUM OP
-%expect 2
-%%
-exp: exp OP exp | NUM;
-]])
+state 5

 
 

-AT_CHECK([bison input.y -o input.c], 1, [],
-[input.y contains 1 shift/reduce conflict.
-expected 2 shift/reduce conflicts
-])
-AT_CLEANUP
+    0 $accept: CONST_DEC_PART $end .

 
 

+    $default  accept

 
 

-## ---------------------- ##
-## Mixing %token styles.  ##
-## ---------------------- ##

 
 

+state 6

 
 

-AT_SETUP([Mixing %token styles])
+    3 CONST_DEC_LIST: CONST_DEC_LIST CONST_DEC .

 
 

-# Taken from the documentation.
-AT_DATA([input.y],
-[[%token  <operator>  OR      "||"
-%token  <operator>  LE 134  "<="
-%left  OR  "<="
-%%
-exp: ;
-%%
-]])
+    $default  reduce using rule 3 (CONST_DEC_LIST)

 
 

-AT_CHECK([bison -v input.y -o input.c], 0, ignore, ignore)

 
 

-AT_CLEANUP
+state 7

 
 

+    5 CONST_DEC: @1 undef_id_tok . '=' const_id_tok ';'

 
 

+    '='  shift, and go to state 8

 
 

-## ---------------------- ##
-## %union and --defines.  ##
-## ---------------------- ##

 
 

+state 8

 
 

-AT_SETUP([%union and --defines])
+    5 CONST_DEC: @1 undef_id_tok '=' . const_id_tok ';'

 
 

-AT_DATA([union.y],
-[%union
-{
-  int   integer;
-  char *string ;
-}
-%%
-exp: {};
-])
+    const_id_tok  shift, and go to state 9

 
 

-AT_CHECK([bison --defines union.y])

 
 

-AT_CLEANUP
+state 9

 
 

+    5 CONST_DEC: @1 undef_id_tok '=' const_id_tok . ';'

 
 

-## --------------------------------------- ##
-## Duplicate '/' in C comments in %union   ##
-## --------------------------------------- ##
+    ';'  shift, and go to state 10

 
 
 
 

-AT_SETUP([%union and C comments])
+state 10

 
 

-AT_DATA([union-comment.y],
-[%union
-{
-  /* The int.  */      int   integer;
-  /* The string.  */   char *string ;
-}
-%%
-exp: {};
-])
+    5 CONST_DEC: @1 undef_id_tok '=' const_id_tok ';' .

 
 

-AT_CHECK([bison union-comment.y])
-AT_CHECK([fgrep '//*' union-comment.tab.c], [1], [])
+    $default  reduce using rule 5 (CONST_DEC)
+]])

 
 AT_CLEANUP
 
 
 
 AT_CLEANUP
 
 

-## ----------------- ##
-## Invalid input 1.  ##
-## ----------------- ##
-
-
-AT_SETUP([Invalid input: 1])
-
-AT_DATA([input.y],
-[[%%
-?
-]])
-
-AT_CHECK([bison input.y], [1], [],
-[[input.y:2: invalid input: `?'
-input.y:3: fatal error: no rules in the input grammar
-]])
-
-AT_CLEANUP
+## --------------- ##
+## Web2c Actions.  ##
+## --------------- ##

 
 

+# The generation of the mapping `state -> action' was once wrong in
+# extremely specific situations.  web2c.y exhibits this situation.
+# Below is a stripped version of the grammar.  It looks like one can
+# simplify it further, but just don't: it is tuned to exhibit a bug,
+# which disapears when applying sane grammar transformations.
+#
+# It used to be wrong on yydefact only:
+#
+# static const short int yydefact[] =
+#  {
+# -       2,     0,     1,     0,     0,     2,     3,     2,     5,     4,
+# +       2,     0,     1,     0,     0,     0,     3,     2,     5,     4,
+#         0,     0
+#  };
+#
+# but let's check all the tables.

 
 

-## ----------------- ##
-## Invalid input 2.  ##
-## ----------------- ##

 
 

+AT_SETUP([Web2c Actions])

 
 

-AT_SETUP([Invalid input: 2])
+AT_KEYWORDS([report])

 
 AT_DATA([input.y],
 [[%%
 
 AT_DATA([input.y],
 [[%%

-default: 'a' }
-]])
-
-AT_CHECK([bison input.y], [1], [],
-[[input.y:2: invalid input: `}'
+statement:  struct_stat;
+struct_stat:  /* empty. */ | if else;
+if: "if" "const" "then" statement;
+else: "else" statement;
+%%

 ]])
 
 ]])
 

-AT_CLEANUP
-
-
-
-## -------------------- ##
-## Invalid %directive.  ##
-## -------------------- ##
-
+AT_CHECK([bison -v -o input.c input.y])

 
 

-AT_SETUP([Invalid %directive])
-
-AT_DATA([input.y],
-[[%invalid
-]])
+# Check only the tables.  We don't use --no-parser, because it is
+# still to be implemented in the experimental branch of Bison.
+[sed -n 's/  *$//;/^static const.*\[\] =/,/^}/p' input.c >tables.c]

 
 

-AT_CHECK([bison input.y], [1], [],
-[[input.y:1: unrecognized: %invalid
-input.y:1:    Skipping to next %
-input.y:2: fatal error: no input grammar
+AT_CHECK([[cat tables.c]], 0,
+[[static const unsigned char yytranslate[] =
+{
+       0,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     1,     2,     3,     4,
+       5,     6
+};
+static const unsigned char yyprhs[] =
+{
+       0,     0,     3,     5,     6,     9,    14
+};
+static const yysigned_char yyrhs[] =
+{
+       8,     0,    -1,     9,    -1,    -1,    10,    11,    -1,     3,
+       4,     5,     8,    -1,     6,     8,    -1
+};
+static const unsigned char yyrline[] =
+{
+       0,     2,     2,     3,     3,     4,     5
+};
+static const char *const yytname[] =
+{
+  "$end", "error", "$undefined", "if", "const", "then", "else", "$accept",
+  "statement", "struct_stat", "if", "else", 0
+};
+static const unsigned short int yytoknum[] =
+{
+       0,   256,   257,   258,   259,   260,   261
+};
+static const unsigned char yyr1[] =
+{
+       0,     7,     8,     9,     9,    10,    11
+};
+static const unsigned char yyr2[] =
+{
+       0,     2,     1,     0,     2,     4,     2
+};
+static const unsigned char yydefact[] =
+{
+       3,     0,     0,     2,     0,     0,     1,     3,     4,     3,
+       6,     5
+};
+static const yysigned_char yydefgoto[] =
+{
+      -1,     2,     3,     4,     8
+};
+static const yysigned_char yypact[] =
+{
+      -2,    -1,     4,    -8,     0,     2,    -8,    -2,    -8,    -2,
+      -8,    -8
+};
+static const yysigned_char yypgoto[] =
+{
+      -8,    -7,    -8,    -8,    -8
+};
+static const unsigned char yytable[] =
+{
+      10,     1,    11,     5,     6,     0,     7,     9
+};
+static const yysigned_char yycheck[] =
+{
+       7,     3,     9,     4,     0,    -1,     6,     5
+};
+static const unsigned char yystos[] =
+{
+       0,     3,     8,     9,    10,     4,     0,     6,    11,     5,
+       8,     8
+};

 ]])
 
 AT_CLEANUP
 
 
 ]])
 
 AT_CLEANUP
 
 

+## ------------------------- ##
+## yycheck Bound Violation.  ##
+## ------------------------- ##

 
 

-## --------------------- ##
-## Invalid CPP headers.  ##
-## --------------------- ##
-
-# AT_TEST_CPP_GUARD_H([INPUT-FILE-BASE)
-# -------------------------------------
-m4_define([AT_TEST_CPP_GUARD_H],
-[AT_SETUP([Invalid CPP guards: $1])

 
 

-# Possibly create inner directories.
-dirname=`AS_DIRNAME([$1])`
-AS_MKDIR_P([$dirname])
+# _AT_DATA_DANCER_Y(BISON-OPTIONS)
+# --------------------------------
+# The following grammar, taken from Andrew Suffield's GPL'd implementation
+# of DGMTP, the Dancer Generic Message Transport Protocol, used to violate
+# yycheck's bounds where issuing a verbose error message.  Keep this test
+# so that possible bound checking compilers could check all the skeletons.
+m4_define([_AT_DATA_DANCER_Y],
+[AT_DATA_GRAMMAR([dancer.y],
+[%{
+static int yylex (AT_LALR1_CC_IF([int *], [void]));
+AT_LALR1_CC_IF([],
+[#include <stdio.h>
+static void yyerror (const char *);])
+%}
+$1
+%token ARROW INVALID NUMBER STRING DATA
+%defines
+%verbose
+%error-verbose
+/* Grammar follows */
+%%
+line: header body
+   ;
+
+header: '<' from ARROW to '>' type ':'
+   | '<' ARROW to '>' type ':'
+   | ARROW to type ':'
+   | type ':'
+   | '<' '>'
+   ;
+
+from: DATA
+   | STRING
+   | INVALID
+   ;
+
+to: DATA
+   | STRING
+   | INVALID
+   ;
+
+type: DATA
+   | STRING
+   | INVALID
+   ;
+
+body: /* empty */
+   | body member
+   ;
+
+member: STRING
+   | DATA
+   | '+' NUMBER
+   | '-' NUMBER
+   | NUMBER
+   | INVALID
+   ;
+%%
+AT_LALR1_CC_IF(
+[/* A C++ error reporting function. */
+void
+yy::parser::error (const location&, const std::string& m)
+{
+  std::cerr << m << std::endl;
+}

 
 

-AT_DATA([$1.y],
-[%%
-dummy:
+int
+yyparse ()
+{
+  yy::parser parser;
+  parser.set_debug_level (!!YYDEBUG);
+  return parser.parse ();
+}
+],
+[static void
+yyerror (const char *s)
+{
+  fprintf (stderr, "%s\n", s);
+}])
+
+static int
+yylex (AT_LALR1_CC_IF([int *lval], [void]))
+[{
+  static int toknum = 0;
+  int tokens[] =
+    {
+      ':', -1
+    };
+  ]AT_LALR1_CC_IF([*lval = 0; /* Pacify GCC.  */])[
+  return tokens[toknum++];
+}]
+
+int
+main (void)
+{
+  return yyparse ();
+}

 ])
 ])

-
-AT_CHECK([bison --defines=$1.h $1.y])
-
-# CPP should be happy with it.
-AT_CHECK([$CC -E $1.h], 0, [ignore])
-
+])# _AT_DATA_DANCER_Y
+
+
+# AT_CHECK_DANCER(BISON-OPTIONS)
+# ------------------------------
+# Generate the grammar, compile it, run it.
+m4_define([AT_CHECK_DANCER],
+[AT_SETUP([Dancer $1])
+AT_BISON_OPTION_PUSHDEFS([$1])
+_AT_DATA_DANCER_Y([$1])
+AT_CHECK([bison -o dancer.c dancer.y])
+AT_LALR1_CC_IF(
+  [AT_CHECK([bison -o dancer.cc dancer.y])
+   AT_COMPILE_CXX([dancer])],
+  [AT_CHECK([bison -o dancer.c dancer.y])
+   AT_COMPILE([dancer])])
+AT_PARSER_CHECK([./dancer], 1, [],
+[syntax error, unexpected ':'
+])
+AT_BISON_OPTION_POPDEFS

 AT_CLEANUP
 ])
 
 AT_CLEANUP
 ])
 

-AT_TEST_CPP_GUARD_H([input/input])
-AT_TEST_CPP_GUARD_H([9foo])
+AT_CHECK_DANCER()
+AT_CHECK_DANCER([%glr-parser])
+AT_CHECK_DANCER([%skeleton "lalr1.cc"])