warnings: raise warning for useless printers or destructors

[bison.git] / tests / input.at

# Checking the Bison scanner.                    -*- Autotest -*-

# Copyright (C) 2002-2012 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/>.

AT_BANNER([[Input Processing.]])

# Mostly test that we are robust to mistakes.


## ------------ ##
## Invalid $n.  ##
## ------------ ##

AT_SETUP([Invalid $n and @n])

AT_DATA([input.y],
[[%%
exp: { $$ = $1 ; };
exp: { @$ = @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'
]])

AT_CLEANUP


## -------------- ##
## Type Clashes.  ##
## -------------- ##

AT_SETUP([Type Clashes])

AT_DATA([input.y],
[[%union { int bar; }
%token foo
%type <bar> exp
%%
exp: foo { $$; } foo { $2; } foo
   | foo
   | /* Empty. */
   ;
]])

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:5.6-32: 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
]])

AT_CLEANUP


# _AT_UNUSED_VALUES_DECLARATIONS()
# --------------------------------
# Generate the token, type, and destructor
# declarations for the unused values tests.
m4_define([_AT_UNUSED_VALUES_DECLARATIONS],
[[[%token <integer> INT;
%type <integer> a b c d e f g h i j k l;
%destructor { destroy ($$); } INT a b c d e f g h i j k l;]]])


# AT_CHECK_UNUSED_VALUES(DECLARATIONS_AFTER, CHECK_MIDRULE_VALUES)
# ----------------------------------------------------------------
# Generate a grammar to test unused values, compile it, run it.  If
# DECLARATIONS_AFTER is set, then the token, type, and destructor
# declarations are generated after the rules rather than before.  If
# CHECK_MIDRULE_VALUES is set, then --warnings=midrule-values is set.
m4_define([AT_CHECK_UNUSED_VALUES],
[AT_DATA([input.y],
m4_ifval($1, [


], [_AT_UNUSED_VALUES_DECLARATIONS
])[[%%
start:
  'a' a { $]2[; } | 'b' b { $]2[; } | 'c' c { $]2[; } | 'd' d { $]2[; }
| 'e' e { $]2[; } | 'f' f { $]2[; } | 'g' g { $]2[; } | 'h' h { $]2[; }
| 'i' i { $]2[; } | 'j' j { $]2[; } | 'k' k { $]2[; } | 'l' l { $]2[; }
;

a: INT | INT { } INT { } INT { };
b: INT | /* empty */;
c: INT | INT { $]1[; } INT { $<integer>2; } INT { $<integer>4; };
d: INT | INT { } INT { $]1[; } INT { $<integer>2; };
e: INT | INT { } INT {  } INT { $]1[; };
f: INT | INT { } INT {  } INT { $]$[ = $]1[ + $]3[ + $]5[; };
g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
i: INT | INT INT { } { $]$[ = $]1[ + $]2[; };
j: INT | INT INT { $<integer>$ = 1; } { $]$[ = $]1[ + $]2[; };
k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
l: INT | INT { $<integer>$ = $<integer>1; } INT { $<integer>$ = $<integer>2 + $<integer>3; } INT { $<integer>$ = $<integer>4 + $<integer>5; };]]m4_ifval($1, [
_AT_UNUSED_VALUES_DECLARATIONS])
)

AT_BISON_CHECK(m4_ifval($2, [ --warnings=midrule-values ])[ input.y], [0], [],
[[input.y:11.10-32: warning: unset value: $]$[
input.y:11.10-32: warning: unused value: $]1[
input.y:11.10-32: warning: unused value: $]3[
input.y:11.10-32: warning: unused value: $]5[
input.y:12.9: warning: empty rule for typed nonterminal, and no action
]]m4_ifval($2, [[[input.y:13.14-20: warning: unset value: $$
input.y:13.26-41: warning: unset value: $$
]]])[[input.y:13.10-62: warning: unset value: $]$[
input.y:13.10-62: warning: unused value: $]3[
input.y:13.10-62: warning: unused value: $]5[
]]m4_ifval($2, [[[input.y:14.14-16: warning: unset value: $$
]]])[[input.y:14.10-49: warning: unset value: $]$[
input.y:14.10-49: warning: unused value: $]3[
input.y:14.10-49: warning: unused value: $]5[
input.y:15.10-37: warning: unset value: $]$[
input.y:15.10-37: warning: unused value: $]3[
input.y:15.10-37: warning: unused value: $]5[
input.y:17.10-58: warning: unset value: $]$[
input.y:17.10-58: warning: unused value: $]1[
]]m4_ifval($2, [[[input.y:17.10-58: warning: unused value: $]2[
]]])[[input.y:17.10-58: warning: unused value: $]3[
]]m4_ifval($2, [[[input.y:17.10-58: warning: unused value: $]4[
]]])[[input.y:17.10-58: warning: unused value: $]5[
input.y:18.10-72: warning: unset value: $]$[
input.y:18.10-72: warning: unused value: $]1[
input.y:18.10-72: warning: unused value: $]3[
]]m4_ifval($2, [[[input.y:18.10-72: warning: unused value: $]4[
]]])[[input.y:18.10-72: warning: unused value: $]5[
]]m4_ifval($2, [[[input.y:20.10-55: warning: unused value: $]3[
]]])[[input.y:21.10-68: warning: unset value: $]$[
input.y:21.10-68: warning: unused value: $]1[
input.y:21.10-68: warning: unused value: $]2[
]]m4_ifval($2, [[[input.y:21.10-68: warning: unused value: $]4[
]]]))])


## --------------- ##
## Unused values.  ##
## --------------- ##

AT_SETUP([Unused values])
AT_CHECK_UNUSED_VALUES
AT_CHECK_UNUSED_VALUES(, [1])
AT_CLEANUP


## ------------------------------------------ ##
## Unused values before symbol declarations.  ##
## ------------------------------------------ ##

AT_SETUP([Unused values before symbol declarations])
AT_CHECK_UNUSED_VALUES([1])
AT_CHECK_UNUSED_VALUES([1], [1])
AT_CLEANUP


## --------------------------------------------- ##
## Default %printer and %destructor redeclared.  ##
## --------------------------------------------- ##

AT_SETUP([Default %printer and %destructor redeclared])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <*> <*>
%printer { print ($$); } <*> <*>

%destructor { destroy ($$); } <*>
%printer { print ($$); } <*>

%destructor { destroy ($$); } <> <>
%printer { print ($$); } <> <>

%destructor { destroy ($$); } <>
%printer { print ($$); } <>

%%

start: ;

%destructor { destroy ($$); } <*>;
%printer { print ($$); } <*>;

%destructor { destroy ($$); } <>;
%printer { print ($$); } <>;
]])

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
]])

AT_CLEANUP


## ---------------------------------------------- ##
## Per-type %printer and %destructor redeclared.  ##
## ---------------------------------------------- ##

AT_SETUP([Per-type %printer and %destructor redeclared])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <field1> <field2>
%printer { print ($$); } <field1> <field2>

%destructor { destroy ($$); } <field1> <field1>
%printer { print ($$); } <field2> <field2>

%%

start: ;

%destructor { destroy ($$); } <field2> <field1>;
%printer { print ($$); } <field2> <field1>;
]])

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
]])

AT_CLEANUP

## ----------------------------------------------------- ##
## Undeclared symbols used for a printer or destructor.  ##
## ----------------------------------------------------- ##

AT_SETUP([Undeclared symbols used for a printer or destructor])

AT_DATA([[input.y]],
[[%printer {} foo baz
%destructor {} bar

%%
exp: bar;
]])

AT_BISON_CHECK([input.y], [1], [],
[[input.y:2.16-18: symbol bar is used, but is not defined as a token and has no rules
input.y:1.17-19: warning: symbol baz is used, but is not defined as a token and has no rules
input.y:1.13-15: warning: symbol foo is used, but is not defined as a token and has no rules
]])

AT_CLEANUP


## ----------------------------------------------------- ##
## Unassociated types used for a printer or destructor.  ##
## ----------------------------------------------------- ##

AT_SETUP([Unassociated types used for a printer or destructor])

AT_DATA([[input.y]],
[[%token <type1> tag1
%type <type2> tag2

%printer { } <type1> <type3>
%destructor { } <type2> <type4>

%%

exp: tag1 { $1; }
   | tag2 { $1; }

tag2: "a" { $$; }
]])

AT_BISON_CHECK([input.y], [0], [],
[[input.y:4.22-28: warning: type <type3> is used, but is not associated to any symbol
input.y:5.25-31: warning: type <type4> is used, but is not associated to any symbol
]])

AT_CLEANUP


## --------------------------------- ##
## Useless printers or destructors.  ##
## --------------------------------- ##

AT_SETUP([Useless printers or destructors])

AT_DATA([[input.y]],
[[%token <type1> token1
%token <type2> token2
%token <type3> token3
%token <type4> token4
%token <type5> token51 token52
%token <type6> token61 token62
%token <type7> token7

%printer {} token1
%destructor {} token2
%printer {} token51
%destructor {} token61

%printer {} token7

%printer {} <type1>
%destructor {} <type2>
%printer {} <type3>
%destructor {} <type4>

%printer {} <type5>
%destructor {} <type6>

%destructor {} <type7>

%%
exp: "a";
]])

AT_BISON_CHECK([input.y], [0], [],
[[input.y:16.13-19: warning: useless %printer for type <type1>
input.y:17.16-22: warning: useless %destructor for type <type2>
]])


AT_CLEANUP


## ---------------------------------------- ##
## Unused values with default %destructor.  ##
## ---------------------------------------- ##

AT_SETUP([Unused values with default %destructor])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <>
%type <tag> tagged

%%

start: end end tagged tagged { $<tag>1; $3; } ;
end: { } ;
tagged: { } ;
]])

AT_BISON_CHECK([input.y], [0], [],
[[input.y:6.8-45: warning: unset value: $$
input.y:6.8-45: warning: unused value: $2
input.y:7.6-8: warning: unset value: $$
]])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <*>
%type <tag> tagged

%%

start: end end tagged tagged { $<tag>1; $3; } ;
end: { } ;
tagged: { } ;
]])

AT_BISON_CHECK([input.y], [0], [],
[[input.y:6.8-45: warning: unused value: $4
input.y:8.9-11: warning: unset value: $$
]])

AT_CLEANUP


## ----------------------------------------- ##
## Unused values with per-type %destructor.  ##
## ----------------------------------------- ##

AT_SETUP([Unused values with per-type %destructor])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <field1>
%type <field1> start end

%%

start: end end { $1; } ;
end: { }  ;
]])

AT_BISON_CHECK([input.y], [0], [],
[[input.y:6.8-22: warning: unset value: $$
input.y:6.8-22: warning: unused value: $2
input.y:7.6-8: warning: unset value: $$
]])

AT_CLEANUP


## ---------------------- ##
## Incompatible Aliases.  ##
## ---------------------- ##

AT_SETUP([Incompatible Aliases])

AT_DATA([input.y],
[[%token foo "foo"

%type <bar>       foo
%printer {bar}    foo
%destructor {bar} foo
%left             foo

%type <baz>       "foo"
%printer {baz}    "foo"
%destructor {baz} "foo"
%left             "foo"

%%
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
]])

AT_CLEANUP



## ----------------------- ##
## Torturing the Scanner.  ##
## ----------------------- ##

# Be sure to compile and run, so that the C compiler checks what
# we do.

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
]])


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


AT_DATA_GRAMMAR([input.y],
[[%{
/* This is seen in GCC: a %{ and %} in middle of a comment. */
const char *foo = "So %{ and %} can be here too.";

#if 0
/* These examples test Bison while not stressing C compilers too much.
   Many C compilers mishandle backslash-newlines, so this part of the
   test is inside "#if 0".  The comment and string are written so that
   the "#endif" will be seen regardless of the C compiler bugs that we
   know about, namely:

     HP C (as of late 2002) mishandles *\[newline]\[newline]/ within a
     comment.

     The Apple Darwin compiler (as of late 2002) mishandles
     \\[newline]' within a character constant.

   */

/\
* A comment with backslash-newlines in it. %} *\
\
/
/* { Close the above comment, if the C compiler mishandled it.  */

char str[] = "\\
" A string with backslash-newlines in it %{ %} \\
\
"";

char apostrophe = '\'';
#endif

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

%{
/* Exercise pre-prologue dependency to %union.  */
typedef int value;
%}

/* Exercise M4 quoting: '@:>@@:>@', 0.  */

/* Also exercise %union. */
%union
{
  value ival; /* A comment to exercise an old bug. */
};


/* Exercise post-prologue dependency to %union.  */
%{
static YYSTYPE value_as_yystype (value val);

/* Exercise quotes in declarations.  */
char quote[] = "@:>@@:>@,";
%}

%{
]AT_YYERROR_DECLARE[
]AT_YYLEX_DECLARE[
%}

%type <ival> '@<:@'

/* Exercise quotes in strings.  */
%token FAKE "fake @<:@@:>@ \a\b\f\n\r\t\v\"\'\?\\\u005B\U0000005c ??!??'??(??)??-??/??<??=??> \x1\1"

%%
/* Exercise M4 quoting: '@:>@@:>@', @<:@, 1.  */
exp: '@<:@' '\1' two '$' '@' '{' oline output.or.oline.opt
  {
    /* Exercise quotes in braces.  */
    char tmp[] = "@<:@%c@:>@,\n";
    printf (tmp, $1);
  }
;

two: '\x000000000000000000000000000000000000000000000000000000000000000000002';
oline: '@' 'o' 'l' 'i' 'n' 'e' '@' '_' '_' 'o' 'l' 'i' 'n' 'e' '_' '_';
output.or.oline.opt: ;|oline;;|output;;;
output: '#' 'o' 'u' 't' 'p' 'u' 't' ' ';
%%
/* Exercise M4 quoting: '@:>@@:>@', @<:@, 2.  */

static YYSTYPE
value_as_yystype (value val)
{
  YYSTYPE res;
  res.ival = val;
  return res;
}
]AT_YYERROR_DEFINE[
static int
yylex (void)
{
  static char const input[] = "@<:@\1\2$@{@oline@__@&t@oline__\
#output "; /* "
  */
  static size_t toknum;
  if (! (toknum < sizeof input))
    abort ();
  yylval = value_as_yystype (input[toknum]);
  return input[toknum++];
}
]])

# Pacify Emacs'font-lock-mode: "

AT_DATA([main.c],
[[typedef int value;
#include "input.h"

int yyparse (void);

int
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], [input.o main.o])
AT_PARSER_CHECK([./input], 0,
[[[@<:@],
]])

AT_CLEANUP


## ---------------------- ##
## Typed symbol aliases.  ##
## ---------------------- ##

AT_SETUP([Typed symbol aliases])

# Bison 2.0 broke typed symbol aliases - ensure they work.

AT_DATA_GRAMMAR([input.y],
[[%union
{
  int val;
};
%token <val> MY_TOKEN "MY TOKEN"
%type <val> exp
%%
exp: "MY TOKEN";
%%
]])

AT_BISON_CHECK([-o input.c input.y])

AT_CLEANUP


## --------- ##
## Require.  ##
## --------- ##

m4_define([AT_CHECK_REQUIRE],
[AT_SETUP([Require $1])
AT_DATA_GRAMMAR([input.y],
[[%require "$1";
%%
empty_file:;
]])
AT_BISON_CHECK([-o input.c input.y], $2, [], ignore)
AT_CLEANUP
])

AT_CHECK_REQUIRE(1.0, 0)
AT_CHECK_REQUIRE(AT_PACKAGE_VERSION, 0)
## FIXME: Some day augment this version number.
AT_CHECK_REQUIRE(100.0, 63)


## ------------------------------------- ##
## String aliases for character tokens.  ##
## ------------------------------------- ##

AT_SETUP([String aliases for character tokens])

# Bison once thought a character token and its alias were different
# symbols with the same user token number.

AT_DATA_GRAMMAR([input.y],
[[%token 'a' "a"
%%
start: 'a';
%%
]])

AT_BISON_CHECK([-o input.c input.y])

AT_CLEANUP


## -------------- ##
## Symbol names.  ##
## -------------- ##

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 {
  ]AT_YYERROR_DECLARE[
  ]AT_YYLEX_DECLARE[
}
%%
start: with-dash without_dash with.period without_period;
with-dash: WITH-DASH;
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], [],
[[input.y:9.8-16: POSIX Yacc forbids dashes in symbol names: WITH-DASH
input.y:18.8-16: POSIX Yacc forbids dashes in symbol names: with-dash
]])

# So warn about them.
AT_BISON_CHECK([-Wyacc input.y], [], [],
[[input.y:9.8-16: warning: POSIX Yacc forbids dashes in symbol names: WITH-DASH
input.y:18.8-16: warning: POSIX Yacc forbids dashes in symbol names: with-dash
]])

# Dashes are fine for GNU Bison.
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])


# Periods are genuine letters, they can start identifiers.
# Digits and dashes cannot.
AT_DATA_GRAMMAR([input.y],
[[%token .GOOD
         -GOOD
         1NV4L1D
         -123
%%
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: '-'
]])

AT_CLEANUP


## ----------------- ##
## Numbered tokens.  ##
## ----------------- ##

AT_SETUP([Numbered tokens])

AT_DATA_GRAMMAR([redecl.y],
[[%token DECIMAL_1     11259375
         HEXADECIMAL_1 0xabcdef
         HEXADECIMAL_2 0xFEDCBA
         DECIMAL_2     16702650
%%
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
]])

AT_DATA_GRAMMAR([too-large.y],
[[%token TOO_LARGE_DEC 999999999999999999999
         TOO_LARGE_HEX 0xFFFFFFFFFFFFFFFFFFF
%%
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'
]])

AT_CLEANUP


## --------------------- ##
## Unclosed constructs.  ##
## --------------------- ##

AT_SETUP([Unclosed constructs])

# Bison's scan-gram.l once forgot to STRING_FINISH some unclosed
# constructs, so they were prepended to whatever it STRING_GROW'ed
# next.  It also threw them away rather than returning them to the
# parser.  The effect was confusing subsequent error messages.

AT_DATA([input.y],
[[%token A "a
%token B "b"
%token AB "ab" // Used to complain that "ab" was already used.
%token C '1
%token TWO "2"
%token TICK_TWELVE "'12" // Used to complain that "'12" was already used.

%%

start: ;

// Used to report a syntax error because it didn't see any kind of symbol
// identifier.
%type <f> 'a
;
%type <f> "a
;
// Used to report a syntax error because it didn't see braced code.
%destructor { free ($$)
]])

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
]])

AT_CLEANUP


## ------------------------- ##
## %start after first rule.  ##
## ------------------------- ##

AT_SETUP([%start after first rule])

# Bison once complained that a %start after the first rule was a
# redeclaration of the start symbol.

AT_DATA([input.y],
[[%%
false_start: ;
start: false_start ;
%start start;
]])

AT_BISON_CHECK([-o input.c input.y])

AT_CLEANUP


## --------------------- ##
## %prec takes a token.  ##
## --------------------- ##

AT_SETUP([%prec takes a token])

# Bison once allowed %prec sym where sym was a nonterminal.

AT_DATA([input.y],
[[%%
start: PREC %prec PREC ;
PREC: ;
]])

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

AT_CLEANUP


## ------------------------------- ##
## %prec's token must be defined.  ##
## ------------------------------- ##

AT_SETUP([[%prec's token must be defined]])

# According to POSIX, a %prec token must be defined separately.

AT_DATA([[input.y]],
[[%%
start: %prec PREC ;
]])

AT_BISON_CHECK([[input.y]], [[0]], [],
[[input.y:2.8-17: warning: token for %prec is not defined: PREC
]])

AT_CLEANUP


## -------------------------------- ##
## Reject unused %code qualifiers.  ##
## -------------------------------- ##

AT_SETUP([Reject unused %code qualifiers])

AT_DATA([input-c.y],
[[%code q {}
%code bad {}
%code bad {}
%code format {}
%%
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
]])

AT_DATA([input-c-glr.y],
[[%code q {}
%code bad {}
 %code bad {}
%%
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
]])

AT_DATA([input-c++.y],
[[%code q {}
%code bad {}
 %code q {}
%%
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
]])

AT_DATA([input-c++-glr.y],
[[%code bad {}
%code q {}
%code q {}
%%
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
]])

AT_DATA([special-char-@@.y],
[[%code bad {}
%code q {}
%code q {}
%%
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
]])

AT_DATA([special-char-@:>@.y],
[[%code bad {}
%code q {}
%code q {}
%%
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
]])

AT_CLEANUP


## ---------------- ##
## %define errors.  ##
## ---------------- ##

AT_SETUP([%define errors])

AT_DATA([input-redefined.y],
[[%define var "value1"
%define var "value1"
 %define var "value2"
%define special1 "@:>@"
%define special2 "@<:@"
%%
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
]])

AT_DATA([input-unused.y],
[[%define var "value"
%%
start: ;
]])

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

AT_CLEANUP


## ----------------------------------- ##
## %define, --define, --force-define.  ##
## ----------------------------------- ##

AT_SETUP([[%define, --define, --force-define]])

AT_DATA([[skel.c]],
[[m4@&t@_divert_push(0)@
@output(b4_parser_file_name@)@
[var-dd: ]b4_percent_define_get([[var-dd]])[
var-ff: ]b4_percent_define_get([[var-ff]])[
var-dfg: ]b4_percent_define_get([[var-dfg]])[
var-fd: ]b4_percent_define_get([[var-fd]])
m4@&t@_divert_pop(0)
]])
AT_DATA([[input.y]],
[[%define var-dfg "gram"
%%
start: ;
]])
AT_BISON_CHECK([[-Dvar-dd=cmd-d1 -Dvar-dd=cmd-d2 \
                 -Fvar-ff=cmd-f1 -Fvar-ff=cmd-f2 \
                 -Dvar-dfg=cmd-d -Fvar-dfg=cmd-f \
                 -Fvar-fd=cmd-f -Dvar-fd=cmd-d   \
                 --skeleton ./skel.c input.y]])
AT_CHECK([[cat input.tab.c]], [[0]],
[[var-dd: cmd-d2
var-ff: cmd-f2
var-dfg: cmd-f
var-fd: cmd-d
]])

AT_DATA([[input-dg.y]],
[[%define var "gram"
%%
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
]])

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
]])

AT_CLEANUP

## --------------------------- ##
## %define Boolean variables.  ##
## --------------------------- ##

AT_SETUP([[%define Boolean variables]])

AT_DATA([Input.y],
[[%language "Java"
%define public "maybe"
%define parser_class_name "Input"
%%
start: ;
]])

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

AT_CLEANUP

## ------------------------ ##
## %define enum variables.  ##
## ------------------------ ##

AT_SETUP([[%define enum variables]])

# Front-end.
AT_DATA([[input.y]],
[[%define lr.default-reductions bogus
%%
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'
]])

# Back-end.
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'
]])

AT_CLEANUP

## -------------------------------- ##
## %define backward compatibility.  ##
## -------------------------------- ##

AT_SETUP([[%define backward compatibility]])

# The error messages tell us whether underscores in these variables are
# being converted to dashes.

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'
]])

AT_DATA([[input.y]],
[[%define lr.keep_unreachable_states maybe
%%
start: ;
]])
AT_BISON_CHECK([[input.y]], [1], [],
[[input.y:1.9-34: invalid value for %define Boolean variable 'lr.keep-unreachable-states'
]])

AT_DATA([[input.y]],
[[%define namespace "foo"
%define api.namespace "foo"
%%
start: ;
]])
AT_BISON_CHECK([[input.y]], [1], [],
[[input.y:2.9-21: %define variable 'api.namespace' redefined
input.y:1.9-17: previous definition
]])

AT_DATA([[input.y]],
[[%define foo_bar "baz"
%%
start: ;
]])
AT_BISON_CHECK([[input.y]], [[1]], [],
[[input.y:1.9-15: %define variable 'foo_bar' is not used
]])

AT_CLEANUP

## ------------------------- ##
## Unused %define api.pure.  ##
## ------------------------- ##

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
# are specified.
m4_define([AT_CHECK_API_PURE],
[
AT_DATA([[input.y]],
[[%define api.pure ]$2[
]$1[
%%
start: ;
]])

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

AT_CHECK_API_PURE([[%language "c++" %defines]], [[]])
AT_CHECK_API_PURE([[%language "c++" %defines]], [[false]])
AT_CHECK_API_PURE([[%language "c++" %defines %glr-parser]], [[""]])
AT_CHECK_API_PURE([[%language "c++" %defines %glr-parser]], [[false]])
AT_CHECK_API_PURE([[%language "java"]], [[true]])
AT_CHECK_API_PURE([[%language "java"]], [[false]])

AT_CLEANUP

## -------------------------------- ##
## C++ namespace reference errors.  ##
## -------------------------------- ##

AT_SETUP([[C++ namespace reference errors]])

# AT_CHECK_NAMESPACE_ERROR(NAMESPACE-DECL, ERROR, [ERROR], ...)
# -------------------------------------------------------------
# Make sure Bison reports all ERROR's for %define namespace "NAMESPACE-DECL".
m4_define([AT_CHECK_NAMESPACE_ERROR],
[
AT_DATA([[input.y]],
[[%language "C++"
%defines
%define api.namespace "]$1["
%%
start: ;
]])

AT_BISON_CHECK([[input.y]], [1], [],
[m4_foreach([b4_arg], m4_dquote(m4_shift($@)),
[[input.y:3.9-21: ]b4_arg[
]])])
])

AT_CHECK_NAMESPACE_ERROR([[]],
                         [[namespace reference is empty]])
AT_CHECK_NAMESPACE_ERROR([[ 		  	 	]],
                         [[namespace reference is empty]])
AT_CHECK_NAMESPACE_ERROR([[foo::::bar]],
                         [[namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo:: 	::bar]],
                         [[namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[::::bar]],
                         [[namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[:: ::bar]],
                         [[namespace reference has consecutive "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo::bar::	::]],
                         [[namespace reference has consecutive "::"]],
                         [[namespace reference has a trailing "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo::bar::]],
                         [[namespace reference has a trailing "::"]])
AT_CHECK_NAMESPACE_ERROR([[foo::bar:: 	]],
                         [[namespace reference has a trailing "::"]])
AT_CHECK_NAMESPACE_ERROR([[::]],
                         [[namespace reference has a trailing "::"]])

AT_CLEANUP

## ------------------------ ##
## Bad character literals.  ##
## ------------------------ ##

# Bison used to accept character literals that were empty or contained
# too many characters.

# FIXME: AT_DATA or some variant of AT_DATA may eventually permit
# the final newline to be omitted.  See the threads starting at
# <http://lists.gnu.org/archive/html/bison-patches/2009-07/msg00019.html>.

AT_SETUP([[Bad character literals]])

AT_DATA([empty.y],
[[%%
start: '';
start: '
]])
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:4.8: warning: empty character literal
empty.y:4.8: missing "'" at end of file
]])

AT_DATA([two.y],
[[%%
start: 'ab';
start: 'ab
]])
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:4.8-10: warning: extra characters in character literal
two.y:4.8-10: missing "'" at end of file
]])

AT_DATA([three.y],
[[%%
start: 'abc';
start: 'abc
]])
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:4.8-11: warning: extra characters in character literal
three.y:4.8-11: missing "'" at end of file
]])

AT_CLEANUP

## ------------------------- ##
## Bad escapes in literals.  ##
## ------------------------- ##

AT_SETUP([[Bad escapes in literals]])

AT_DATA([input.y],
[[%%
start: '\777' '\0' '\xfff' '\x0'
       '\uffff' '\u0000' '\Uffffffff' '\U00000000'
       '\ ' '\A';
]])

# It is not easy to create special characters, we cannot even trust tr.
# 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 \
           || exit 77]])

AT_BISON_CHECK([input.y], [1], [],
[[input.y:2.9-12: 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:2.15-18: warning: empty character literal
input.y:2.21-25: 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:2.28-32: warning: empty character literal
input.y:3.9-14: 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:3.17-24: warning: empty character literal
input.y:3.27-36: 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:3.39-50: warning: empty character literal
input.y:4.9-10: 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:4.13-16: 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
]])

AT_CLEANUP

## ------------------------- ##
## LAC: Errors for %define.  ##
## ------------------------- ##

AT_SETUP([[LAC: Errors for %define]])

AT_DATA([[input.y]],
[[%%
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
]])
AT_BISON_CHECK([[-Dparse.lac.memory-trace=full input.y]],
               [[1]], [],
[[<command line>:2: %define variable 'parse.lac.memory-trace' is not used
]])

AT_CLEANUP

## --------------------------------------------- ##
## -Werror is not affected by -Wnone and -Wall.  ##
## --------------------------------------------- ##

AT_SETUP([[-Werror is not affected by -Wnone and -Wall]])

AT_DATA([[input.y]],
[[%%
foo-bar: ;
]])

# -Werror is not enabled by -Wall or equivalent.
AT_BISON_CHECK([[-Wall input.y]], [[0]], [[]],
[[input.y:2.1-7: warning: POSIX Yacc forbids dashes in symbol names: foo-bar
]])
AT_BISON_CHECK([[-W input.y]], [[0]], [[]],
[[input.y:2.1-7: warning: POSIX Yacc forbids dashes in symbol names: foo-bar
]])
AT_BISON_CHECK([[-Wno-none input.y]], [[0]], [[]],
[[input.y:2.1-7: warning: POSIX Yacc forbids dashes in symbol names: foo-bar
]])

# -Werror is not disabled by -Wnone or equivalent.
AT_BISON_CHECK([[-Werror,none,yacc input.y]], [[1]], [[]], [[stderr]])
AT_CHECK([[sed 's/^.*bison:/bison:/' stderr]], [[0]],
[[bison: warnings being treated as errors
input.y:2.1-7: warning: POSIX Yacc forbids dashes in symbol names: foo-bar
]])
[mv stderr experr]
AT_BISON_CHECK([[-Werror,no-all,yacc input.y]], [[1]], [[]], [[experr]])

AT_CLEANUP