tests/input.at

   1 # Checking the Bison scanner.                    -*- Autotest -*-
   2 # Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
   3
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 2, or (at your option)
   7 # any later version.
   8
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program; if not, write to the Free Software
  16 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17 # 02110-1301, USA.
  18
  19 AT_BANNER([[Input Processing.]])
  20
  21 # Mostly test that we are robust to mistakes.
  22
  23
  24 ## ------------ ##
  25 ## Invalid $n.  ##
  26 ## ------------ ##
  27
  28 AT_SETUP([Invalid \$n and @n])
  29
  30 AT_DATA([input.y],
  31 [[%%
  32 exp: { $$ = $1 ; };
  33 exp: { @$ = @1 ; };
  34 ]])
  35
  36 AT_CHECK([bison input.y], [1], [],
  37 [[input.y:2.13-14: integer out of range: `$1'
  38 input.y:3.13-14: integer out of range: `@1'
  39 ]])
  40
  41 AT_CLEANUP
  42
  43
  44 ## -------------- ##
  45 ## Type Clashes.  ##
  46 ## -------------- ##
  47
  48 AT_SETUP([Type Clashes])
  49
  50 AT_DATA([input.y],
  51 [[%union { int bar; }
  52 %token foo
  53 %type <bar> exp
  54 %%
  55 exp: foo { $$; } foo { $2; } foo
  56    | foo
  57    | /* Empty. */
  58    ;
  59 ]])
  60
  61 AT_CHECK([bison input.y], [1], [],
  62 [[input.y:5.12-13: $$ for the midrule at $2 of `exp' has no declared type
  63 input.y:5.24-25: $2 of `exp' has no declared type
  64 input.y:5.6-32: warning: type clash on default action: <bar> != <>
  65 input.y:6.6-8: warning: type clash on default action: <bar> != <>
  66 input.y:7.5: warning: empty rule for typed nonterminal, and no action
  67 ]])
  68
  69 AT_CLEANUP
  70
  71
  72 # _AT_UNUSED_VALUES_DECLARATIONS()
  73 # --------------------------------------------
  74 # Generate the token, type, and destructor
  75 # declarations for the unused values tests.
  76
  77 m4_define([_AT_UNUSED_VALUES_DECLARATIONS],
  78 [[[%token <integer> INT;
  79 %type <integer> a b c d e f g h i j k l;
  80 %destructor { destroy ($$); } INT a b c d e f g h i j k l;]]])
  81
  82
  83 # AT_CHECK_UNUSED_VALUES(DECLARATIONS_AFTER, CHECK_MIDRULE_VALUES)
  84 # ------------------------------------------------------------------
  85 # Generate a grammar to test unused values,
  86 # compile it, run it.  If DECLARATIONS_AFTER
  87 # is set, then the token, type, and destructor
  88 # declarations are generated after the rules
  89 # rather than before.  If CHECK_MIDRULE_VALUES
  90 # is set, then --warnings=midrule-values is
  91 # set.
  92
  93 m4_define([AT_CHECK_UNUSED_VALUES],
  94 [AT_DATA([input.y],
  95 m4_ifval($1, [
  96
  97
  98 ], [_AT_UNUSED_VALUES_DECLARATIONS
  99 ])[[%%
 100 start:
 101   'a' a { $]2[ } | 'b' b { $]2[ } | 'c' c { $]2[ } | 'd' d { $]2[ } | 'e' e { $]2[ }
 102 | 'f' f { $]2[ } | 'g' g { $]2[ } | 'h' h { $]2[ } | 'i' i { $]2[ } | 'j' j { $]2[ }
 103 | 'k' k { $]2[ } | 'l' l { $]2[ }
 104 ;
 105
 106 a: INT | INT { } INT { } INT { };
 107 b: INT | /* empty */;
 108 c: INT | INT { $]1[ } INT { $<integer>2 } INT { $<integer>4 };
 109 d: INT | INT { } INT { $]1[ } INT { $<integer>2 };
 110 e: INT | INT { } INT {  } INT { $]1[ };
 111 f: INT | INT { } INT {  } INT { $]$[ = $]1[ + $]3[ + $]5[; };
 112 g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
 113 h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
 114 i: INT | INT INT { } { $]$[ = $]1[ + $]2[; };
 115 j: INT | INT INT { $<integer>$ = 1; } { $]$[ = $]1[ + $]2[; };
 116 k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
 117 l: INT | INT { $<integer>$ = $<integer>1; } INT { $<integer>$ = $<integer>2 + $<integer>3; } INT { $<integer>$ = $<integer>4 + $<integer>5; };]]m4_ifval($1, [
 118 _AT_UNUSED_VALUES_DECLARATIONS])
 119 )
 120
 121 AT_CHECK([bison]m4_ifval($2, [ --warnings=midrule-values ])[ input.y], [0], [],
 122 [[input.y:11.10-32: warning: unset value: $]$[
 123 input.y:11.10-32: warning: unused value: $]1[
 124 input.y:11.10-32: warning: unused value: $]3[
 125 input.y:11.10-32: warning: unused value: $]5[
 126 input.y:12.9: warning: empty rule for typed nonterminal, and no action
 127 ]]m4_ifval($2, [[[input.y:13.14-19: warning: unset value: $$
 128 input.y:13.25-39: warning: unset value: $$
 129 ]]])[[input.y:13.10-59: warning: unset value: $]$[
 130 input.y:13.10-59: warning: unused value: $]3[
 131 input.y:13.10-59: warning: unused value: $]5[
 132 ]]m4_ifval($2, [[[input.y:14.14-16: warning: unset value: $$
 133 ]]])[[input.y:14.10-47: warning: unset value: $]$[
 134 input.y:14.10-47: warning: unused value: $]3[
 135 input.y:14.10-47: warning: unused value: $]5[
 136 input.y:15.10-36: warning: unset value: $]$[
 137 input.y:15.10-36: warning: unused value: $]3[
 138 input.y:15.10-36: warning: unused value: $]5[
 139 input.y:17.10-58: warning: unset value: $]$[
 140 input.y:17.10-58: warning: unused value: $]1[
 141 ]]m4_ifval($2, [[[input.y:17.10-58: warning: unused value: $]2[
 142 ]]])[[input.y:17.10-58: warning: unused value: $]3[
 143 ]]m4_ifval($2, [[[input.y:17.10-58: warning: unused value: $]4[
 144 ]]])[[input.y:17.10-58: warning: unused value: $]5[
 145 input.y:18.10-72: warning: unset value: $]$[
 146 input.y:18.10-72: warning: unused value: $]1[
 147 input.y:18.10-72: warning: unused value: $]3[
 148 ]]m4_ifval($2, [[[input.y:18.10-72: warning: unused value: $]4[
 149 ]]])[[input.y:18.10-72: warning: unused value: $]5[
 150 ]]m4_ifval($2, [[[input.y:20.10-55: warning: unused value: $]3[
 151 ]]])[[input.y:21.10-68: warning: unset value: $]$[
 152 input.y:21.10-68: warning: unused value: $]1[
 153 input.y:21.10-68: warning: unused value: $]2[
 154 ]]m4_ifval($2, [[[input.y:21.10-68: warning: unused value: $]4[
 155 ]]]))])
 156
 157
 158 ## --------------- ##
 159 ## Unused values.  ##
 160 ## --------------- ##
 161
 162 AT_SETUP([Unused values])
 163 AT_CHECK_UNUSED_VALUES
 164 AT_CHECK_UNUSED_VALUES(, [1])
 165 AT_CLEANUP
 166
 167
 168 ## ------------------------------------------ ##
 169 ## Unused values before symbol declarations.  ##
 170 ## ------------------------------------------ ##
 171
 172 AT_SETUP([Unused values before symbol declarations])
 173 AT_CHECK_UNUSED_VALUES([1])
 174 AT_CHECK_UNUSED_VALUES([1], [1])
 175 AT_CLEANUP
 176
 177
 178 ## --------------------------------------------- ##
 179 ## Default %printer and %destructor redeclared.  ##
 180 ## --------------------------------------------- ##
 181
 182 AT_SETUP([Default %printer and %destructor redeclared])
 183
 184 AT_DATA([[input.y]],
 185 [[%destructor { destroy ($$); } <*> <*>
 186 %printer { destroy ($$); } <*> <*>
 187
 188 %destructor { destroy ($$); } <*>
 189 %printer { destroy ($$); } <*>
 190
 191 %destructor { destroy ($$); } <!> <!>
 192 %printer { destroy ($$); } <!> <!>
 193
 194 %destructor { destroy ($$); } <!>
 195 %printer { destroy ($$); } <!>
 196
 197 %%
 198
 199 start: ;
 200
 201 %destructor { destroy ($$); } <*>;
 202 %printer { destroy ($$); } <*>;
 203
 204 %destructor { destroy ($$); } <!>;
 205 %printer { destroy ($$); } <!>;
 206 ]])
 207
 208 AT_CHECK([bison input.y], [1], [],
 209 [[input.y:1.13-29: redeclaration for default tagged %destructor
 210 input.y:1.13-29: previous declaration
 211 input.y:2.10-26: redeclaration for default tagged %printer
 212 input.y:2.10-26: previous declaration
 213 input.y:4.13-29: redeclaration for default tagged %destructor
 214 input.y:1.13-29: previous declaration
 215 input.y:5.10-26: redeclaration for default tagged %printer
 216 input.y:2.10-26: previous declaration
 217 input.y:7.13-29: redeclaration for default tagless %destructor
 218 input.y:7.13-29: previous declaration
 219 input.y:8.10-26: redeclaration for default tagless %printer
 220 input.y:8.10-26: previous declaration
 221 input.y:10.13-29: redeclaration for default tagless %destructor
 222 input.y:7.13-29: previous declaration
 223 input.y:11.10-26: redeclaration for default tagless %printer
 224 input.y:8.10-26: previous declaration
 225 input.y:17.13-29: redeclaration for default tagged %destructor
 226 input.y:4.13-29: previous declaration
 227 input.y:18.10-26: redeclaration for default tagged %printer
 228 input.y:5.10-26: previous declaration
 229 input.y:20.13-29: redeclaration for default tagless %destructor
 230 input.y:10.13-29: previous declaration
 231 input.y:21.10-26: redeclaration for default tagless %printer
 232 input.y:11.10-26: previous declaration
 233 ]])
 234
 235 AT_CLEANUP
 236
 237
 238 ## ---------------------------------------------- ##
 239 ## Per-type %printer and %destructor redeclared.  ##
 240 ## ---------------------------------------------- ##
 241
 242 AT_SETUP([Per-type %printer and %destructor redeclared])
 243
 244 AT_DATA([[input.y]],
 245 [[%destructor { destroy ($$); } <field1> <field2>
 246 %printer { destroy ($$); } <field1> <field2>
 247
 248 %destructor { destroy ($$); } <field1> <field1>
 249 %printer { destroy ($$); } <field2> <field2>
 250
 251 %%
 252
 253 start: ;
 254
 255 %destructor { destroy ($$); } <field2> <field1>;
 256 %printer { destroy ($$); } <field2> <field1>;
 257 ]])
 258
 259 AT_CHECK([bison input.y], [1], [],
 260 [[input.y:4.13-29: %destructor redeclaration for <field1>
 261 input.y:1.13-29: previous declaration
 262 input.y:4.13-29: %destructor redeclaration for <field1>
 263 input.y:4.13-29: previous declaration
 264 input.y:5.10-26: %printer redeclaration for <field2>
 265 input.y:2.10-26: previous declaration
 266 input.y:5.10-26: %printer redeclaration for <field2>
 267 input.y:5.10-26: previous declaration
 268 input.y:11.13-29: %destructor redeclaration for <field1>
 269 input.y:4.13-29: previous declaration
 270 input.y:11.13-29: %destructor redeclaration for <field2>
 271 input.y:1.13-29: previous declaration
 272 input.y:12.10-26: %printer redeclaration for <field1>
 273 input.y:2.10-26: previous declaration
 274 input.y:12.10-26: %printer redeclaration for <field2>
 275 input.y:5.10-26: previous declaration
 276 ]])
 277
 278 AT_CLEANUP
 279
 280
 281 ## ---------------------------------------- ##
 282 ## Unused values with default %destructor.  ##
 283 ## ---------------------------------------- ##
 284
 285 AT_SETUP([Unused values with default %destructor])
 286
 287 AT_DATA([[input.y]],
 288 [[%destructor { destroy ($$); } <!>
 289 %type <tag> tagged
 290
 291 %%
 292
 293 start: end end tagged tagged { $<tag>1; $3; } ;
 294 end: { } ;
 295 tagged: { } ;
 296 ]])
 297
 298 AT_CHECK([bison input.y], [0], [],
 299 [[input.y:6.8-45: warning: unset value: $$
 300 input.y:6.8-45: warning: unused value: $2
 301 input.y:7.6-8: warning: unset value: $$
 302 ]])
 303
 304 AT_DATA([[input.y]],
 305 [[%destructor { destroy ($$); } <*>
 306 %type <tag> tagged
 307
 308 %%
 309
 310 start: end end tagged tagged { $<tag>1; $3; } ;
 311 end: { } ;
 312 tagged: { } ;
 313 ]])
 314
 315 AT_CHECK([bison input.y], [0], [],
 316 [[input.y:6.8-45: warning: unused value: $4
 317 input.y:8.9-11: warning: unset value: $$
 318 ]])
 319
 320 AT_CLEANUP
 321
 322
 323 ## ----------------------------------------- ##
 324 ## Unused values with per-type %destructor.  ##
 325 ## ----------------------------------------- ##
 326
 327 AT_SETUP([Unused values with per-type %destructor])
 328
 329 AT_DATA([[input.y]],
 330 [[%destructor { destroy ($$); } <field1>
 331 %type <field1> start end
 332
 333 %%
 334
 335 start: end end { $1; } ;
 336 end: { }  ;
 337 ]])
 338
 339 AT_CHECK([bison input.y], [0], [],
 340 [[input.y:6.8-22: warning: unset value: $$
 341 input.y:6.8-22: warning: unused value: $2
 342 input.y:7.6-8: warning: unset value: $$
 343 ]])
 344
 345 AT_CLEANUP
 346
 347
 348 ## ---------------------- ##
 349 ## Incompatible Aliases.  ##
 350 ## ---------------------- ##
 351
 352 AT_SETUP([Incompatible Aliases])
 353
 354 AT_DATA([input.y],
 355 [[%token foo "foo"
 356
 357 %type <bar>       foo
 358 %printer {bar}    foo
 359 %destructor {bar} foo
 360 %left             foo
 361
 362 %type <baz>       "foo"
 363 %printer {baz}    "foo"
 364 %destructor {baz} "foo"
 365 %left             "foo"
 366
 367 %%
 368 exp: foo;
 369 ]])
 370
 371 AT_CHECK([bison input.y], [1], [],
 372 [[input.y:8.7-11: %type redeclaration for foo
 373 input.y:3.7-11: previous declaration
 374 input.y:10.13-17: %destructor redeclaration for foo
 375 input.y:5.13-17: previous declaration
 376 input.y:9.10-14: %printer redeclaration for foo
 377 input.y:4.10-14: previous declaration
 378 input.y:11.1-5: %left redeclaration for foo
 379 input.y:6.1-5: previous declaration
 380 ]])
 381
 382 AT_CLEANUP
 383
 384
 385
 386 ## ----------------------- ##
 387 ## Torturing the Scanner.  ##
 388 ## ----------------------- ##
 389
 390 # Be sure to compile and run, so that the C compiler checks what
 391 # we do.
 392
 393 AT_SETUP([Torturing the Scanner])
 394
 395
 396 AT_DATA([input.y], [])
 397 AT_CHECK([bison input.y], [1], [],
 398 [[input.y:1.1: syntax error, unexpected end of file
 399 ]])
 400
 401
 402 AT_DATA([input.y],
 403 [{}
 404 ])
 405 AT_CHECK([bison input.y], [1], [],
 406 [[input.y:1.1-2: syntax error, unexpected {...}
 407 ]])
 408
 409
 410 AT_DATA_GRAMMAR([input.y],
 411 [[%{
 412 /* This is seen in GCC: a %{ and %} in middle of a comment. */
 413 const char *foo = "So %{ and %} can be here too.";
 414
 415 #if 0
 416 /* These examples test Bison while not stressing C compilers too much.
 417    Many C compilers mishandle backslash-newlines, so this part of the
 418    test is inside "#if 0".  The comment and string are written so that
 419    the "#endif" will be seen regardless of the C compiler bugs that we
 420    know about, namely:
 421
 422      HP C (as of late 2002) mishandles *\[newline]\[newline]/ within a
 423      comment.
 424
 425      The Apple Darwin compiler (as of late 2002) mishandles
 426      \\[newline]' within a character constant.
 427
 428    */
 429
 430 /\
 431 * A comment with backslash-newlines in it. %} *\
 432 \
 433 /
 434 /* { Close the above comment, if the C compiler mishandled it.  */
 435
 436 char str[] = "\\
 437 " A string with backslash-newlines in it %{ %} \\
 438 \
 439 "";
 440
 441 char apostrophe = '\'';
 442 #endif
 443
 444 #include <stdio.h>
 445 #include <stdlib.h>
 446 %}
 447 /* %{ and %} can be here too. */
 448
 449 %{
 450 /* Exercise pre-prologue dependency to %union.  */
 451 typedef int value;
 452 %}
 453
 454 /* Exercise M4 quoting: '@:>@@:>@', 0.  */
 455
 456 /* Also exercise %union. */
 457 %union
 458 {
 459   value ival; /* A comment to exercise an old bug. */
 460 };
 461
 462
 463 /* Exercise post-prologue dependency to %union.  */
 464 %{
 465 static YYSTYPE value_as_yystype (value val);
 466
 467 /* Exercise quotes in declarations.  */
 468 char quote[] = "@:>@@:>@,";
 469 %}
 470
 471 %{
 472 static void yyerror (const char *s);
 473 static int yylex (void);
 474 %}
 475
 476 %type <ival> '@<:@'
 477
 478 /* Exercise quotes in strings.  */
 479 %token FAKE "fake @<:@@:>@ \a\b\f\n\r\t\v\"\'\?\\\u005B\U0000005c ??!??'??(??)??-??/??<??=??> \x1\1"
 480
 481 %%
 482 /* Exercise M4 quoting: '@:>@@:>@', @<:@, 1.  */
 483 exp: '@<:@' '\1' two '$' '@' '{' oline output.or.oline.opt
 484   {
 485     /* Exercise quotes in braces.  */
 486     char tmp[] = "@<:@%c@:>@,\n";
 487     printf (tmp, $1);
 488   }
 489 ;
 490
 491 two: '\x000000000000000000000000000000000000000000000000000000000000000000002';
 492 oline: '@' 'o' 'l' 'i' 'n' 'e' '@' '_' '_' 'o' 'l' 'i' 'n' 'e' '_' '_';
 493 output.or.oline.opt: ;|oline;;|output;;;
 494 output: '#' 'o' 'u' 't' 'p' 'u' 't' ' ';
 495 %%
 496 /* Exercise M4 quoting: '@:>@@:>@', @<:@, 2.  */
 497
 498 static YYSTYPE
 499 value_as_yystype (value val)
 500 {
 501   YYSTYPE res;
 502   res.ival = val;
 503   return res;
 504 }
 505
 506 static int
 507 yylex (void)
 508 {
 509   static char const input[] = "@<:@\1\2$@{@oline@__@&t@oline__\
 510 #output "; /* "
 511   */
 512   static size_t toknum;
 513   if (! (toknum < sizeof input))
 514     abort ();
 515   yylval = value_as_yystype (input[toknum]);
 516   return input[toknum++];
 517 }
 518
 519 static void
 520 yyerror (const char *msg)
 521 {
 522   fprintf (stderr, "%s\n", msg);
 523 }
 524 ]])
 525
 526 # Pacify Emacs'font-lock-mode: "
 527
 528 AT_DATA([main.c],
 529 [[typedef int value;
 530 #include "input.h"
 531
 532 int yyparse (void);
 533
 534 int
 535 main (void)
 536 {
 537   return yyparse ();
 538 }
 539 ]])
 540
 541 AT_CHECK([bison -d -v -o input.c input.y])
 542 AT_COMPILE([input.o], [-c input.c])
 543 AT_COMPILE([main.o], [-c main.c])
 544 AT_COMPILE([input], [input.o main.o])
 545 AT_PARSER_CHECK([./input], 0,
 546 [[[@<:@],
 547 ]])
 548
 549 AT_CLEANUP
 550
 551
 552 ## ---------------------- ##
 553 ## Typed symbol aliases.  ##
 554 ## ---------------------- ##
 555
 556 AT_SETUP([Typed symbol aliases])
 557
 558 # Bison 2.0 broke typed symbol aliases - ensure they work.
 559
 560 AT_DATA_GRAMMAR([input.y],
 561 [[%union
 562 {
 563   int val;
 564 };
 565 %token <val> MY_TOKEN "MY TOKEN"
 566 %type <val> exp
 567 %%
 568 exp: "MY TOKEN";
 569 %%
 570 ]])
 571
 572 AT_CHECK([bison -o input.c input.y])
 573
 574 AT_CLEANUP
 575
 576
 577 ## --------- ##
 578 ## Require.  ##
 579 ## --------- ##
 580
 581 m4_define([AT_CHECK_REQUIRE],
 582 [AT_SETUP([Require $1])
 583 AT_DATA_GRAMMAR([input.y],
 584 [[%require "$1";
 585 %%
 586 empty_file:;
 587 ]])
 588 AT_CHECK([bison -o input.c input.y], $2, [], ignore)
 589 AT_CLEANUP
 590 ])
 591
 592 AT_CHECK_REQUIRE(1.0, 0)
 593 AT_CHECK_REQUIRE(AT_PACKAGE_VERSION, 0)
 594 ## FIXME: Some day augment this version number.
 595 AT_CHECK_REQUIRE(100.0, 63)
 596
 597
 598 ## ------------------------------------- ##
 599 ## String aliases for character tokens.  ##
 600 ## ------------------------------------- ##
 601
 602 AT_SETUP([String aliases for character tokens])
 603
 604 # Bison once thought a character token and its alias were different symbols
 605 # with the same user token number.
 606
 607 AT_DATA_GRAMMAR([input.y],
 608 [[%token 'a' "a"
 609 %%
 610 start: 'a';
 611 %%
 612 ]])
 613
 614 AT_CHECK([bison -o input.c input.y])
 615
 616 AT_CLEANUP
 617
 618
 619 ## --------------------- ##
 620 ## Unclosed constructs.  ##
 621 ## --------------------- ##
 622
 623 AT_SETUP([Unclosed constructs])
 624
 625 # Bison's scan-gram.l once forgot to STRING_FINISH some unclosed constructs, so
 626 # they were prepended to whatever it STRING_GROW'ed next.  It also threw them
 627 # away rather than returning them to the parser.  The effect was confusing
 628 # subsequent error messages.
 629
 630 AT_DATA([input.y],
 631 [[%token A "a
 632 %token B "b"
 633 %token AB "ab" // Used to complain that "ab" was already used.
 634 %token C '1
 635 %token TWO "2"
 636 %token TICK_TWELVE "'12" // Used to complain that "'12" was already used.
 637
 638 %%
 639
 640 start: ;
 641
 642 // Used to report a syntax error because it didn't see any kind of symbol
 643 // identifier.
 644 %type <f> 'a
 645 ;
 646 %type <f> "a
 647 ;
 648 // Used to report a syntax error because it didn't see braced code.
 649 %destructor { free ($$)
 650 ]])
 651
 652 AT_CHECK([bison -o input.c input.y], 1, [],
 653 [[input.y:1.10-2.0: missing `"' at end of line
 654 input.y:4.10-5.0: missing `'' at end of line
 655 input.y:14.11-15.0: missing `'' at end of line
 656 input.y:16.11-17.0: missing `"' at end of line
 657 input.y:19.13-20.0: missing `}' at end of file
 658 input.y:20.1: syntax error, unexpected end of file
 659 ]])
 660
 661 AT_CLEANUP
 662
 663
 664 ## ------------------------- ##
 665 ## %start after first rule.  ##
 666 ## ------------------------- ##
 667
 668 AT_SETUP([%start after first rule])
 669
 670 # Bison once complained that a %start after the first rule was a redeclaration
 671 # of the start symbol.
 672
 673 AT_DATA([input.y],
 674 [[%%
 675 false_start: ;
 676 start: false_start ;
 677 %start start;
 678 ]])
 679
 680 AT_CHECK([bison -o input.c input.y])
 681
 682 AT_CLEANUP
 683
 684
 685 ## --------------------- ##
 686 ## %prec takes a token.  ##
 687 ## --------------------- ##
 688
 689 AT_SETUP([%prec takes a token])
 690
 691 # Bison once allowed %prec sym where sym was a nonterminal.
 692
 693 AT_DATA([input.y],
 694 [[%%
 695 start: PREC %prec PREC ;
 696 PREC: ;
 697 ]])
 698
 699 AT_CHECK([bison input.y], [1], [],
 700 [[input.y:3.1-4: rule given for PREC, which is a token
 701 ]])
 702
 703 AT_CLEANUP