X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/231ed89af1eaff303a22f72aeb1c2c0cf5e25c21..62243aa576e1d8f465f3a6790ac71d74cde051f1:/tests/glr-regression.at diff --git a/tests/glr-regression.at b/tests/glr-regression.at index 9a0f01c0..bc32c901 100644 --- a/tests/glr-regression.at +++ b/tests/glr-regression.at @@ -1,20 +1,20 @@ # Checking GLR Parsing: Regression Tests -*- Autotest -*- -# Copyright (C) 2002, 2003, 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) 2002-2003, 2005-2007, 2009-2012 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, write to the Free Software -# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -# 02110-1301, USA. +# along with this program. If not, see . AT_BANNER([[GLR Regression Tests]]) @@ -85,21 +85,21 @@ yylex (void) { int ch; if (feof (stdin)) - abort (); + abort (); ch = getchar (); if (ch == EOF) - return 0; + return 0; else if (ch == 'B' || ch == 'P') - return ch; + return ch; } } ]]) -AT_CHECK([[bison -o glr-regr1.c glr-regr1.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr1.c glr-regr1.y]], 0, [], [glr-regr1.y: conflicts: 1 shift/reduce ]) AT_COMPILE([glr-regr1]) -AT_CHECK([[echo BPBPB | ./glr-regr1]], 0, +AT_PARSER_CHECK([[echo BPBPB | ./glr-regr1]], 0, [[E -> 'B' E -> 'B' E -> E 'P' E @@ -213,18 +213,19 @@ main (int argc, char **argv) } ]]) -AT_CHECK([[bison -o glr-regr2a.c glr-regr2a.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr2a.c glr-regr2a.y]], 0, [], [glr-regr2a.y: conflicts: 2 shift/reduce ]) AT_COMPILE([glr-regr2a]) -AT_CHECK([[echo s VARIABLE_1 t v x q | ./glr-regr2a]], 0, +AT_PARSER_CHECK([[echo s VARIABLE_1 t v x q | ./glr-regr2a]], 0, [[Variable: 'VARIABLE_1' ]], []) -AT_CHECK([[echo s VARIABLE_1 , ANOTHER_VARIABLE_2 t e | ./glr-regr2a]], 0, +AT_PARSER_CHECK([[echo s VARIABLE_1 , ANOTHER_VARIABLE_2 t e | ./glr-regr2a]], +0, [[Varlist: 'VARIABLE_1,ANOTHER_VARIABLE_2' ]]) -AT_CHECK([[echo s VARIABLE_3 t v x | ./glr-regr2a]], 0, +AT_PARSER_CHECK([[echo s VARIABLE_3 t v x | ./glr-regr2a]], 0, [[Variable: 'VARIABLE_3' ]], []) @@ -326,12 +327,13 @@ int main(int argc, char* argv[]) { } ]]) -AT_CHECK([[bison -o glr-regr3.c glr-regr3.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr3.c glr-regr3.y]], 0, [], [glr-regr3.y: conflicts: 1 shift/reduce, 1 reduce/reduce ]) AT_COMPILE([glr-regr3]) -AT_CHECK([[echo p1 t4 o2 p1 p1 t1 o1 t2 p2 o1 t3 p2 p2 | ./glr-regr3]], 0, +AT_PARSER_CHECK([[echo p1 t4 o2 p1 p1 t1 o1 t2 p2 o1 t3 p2 p2 | ./glr-regr3]], +0, [[Result: 1c04 ]], []) @@ -339,7 +341,7 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Duplicate representation of merged trees. See ## +## Duplicate representation of merged trees. See ## ## . ## ## ------------------------------------------------------------------------- ## @@ -359,6 +361,8 @@ AT_DATA_GRAMMAR([glr-regr4.y], static char *make_value (char const *, char const *); static void yyerror (char const *); static int yylex (void); + static char *ptrs[100]; + static char **ptrs_next = ptrs; %} %% @@ -394,14 +398,17 @@ yylex (void) int main (void) { - return yyparse (); + int status = yyparse (); + while (ptrs_next != ptrs) + free (*--ptrs_next); + return status; } static char * make_value (char const *parent, char const *child) { char const format[] = "%s <- %s"; - char *value = + char *value = *ptrs_next++ = (char *) malloc (strlen (parent) + strlen (child) + sizeof format); sprintf (value, format, parent, child); return value; @@ -411,7 +418,7 @@ static char * merge (YYSTYPE s1, YYSTYPE s2) { char const format[] = "merge{ %s and %s }"; - char *value = + char *value = *ptrs_next++ = (char *) malloc (strlen (s1.ptr) + strlen (s2.ptr) + sizeof format); sprintf (value, format, s1.ptr, s2.ptr); return value; @@ -424,12 +431,12 @@ yyerror (char const *msg) } ]]) -AT_CHECK([[bison -o glr-regr4.c glr-regr4.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr4.c glr-regr4.y]], 0, [], [glr-regr4.y: conflicts: 1 reduce/reduce ]) AT_COMPILE([glr-regr4]) -AT_CHECK([[./glr-regr4]], 0, +AT_PARSER_CHECK([[./glr-regr4]], 0, [[merge{ S <- merge{ A <- A1 <- 'a' and A <- A2 <- 'a' } and S <- B <- 'a' } ]], []) @@ -437,7 +444,7 @@ AT_CLEANUP ## -------------------------------------------------------------------------- ## -## User destructor for unresolved GLR semantic value. See ## +## User destructor for unresolved GLR semantic value. See ## ## . ## ## -------------------------------------------------------------------------- ## @@ -497,12 +504,12 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr5.c glr-regr5.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr5.c glr-regr5.y]], 0, [], [glr-regr5.y: conflicts: 1 reduce/reduce ]) AT_COMPILE([glr-regr5]) -AT_CHECK([[./glr-regr5]], 0, [], +AT_PARSER_CHECK([[./glr-regr5]], 0, [], [syntax is ambiguous ]) @@ -510,7 +517,7 @@ AT_CLEANUP ## -------------------------------------------------------------------------- ## -## User destructor after an error during a split parse. See ## +## User destructor after an error during a split parse. See ## ## . ## ## -------------------------------------------------------------------------- ## @@ -562,12 +569,12 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr6.c glr-regr6.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr6.c glr-regr6.y]], 0, [], [glr-regr6.y: conflicts: 1 reduce/reduce ]) AT_COMPILE([glr-regr6]) -AT_CHECK([[./glr-regr6]], 0, +AT_PARSER_CHECK([[./glr-regr6]], 0, [Destructor called. ], [syntax is ambiguous @@ -577,7 +584,7 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Duplicated user destructor for lookahead. See ## +## Duplicated user destructor for lookahead. See ## ## . ## ## ------------------------------------------------------------------------- ## @@ -591,14 +598,19 @@ AT_DATA_GRAMMAR([glr-regr7.y], static void yyerror (char const *); static int yylex (void); #define YYSTACKEXPANDABLE 0 + typedef struct count_node { + int count; + struct count_node *prev; + } count_node; + static count_node *tail; %} %glr-parser -%union { int *count; } -%type 'a' +%union { count_node *node; } +%type 'a' %destructor { - if ((*$$)++) + if ($$->count++) fprintf (stderr, "Destructor called on same value twice.\n"); } 'a' @@ -617,13 +629,15 @@ stack2: 'a' ; static int yylex (void) { - yylval.count = (int *) malloc (sizeof (int)); - if (!yylval.count) + yylval.node = (count_node*) malloc (sizeof *yylval.node); + if (!yylval.node) { fprintf (stderr, "Test inconclusive.\n"); exit (EXIT_FAILURE); } - *yylval.count = 0; + yylval.node->count = 0; + yylval.node->prev = tail; + tail = yylval.node; return 'a'; } @@ -636,16 +650,23 @@ yyerror (char const *msg) int main (void) { - return yyparse (); + int status = yyparse (); + while (tail) + { + count_node *prev = tail->prev; + free (tail); + tail = prev; + } + return status; } ]]) -AT_CHECK([[bison -o glr-regr7.c glr-regr7.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr7.c glr-regr7.y]], 0, [], [glr-regr7.y: conflicts: 2 reduce/reduce ]) AT_COMPILE([glr-regr7]) -AT_CHECK([[./glr-regr7]], 2, [], +AT_PARSER_CHECK([[./glr-regr7]], 2, [], [memory exhausted ]) @@ -654,7 +675,7 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## ## Incorrect default location for empty right-hand sides. Adapted from bug ## -## report by Claudia Hermann. ## +## report by Claudia Hermann. ## ## See http://lists.gnu.org/archive/html/bug-bison/2005-10/msg00069.html and ## ## http://lists.gnu.org/archive/html/bug-bison/2005-10/msg00072.html ## ## ------------------------------------------------------------------------- ## @@ -680,25 +701,25 @@ AT_DATA_GRAMMAR([glr-regr8.y], %% -PortClause : T_PORT InterfaceDeclaration T_PORT - { printf("%d/%d - %d/%d - %d/%d\n", - @1.first_column, @1.last_column, - @2.first_column, @2.last_column, - @3.first_column, @3.last_column); } - ; +PortClause : T_PORT InterfaceDeclaration T_PORT + { printf("%d/%d - %d/%d - %d/%d\n", + @1.first_column, @1.last_column, + @2.first_column, @2.last_column, + @3.first_column, @3.last_column); } + ; -InterfaceDeclaration : OptConstantWord %dprec 1 - | OptSignalWord %dprec 2 - ; +InterfaceDeclaration : OptConstantWord %dprec 1 + | OptSignalWord %dprec 2 + ; -OptConstantWord : /* empty */ - | T_CONSTANT - ; +OptConstantWord : /* empty */ + | T_CONSTANT + ; -OptSignalWord : /* empty */ - { printf("empty: %d/%d\n", @$.first_column, @$.last_column); } - | T_SIGNAL - ; +OptSignalWord : /* empty */ + { printf("empty: %d/%d\n", @$.first_column, @$.last_column); } + | T_SIGNAL + ; %% @@ -738,12 +759,12 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr8.c glr-regr8.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr8.c glr-regr8.y]], 0, [], [glr-regr8.y: conflicts: 1 reduce/reduce ]) AT_COMPILE([glr-regr8]) -AT_CHECK([[./glr-regr8]], 0, +AT_PARSER_CHECK([[./glr-regr8]], 0, [empty: 9/9 1/9 - 9/9 - 13/17 ], @@ -753,7 +774,7 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## -## No users destructors if stack 0 deleted. See ## +## No users destructors if stack 0 deleted. See ## ## . ## ## ------------------------------------------------------------------------- ## @@ -821,12 +842,12 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr9.c glr-regr9.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr9.c glr-regr9.y]], 0, [], [glr-regr9.y: conflicts: 1 reduce/reduce ]) AT_COMPILE([glr-regr9]) -AT_CHECK([[./glr-regr9]], 0, [], +AT_PARSER_CHECK([[./glr-regr9]], 0, [], [memory exhausted ]) @@ -834,7 +855,7 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Corrupted semantic options if user action cuts parse. ## +## Corrupted semantic options if user action cuts parse. ## ## ------------------------------------------------------------------------- ## AT_SETUP([Corrupted semantic options if user action cuts parse]) @@ -888,18 +909,18 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr10.c glr-regr10.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr10.c glr-regr10.y]], 0, [], [glr-regr10.y: conflicts: 1 reduce/reduce ]) AT_COMPILE([glr-regr10]) -AT_CHECK([[./glr-regr10]], 0, [], []) +AT_PARSER_CHECK([[./glr-regr10]], 0, [], []) AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Undesirable destructors if user action cuts parse. ## +## Undesirable destructors if user action cuts parse. ## ## ------------------------------------------------------------------------- ## AT_SETUP([Undesirable destructors if user action cuts parse]) @@ -957,18 +978,18 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr11.c glr-regr11.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr11.c glr-regr11.y]], 0, [], [glr-regr11.y: conflicts: 1 reduce/reduce ]) AT_COMPILE([glr-regr11]) -AT_CHECK([[./glr-regr11]], 0, [], []) +AT_PARSER_CHECK([[./glr-regr11]], 0, [], []) AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Leaked semantic values if user action cuts parse. ## +## Leaked semantic values if user action cuts parse. ## ## ------------------------------------------------------------------------- ## AT_SETUP([Leaked semantic values if user action cuts parse]) @@ -1088,18 +1109,18 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr12.c glr-regr12.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr12.c glr-regr12.y]], 0, [], [glr-regr12.y: conflicts: 1 shift/reduce, 1 reduce/reduce ]) AT_COMPILE([glr-regr12]) -AT_CHECK([[./glr-regr12]], 0, [], []) +AT_PARSER_CHECK([[./glr-regr12]], 0, [], []) AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Incorrect lookahead during deterministic GLR. See ## +## Incorrect lookahead during deterministic GLR. See ## ## and ## ## . ## ## ------------------------------------------------------------------------- ## @@ -1200,10 +1221,10 @@ print_lookahead (char const *reduction) { printf ("'%c', yylval='", yychar); if (yylval.value > ' ') - printf ("%c", yylval.value); + printf ("%c", yylval.value); printf ("', yylloc=(%d,%d),(%d,%d)", - yylloc.first_line, yylloc.first_column, - yylloc.last_line, yylloc.last_column); + yylloc.first_line, yylloc.first_column, + yylloc.last_line, yylloc.last_column); } printf ("\n"); } @@ -1217,10 +1238,10 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr13.c glr-regr13.y]], 0, [], []) +AT_BISON_CHECK([[-o glr-regr13.c glr-regr13.y]], 0, [], []) AT_COMPILE([glr-regr13]) -AT_CHECK([[./glr-regr13]], 0, +AT_PARSER_CHECK([[./glr-regr13]], 0, [defstate_init <- empty string: yychar=YYEMPTY nondefstate <- empty string: @@ -1237,7 +1258,7 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Incorrect lookahead during nondeterministic GLR. ## +## Incorrect lookahead during nondeterministic GLR. ## ## ------------------------------------------------------------------------- ## AT_SETUP([Incorrect lookahead during nondeterministic GLR]) @@ -1297,7 +1318,7 @@ merge: | conflict defstate_look 'a' nonconflict2 'b' defstate_shift %dprec 2 { USE ($3); USE ($5); print_lookahead ("merge <- conflict defstate_look 'a' nonconflict2 'b'" - " defstate_shift"); + " defstate_shift"); } ; @@ -1344,7 +1365,7 @@ alt1: USE ($1); if (yychar != 'd' && yychar != YYEOF) { - fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); + fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); } } ; @@ -1353,7 +1374,7 @@ alt2: USE ($1); if (yychar != 'd' && yychar != YYEOF) { - fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); + fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); } } ; @@ -1362,7 +1383,7 @@ alt3: USE ($1); if (yychar != 'd' && yychar != YYEOF) { - fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); + fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); } } ; @@ -1370,8 +1391,8 @@ no_look: { if (yychar != YYEMPTY) { - fprintf (stderr, - "Found lookahead where shouldn't during stack explosion.\n"); + fprintf (stderr, + "Found lookahead where shouldn't during stack explosion.\n"); } } ; @@ -1409,10 +1430,10 @@ print_lookahead (char const *reduction) { printf ("'%c', yylval='", yychar); if (yylval.value > ' ') - printf ("%c", yylval.value); + printf ("%c", yylval.value); printf ("', yylloc=(%d,%d),(%d,%d)", - yylloc.first_line, yylloc.first_column, - yylloc.last_line, yylloc.last_column); + yylloc.first_line, yylloc.first_column, + yylloc.last_line, yylloc.last_column); } printf ("\n"); } @@ -1433,12 +1454,12 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr14.c glr-regr14.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr14.c glr-regr14.y]], 0, [], [glr-regr14.y: conflicts: 3 reduce/reduce ]) AT_COMPILE([glr-regr14]) -AT_CHECK([[./glr-regr14]], 0, +AT_PARSER_CHECK([[./glr-regr14]], 0, [conflict <- empty string: yychar='a', yylval='A', yylloc=(1,1),(1,1) defstate_look <- empty string: @@ -1457,7 +1478,7 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Leaked semantic values when reporting ambiguity. ## +## Leaked semantic values when reporting ambiguity. ## ## ------------------------------------------------------------------------- ## AT_SETUP([Leaked semantic values when reporting ambiguity]) @@ -1537,12 +1558,12 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr15.c glr-regr15.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr15.c glr-regr15.y]], 0, [], [glr-regr15.y: conflicts: 2 reduce/reduce ]) AT_COMPILE([glr-regr15]) -AT_CHECK([[./glr-regr15]], 0, [], +AT_PARSER_CHECK([[./glr-regr15]], 0, [], [syntax is ambiguous ]) @@ -1550,7 +1571,7 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Leaked lookahead after nondeterministic parse syntax error. ## +## Leaked lookahead after nondeterministic parse syntax error. ## ## ------------------------------------------------------------------------- ## AT_SETUP([Leaked lookahead after nondeterministic parse syntax error]) @@ -1606,12 +1627,12 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr16.c glr-regr16.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr16.c glr-regr16.y]], 0, [], [glr-regr16.y: conflicts: 1 reduce/reduce ]) AT_COMPILE([glr-regr16]) -AT_CHECK([[./glr-regr16]], 0, [], +AT_PARSER_CHECK([[./glr-regr16]], 0, [], [syntax error ]) @@ -1619,7 +1640,7 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Uninitialized location when reporting ambiguity. ## +## Uninitialized location when reporting ambiguity. ## ## ------------------------------------------------------------------------- ## AT_SETUP([Uninitialized location when reporting ambiguity]) @@ -1627,7 +1648,7 @@ AT_DATA_GRAMMAR([glr-regr17.y], [[ %glr-parser %locations -%pure-parser +%define api.pure %error-verbose %union { int dummy; } @@ -1668,8 +1689,8 @@ empty2: ; static void yyerror (YYLTYPE *locp, char const *msg) { - fprintf (stderr, "Error at %d.%d-%d.%d: %s.\n", locp->first_line, - locp->first_column, locp->last_line, locp->last_column, msg); + fprintf (stderr, "%d.%d-%d.%d: %s.\n", locp->first_line, + locp->first_column, locp->last_line, locp->last_column, msg); } static int @@ -1693,13 +1714,13 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr17.c glr-regr17.y]], 0, [], +AT_BISON_CHECK([[-o glr-regr17.c glr-regr17.y]], 0, [], [glr-regr17.y: conflicts: 3 reduce/reduce ]) AT_COMPILE([glr-regr17]) -AT_CHECK([[./glr-regr17]], 0, [], -[Error at 1.1-2.3: syntax is ambiguous. +AT_PARSER_CHECK([[./glr-regr17]], 0, [], +[1.1-2.3: syntax is ambiguous. ]) AT_CLEANUP @@ -1759,11 +1780,128 @@ main (void) } ]]) -AT_CHECK([[bison -o glr-regr18.c glr-regr18.y]], 1, [], -[glr-regr18.y:26.18-24: result type clash on merge function `merge': != +AT_BISON_CHECK([[-o glr-regr18.c glr-regr18.y]], 1, [], +[glr-regr18.y:26.18-24: result type clash on merge function 'merge': != glr-regr18.y:25.18-24: previous declaration -glr-regr18.y:27.13-19: result type clash on merge function `merge': != +glr-regr18.y:27.13-19: result type clash on merge function 'merge': != glr-regr18.y:26.18-24: previous declaration ]) AT_CLEANUP + + +## ------------------- ## +## Ambiguity reports. ## +## ------------------- ## + +AT_SETUP([Ambiguity reports]) + +AT_DATA_GRAMMAR([input.y], +[[ +%{ + #include + #include + static void yyerror (char const *); + static int yylex (void); +%} + +%debug +%glr-parser + +%% +start: + 'a' b 'c' d +| 'a' b 'c' d +; +b: 'b'; +d: /* nada. */; +%% + +static int +yylex (void) +{ + static char const input[] = "abc"; + static size_t toknum; + if (! (toknum < sizeof input)) + abort (); + return input[toknum++]; +} + +static void +yyerror (char const *msg) +{ + fprintf (stderr, "%s\n", msg); +} + +int +main (void) +{ + yydebug = 1; + return !!yyparse (); +} +]]) + +AT_BISON_CHECK([[-o input.c input.y]], 0, [], +[input.y: conflicts: 1 reduce/reduce +]) +AT_COMPILE([input]) + +AT_PARSER_CHECK([[./input]], 1, [], +[Starting parse +Entering state 0 +Reading a token: Next token is token 'a' () +Shifting token 'a' () +Entering state 1 +Reading a token: Next token is token 'b' () +Shifting token 'b' () +Entering state 3 +Reducing stack 0 by rule 3 (line 25): + $1 = token 'b' () +-> $$ = nterm b () +Entering state 4 +Reading a token: Next token is token 'c' () +Shifting token 'c' () +Entering state 6 +Reducing stack 0 by rule 4 (line 26): +-> $$ = nterm d () +Entering state 7 +Reading a token: Now at end of input. +Stack 0 Entering state 7 +Now at end of input. +Splitting off stack 1 from 0. +Reduced stack 1 by rule #2; action deferred. Now in state 2. +Stack 1 Entering state 2 +Now at end of input. +Reduced stack 0 by rule #1; action deferred. Now in state 2. +Merging stack 0 into stack 1. +Stack 1 Entering state 2 +Now at end of input. +Removing dead stacks. +Rename stack 1 -> 0. +On stack 0, shifting token $end () +Stack 0 now in state #5 +Ambiguity detected. +Option 1, + start -> + 'a' + b + 'c' + d + +Option 2, + start -> + 'a' + b + 'c' + d + +syntax is ambiguous +Cleanup: popping token $end () +Cleanup: popping unresolved nterm start () +Cleanup: popping nterm d () +Cleanup: popping token 'c' () +Cleanup: popping nterm b () +Cleanup: popping token 'a' () +]) + +AT_CLEANUP