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Discussed starting at <http://lists.gnu.org/archive/html/bison-patches/2006-07/msg00019.html> and <http://lists.gnu.org/archive/html/help-bison/2006-07/msg00013.html>. Make the skeletons consistent in how they pop the end token and invoke its %destructor. * data/glr.c (yyrecoverSyntaxError, yyparse): Don't pop the start state, which has token number 0, since this would invoke the %destructor for the end token. * data/lalr1.cc (yy::parser::parse): Don't check for the final state until after shifting the end token, or else it won't be popped. * data/yacc.c (yyparse): Likewise. * data/glr.c (yyparse): Clear the lookahead after shifting it even when it's the end token. Upon termination, destroy an unshifted lookahead even when it's the end token. * data/lalr1.cc (yy::parser::parse): Likewise. * data/yacc.c (yyparse): Likewise. * src/reader.c (packgram): Don't check rule 0. This suppresses unused value warnings for the end token when the user gives the end token a %destructor. * tests/actions.at (Printers and Destructors): Test all the above.
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