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When variant are enabled, the yylhs variable (the left-hand side of the rule being reduced, i.e. $$ and @$) is explicitly destroyed when YYERROR is called. This is because before running the user code, $$ is initialized, so that the user can properly use it. However, when quitting yyparse, yylhs is also reclaimed by the C++ compiler: the variable goes out of scope. Instead of trying to be too smart, let the compiler do its job: reduce the scope of yylhs to exactly the reduction. This way, whatever the type of scope exit (regular, exception, return, goto...) this variable will be properly reclaimed. Reported by Paolo Simone Gasparello. <http://lists.gnu.org/archive/html/bug-bison/2013-10/msg00003.html> * data/lalr1.cc (yyparse): Reduce the scope of yylhs. * tests/c++.at: We now pass this test.
-*- outline -*- This directory contains data needed by Bison. * Skeletons Bison skeletons: the general shapes of the different parser kinds, that are specialized for specific grammars by the bison program. Currently, the supported skeletons are: - yacc.c It used to be named bison.simple: it corresponds to C Yacc compatible LALR(1) parsers. - lalr1.cc Produces a C++ parser class. - lalr1.java Produces a Java parser class. - glr.c A Generalized LR C parser based on Bison's LALR(1) tables. - glr.cc A Generalized LR C++ parser. Actually a C++ wrapper around glr.c. These skeletons are the only ones supported by the Bison team. Because the interface between skeletons and the bison program is not finished, *we are not bound to it*. In particular, Bison is not mature enough for us to consider that "foreign skeletons" are supported. * m4sugar This directory contains M4sugar, sort of an extended library for M4, which is used by Bison to instantiate the skeletons. * xslt This directory contains XSLT programs that transform Bison's XML output into various formats. - bison.xsl A library of routines used by the other XSLT programs. - xml2dot.xsl Conversion into GraphViz's dot format. - xml2text.xsl Conversion into text. - xml2xhtml.xsl Conversion into XHTML. ----- Copyright (C) 2002, 2008-2013 Free Software Foundation, Inc. This file is part of GNU Bison. 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/>.