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isn't a question of whether the user *declares* that symbol (in %token, for example). It's a question of whether the user by any means *defines* the symbol at all (by simply using a char token, for example). $end is defined by Bison whereas any other token with token number 0 is defined by the user. The error token is always defined by Bison regardless of whether the user declares it with %token, but we may one day let the user define error as a nonterminal instead. * NEWS (2.3+): Say "user-defined" instead of "user-declared". * doc/bison.texinfo (Freeing Discarded Symbols): Likewise, and document the meaning of "user-defined". * tests/actions.at (Default %printer and %destructor for user-declared end token): Rename to... (Default %printer and %destructor for user-defined end token): ... this. * src/symtab.c (symbol_destructor_get, symbol_printer_get): In the computation of whether to apply the default, don't maintain a list of every Bison-defined symbol. Instead, just check for a first character of '$', which a user symbol cannot have, and check for the error token.
This directory contains the Bison parser generator. See the file INSTALL for generic compilation and installation instructions. See the file doc/FAQ for frequently asked questions. Bison requires GNU m4 1.4.3 or later. See: ftp://ftp.gnu.org/gnu/m4/m4-1.4.3.tar.gz Bison can work with pre-1.4.3 distributions of GNU m4 if they are sufficiently patched, but if you encounter a bug with an older distribution and report a bug we will probably suggest that you upgrade to 1.4.3 as the first step in trying to fix it. Please send bug reports to <bug-bison@gnu.org>. Please include the version number from `bison --version', and a complete, self-contained test case in each bug report. If you have questions about using Bison and the documentation does not answer them, please send mail to <help-bison@gnu.org>. ----- Copyright (C) 1992, 1998, 1999, 2003, 2004, 2005 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. Bison 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. Bison 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 autoconf; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.