* src/symtab.c (symbol_free): Remove dead deactivated code:

type_name are properly removed.
Don't use XFREE to free items that cannot be NULL.
* src/struniq.h, src/struniq.c: New.
* src/main.c (main): Initialize/free struniqs.
* src/parse-gram.y (%union): Add astruniq member.
(yyprint): Adjust.
* src/scan-gram.l (<{tag}>): Return a struniq.
Free the obstack bit that used to store it.
* src/symtab.h (symbol_t): The 'type_name' member is a struniq.

src/struniq.h

@@ -0,0 +1,46 @@
+/* Keeping a unique copy of strings.
+   Copyright (C) 2002 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 Bison; see the file COPYING.  If not, write to
+   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef STRUNIQ_H_
+# define STRUNIQ_H_
+
+/*------------------------------------------------------.
+| struniq_t -- pointers to unique copies of C strings.  |
+`------------------------------------------------------*/
+
+typedef char *struniq_t;
+
+/* Return the struniq for S.  */
+const struniq_t struniq_new (const char *s);
+
+/*--------------------------------------.
+| Initializing, destroying, debugging.  |
+`--------------------------------------*/
+
+/* Create the string table.  */
+void struniqs_new (void);
+
+/* Free all the memory allocated for symbols.  */
+void struniqs_free (void);
+
+/* Report them all.  */
+void struniqs_print (void);
+
+#endif /* !STRUNIQ_H_ */