* 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/parse-gram.h

@@ -1,4 +1,4 @@
-/* A Bison parser, made by GNU Bison 1.75b.  */
+/* A Bison parser, made from parse-gram.y, by GNU bison 1.75b.  */
 
 /* Skeleton parser for Yacc-like parsing with Bison,
    Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002 Free Software Foundation, Inc.
@@ -23,6 +23,9 @@
    This special exception was added by the Free Software Foundation
    in version 1.24 of Bison.  */
 
+#ifndef BISON_PARSE_GRAM_H
+# define BISON_PARSE_GRAM_H
+
 /* Tokens.  */
 #ifndef YYTOKENTYPE
 # define YYTOKENTYPE
@@ -133,11 +136,11 @@ typedef union {
   int integer;
   char *string;
   assoc_t assoc;
+  struniq_t struniq;
 } yystype;
-/* Line 1293 of /tmp/prefix/share/bison/yacc.c.  */
-#line 138 "y.tab.h"
+/* Line 1321 of /usr/local/share/bison/yacc.c.  */
+#line 143 "y.tab.h"
 # define YYSTYPE yystype
-# define YYSTYPE_IS_TRIVIAL 1
 #endif
 
 
@@ -155,4 +158,5 @@ typedef struct yyltype
 
 
 
+#endif /* not BISON_PARSE_GRAM_H */