Bison 1.75a mishandles unbalanced "[" or "]" in token names

[Paul Eggert]

Recent versions of Bison mishandle token names that contain unbalanced
"[" or "]".  I installed this patch.  I'll add a test case too, in a
patch I'll install soon.

2002-11-02  Paul Eggert  <address@hidden>

        * src/output.c (prepare_symbols): When printing token names,
        escape "[" as "@<:@" and likewise for "]".

Index: output.c
===================================================================
RCS file: /cvsroot/bison/bison/src/output.c,v
retrieving revision 1.203
retrieving revision 1.204
diff -p -u -r1.203 -r1.204
--- output.c    30 Oct 2002 06:20:02 -0000      1.203
+++ output.c    3 Nov 2002 06:41:59 -0000       1.204
@@ -136,7 +136,7 @@ prepare_symbols (void)
        const char *cp =
          quotearg_n_style (1, c_quoting_style,
                            symbols[i]->tag);
-       /* Width of the next token, including the two quotes, the coma
+       /* Width of the next token, including the two quotes, the comma
           and the space.  */
        int strsize = strlen (cp) + 2;
 
@@ -146,7 +146,14 @@ prepare_symbols (void)
            j = 2;
          }
 
-       obstack_sgrow (&format_obstack, cp);
+       for (; *cp; cp++)
+         switch (*cp)
+           {
+           case '[': obstack_sgrow (&format_obstack, "@<:@"); break;
+           case ']': obstack_sgrow (&format_obstack, "@:>@"); break;
+           default: obstack_1grow (&format_obstack, *cp); break;
+           }
+
        obstack_sgrow (&format_obstack, ", ");
        j += strsize;
       }