* src/files.c, src/files.h (guard_obstack): Remove.

* src/output.c (output): Adjust.
* src/reader.c (parse_braces): New, factoring...
(copy_action, copy_guard): these two which are renamed as...
(parse_action, parse_guard): these.
As a voluntary consequence, using braces around guards is now
mandatory.

src/output.c

@@ -1128,6 +1128,5 @@ output (void)
   obstack_free (&muscle_obstack, NULL);
   obstack_free (&format_obstack, NULL);
   obstack_free (&action_obstack, NULL);
-  obstack_free (&guard_obstack, NULL);
   obstack_free (&attrs_obstack, NULL);
 }