* src/main.c (main): If there are complains after grammar

reductions, then output the report anyway if requested, then die.
* src/symtab.c (bucket_new): Initialize `value' to -1, not 0.
* src/reader.c (eoftoken): New.
(parse_token_decl): If the token being defined has value `0', it
is the eoftoken.
(packsymbols): No longer hack `tags' to insert `$' by hand.
Be sure to preserve the value of the eoftoken.
(reader): Make sure eoftoken is defined.
Initialize nsyms to 0: now eoftoken is created just like the others.
* src/print.c (print_grammar): Don't special case the eof token.
* src/regression.at: Adjust: `$' has value 0, not -1, which was a
lie anyway, albeit pleasant.
* tests/calc.at: Exercise error messages with eoftoken.
Change the grammar so that empty input is invalid.
Adjust expectations.
When yyungeting, be sure to use a valid yylloc: use last_yylloc.

src/symtab.c

@@ -55,7 +55,7 @@ bucket_new (const char *tag, int hashval)
   res->next = NULL;
   res->tag = xstrdup (tag);
   res->type_name = NULL;
-  res->value = 0;
+  res->value = -1;
   res->prec = 0;
   res->assoc = right_assoc;
   res->user_token_number = SUNDEF;