Why token are numbered from 258?

Peng Yu <[email protected]>
Newsgroups gmane.comp.parsers.bison.general
Message-ID <CABrM6wkGwCnn1+CNQes7D8yvUYBxb725S-=YG546RZ4Cg25mPQ@mail.gmail.com>
Hi,

I don't quite understand why tokens are numbered starting from 258.
What are 256 and 257 for? Thanks.

#define IF 258

-- 
Regards,
Peng

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