Token push-back?

[Evan Lavelle]

I'm just about to write a yylex wrapper to let me push back a token so 
that Bison can re-read it. Before I do this, can anyone tell me if 
there's a better way to handle this?

My problem is that I need to write a partial parser, which ignores large 
chunks of a language. The chunks are delimited by known tokens, so I 
need to do something like

ignore_block
   : STARTBLOCK {
     // check yylex input for ENDBLOCK, push it back
     } ENDBLOCK ;

ie. something like a flex exclusive start state, but initiated from Bison.

Thanks -

Evan