[antlr-interest] assign a derived token to the lexer

[Thomas Krebs]

Ric Klaren wrote:
> 
> Make sure your token is derived of CommonToken, then make a RefToken of
> your new token (not a RefCount<ADerived> or you have to cast static_cast

Ah, I actually did that and that was my problem.

> them :( ). When trying to access your own token you would then have to use
> the get() method to access the underlying pointer to the refcounter then
> dynamic_cast or if the situation permits static_cast (but be sure not to
> cheat too much with this pointer).

That works fine now.
Thanks a lot for your help, Ric!

Thomas
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