Re: FYI: default %destructor/%printer for error, $undefined, $accept

[Joel E. Denny]

On Mon, 21 Aug 2006, Paul Eggert wrote:

> Obviously it's bogus to copy the value from the lookahead token.  But
> what about "error: ...;" rules?  For them, it sort of makes sense to
> have a type for the error token.

As far as I can tell, Bison doesn't permit error token rules in any form 
yet.  Right?

> Perhaps if we had some way to specify the semantic value for an error
> token that is generated internally by the parser?  Just thinking out
> loud here.

Can you give me an example of how error token values would be useful?

Joel