[antlr-interest] [BUG] 3.0b4 no complaint on parser reference to lexical fragment

[Kay Roepke]

On 13. Nov 2006, at 0:38 , John B. Brodie wrote:

> Sorry if this is a duplicate.
>
> This incorrect grammar draws no error report from org.antlr.Tool

Neither should it, IMHO.

Yes, it will fail to recognize just 'c' as input, but ANTLR can't be  
certain that you didn't
have any actions that explicitely set the token type to C in some  
other rule.
Throwing an error here would mean that you couldn't reference any  
tokens from a @tokens
section, for instance.

cheers,

-k