[antlr-interest] Disabling Lexer rules using predicates

[Thomas Karcher]

Hi,

> ANTLR into considering this as a semantic predicate? I already tried  
> "{ inElement }?=>" but that didn't help.

Something like
STEP	:	{prefixed}? => 'step'
	;

works for me. STEP is not emitted if prefixed is false.


Thomas


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