[antlr-interest] Getting information on failed syntactic predicate?

[Daniel Shane]

Hi,

Is it possible to get some information on why a certain syntactic predicate 
failed?

eg. If I have the following rule:

a:
   (b)=> b
  | c

and b does not match, is it possible to have the "reason" why b failed? This 
would be the error message generated by:

a:
  b

ideally.

Is this possible?

Thanks in advance!
Daniel Shane

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