[antlr-interest] Help writing a particular semantic predicate

[Naveen Chawla]

grammar x;

x:  a b;

     a: 'i' a? | c? 'j';     // Question, how would I write the semantic
predicates: if this "a" is followed by 'v1' choose the first alternative, if
not choose the second alternative

          c: 'i';

     b: 'v1' | 'v2';
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