[antlr-interest] bug: invalid "Syntactic predicate superfluous" warning

[thrutchy]

I used a syntactic predicate in a loop to solve an ambiguity:

( (a) => a )*

but, it still gave the ambiguity warning plus a new one:

warning:nondeterminism upon
               ...
    between alt 1 and exit branch of block
warning:Syntactic predicate superfluous for single alternative

The syntactic predicate did solve my problem and thus wasn't
superfluous.  Effectively there are always effectively at least two
alternatives in a loop because of the exit condition.

( (a) => a )+ also exhibits the same problem.  ( (a) => a )? gives no
warning.

Eric




 
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