[antlr-interest] combined grammar filter options is invalid now?

[文少华]

Hi there,
  In antlr 3.0.1 , it works , but now it will report error for grammar
optoins like:

grammar test;

options {
  k = 3;
  filter=true;
  output = AST;
  backtrack = true;
  memoize = true;
}

Is this a bug or something changed but not in the change log?
BR.
Holy
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