klimek added a comment. Just in general, I'd like to add that my experience over the years dealing with folks trying to do AST matchers is that the inability to express something is much more of a problem than matching too much, simply because the test cases people think of are usually small, and when running a transformation on a very large codebase, the cost of false negatives is significantly higher than the cost of false positive: the cost of a false negative means that you may produce something incorrect. The cost of a false positive is that you adapt your matcher to exclude the false negative.
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