fix: improve literal extraction from certain repetitions #1033
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When repetitions didn't have an explicit max value, like in `(ab){2,}` the literal extractor was producing sub-optimal literals, like `"ab"` instead of `"abab"`.
Close rust-lang#1032
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When repetitions didn't have an explicit max value, like in
(ab){2,}the literal extractor was producing sub-optimal literals, like"ab"instead of"abab".Close #1032