Benchmarks for different ruby grammar files.

Ruby grammar file with combined if/unless and while/until rules
Tokenizing 611 lines
Took 168 milliseconds
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Original ruby grammar file
Tokenizing 611 lines
Took 78 milliseconds
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Ruby grammar file with splited if/unless and while/until rules
Tokenizing 611 lines
Took 117 milliseconds
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Optimized Ruby grammar file
Tokenizing 611 lines
Took 93 milliseconds
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