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Attempt to automagically generate jump tables for choice#881
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Attempts to automatically generate jump tables for
choicenodes in cases where all child parsers support presenting a predicate.Effectively, this is a 'free' optimisation that requires no changes to parser implementations.
Things would be improved even more if Rust supported first-class patterns, but alas.
There's more work to do, but the results are already positive (the 'vanilla' benchmarks are likely already optimised to jump tables and so do not experience the same speed-up).