Minimum viable example of calling Rust from Ruby without a gem.

19-Jul-2019 2254
For Rubyfmt I'm currently looking at rewritingsignificant sections in Rust, because there's some performance issues. Broadlyspeaking, it turns out that cleaning up a very large Ruby parse tree (e.g. 4000lines) can be slow because of the number of comparisons that have to be made.Rust can do this a lot faster.
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