Crystal and Elixir both borrow heavily from Ruby's syntax but neither is Ruby compatible. The parent comment I think just wants a faster implementation. Though

Crystal and Elixir both borrow heavily from Ruby's syntax but neither is Ruby compatible. The parent comment I think just wants a faster implementation. Though... I think their problem (slow tests) could be easily fixed by dropping factory girl. Fixtures while irritating are much faster and nicer for rails testing (once the suite gets big enough).