Tests may not guarantee correctness, but they are often suggestive.
When I have a bunch of regression tests for *real* issues, I feel a lot more confident. I'm covering ways I've failed in the past.
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It's weird removing syntactic features from a programming language. Do you provide tests?
The odds of regression are small (unlikely to accidentally reimplement it unless there are bad merges). I feel it's good to exercise the change somehow though.
Benchmarking correctly is hard. Criterion generates HTML reports: http://t.co/J15W2yTr2q and performs linear regression to measure noise!