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77757e7680
Remove unused feature gates After finding some unused feature gates in rust-lang/rust#143155 , I wrote a small script to see if I can find any others. And I did. Not a lot, but still a small win 😁 Contains a few instances of `iter_from_coroutine` that can be removed due to rust-lang/rust#142801 (I guess).
For more information about how rustc works, see the rustc dev guide.