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implement .trailing_ones(), .leading_ones() #55715
This patch implements
I posted a pre-RFC for these changes on internals, but the consensus seemed to be these changes would be small enough that no RFC was needed. So hence this patch!
I've never written a PR for Rustc before, so I hope I'm doing everything right. I realize this patch is probably not good enough to land as-is, so I had a few questions:
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