Undo the Sized specialization from Iterator::nth#46074
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@bors r+ I'm fine with being suspicious of Sized vs ?Sized specialization — not so long ago it was always an ICE. Please report a bug for the problems you found. |
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Undo the Sized specialization from Iterator::nth I just added this as part of #45595, but I'm now afraid there's a specialization issue with it, since I tried to add [another similar specialization](https://github.com/rust-lang/rust/compare/master...scottmcm:faster-iter-by-ref?expand=1#diff-1398f322bc563592215b583e9b0ba936R2390), and ended up getting really disturbing test failures like ``` thread 'iter::test_by_ref_folds' panicked at 'assertion failed: `(left == right)` left: `15`, right: `15`', src\libcore\../libcore/tests\iter.rs:1720:4 ``` So since this wasn't the most critical part of the change and a new beta is branching within a week, I think putting this part back to what it was before is the best option.
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☀️ Test successful - status-appveyor, status-travis |
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I just added this as part of #45595, but I'm now afraid there's a specialization issue with it, since I tried to add another similar specialization, and ended up getting really disturbing test failures like
So since this wasn't the most critical part of the change and a new beta is branching within a week, I think putting this part back to what it was before is the best option.