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Auto merge of #73490 - CAD97:range-unchecked-stepping, r=Amanieu
authorbors <bors@rust-lang.org>
Tue, 14 Jul 2020 08:56:06 +0000 (08:56 +0000)
committerbors <bors@rust-lang.org>
Tue, 14 Jul 2020 08:56:06 +0000 (08:56 +0000)
Use step_unchecked more liberally in range iter impls

Without these `_unchecked`, these operations on iterators of `char` fail to optimize out the unreachable panicking condition on overflow.

cc @cuviper https://github.com/rayon-rs/rayon/pull/771 where this was discovered.

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src/libcore/iter/range.rs patch | diff1 | diff2 | blob | history

diff --cc src/libcore/iter/range.rs
Simple merge
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