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| author | Mara Bos <m-ou.se@m-ou.se> | 2021-01-16 17:29:51 +0000 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-01-16 17:29:51 +0000 |
| commit | d8843d9d82950eeb27bdce496f6179b085549d29 (patch) | |
| tree | 5d207c7bb5b66b95b81040b8b02f683fdf1f4ce9 /src/test/codegen/src-hash-algorithm | |
| parent | af5b0d9883b7e6b8f27b431e5471bf658f3e0db0 (diff) | |
| parent | af2983a9122138cb9055b79fda54e72f71599a6f (diff) | |
| download | rust-d8843d9d82950eeb27bdce496f6179b085549d29.tar.gz rust-d8843d9d82950eeb27bdce496f6179b085549d29.zip | |
Rollup merge of #80670 - the8472:fix-zip-trusted-random-access-composition, r=m-ou-se
TrustedRandomAaccess specialization composes incorrectly for nested iter::Zips I found this while working on improvements for TRA. After partially consuming a Zip adapter and then wrapping it into another Zip where the adapters use their `TrustedRandomAccess` specializations leads to the outer adapter returning elements which should have already been consumed. If the optimizer gets tripped up by the addition this might affect performance for chained `zip()` iterators even when the inner one is not partially advanced but it would require more extensive fixes to `TrustedRandomAccess` to communicate those offsets earlier. Included test fails on nightly, [playground link](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=24fa1edf8a104ff31f5a24830593b01f)
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