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C-bugCategory: This is a bug.Category: This is a bug.P-mediumMedium priorityMedium priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.
Description
assert_eq!(std::mem::size_of::<std::borrow::Cow<'static, str>>(), 24);
Passes on stable and beta but not on Nightly.
I bisected it, results below which point to #102750:
searched nightlies: from nightly-2022-10-20 to nightly-2022-12-06
regressed nightly: nightly-2022-11-24
searched commit range: ff8c8df...70f8737
regressed commit: 4e0d0d7
bisected with cargo-bisect-rustc v0.6.5
Host triple: x86_64-unknown-linux-gnu
Reproduce with:
cargo bisect-rustc --start 2022-10-20
@rustbot modify labels: +regression-from-stable-to-nightly -regression-untriaged
Qqwy
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C-bugCategory: This is a bug.Category: This is a bug.P-mediumMedium priorityMedium priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.