Rollup of 3 pull requests #91311
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Rollup of 3 pull requests #91311
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Prior to PR rust-lang#91205, checking for errors in the overall obligation would check checking the `ParamEnv`, due to an incorrect `super_visit_with` impl. With this bug fixed, we will now bail out of impl candidate assembly if the `ParamEnv` contains any error types. In practice, this appears to be overly conservative - when an error occurs early in compilation, we end up giving up early for some predicates that we could have successfully evaluated without overflow. By only checking for errors in the predicate itself, we avoid causing additional spurious 'type annotations needed' errors after a 'real' error has already occurred. With this PR, the diagnostic changes caused by PR rust-lang#91205 are reverted.
…t, r=oli-obk Stabilize some `MaybeUninit` behavior as const This stabilizes the `MaybeUninit::as_ptr`, `MaybeUninit::assume_init`, and `MaybeUninit::assume_init_ref` as `const fn`. `MaybeUninit::as_mut_ptr` has been moved to a new flag: `const_maybe_uninit_as_mut_ptr`, which is blocked on rust-lang#57349. `MaybeUninit::slice_assume_init_ref` can be `const fn` when the method is stabilized in general. The relevant intrinsic has been stabilized as `const` as well, though this isn't user-visible. Due to the seemingly unrelated feature name I performed `rg const_assert_type` and found no other instances of it being used. r? `@oli-obk` `@rustbot` label: +A-const-fn +S-waiting-on-review +T-libs-api
…lcnr Only check for errors in predicate when skipping impl assembly Prior to PR rust-lang#91205, checking for errors in the overall obligation would check checking the `ParamEnv`, due to an incorrect `super_visit_with` impl. With this bug fixed, we will now bail out of impl candidate assembly if the `ParamEnv` contains any error types. In practice, this appears to be overly conservative - when an error occurs early in compilation, we end up giving up early for some predicates that we could have successfully evaluated without overflow. By only checking for errors in the predicate itself, we avoid causing additional spurious 'type annotations needed' errors after a 'real' error has already occurred. With this PR, the diagnostic changes caused by PR rust-lang#91205 are reverted.
Miri: fix alignment check in array initialization rust-lang#85376 introduced a regression in Miri, reported at rust-lang/miri#1919 and rust-lang/miri#1925. This PR fixes that. I will add tests to Miri once this lands. r? `@oli-obk` Fixes rust-lang/miri#1919 Fixes rust-lang/miri#1925
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@bors r+ rollup=never p=3 |
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📌 Commit 7134ae0 has been approved by |
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☀️ Test successful - checks-actions |
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Finished benchmarking commit (58f9efd): comparison url. Summary: This benchmark run did not return any relevant changes. If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf. @rustbot label: -perf-regression |
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Successful merges:
MaybeUninitbehavior as const #90896 (Stabilize someMaybeUninitbehavior as const)Failed merges:
r? @ghost
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