Allow checking whether a type allows being uninitialized #108669
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This is useful for clippy and for the future `MaybeUninit::assume_init` panics.
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r? @wesleywiser (rustbot has picked a reviewer for you, use r? to override) |
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Some changes occurred to the CTFE / Miri engine cc @rust-lang/miri |
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@Nilstrieb told me that he was gonna use this in clippy/add usages in a follow-up @bors r+ |
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Rollup of 6 pull requests Successful merges: - rust-lang#108298 (Fix ICE: check if snippet is `)`) - rust-lang#108405 (Lazily compute crate name for consider_optimizing) - rust-lang#108656 (Rustdoc search: Emit an error for unclosed generic) - rust-lang#108660 (Remove ne implementations from strings) - rust-lang#108669 (Allow checking whether a type allows being uninitialized) - rust-lang#108727 (rustc_expand: make proc-macro derive error translatable) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Mar 21, 2023
Use uninit checking from rustc rustc has proper heuristics for actually checking whether a type allows being left uninitialized (by asking CTFE). We can now use this for our helper instead of rolling our own bad version with false positives. I added this in rustc in rust-lang/rust#108669 Fix #10407 changelog: [`uninit_vec`]: fix false positives changelog: [`uninit_assumed_init`]: fix false positives
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This is useful for clippy (rust-lang/clippy#10407) and for the future
MaybeUninit::assume_initpanics (#100423).