Don't create references to uninitialized data in List::from_arena
#87268
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Jul 19, 2021
…laumeGomez Rollup of 8 pull requests Successful merges: - rust-lang#86230 (Add --nocapture option to rustdoc) - rust-lang#87210 (Rustdoc accessibility: make the sidebar headers actual headers) - rust-lang#87227 (Move asm! and global_asm! to core::arch) - rust-lang#87236 (Simplify command-line argument initialization on unix) - rust-lang#87251 (Fix "item info" width) - rust-lang#87256 (Extend HIR-based WF checking to associated type defaults) - rust-lang#87259 (triagebot shortcut config) - rust-lang#87268 (Don't create references to uninitialized data in `List::from_arena`) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Previously
resultandarena_slicewere references pointing to uninitialized data, which is technically UB. They may have been fine because the pointed data isCopyand and they were only written to, but the semantics of this aren't clearly defined yet, and since we have a sound way to do the same thing I don't think we should keep the possibly-unsound way.