Document requirements for unsized {Rc,Arc}::from_raw #120449
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…llaumeGomez Rollup of 8 pull requests Successful merges: - rust-lang#120449 (Document requirements for unsized {Rc,Arc}::from_raw) - rust-lang#120505 (Fix BTreeMap's Cursor::remove_{next,prev}) - rust-lang#120672 (std::thread update freebsd stack guard handling.) - rust-lang#121088 (Implicitly enable evex512 if avx512 is enabled) - rust-lang#121104 (Ignore unsized types when trying to determine the size of the original type) - rust-lang#121107 (Fix msg for verbose suggestions with confusable capitalization) - rust-lang#121113 (Continue compilation even if inherent impl checks fail) - rust-lang#121120 (Add `ErrorGuaranteed` to `ast::LitKind::Err`, `token::LitKind::Err`.) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#120449 - udoprog:document-unsized-rc-arc-from-raw, r=m-ou-se Document requirements for unsized {Rc,Arc}::from_raw This seems to be implied due to these types supporting operation-less unsized coercions. Taken together with the [established behavior of a wide to thin pointer cast](rust-lang/reference#1451) it would enable unsafe downcasting of these containers. Note that the term "data pointer" is adopted from rust-lang/rfcs#3559 See also this [internals thread](https://internals.rust-lang.org/t/can-unsafe-smart-pointer-downcasts-be-correct/20229/2).
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This seems to be implied due to these types supporting operation-less unsized coercions. Taken together with the established behavior of a wide to thin pointer cast it would enable unsafe downcasting of these containers.
Note that the term "data pointer" is adopted from rust-lang/rfcs#3559
See also this internals thread.