Clarify Unsize documentation
#117495
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Clarify Unsize documentation
#117495
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…iaskrgr Rollup of 4 pull requests Successful merges: - rust-lang#117394 (use global cache when computing proof trees) - rust-lang#117495 (Clarify `Unsize` documentation) - rust-lang#117509 (Remove support for alias `-Z symbol-mangling-version`) - rust-lang#117512 (Expand mem::offset_of! docs) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#117495 - compiler-errors:unsize-docs, r=lcnr Clarify `Unsize` documentation The documentation erroneously says that: ```rust /// - Types implementing a trait `Trait` also implement `Unsize<dyn Trait>`. /// - Structs `Foo<..., T, ...>` implement `Unsize<Foo<..., U, ...>>` if all of these conditions /// are met: /// - `T: Unsize<U>`. /// - Only the last field of `Foo` has a type involving `T`. /// - `Bar<T>: Unsize<Bar<U>>`, where `Bar<T>` stands for the actual type of that last field. ``` Specifically, `T: Unsize<U>` is not required to hold -- only the final field must implement `FinalField<T>: Unsize<FinalField<U>>`. This can be demonstrated by the test I added. --- Second commit fleshes out the documentation a lot more.
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82: Automated pull from upstream `master` r=tshepang a=github-actions[bot] This PR pulls the following changes from the upstream repository: * rust-lang/rust#117313 * rust-lang/rust#117131 * rust-lang/rust#117134 * rust-lang/rust#117471 * rust-lang/rust#117521 * rust-lang/rust#117513 * rust-lang/rust#117512 * rust-lang/rust#117509 * rust-lang/rust#117495 * rust-lang/rust#117394 * rust-lang/rust#117466 * rust-lang/rust#117204 * rust-lang/rust#117386 * rust-lang/rust#117506 Co-authored-by: Nicholas Nethercote <n.nethercote@gmail.com> Co-authored-by: roblabla <unfiltered@roblab.la> Co-authored-by: Michael Goulet <michael@errs.io> Co-authored-by: massivebird <gdrakemail@gmail.com> Co-authored-by: bors <bors@rust-lang.org> Co-authored-by: Zalathar <Zalathar@users.noreply.github.com> Co-authored-by: lcnr <rust@lcnr.de> Co-authored-by: Joshua Liebow-Feeser <joshlf@users.noreply.github.com> Co-authored-by: Matthias Krüger <matthias.krueger@famsik.de>
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The documentation erroneously says that:
Specifically,
T: Unsize<U>is not required to hold -- only the final field must implementFinalField<T>: Unsize<FinalField<U>>. This can be demonstrated by the test I added.Second commit fleshes out the documentation a lot more.