offset_of: don't require type to be Sized
#112069
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r? @cjgillot (rustbot has picked a reviewer for you, use r? to override) |
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Hmm, it looks like these tests are testing things that the RFC currently disallows 🤔 |
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The RFC is intentionally limited to allow a pure library implementation. My implementation also included several of the future possibilities, including supporting DSTs. |
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I don't think there are any implementation concerns with allowing unsized fields, so there's no reason not to. |
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Yeah the ability to get the offset of fields that are part of the sized prelude of an unsized type would be great. This is one of the things that is impossible to do (in a sound way) in libraries but it is needed by the users of one of the projects I maintain. |
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clubby789
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Sized
WaffleLapkin
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May 30, 2023
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…r=WaffleLapkin offset_of: don't require type to be `Sized` Fixes rust-lang#112051 ~~The RFC [explicitly forbids](https://rust-lang.github.io/rfcs/3308-offset_of.html#limitations) non-`Sized` types, but it looks like only the fields being recursed into were checked. The sized check also seemed to have been completely missing for tuples~~
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…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#112031 (Migrate `item_proc_macro` to Askama) - rust-lang#112053 (Remove `-Zcgu-partitioning-strategy`.) - rust-lang#112069 (offset_of: don't require type to be `Sized`) - rust-lang#112084 (enhancements on build_helper utilization and rustdoc-gui-test) - rust-lang#112096 (Remove array_zip) - rust-lang#112108 (Fix re-export of doc hidden item inside private item not displayed) - rust-lang#112113 (rustdoc: simplify `clean` by removing `FnRetTy`) r? `@ghost` `@rustbot` modify labels: rollup
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Fixes #112051
The RFC explicitly forbids non-Sizedtypes, but it looks like only the fields being recursed into were checked. The sized check also seemed to have been completely missing for tuples