Tracking Issue for pointer metadata APIs

<!-- homu-ignore:start --> *[View all comments](https://triagebot.infra.rust-lang.org/gh-comments/rust-lang/rust/issues/81513)* <!-- homu-ignore:end --> This is a tracking issue for the RFC 2580 "Pointer metadata & VTable" (rust-lang/rfcs#2580). The feature gate for the issue is `#![feature(ptr_metadata)]`. ### About tracking issues Tracking issues are used to record the overall progress of implementation. They are also used as hubs connecting to other relevant issues, e.g., bugs or open design questions. A tracking issue is however *not* meant for large scale discussion, questions, or bug reports about a feature. Instead, open a dedicated issue for the specific matter and add the relevant feature gate label. ### Steps - [x] Implement the RFC (cc @rust-lang/libs @rust-lang/lang -- can anyone write up mentoring instructions?) - [ ] Adjust documentation ([see instructions on rustc-dev-guide][doc-guide]) - [ ] Stabilization PR ([see instructions on rustc-dev-guide][stabilization-guide]) [stabilization-guide]: https://rustc-dev-guide.rust-lang.org/stabilization_guide.html#stabilization-pr [doc-guide]: https://rustc-dev-guide.rust-lang.org/stabilization_guide.html#documentation-prs ### Unresolved Questions Language-level: * Is it, or should it be UB (through validity or safety invariants) to have a raw trait object wide pointer with an dangling vtable pointer? A null vtable pointer? If not, `DynMetadata` methods like `size` may need to be `unsafe fn`. Or maybe somet

Posted by KodrAus on Jan 29, 2021, 12:42 PM

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• github (Sysadmin)

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