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Tracking Issue for const_borrow #91522

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lilasta opened this issue Dec 4, 2021 · 2 comments
Open
1 of 3 tasks

Tracking Issue for const_borrow #91522

lilasta opened this issue Dec 4, 2021 · 2 comments
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C-tracking-issue Category: A tracking issue for an RFC or an unstable feature. F-const_trait_impl `#![feature(const_trait_impl)]` T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.

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@lilasta
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lilasta commented Dec 4, 2021 •
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Feature gate: #![feature(const_borrow)]

This is a tracking issue for implementing const Borrow/BorrowMut.

Public API

// core::borrow
impl<T: ?Sized> const Borrow<T> for T
impl<T: ?Sized> const BorrowMut<T> for T
impl<T: ?Sized> const Borrow<T> for &T
impl<T: ?Sized> const Borrow<T> for &mut T
impl<T: ?Sized> const BorrowMut<T> for &mut T

// core::array
impl<T, const N: usize> const Borrow<[T]> for [T; N]
impl<T, const N: usize> const BorrowMut<[T]> for [T; N]

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@lilasta lilasta added C-tracking-issue Category: A tracking issue for an RFC or an unstable feature. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. labels Dec 4, 2021
@lilasta lilasta mentioned this issue Dec 4, 2021
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matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Dec 11, 2021
@matthiaskrgr
Rollup merge of rust-lang#90270 - woppopo:const_borrow_trait, r=dtolnay
ae9dafc 
Make `Borrow` and `BorrowMut` impls `const`

Tracking issue: rust-lang#91522
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Dec 11, 2021
@matthiaskrgr
Rollup merge of rust-lang#90270 - woppopo:const_borrow_trait, r=dtolnay
b3d402e 
Make `Borrow` and `BorrowMut` impls `const`

Tracking issue: rust-lang#91522
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Dec 11, 2021
@matthiaskrgr
Rollup merge of rust-lang#90270 - woppopo:const_borrow_trait, r=dtolnay
40482bb 
Make `Borrow` and `BorrowMut` impls `const`

Tracking issue: rust-lang#91522
@DavidSkrundz
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It appears the implementation was removed in 76dbe29#diff-b8d90f158b67cb63e13a53302629ba287759aed739f9e10ee524d5ef8592b9ca. Is there an alternative or a plan to reintroduce the feature?

@lilasta
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lilasta commented Apr 21, 2023

According to #110395, it will be restored after `~const' trait is reimplemented.

@workingjubilee workingjubilee added the F-const_trait_impl `#![feature(const_trait_impl)]` label Sep 19, 2023
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C-tracking-issue Category: A tracking issue for an RFC or an unstable feature. F-const_trait_impl `#![feature(const_trait_impl)]` T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
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@DavidSkrundz @workingjubilee @lilasta