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Tracking Issue for {array, slice}::{from_ref, from_mut} as const fn #90206
Description
Feature gates: #![feature(const_array_from_ref)] and #![feature(const_slice_from_ref)]
This is a tracking issue for {array, slice}::{from_ref, from_mut} functions marked as const fn
Public API
This feature makes the following APIs const:
// core::array
pub const fn from_mut<T>(s: &mut T) -> &mut [T; 1];
// core::slice
pub const fn from_mut<T>(s: &mut T) -> &mut [T];These functions as const were previously tracked here, but are now stabilized:
// core::array
pub const fn from_ref<T>(s: &T) -> &[T; 1];
// core::slice
pub const fn from_ref<T>(s: &T) -> &[T];Steps / History
- Implementation: Mark
{array, slice}::{from_ref, from_mut}as const fn #90162 - Stabilization of
_reffunctions: Stabilize{slice,array}::from_ref#97366 - Final comment period (FCP)
- Stabilization PR
Unresolved Questions
- None yet.
Reacted by Stepan Koltsov and José Luis Cruz
Activity
Amanieu commentedon May 23, 2022
@rfcbot fcp merge
rfcbot commentedon May 23, 2022
Team member @Amanieu has proposed to merge this. The next step is review by the rest of the tagged team members:
No concerns currently listed.
Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!
See this document for info about what commands tagged team members can give me.
WaffleLapkin commentedon May 23, 2022
Note that
from_mutis not being stabilized as&mutis unstable inconstcontext.cc @oli-obk
Amanieu commentedon May 23, 2022
Tracking issue for
&mutinconst: #57349rfcbot commentedon May 24, 2022
🔔 This is now entering its final comment period, as per the review above. 🔔
oli-obk commentedon May 24, 2022
cc @rust-lang/wg-const-eval
1 remaining item
Rollup merge of rust-lang#97366 - WaffleLapkin:stabilize_array_slice_…
Rollup merge of #97366 - WaffleLapkin:stabilize_array_slice_from_ref,…
WaffleLapkin commentedon Mar 7, 2023
This still tracks
{array,slice}::from_mutas a const fn.dtolnay commentedon Sep 22, 2024
@rust-lang/libs-api:
@rfcbot fcp merge
from_refwas stabilized for const in 1.63. Nowfrom_muthas been unblocked by the stabilization of #57349.dtolnay commentedon Sep 22, 2024
FCP for
from_mut: #130538 (comment)Auto merge of rust-lang#130538 - ultrabear:ultrabear_const_from_ref, …
Rollup merge of rust-lang#130538 - ultrabear:ultrabear_const_from_ref…
Rollup merge of rust-lang#130538 - ultrabear:ultrabear_const_from_ref…
Unrolled build for rust-lang#130538
compiler-errors commentedon Feb 10, 2025
both seem to have been stabilized, so closing