Tracking Issue for #![feature(const_unsafecell_get_mut)]

[WaffleLapkin]

Feature gate: #![feature(const_unsafecell_get_mut)]

This is a tracking issue for UnsafeCell::get_mut as a const fn.

Public API

// core::cell

impl<T> UnsafeCell<T> {
    pub const fn get_mut(&mut self) -> &mut T;
}

Steps / History

• Implementation: Make UnsafeCell::get_mut const #88722
• Final comment period (FCP)
• Stabilization PR

Unresolved Questions

• None yet.

[RalfJung]

Cc @rust-lang/wg-const-eval

[tgross35]

This is blocked on #57349, correct?

[RalfJung]

Yeah, pretty much all the mutable reference/pointer stuff in const is blocked on that.

[workingjubilee]

etc. etc. #57349 landed now let's see if we have consensus for stabilizing this?

[dtolnay]

@rfcbot fcp merge

const for https://doc.rust-lang.org/nightly/std/cell/struct.UnsafeCell.html#method.get_mut

[rfcbot]

Team member @dtolnay has proposed to merge this. The next step is review by the rest of the tagged team members:

• @Amanieu
• @BurntSushi
• @dtolnay
• @joshtriplett
• @m-ou-se

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.