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Showing content from https://github.com/rust-lang/rust/issues/121675 below:

Tracking Issue for the `Freeze` trait · Issue #121675 · rust-lang/rust · GitHub

Feature gate: #![feature(freeze)]

This is a tracking issue for the core::marker::Freeze trait

This trait allows generic code to restrict generic parameters to types without interior mutability.

use std::marker::Freeze;

trait Trait<T: Freeze + 'static> {
    const VALUE: T;
    const VALUE_REF: &'static T = &Self::VALUE;
}

• Implementation: Expose the Freeze trait again (unstably) and forbid implementing it manually #121840
• Final comment period (FCP)¹
• Stabilization PR

• naming the trait differently (see #121501 (comment))

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩

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