Feature gate: #![feature(const_from)]

This is a tracking issue for const From and Into traits, impls, and related functions.

Public API

const {
    let x = 5_u8;
    let y: i32 = x.into();
}

Note: there are a hundreds of implementations that could be made const. However, while const traits are unstable, please limit new const implementations to those that are needed for some specific purpose, e.g. supporting a specific feature or experimenting with a certain aspect of . Anything that is going for "completeness" can be done after stabilization.

Steps / History

(Remember to update the S-tracking-* label when checking boxes.)

• Implementation: constify From and Into #143774
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.