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Allow for the `const` keyword to be used in trait impls. #38

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JohnBobbo96 wants to merge 1 commit into dtolnay:master from JohnBobbo96:const_impls

JohnBobbo96 commented Apr 8, 2023

Allow for the const keyword to be used in trait
impls. This can be used to implement const traits
on nightly, for example:

// this requires a feature gate for now.
#![feature(const_trait_impl)]

#[rustversion::attr(nightly, const_trait)]
trait Foo {
    fn foo() -> u32;
}

#[rustversion::attr(nightly, const)]
// this turns into `impl const Foo for u32`.
impl Foo for u32 {
    fn foo() -> u32 {
        42
    }
}


Allow for the const keyword to be used in trait

801d9d2

impls as well as functions.

JohnBobbo96 closed this

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