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Changes to impl Trait in Rust 2024

Starting in Rust 2024, we are changing the rules for when a generic parameter can be used in the hidden type of a return-position impl Trait:

a new default that the hidden types for a return-position impl Trait can use any generic parameter in scope, instead of only types (applicable only in Rust 2024);
a syntax to declare explicitly what types may be used (usable in any edition).

The new explicit syntax is called a "use bound": impl Trait + use<'x, T>, for example, would indicate that the hidden type is allowed to use 'x and T (but not any other generic parameters in scope).

blog.rust-lang.org

Changes to `impl Trait` in Rust 2024 | Rust Blog

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www.tgoop.com/dereference_pointer_there/8570

714 viewsSep 7 at 16:37

#prog #rust

Changes to impl Trait in Rust 2024

Starting in Rust 2024, we are changing the rules for when a generic parameter can be used in the hidden type of a return-position impl Trait:

a new default that the hidden types for a return-position impl Trait can use any generic parameter in scope, instead of only types (applicable only in Rust 2024);
a syntax to declare explicitly what types may be used (usable in any edition).

The new explicit syntax is called a "use bound": impl Trait + use<'x, T>, for example, would indicate that the hidden type is allowed to use 'x and T (but not any other generic parameters in scope).

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