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).
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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