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Parse type parameter binder #1904

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Merged
merged 2 commits into from
Aug 15, 2025
Merged

Parse type parameter binder #1904

merged 2 commits into from
Aug 15, 2025

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dtolnay
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@dtolnay dtolnay commented Aug 15, 2025

Closes #1435.

Const parameters continue to be unsupported, like in rustc.

#![feature(non_lifetime_binders)]

pub trait Trait<const K: usize> {}

pub fn f<T>()
where
    T: for<const K: usize> Trait<K>,
{}
error: late-bound const parameters cannot be used currently
 --> src/lib.rs:7:18
  |
7 |     T: for<const K: usize> Trait<K>,
  |                  ^

@dtolnay dtolnay merged commit cb18d2f into master Aug 15, 2025
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@dtolnay dtolnay deleted the typebinder branch August 15, 2025 20:37
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Parse non-lifetime binders
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@dtolnay