rust/tests/ui/traits/coherence-alias-hang.rs

24 lines
550 B
Rust

//@ check-pass
// Regression test for nalgebra hang <https://github.com/rust-lang/rust/issues/130056>.
#![feature(lazy_type_alias)]
#![allow(incomplete_features)]
type Id<T: ?Sized> = T;
trait NotImplemented {}
struct W<T: ?Sized, U: ?Sized>(*const T, *const U);
trait Trait {
type Assoc: ?Sized;
}
impl<T: ?Sized + Trait> Trait for W<T, T> {
type Assoc = W<T::Assoc, Id<T::Assoc>>;
}
trait Overlap<T: ?Sized> {}
impl<T: ?Sized> Overlap<T> for W<T, T> {}
impl<T: ?Sized + Trait + NotImplemented> Overlap<T::Assoc> for T {}
fn main() {}