File: lint-ctypes-73251-1.rs

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#![feature(type_alias_impl_trait)]
#![deny(improper_ctypes)]

trait Baz {}

impl Baz for u32 {}

type Qux = impl Baz;

trait Foo {
    type Assoc;
}

impl Foo for u32 {
    type Assoc = Qux;
}

fn assign() -> Qux {
    1
}

extern "C" {
    fn lint_me() -> <u32 as Foo>::Assoc; //~ ERROR: uses type `Qux`
}

fn main() {}