File: lint-ctypes-73249-5.rs

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

pub trait Baz {}

impl Baz for u32 {}

type Qux = impl Baz;

#[define_opaque(Qux)]
fn assign() -> Qux {
    3
}

#[repr(transparent)]
pub struct A {
    x: Qux,
}

extern "C" {
    pub fn lint_me() -> A; //~ ERROR: uses type `Qux`
}

fn main() {}