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// Regression test for #137287
mod defining_scope {
use super::*;
pub type Alias<T> = impl Sized;
//~^ ERROR unconstrained opaque type
//~| ERROR `impl Trait` in type aliases is unstable
pub fn cast<T>(x: Container<Alias<T>, T>) -> Container<T, T> {
x
//~^ ERROR mismatched types
}
}
struct Container<T: Trait<U>, U> {
x: <T as Trait<U>>::Assoc,
}
trait Trait<T> {
type Assoc;
}
impl<T> Trait<T> for T {
type Assoc = Box<u32>;
}
impl<T> Trait<T> for defining_scope::Alias<T> {
//~^ ERROR conflicting implementations of trait `Trait<_>`
type Assoc = usize;
}
fn main() {
let x: Box<u32> = defining_scope::cast::<()>(Container { x: 0 }).x;
}
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