tests/ui/impl-trait/issues/issue-87340.rs

#![feature(type_alias_impl_trait)]

trait X {
    type I;
    fn f() -> Self::I;
}

impl<T> X for () {
//~^ ERROR `T` is not constrained by the impl trait, self type, or predicates
    type I = impl Sized;
    fn f() -> Self::I {}
}

fn main() {}