File: nested-tait-inference2.rs

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#![feature(type_alias_impl_trait)]
#![allow(dead_code)]

use std::fmt::Debug;

type FooX = impl Debug;

trait Foo<A> {}

impl Foo<()> for () {}
impl Foo<u32> for () {}

fn foo() -> impl Foo<FooX> {
    //~^ ERROR: the trait bound `(): Foo<FooX>` is not satisfied
    ()
}

fn main() {}