#![feature(trait_alias)]
trait Foo: Iterator<Item = i32> {}
-trait Bar: Foo<Item = u32> {} //~ ERROR type annotations required
+trait Bar: Foo<Item = u32> {} //~ ERROR type annotations needed
trait I32Iterator = Iterator<Item = i32>;
-trait U32Iterator = I32Iterator<Item = u32>;
+trait U32Iterator = I32Iterator<Item = u32>; //~ ERROR type annotations needed
fn main() {
let _: &dyn I32Iterator<Item = u32>;