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trait Foo: Iterator<Item = i32, Item = i32> {}
//~^ ERROR is already specified
type Unit = ();
fn test() -> Box<Iterator<Item = (), Item = Unit>> {
//~^ ERROR is already specified
Box::new(None.into_iter())
}
fn main() {
let _: &Iterator<Item = i32, Item = i32>;
test();
}
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