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// check-pass
#![feature(type_alias_impl_trait)]
pub type Successors<'a> = impl Iterator<Item = &'a ()>;
pub fn f<'a>() -> Successors<'a> {
None.into_iter()
}
pub trait Tr {
type Item;
}
impl<'a> Tr for &'a () {
type Item = Successors<'a>;
}
pub fn kazusa<'a>() -> <&'a () as Tr>::Item {
None.into_iter()
}
fn main() {}
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