File: issue-70121.rs

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rustc 1.85.0%2Bdfsg3-1
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#![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()
    //~^ ERROR mismatched types
}

fn main() {}