File: wf-self-type.rs

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rustc 1.70.0%2Bdfsg1-9
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struct Foo<'a, 'b: 'a>(&'a &'b ());

impl<'a, 'b> Foo<'a, 'b> {
    fn xmute(a: &'b ()) -> &'a () {
        unreachable!()
    }
}

pub fn foo<'a, 'b>(u: &'b ()) -> &'a () {
    Foo::xmute(u) //~ ERROR lifetime may not live long enough
}

fn main() {}