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#![feature(return_position_impl_trait_in_trait)]
trait Extend {
fn extend<'a: 'a>(_: &'a str) -> (impl Sized + 'a, &'static str);
}
impl Extend for () {
fn extend<'a: 'a>(s: &'a str) -> (Option<&'static &'a ()>, &'static str)
//~^ ERROR in type `&'static &'a ()`, reference has a longer lifetime than the data it references
where
'a: 'static,
{
(None, s)
}
}
// This indirection is not necessary for reproduction,
// but it makes this test future-proof against #114936.
fn extend<T: Extend>(s: &str) -> &'static str {
<T as Extend>::extend(s).1
}
fn main() {
let use_after_free = extend::<()>(&String::from("temporary"));
println!("{}", use_after_free);
}
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