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// edition:2021
#![feature(anonymous_lifetime_in_impl_trait)]
// This is understood as `fn foo<'_1>(_: impl Iterator<Item = &'_1 ()>) {}`.
fn f(_: impl Iterator<Item = &'_ ()>) {}
// But that lifetime does not participate in resolution.
fn g(mut x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
//~^ ERROR missing lifetime specifier
// This is understood as `fn foo<'_1>(_: impl Iterator<Item = &'_1 ()>) {}`.
async fn h(_: impl Iterator<Item = &'_ ()>) {}
// But that lifetime does not participate in resolution.
async fn i(mut x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
//~^ ERROR missing lifetime specifier
//~| ERROR lifetime may not live long enough
fn main() {}
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