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// edition:2021
// gate-test-anonymous_lifetime_in_impl_trait
// Verify the behaviour of `feature(anonymous_lifetime_in_impl_trait)`.
fn f(_: impl Iterator<Item = &'_ ()>) {}
//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
fn g(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
//~^ ERROR anonymous lifetimes in `impl Trait` are unstable
//~| ERROR missing lifetime specifier
// Anonymous lifetimes in async fn are already allowed.
// This is understood as `fn foo<'_1>(_: impl Iterator<Item = &'_1 ()>) {}`.
async fn h(_: impl Iterator<Item = &'_ ()>) {}
// Anonymous lifetimes in async fn are already allowed.
// But that lifetime does not participate in resolution.
async fn i(x: impl Iterator<Item = &'_ ()>) -> Option<&'_ ()> { x.next() }
//~^ ERROR missing lifetime specifier
fn main() {}
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