1 files changed, 21 insertions, 0 deletions
diff --git a/src/test/ui/suggestions/impl-trait-missing-lifetime-gated.rs b/src/test/ui/suggestions/impl-trait-missing-lifetime-gated.rs
new file mode 100644
index 000000000..fe291e021
--- /dev/null
+++ b/src/test/ui/suggestions/impl-trait-missing-lifetime-gated.rs
@@ -0,0 +1,21 @@
+// 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() {}