1 files changed, 20 insertions, 0 deletions
diff --git a/src/test/ui/suggestions/impl-trait-missing-lifetime.rs b/src/test/ui/suggestions/impl-trait-missing-lifetime.rs
new file mode 100644
index 000000000..6f7c912d7
--- /dev/null
+++ b/src/test/ui/suggestions/impl-trait-missing-lifetime.rs
@@ -0,0 +1,20 @@
+// 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() {}