1 files changed, 21 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-47309.rs b/tests/ui/issues/issue-47309.rs
new file mode 100644
index 000000000..abed9687b
--- /dev/null
+++ b/tests/ui/issues/issue-47309.rs
@@ -0,0 +1,21 @@
+// Make sure that the mono-item collector does not crash when trying to
+// instantiate a default impl of a method with lifetime parameters.
+// See https://github.com/rust-lang/rust/issues/47309
+
+// compile-flags:-Clink-dead-code
+// build-pass
+
+#![crate_type="rlib"]
+
+pub trait EnvFuture {
+    type Item;
+
+    fn boxed_result<'a>(self) where Self: Sized, Self::Item: 'a, {
+    }
+}
+
+struct Foo;
+
+impl<'a> EnvFuture for &'a Foo {
+    type Item = ();
+}