1 files changed, 23 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/auto-trait-leak.rs b/tests/ui/impl-trait/auto-trait-leak.rs
new file mode 100644
index 00000000000..c2fbbf94fd6
--- /dev/null
+++ b/tests/ui/impl-trait/auto-trait-leak.rs
@@ -0,0 +1,23 @@
+use std::cell::Cell;
+use std::rc::Rc;
+
+fn send<T: Send>(_: T) {}
+
+fn main() {
+}
+
+// Cycles should work as the deferred obligations are
+// independently resolved and only require the concrete
+// return type, which can't depend on the obligation.
+fn cycle1() -> impl Clone {
+    //~^ ERROR cycle detected
+    send(cycle2().clone());
+
+    Rc::new(Cell::new(5))
+}
+
+fn cycle2() -> impl Clone {
+    send(cycle1().clone());
+
+    Rc::new(String::from("foo"))
+}