1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/rustdoc-ui/infinite-recursive-type-impl-trait-return.rs b/src/test/rustdoc-ui/infinite-recursive-type-impl-trait-return.rs
new file mode 100644
index 000000000..2319de556
--- /dev/null
+++ b/src/test/rustdoc-ui/infinite-recursive-type-impl-trait-return.rs
@@ -0,0 +1,15 @@
+// normalize-stderr-test: "`.*`" -> "`DEF_ID`"
+// normalize-stdout-test: "`.*`" -> "`DEF_ID`"
+// edition:2018
+
+pub async fn f() -> impl std::fmt::Debug {
+    #[derive(Debug)]
+    enum E {
+    //~^ ERROR recursive type `f::{closure#0}::E` has infinite size
+        This(E),
+        Unit,
+    }
+    E::Unit
+}
+
+fn main() {}