1 files changed, 16 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-28550.rs b/tests/ui/issues/issue-28550.rs
new file mode 100644
index 000000000..95583f805
--- /dev/null
+++ b/tests/ui/issues/issue-28550.rs
@@ -0,0 +1,16 @@
+// run-pass
+struct A<F: FnOnce()->T,T>(F::Output);
+struct B<F: FnOnce()->T,T>(A<F,T>);
+
+// Removing Option causes it to compile.
+fn foo<T,F: FnOnce()->T>(f: F) -> Option<B<F,T>> {
+    Some(B(A(f())))
+}
+
+fn main() {
+    let v = (|| foo(||4))();
+    match v {
+        Some(B(A(4))) => {},
+        _ => unreachable!()
+    }
+}