1 files changed, 47 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-53568.rs b/tests/ui/issues/issue-53568.rs
new file mode 100644
index 000000000..49ae444f9
--- /dev/null
+++ b/tests/ui/issues/issue-53568.rs
@@ -0,0 +1,47 @@
+// Regression test for an NLL-related ICE (#53568) -- we failed to
+// resolve inference variables in "custom type-ops".
+//
+// check-pass
+
+trait Future {
+    type Item;
+}
+
+impl<F, T> Future for F
+where F: Fn() -> T
+{
+    type Item = T;
+}
+
+trait Connect {}
+
+struct Connector<H> {
+    handler: H,
+}
+
+impl<H, T> Connect for Connector<H>
+where
+    T: 'static,
+    H: Future<Item = T>
+{
+}
+
+struct Client<C> {
+    connector: C,
+}
+
+fn build<C>(_connector: C) -> Client<C> {
+    unimplemented!()
+}
+
+fn client<H>(handler: H) -> Client<impl Connect>
+where H: Fn() + Copy
+{
+    let connector = Connector {
+        handler,
+    };
+    let client = build(connector);
+    client
+}
+
+fn main() { }