--- /dev/null
+// run-pass
+#![allow(dead_code)]
+// Regression test for issue #22655: This test should not lead to
+// infinite recursion.
+
+// pretty-expanded FIXME #23616
+
+unsafe impl<T: Send + ?Sized> Send for Unique<T> { }
+
+pub struct Unique<T:?Sized> {
+ pointer: *const T,
+}
+
+pub struct Node<V> {
+ vals: V,
+ edges: Unique<Node<V>>,
+}
+
+fn is_send<T: Send>() {}
+
+fn main() {
+ is_send::<Node<&'static ()>>();
+}