--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp2a/spaceship-synth-neg2.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,25 @@
+// PR c++/92774
+// { dg-do compile { target c++2a } }
+
+#include <compare>
+
+template<typename T>
+struct X { };
+
+template<typename T>
+bool operator==(const X<T>&, const X<T>&) { return true; }
+template<typename T>
+bool operator<(const X<T>&, const X<T>&) { return true; }
+
+struct Y
+{
+  int a;
+  X<int> c;
+
+  auto operator <=>(Y const&) const = default; // { dg-error "no match" }
+};
+
+void f()
+{
+  auto x = Y() < Y();		// { dg-error "deleted" }
+}