--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-pr71368.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,28 @@
+// PR c++/71368
+// { dg-do compile { target c++2a } }
+
+template <class T, class U> concept Same = __is_same_as(T,U);
+
+struct inner;
+
+template<typename X> concept CompoundReq = requires {
+    // fine with concrete type in trailing type, i.e. inner& instead of X&
+    { X::inner_member() } -> Same<X&>;
+};
+
+template<typename X> concept Concept = requires {
+    { X::outer_member() } -> CompoundReq;
+};
+
+struct inner { static inner& inner_member(); };
+struct outer { static inner outer_member(); };
+
+int main()
+{
+    // fine
+    static_assert( CompoundReq<inner> );
+    static_assert( CompoundReq<decltype( outer::outer_member() )> );
+
+    // ICE
+    static_assert( Concept<outer> );
+}