--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-member-concept.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,21 @@
+// { dg-do compile { target c++2a } }
+
+// FIXME: Diagnostics should be better.
+
+struct Base {
+  template<typename T>
+  static concept D = __is_same_as(T, int); // { dg-error "static data member" }
+
+  template<typename T, typename U>
+  static concept E = __is_same_as(T, U); // { dg-error "static data member" }
+
+  template<typename T>
+  concept C1 = __is_same_as(T, int); // { dg-error "not in namespace scope" }
+};
+
+union U {
+  template<typename T>
+  concept C = true; // // { dg-error "not in namespace scope" }
+};
+
+// { dg-excess-errors "deprecated" }