--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-requires14.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,24 @@
+// { dg-do compile { target c++2a } }
+
+template<typename T>
+concept A = sizeof(T) >= 4;
+
+template<typename T>
+concept B = __is_class(T);
+
+template<A T>
+void ok1(T a) {
+  return;
+}
+
+template<typename T>
+  requires B<T>
+void ok2(T a) {
+  return;
+}
+
+template<A T>
+  requires B<T>
+void fun(T a) {
+  return;
+}