--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp0x/defaulted58.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,22 @@
+// Core Issue #1331 (const mismatch with defaulted copy constructor)
+// { dg-do compile { target c++11 } }
+
+struct M
+{
+  M() = default;
+  M& operator=(M&);
+};
+
+template<typename T> struct W
+{
+  W() = default;
+  W& operator=(const W&) = default; // { dg-error "binding" }
+  T t;
+};
+
+int
+main ()
+{
+  W<M> w1, w2;
+  w1 = w2; // { dg-error "use of deleted function" }
+}