re PR c++/88744 (class non-type template parameters doesn't work with default template parameters)

	PR c++/88744
	* g++.dg/cpp2a/nontype-class12.C: New test.

From-SVN: r267744

gcc/testsuite/ChangeLog

@@ -3,6 +3,9 @@
 	PR c++/88538 - braced-init-list in template-argument-list.
 	* g++.dg/cpp2a/nontype-class11.C: New test.
 
+	PR c++/88744
+	* g++.dg/cpp2a/nontype-class12.C: New test.
+
 2019-01-08  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/88457

gcc/testsuite/g++.dg/cpp2a/nontype-class12.C

+// PR c++/88744
+// { dg-do compile { target c++2a } }
+
+#define SA(X) static_assert((X),#X)
+
+struct S {
+  int a;
+  int b;
+  constexpr S(int a_, int b_) : a{a_}, b{b_} { }
+};
+
+template<S s = {1, 2}>
+struct X {
+  static constexpr int i = s.a;
+  static constexpr int j = s.b;
+};
+X x; // ok, X<{1, 2}>
+X<{3, 4}> x2;
+
+SA (x.i == 1);
+SA (x.j == 2);
+SA (x2.i == 3);
+SA (x2.j == 4);