--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp2a/desig1.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,21 @@
+// { dg-do compile }
+// { dg-options "-pedantic" }
+
+struct A { int a; };
+struct B { int b; A c; int d; };
+A a = { 1 };
+A b = { .a = 2 };			// { dg-warning "designated initializers only available with" "" { target c++17_down } }
+B c = { 3, { 4 }, 5 };
+B d = { .b = 6, .c { 7 }, .d = 8 };	// { dg-warning "designated initializers only available with" "" { target c++17_down } }
+B e = { .c = { .a = 9 } };		// { dg-warning "designated initializers only available with" "" { target c++17_down } }
+
+int
+main ()
+{
+  if (a.a != 1 || b.a != 2
+      || c.b != 3 || c.c.a != 4 || c.d != 5
+      || d.b != 6 || d.c.a != 7 || d.d != 8
+      || e.b != 0 || e.c.a != 9 || e.d != 0)
+    __builtin_abort ();
+  return 0;
+}