--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp0x/desig5.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,13 @@
+// PR c++/87324
+// { dg-do compile { target c++11 } }
+// { dg-options "-Wno-pedantic" }
+
+struct {
+  struct {
+    double a;
+    struct {
+      short b;
+    };
+  };
+  int c;
+} d{.a = 7, .a = 8.09};  // { dg-error "designator used multiple times in the same initializer list" }