--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp1z/decomp47.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,32 @@
+// PR c++/87122
+// { dg-do run { target c++14 } }
+// { dg-options "" }
+
+extern "C" void abort ();
+struct S { int a, b; };
+int c;
+
+template <int N>
+void
+foo ()
+{
+  S x[4] = { { N, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 } };
+  auto f = [](auto & y) {
+    for (auto & [ u, v ] : y)	// { dg-warning "structured bindings only available with" "" { target c++14_down } }
+      {
+	if ((u & 1) != 1 || v != u + 1 || u < N || u > 7 || (c & (1 << u))
+	    || &u != &y[v / 2 - 1].a || &v != &y[v / 2 - 1].b)
+	  abort ();
+	c |= 1 << u;
+      }
+  };
+  f (x);
+}
+
+int
+main ()
+{
+  foo<1> ();
+  if (c != 0xaa)
+    abort ();
+}