Add test for c++/71166

[Marek Polacek]

This bug was fixed in r238395, so what remains to do for GCC 7 is to add a
testcase and close the PR.

Tested on x86_64-linux, ok for trunk?

2017-01-13  Marek Polacek  <pola...@redhat.com>

        PR c++/71166
        * g++.dg/cpp0x/constexpr-array18.C: New test.

diff --git gcc/testsuite/g++.dg/cpp0x/constexpr-array18.C 
gcc/testsuite/g++.dg/cpp0x/constexpr-array18.C
index e69de29..0f2d86e 100644
--- gcc/testsuite/g++.dg/cpp0x/constexpr-array18.C
+++ gcc/testsuite/g++.dg/cpp0x/constexpr-array18.C
@@ -0,0 +1,23 @@
+// PR c++/71166
+// { dg-do compile { target c++11 } }
+
+struct Foo { int value; };
+
+constexpr Foo MakeFoo() { return Foo{0}; }
+
+struct Bar {
+  Foo color = MakeFoo();
+};
+
+struct BarContainer {
+  Bar array[1];
+};
+
+Foo X ()
+{
+  return MakeFoo ();
+}
+
+void Foo() {
+  new BarContainer();
+}

        Marek