--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-86953.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,19 @@
+// PR c++/86953
+// { dg-do run { target c++11 } }
+// { dg-options "-O2" }
+
+struct B {
+  double x;
+  bool y, z;
+  constexpr bool operator== (const B& o) const noexcept
+  {
+    return x == o.x && y == o.y && z == o.z;
+  }
+  constexpr bool operator!= (const B& o) const noexcept { return !(*this == o); }
+};
+
+int
+main ()
+{
+  bool b = B{} == B{};
+}