--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp0x/sfinae60.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,25 @@
+// PR c++/78489
+// { dg-do compile { target c++11 } }
+
+template <bool P, class T = void> struct enable_if { using type = T; };
+template <class T> struct enable_if<false, T> {};
+
+template <class Dummy> struct use_type { using type = int; };
+
+template <bool Pred>
+struct get_type {
+    static_assert(Pred, "");
+    using type = int;
+};
+
+template <bool Val,
+              class      = typename enable_if<Val>::type, // Evaluation/Substitution should end here
+              class ValT = typename get_type<Val>::type,  // This should not be instantiated
+              typename use_type<ValT>::type = 0           // This NTTP causes ValT to be required
+            >
+constexpr bool test(int) { return false; }
+
+template <bool>
+constexpr bool test(long) { return true; }
+
+static_assert(test<false>(0), ""); // should call test(long)