re PR c++/58046 (template operator= in SFINAE class)

2016-01-21  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/58046
	* g++.dg/cpp0x/pr58046.C: New.

From-SVN: r232671

gcc/testsuite/ChangeLog

+2016-01-21  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/58046
+	* g++.dg/cpp0x/pr58046.C: New.
+
 2016-01-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/69187

gcc/testsuite/g++.dg/cpp0x/pr58046.C

+// { dg-do compile { target c++11 } }
+
+template<bool, class T = void>
+struct enable_if {};
+
+template<class T>
+struct enable_if<true, T>
+{
+  using type = T;
+};
+
+template<class T>
+struct is_true
+{
+  static constexpr bool value = true;
+};
+
+extern void* enabler;
+
+template <typename T, typename enable_if<is_true<T>::value>::type*& = enabler>
+class A
+{
+public:
+    A()
+    {}
+    template <typename U>
+    A& operator=( A<U>&& )
+    {
+        return *this;
+    }
+};
+
+int main()
+{
+    A<int> a_i;
+    A<double> a_d;
+
+    a_i = a_d;  // { dg-error "cannot bind" }
+}