Check in LLVM r95781.
diff --git a/test/SemaTemplate/instantiate-default-assignment-operator.cpp b/test/SemaTemplate/instantiate-default-assignment-operator.cpp
new file mode 100644
index 0000000..5594d6c
--- /dev/null
+++ b/test/SemaTemplate/instantiate-default-assignment-operator.cpp
@@ -0,0 +1,17 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+template<typename> struct PassRefPtr { };
+template<typename T> struct RefPtr {
+ RefPtr& operator=(const RefPtr&) { int a[sizeof(T) ? -1 : -1];} // expected-error 2 {{array size is negative}}
+ RefPtr& operator=(const PassRefPtr<T>&);
+};
+
+struct A { RefPtr<int> a; };
+struct B : RefPtr<float> { };
+
+void f() {
+ A a1, a2;
+ a1 = a2; // expected-note {{instantiation of member function 'RefPtr<int>::operator=' requested here}}
+
+ B b1, b2;
+ b1 = b2; // expected-note {{in instantiation of member function 'RefPtr<float>::operator=' requested here}}
+}