--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/SemaTemplate/instantiation-backtrace.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,51 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+template<typename T> struct A; // expected-note 4{{template is declared here}}
+
+template<typename T> struct B : A<T*> { }; // expected-error{{implicit instantiation of undefined template}} \
+// expected-error{{implicit instantiation of undefined template 'A<X *>'}}
+
+template<typename T> struct C : B<T> { } ; // expected-note{{instantiation of template class}}
+
+template<typename T> struct D : C<T> { }; // expected-note{{instantiation of template class}}
+
+template<typename T> struct E : D<T> { }; // expected-note{{instantiation of template class}}
+
+template<typename T> struct F : E<T(T)> { }; // expected-note{{instantiation of template class}}
+
+void f() {
+ (void)sizeof(F<int>); // expected-note{{instantiation of template class}}
+}
+
+typedef struct { } X;
+
+void g() {
+  (void)sizeof(B<X>); // expected-note{{in instantiation of template class 'B<X>' requested here}}
+}
+
+template<typename T> 
+struct G : A<T>, // expected-error{{implicit instantiation of undefined template 'A<int>'}}
+  A<T*> // expected-error{{implicit instantiation of undefined template 'A<int *>'}}
+  { };
+
+void h() {
+  (void)sizeof(G<int>); // expected-note{{in instantiation of template class 'G<int>' requested here}}
+}
+
+namespace PR13365 {
+  template <class T> class ResultTy { // expected-warning {{does not declare any constructor}}
+    T t; // expected-note {{reference member 't' will never be initialized}}
+  };
+
+  template <class T1, class T2>
+    typename ResultTy<T2>::error Deduce( void (T1::*member)(T2) ) {} // \
+    // expected-note {{instantiation of template class 'PR13365::ResultTy<int &>'}} \
+    // expected-note {{substitution failure [with T1 = PR13365::Cls, T2 = int &]}}
+
+  struct Cls {
+    void method(int&);
+  };
+  void test() {
+    Deduce(&Cls::method); // expected-error {{no matching function}} \
+                          // expected-note {{substituting deduced template arguments into function template 'Deduce' [with T1 = PR13365::Cls, T2 = int &]}}
+  }
+}