--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/SemaTemplate/temp_arg.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+template<typename T, 
+         int I, 
+         template<typename> class TT>
+  class A; // expected-note 3 {{template is declared here}}
+
+template<typename> class X;
+
+A<int, 0, X> * a1;
+
+A<float, 1, X, double> *a2; // expected-error{{too many template arguments for class template 'A'}}
+A<float, 1> *a3; // expected-error{{too few template arguments for class template 'A'}}
+A a4; // expected-error{{use of class template 'A' requires template arguments}}
+
+namespace test0 {
+  template <class t> class foo {};
+  template <class t> class bar {
+    bar(::test0::foo<tee> *ptr) {} // FIXME(redundant): expected-error 2 {{use of undeclared identifier 'tee'}}
+  };
+}