--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/SemaTemplate/instantiate-call.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,51 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+namespace N1 {
+  struct X0 { };
+
+  int& f0(X0);
+}
+
+namespace N2 {
+  char& f0(char);
+
+  template<typename T, typename Result>
+  struct call_f0 {
+    void test_f0(T t) {
+      Result result = f0(t);
+    }
+  };
+}
+
+template struct N2::call_f0<int, char&>;
+template struct N2::call_f0<N1::X0, int&>;
+
+namespace N3 {
+  template<typename T, typename Result>
+  struct call_f0 {
+    void test_f0(T t) {
+      Result &result = f0(t); // expected-error {{undeclared identifier}} \
+                                 expected-error {{neither visible in the template definition nor found by argument-dependent lookup}}
+    }
+  };
+}
+
+template struct N3::call_f0<int, char&>; // expected-note{{instantiation}}
+template struct N3::call_f0<N1::X0, int&>;
+
+short& f0(char); // expected-note {{should be declared prior to the call site}}
+namespace N4 {
+  template<typename T, typename Result>
+  struct call_f0 {
+    void test_f0(T t) {
+      Result &result = f0(t);
+    }
+  };
+}
+
+template struct N4::call_f0<int, short&>;
+template struct N4::call_f0<N1::X0, int&>;
+template struct N3::call_f0<int, short&>; // expected-note{{instantiation}}
+
+// FIXME: test overloaded function call operators, calls to member
+// functions, etc.