--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/SemaCXX/overload-call-copycon.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,57 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s -Wnon-pod-varargs
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s -Wnon-pod-varargs
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s -Wnon-pod-varargs
+
+class X { }; // expected-note {{the implicit copy constructor}}
+// expected-note@-1 {{the implicit default constructor}}
+#if __cplusplus >= 201103L // C++11 or later
+// expected-note@-3 {{candidate constructor (the implicit move constructor) not viable}}
+#endif
+
+int& copycon(X x); // expected-note{{passing argument to parameter}}
+float& copycon(...);
+
+void test_copycon(X x, X const xc, X volatile xv) {
+  int& i1 = copycon(x);
+  int& i2 = copycon(xc);
+  copycon(xv); // expected-error{{no matching constructor}}
+}
+
+class A {
+public:
+  A(A&); // expected-note{{would lose const qualifier}} \
+         // expected-note{{no known conversion}}
+};
+
+class B : public A { }; // expected-note{{would lose const qualifier}} \
+// expected-note{{would lose volatile qualifier}} \
+// expected-note 2{{requires 0 arguments}}
+
+short& copycon2(A a); // expected-note{{passing argument to parameter}}
+int& copycon2(B b); // expected-note 2{{passing argument to parameter}}
+float& copycon2(...);
+
+void test_copycon2(A a, const A ac, B b, B const bc, B volatile bv) {
+  int& i1 = copycon2(b);
+  copycon2(bc); // expected-error{{no matching constructor}}
+  copycon2(bv); // expected-error{{no matching constructor}}
+  short& s1 = copycon2(a);
+  copycon2(ac); // expected-error{{no matching constructor}}
+}
+
+int& copycon3(A a); // expected-note{{passing argument to parameter 'a' here}}
+float& copycon3(...);
+
+void test_copycon3(B b, const B bc) {
+  int& i1 = copycon3(b);
+  copycon3(bc); // expected-error{{no matching constructor}}
+}
+
+class C : public B { };
+
+float& copycon4(A a);
+int& copycon4(B b);
+
+void test_copycon4(C c) {
+  int& i = copycon4(c);
+};