1 files changed, 45 insertions, 0 deletions
diff --git a/clang/test/SemaCXX/ms-friend-function-decl.cpp b/clang/test/SemaCXX/ms-friend-function-decl.cpp
new file mode 100644
index 0000000..d146305
--- /dev/null
+++ b/clang/test/SemaCXX/ms-friend-function-decl.cpp
@@ -0,0 +1,45 @@
+// RUN: %clang_cc1 -std=c++03 -fms-compatibility -fsyntax-only -verify %s
+// RUN: %clang_cc1 -std=c++17 -fms-compatibility -fsyntax-only -verify %s
+// RUN: %clang_cc1 -std=c++20 -fms-compatibility -fsyntax-only -verify=modern %s
+#if __cplusplus < 202002L
+// expected-no-diagnostics
+#endif
+
+namespace ns {
+
+class C {
+public:
+  template <typename T>
+  friend void funtemp();
+
+  friend void fun();
+
+  void test() {
+    ::ns::fun(); // modern-error {{no member named 'fun' in namespace 'ns'}}
+
+    // modern-error@+3 {{no member named 'funtemp' in namespace 'ns'}}
+    // modern-error@+2 {{expected '(' for function-style cast or type construction}}
+    // modern-error@+1 {{expected expression}}
+    ::ns::funtemp<int>();
+  }
+};
+
+void fun() {
+}
+
+template <typename T>
+void funtemp() {}
+
+} // namespace ns
+
+class Glob {
+public:
+  friend void funGlob();
+
+  void test() {
+    funGlob(); // modern-error {{use of undeclared identifier 'funGlob'}}
+  }
+};
+
+void funGlob() {
+}