1 files changed, 25 insertions, 0 deletions
diff --git a/test/Modules/extern_cxx.cpp b/test/Modules/extern_cxx.cpp
new file mode 100644
index 0000000000000..97ec726de234b
--- /dev/null
+++ b/test/Modules/extern_cxx.cpp
@@ -0,0 +1,25 @@
+// RUN: %clang_cc1 -x c++-module-map -fmodule-name=A -verify %s -fmodules-local-submodule-visibility
+module A { module B {} module C {} }
+
+#pragma clang module contents
+
+#pragma clang module begin A.B
+extern "C++" {
+  #pragma clang module begin A.C
+  template<typename T> void f(T t);
+  #pragma clang module end
+
+  void g() { f(0); } // ok
+}
+
+extern "C++" {
+  #pragma clang module begin A.C
+  } // expected-error {{extraneous closing brace}}
+  #pragma clang module end
+  
+  #pragma clang module begin A.C
+  extern "C++" { // expected-note {{to match this '{'}}
+  #pragma clang module end // expected-error {{expected '}' at end of module}}
+}
+
+#pragma clang module end