--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/PCH/dllexport-default-arg-closure.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,26 @@
+// Make sure we emit the MS ABI default ctor closure with PCH.
+//
+// Test this without pch.
+// RUN: %clang_cc1 -fms-extensions -triple x86_64-windows-msvc -std=c++11 -include %s -emit-llvm -o - %s | FileCheck %s
+
+// Test with pch.
+// RUN: %clang_cc1 -fms-extensions -triple x86_64-windows-msvc -std=c++11 -emit-pch -o %t %s
+// RUN: %clang_cc1 -fms-extensions -triple x86_64-windows-msvc -std=c++11 -include-pch %t -emit-llvm -o - %s | FileCheck %s
+
+#ifndef HEADER
+#define HEADER
+
+struct __declspec(dllexport) Foo {
+  enum E { E0 } e;
+  Foo(E e = E0) : e(e) {}
+};
+
+// Demangles as:
+// void Foo::`default constructor closure'(void)
+// CHECK: define weak_odr dso_local dllexport void @"??_FFoo@@QEAAXXZ"(%struct.Foo*{{.*}})
+// CHECK:   call %struct.Foo* @"??0Foo@@QEAA@W4E@0@@Z"(%struct.Foo* {{.*}}, i32 0)
+
+#else
+
+
+#endif