3 files changed, 39 insertions, 0 deletions
diff --git a/clang/test/Modules/Inputs/PR27401/a.h b/clang/test/Modules/Inputs/PR27401/a.h
new file mode 100644
index 00000000000..63d6b707f46
--- /dev/null
+++ b/clang/test/Modules/Inputs/PR27401/a.h
@@ -0,0 +1,17 @@
+#ifndef _LIBCPP_ALGORITHM
+#define _LIBCPP_ALGORITHM
+template <class _Tp, _Tp>
+struct integral_constant {
+  static const _Tp value = _Tp();
+};
+
+template <class _Tp>
+struct is_nothrow_default_constructible
+	: integral_constant<bool, __is_constructible(_Tp)> {};
+
+template <class _Tp>
+struct is_nothrow_move_constructible
+    : integral_constant<bool, __is_constructible(_Tp, _Tp)> {};
+
+class allocator {};
+#endif
diff --git a/clang/test/Modules/Inputs/PR27401/b.h b/clang/test/Modules/Inputs/PR27401/b.h
new file mode 100644
index 00000000000..2b4e7f14fbb
--- /dev/null
+++ b/clang/test/Modules/Inputs/PR27401/b.h
@@ -0,0 +1,21 @@
+#include "a.h"
+#ifndef _LIBCPP_VECTOR
+template <class, class _Allocator>
+class __vector_base {
+protected:
+  _Allocator __alloc() const;
+  __vector_base(_Allocator);
+};
+
+template <class _Tp, class _Allocator = allocator>
+class vector : __vector_base<_Tp, _Allocator> {
+public:
+  vector() noexcept(is_nothrow_default_constructible<_Allocator>::value);
+  vector(const vector &);
+  vector(vector &&)
+      noexcept(is_nothrow_move_constructible<_Allocator>::value);
+};
+
+#endif
+void GetUniquePtrType() { vector<char> v; }
+
diff --git a/clang/test/Modules/Inputs/PR27401/module.modulemap b/clang/test/Modules/Inputs/PR27401/module.modulemap
new file mode 100644
index 00000000000..a0efadaa0ea
--- /dev/null
+++ b/clang/test/Modules/Inputs/PR27401/module.modulemap
@@ -0,0 +1 @@
+module "b" { header "b.h" export * }