1 files changed, 38 insertions, 0 deletions
diff --git a/test/Modules/pr27401.cpp b/test/Modules/pr27401.cpp
new file mode 100644
index 000000000000..7d5479cb9243
--- /dev/null
+++ b/test/Modules/pr27401.cpp
@@ -0,0 +1,38 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -std=c++11 -I%S/Inputs/PR27401 -verify %s
+// RUN: %clang_cc1 -std=c++11 -fmodules -fmodule-map-file=%S/Inputs/PR27401/module.modulemap -fmodules-cache-path=%t -I%S/Inputs/PR27401 -verify %s
+
+#include "a.h"
+#define _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);
+};
+
+template <class _Tp, class _Allocator>
+vector<_Tp, _Allocator>::vector(const vector &__x) : __vector_base<_Tp, _Allocator>(__x.__alloc()) {}
+
+  struct CommentOptions {
+    vector<char>  ParseAllComments;
+    CommentOptions() {}
+  };
+  struct PrintingPolicy {
+    PrintingPolicy(CommentOptions LO) : LangOpts(LO) {}
+    CommentOptions LangOpts;
+  };
+
+#include "b.h"
+CommentOptions fn1() { return fn1(); }
+
+// expected-no-diagnostics