--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/lib/AST/AttrImpl.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,19 @@
+//===--- AttrImpl.cpp - Classes for representing attributes -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file contains out-of-line methods for Attr classes.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Attr.h"
+#include "clang/AST/Expr.h"
+#include "clang/AST/Type.h"
+using namespace clang;
+
+#include "clang/AST/AttrImpl.inc"