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diff --git a/mfbt/HelperMacros.h b/mfbt/HelperMacros.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* MOZ_STRINGIFY Macros */
+
+#ifndef mozilla_HelperMacros_h
+#define mozilla_HelperMacros_h
+
+// Wraps x in quotes without expanding a macro name
+#define MOZ_STRINGIFY_NO_EXPANSION(x) #x
+
+// Wraps x in quotes; expanding x if it as a macro name
+#define MOZ_STRINGIFY(x) MOZ_STRINGIFY_NO_EXPANSION(x)
+
+#endif // mozilla_HelperMacros_h