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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+#include "nsISupports.idl"
+
+/**
+ * Interface for warning about deprecated operations. Consumers should
+ * attach this interface to the channel's notification callbacks/loadgroup.
+ */
+[uuid(665c5124-2c52-41ba-ae72-2393f8e76c25)]
+interface nsIDeprecationWarner : nsISupports
+{
+ /**
+ * Issue a deprecation warning.
+ *
+ * @param aWarning a warning code as declared in nsDeprecatedOperationList.h.
+ * @param aAsError optional boolean flag indicating whether the warning
+ * should be treated as an error.
+ */
+ void issueWarning(in uint32_t aWarning, [optional] in bool aAsError);
+};