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diff --git a/tools/closure_linter-2.3.4/closure_linter/common/error.py b/tools/closure_linter-2.3.4/closure_linter/common/error.py
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+++ b/tools/closure_linter-2.3.4/closure_linter/common/error.py
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+#!/usr/bin/env python
+#
+# Copyright 2007 The Closure Linter Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS-IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Error object commonly used in linters."""
+
+__author__ = ('robbyw@google.com (Robert Walker)',
+              'ajp@google.com (Andy Perelson)')
+
+
+class Error(object):
+  """Object representing a style error."""
+
+  def __init__(self, code, message, token, position, fix_data):
+    """Initialize the error object.
+
+    Args:
+      code: The numeric error code.
+      message: The error message string.
+      token: The tokens.Token where the error occurred.
+      position: The position of the error within the token.
+      fix_data: Data to be used in autofixing.  Codes with fix_data are:
+          GOOG_REQUIRES_NOT_ALPHABETIZED - List of string value tokens that are
+          class names in goog.requires calls.
+    """
+    self.code = code
+    self.message = message
+    self.token = token
+    self.position = position
+    if token:
+      self.start_index = token.start_index
+    else:
+      self.start_index = 0
+    self.fix_data = fix_data
+    if self.position:
+      self.start_index += self.position.start
+
+  def Compare(a, b):
+    """Compare two error objects, by source code order.
+
+    Args:
+      a: First error object.
+      b: Second error object.
+
+    Returns:
+      A Negative/0/Positive number when a is before/the same as/after b.
+    """
+    line_diff = a.token.line_number - b.token.line_number
+    if line_diff:
+      return line_diff
+
+    return a.start_index - b.start_index
+  Compare = staticmethod(Compare)