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diff --git a/third_party/python/yamllint/yamllint/rules/document_end.py b/third_party/python/yamllint/yamllint/rules/document_end.py
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+++ b/third_party/python/yamllint/yamllint/rules/document_end.py
@@ -0,0 +1,107 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2016 Adrien Vergé
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+Use this rule to require or forbid the use of document end marker (``...``).
+
+.. rubric:: Options
+
+* Set ``present`` to ``true`` when the document end marker is required, or to
+  ``false`` when it is forbidden.
+
+.. rubric:: Examples
+
+#. With ``document-end: {present: true}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    ---
+    this:
+      is: [a, document]
+    ...
+    ---
+    - this
+    - is: another one
+    ...
+
+   the following code snippet would **FAIL**:
+   ::
+
+    ---
+    this:
+      is: [a, document]
+    ---
+    - this
+    - is: another one
+    ...
+
+#. With ``document-end: {present: false}``
+
+   the following code snippet would **PASS**:
+   ::
+
+    ---
+    this:
+      is: [a, document]
+    ---
+    - this
+    - is: another one
+
+   the following code snippet would **FAIL**:
+   ::
+
+    ---
+    this:
+      is: [a, document]
+    ...
+    ---
+    - this
+    - is: another one
+"""
+
+
+import yaml
+
+from yamllint.linter import LintProblem
+
+
+ID = 'document-end'
+TYPE = 'token'
+CONF = {'present': bool}
+DEFAULT = {'present': True}
+
+
+def check(conf, token, prev, next, nextnext, context):
+    if conf['present']:
+        is_stream_end = isinstance(token, yaml.StreamEndToken)
+        is_start = isinstance(token, yaml.DocumentStartToken)
+        prev_is_end_or_stream_start = isinstance(
+            prev, (yaml.DocumentEndToken, yaml.StreamStartToken)
+        )
+
+        if is_stream_end and not prev_is_end_or_stream_start:
+            yield LintProblem(token.start_mark.line, 1,
+                              'missing document end "..."')
+        elif is_start and not prev_is_end_or_stream_start:
+            yield LintProblem(token.start_mark.line + 1, 1,
+                              'missing document end "..."')
+
+    else:
+        if isinstance(token, yaml.DocumentEndToken):
+            yield LintProblem(token.start_mark.line + 1,
+                              token.start_mark.column + 1,
+                              'found forbidden document end "..."')