--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgext/fastannotate/error.py	Mon Jul 30 22:50:00 2018 -0400
@@ -0,0 +1,13 @@
+# Copyright 2016-present Facebook. All Rights Reserved.
+#
+# error: errors used in fastannotate
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+from __future__ import absolute_import
+
+class CorruptedFileError(Exception):
+    pass
+
+class CannotReuseError(Exception):
+    """cannot reuse or update the cache incrementally"""