--- a/hgext/fastannotate/context.py	Sun Oct 06 14:51:45 2019 -0400
+++ b/hgext/fastannotate/context.py	Sun Oct 06 14:58:42 2019 -0400
@@ -13,7 +13,10 @@
 import os
 
 from mercurial.i18n import _
-from mercurial.pycompat import open
+from mercurial.pycompat import (
+    open,
+    setattr,
+)
 from mercurial import (
     error,
     linelog as linelogmod,