--- a/mercurial/match.py	Sun Oct 06 13:17:19 2019 -0400
+++ b/mercurial/match.py	Sun Oct 06 13:28:56 2019 -0400
@@ -13,6 +13,7 @@
 import re
 
 from .i18n import _
+from .pycompat import open
 from . import (
     encoding,
     error,