--- a/mercurial/cffi/mpatch.py	Tue Nov 08 13:59:16 2022 -0500
+++ b/mercurial/cffi/mpatch.py	Tue Nov 08 14:17:56 2022 -0500
@@ -6,6 +6,8 @@
 # GNU General Public License version 2 or any later version.
 
 
+from typing import List
+
 from ..pure.mpatch import *
 from ..pure.mpatch import mpatchError  # silence pyflakes
 from . import _mpatch  # pytype: disable=import-error
@@ -26,7 +28,7 @@
     return container[0]
 
 
-def patches(text, bins):
+def patches(text: bytes, bins: List[bytes]) -> bytes:
     lgt = len(bins)
     all = []
     if not lgt: