diff -r d2fff292c265 -r 290f9c150f70 mercurial/patch.py
--- a/mercurial/patch.py	Mon Dec 13 19:34:06 2021 -0500
+++ b/mercurial/patch.py	Mon Dec 13 20:19:09 2021 -0500
@@ -109,7 +109,9 @@
     def mimesplit(stream, cur):
         def msgfp(m):
             fp = stringio()
+            # pytype: disable=wrong-arg-types
             g = mail.Generator(fp, mangle_from_=False)
+            # pytype: enable=wrong-arg-types
             g.flatten(m)
             fp.seek(0)
             return fp