--- a/mercurial/patch.py	Thu Feb 02 17:32:38 2023 +0100
+++ b/mercurial/patch.py	Thu Feb 02 17:33:56 2023 +0100
@@ -168,7 +168,7 @@
 
     mimeheaders = [b'content-type']
 
-    if not util.safehasattr(stream, b'next'):
+    if not util.safehasattr(stream, 'next'):
         # http responses, for example, have readline but not next
         stream = fiter(stream)