diff -r 421ea5772039 -r be8552f25cab mercurial/windows.py
--- a/mercurial/windows.py	Wed Nov 13 20:42:13 2019 +0100
+++ b/mercurial/windows.py	Sun Dec 01 18:46:10 2019 -0500
@@ -507,7 +507,7 @@
         pathexts = [b'']
 
     def findexisting(pathcommand):
-        b'Will append extension (if needed) and return existing file'
+        """Will append extension (if needed) and return existing file"""
         for ext in pathexts:
             executable = pathcommand + ext
             if os.path.exists(executable):