diff -r defabf63e969 -r 8ff1ecfadcd1 mercurial/pycompat.py
--- a/mercurial/pycompat.py	Tue Oct 08 15:15:37 2019 -0700
+++ b/mercurial/pycompat.py	Tue Oct 08 15:06:18 2019 -0700
@@ -361,7 +361,7 @@
     setattr = setattr
 
     # this can't be parsed on Python 3
-    exec(b'def raisewithtb(exc, tb):\n' b'    raise exc, None, tb\n')
+    exec(b'def raisewithtb(exc, tb):\n    raise exc, None, tb\n')
 
     def fsencode(filename):
         """