--- a/mercurial/context.py	Sun Jan 13 20:13:22 2019 -0500
+++ b/mercurial/context.py	Wed Feb 20 19:28:51 2019 -0500
@@ -983,9 +983,9 @@
 
         assert (changeid is not None
                 or fileid is not None
-                or changectx is not None), \
-                ("bad args: changeid=%r, fileid=%r, changectx=%r"
-                 % (changeid, fileid, changectx))
+                or changectx is not None), (
+                    "bad args: changeid=%r, fileid=%r, changectx=%r"
+                    % (changeid, fileid, changectx))
 
         if filelog is not None:
             self._filelog = filelog