diff -r 75e753a26806 -r 9087513df412 mercurial/context.py
--- a/mercurial/context.py	Tue Jan 15 16:55:20 2019 -0800
+++ b/mercurial/context.py	Mon Jan 21 13:45:12 2019 -0800
@@ -2178,8 +2178,6 @@
     """
     def getfilectx(repo, memctx, path):
         fctx = ctx[path]
-        # this is weird but apparently we only keep track of one parent
-        # (why not only store that instead of a tuple?)
         copied = fctx.renamed()
         if copied:
             copied = copied[0]