diff -r b864f4536ca8 -r 68026dd7c4f9 mercurial/mdiff.py
--- a/mercurial/mdiff.py	Sat Mar 03 11:19:43 2018 -0500
+++ b/mercurial/mdiff.py	Sat Mar 03 11:26:30 2018 -0500
@@ -30,17 +30,9 @@
 fixws = bdiff.fixws
 patches = mpatch.patches
 patchedsize = mpatch.patchedsize
-_textdiff = bdiff.bdiff
+textdiff = bdiff.bdiff
 splitnewlines = bdiff.splitnewlines
 
-# On Python 3, util.buffer() creates a memoryview, which appears not
-# supporting the buffer protocol
-if pycompat.ispy3:
-    def textdiff(a, b):
-        return _textdiff(bytes(a), bytes(b))
-else:
-    textdiff = _textdiff
-
 class diffopts(object):
     '''context is the number of context lines
     text treats all files as text