diff -r efeeb73f54c3 -r 1419ba5e3b56 mercurial/utils/stringutil.py
--- a/mercurial/utils/stringutil.py	Fri Aug 10 03:14:52 2018 -0400
+++ b/mercurial/utils/stringutil.py	Fri Aug 10 03:16:02 2018 -0400
@@ -427,6 +427,8 @@
     return encoding.trim(text, maxlength, ellipsis='...')
 
 def escapestr(s):
+    if isinstance(s, memoryview):
+        s = bytes(s)
     # call underlying function of s.encode('string_escape') directly for
     # Python 3 compatibility
     return codecs.escape_encode(s)[0]