diff -r 632e07e72a22 -r f3b151278655 mercurial/revsetlang.py
--- a/mercurial/revsetlang.py	Sun Mar 26 20:58:54 2017 -0700
+++ b/mercurial/revsetlang.py	Sun Mar 26 16:48:29 2017 -0400
@@ -586,7 +586,7 @@
     >>> _quote(1)
     "'1'"
     """
-    return "'%s'" % util.escapestr('%s' % s)
+    return "'%s'" % util.escapestr(pycompat.bytestr(s))
 
 def formatspec(expr, *args):
     '''