diff -r f99d64e8a4e4 -r f0b6fbea00cf mercurial/simplemerge.py
--- a/mercurial/simplemerge.py	Thu Mar 22 21:19:31 2018 +0900
+++ b/mercurial/simplemerge.py	Thu Mar 22 21:56:20 2018 +0900
@@ -23,7 +23,9 @@
     error,
     mdiff,
     pycompat,
-    util,
+)
+from .utils import (
+    stringutil,
 )
 
 class CantReprocessAndShowBase(Exception):
@@ -397,7 +399,7 @@
 def _verifytext(text, path, ui, opts):
     """verifies that text is non-binary (unless opts[text] is passed,
     then we just warn)"""
-    if util.binary(text):
+    if stringutil.binary(text):
         msg = _("%s looks like a binary file.") % path
         if not opts.get('quiet'):
             ui.warn(_('warning: %s\n') % msg)