--- a/mercurial/dirstate.py	Mon Aug 29 17:48:14 2016 -0700
+++ b/mercurial/dirstate.py	Tue Aug 30 09:22:53 2016 -0700
@@ -227,7 +227,7 @@
 
     @propertycache
     def _checkcase(self):
-        return not util.checkcase(self._join('.hg'))
+        return not util.fscasesensitive(self._join('.hg'))
 
     def _join(self, f):
         # much faster than os.path.join()