diff -r 0f36926b2651 -r ddd9474d2e08 mercurial/scmutil.py
--- a/mercurial/scmutil.py	Wed Feb 21 00:25:16 2018 +0530
+++ b/mercurial/scmutil.py	Tue Feb 06 08:48:05 2018 -0800
@@ -357,12 +357,8 @@
     samestat = getattr(os.path, 'samestat', None)
     if followsym and samestat is not None:
         def adddir(dirlst, dirname):
-            match = False
             dirstat = os.stat(dirname)
-            for lstdirstat in dirlst:
-                if samestat(dirstat, lstdirstat):
-                    match = True
-                    break
+            match = any(samestat(dirstat, lstdirstat) for lstdirstat in dirlst)
             if not match:
                 dirlst.append(dirstat)
             return not match