mercurial/vfs.py

--- a/mercurial/vfs.py	Sat Sep 29 02:02:35 2018 -0400
+++ b/mercurial/vfs.py	Tue Sep 25 21:16:12 2018 -0400
@@ -206,7 +206,7 @@
         return util.rename(srcpath, dstpath)
 
     def readlink(self, path):
-        return os.readlink(self.join(path))
+        return util.readlink(self.join(path))
 
     def removedirs(self, path=None):
         """Remove a leaf directory and all empty intermediate ones