--- a/mercurial/vfs.py	Thu Sep 06 18:30:12 2018 -0700
+++ b/mercurial/vfs.py	Tue Sep 04 15:55:23 2018 -0700
@@ -213,6 +213,10 @@
         """
         return util.removedirs(self.join(path))
 
+    def rmdir(self, path=None):
+        """Remove an empty directory."""
+        return os.rmdir(self.join(path))
+
     def rmtree(self, path=None, ignore_errors=False, forcibly=False):
         """Remove a directory tree recursively