diff -r 995003a324da -r 09049042ab99 mercurial/ui.py
--- a/mercurial/ui.py	Wed Apr 29 19:47:37 2015 +0900
+++ b/mercurial/ui.py	Thu Apr 30 07:46:54 2015 -0700
@@ -169,6 +169,9 @@
         if self.plain('alias'):
             for k, v in cfg.items('alias'):
                 del cfg['alias'][k]
+        if self.plain('revsetalias'):
+            for k, v in cfg.items('revsetalias'):
+                del cfg['revsetalias'][k]
 
         if trusted:
             self._tcfg.update(cfg)