--- a/util/throttle.lua	Mon Nov 21 19:59:38 2011 +0500
+++ b/util/throttle.lua	Fri Jan 13 23:30:00 2012 +0000
@@ -1,5 +1,6 @@
 
 local gettime = require "socket".gettime;
+local setmetatable = setmetatable;
 
 module "throttle"