--- a/util/async.lua	Tue Aug 13 21:26:53 2013 +0100
+++ b/util/async.lua	Tue Aug 13 23:38:50 2013 +0100
@@ -43,7 +43,7 @@
 	end;
 end
 
-function guarder()
+local function guarder()
 	local guards = {};
 	return function (id, func)
 		local thread = coroutine.running();