Function fn

test/old/tmp.js:25–35

(cb)

	return;
	function Next(){
		var fn = function(cb){
			if(!fn.stack || !fn.stack.length){
				setImmediate(function next(n){
					return (n = (fn.stack||[]).shift() || function(){}), n.back = fn.stack, fn.stack = [], n(function(){
						return (fn.stack = (fn.stack||[]).concat(n.back)), next();
					});
				});
			} if(cb){ 
				(fn.stack = fn.stack || []).push(cb);
			} return fn;
		}, setImmediate = setImmediate || function(cb){return setTimeout(cb,0)}
		return fn;
	}