class Node {
 public var next:Node
 public function foo():void {
 }
}

//...

for(var l:int = 0; l < loop; ++l) {
 var node:Node=v[l] as Node
 node=node.next
}

for(var l:int = 0; l < loop; ++l) {
 var node:Node=v[l] as Node
 node.foo()
}