BCE0034 Expressions in statements must only be executed for their side-effect

Unity Engine
1

Hi i have a problem with my script : can some1 help me ? Thanks.

var target; Transform;
function Update () {
}
function OnTriggerEnter(col)
{
Collider;

if(col.gameObject.tag == “teleport”) {
this.transform.position = target.position;
}
}

2 
function OnTriggerEnter(col)
{
Collider;

should be

function OnTriggerEnter(col : Collider)
{
3

Thank you for your speed answer and now it’s working ^^