Help Needed! expecting (, found 'Chop'.

Yeah, like said above this is the error: BCE0044: expecting (, found 'Chop'.

this is my script:

 #pragma strict
 
 var rayLength : int = 10;
 
 var treeScript : TreeController;
 var playerAnim : PlayerControl;
 
 function Update()
 {
     var hit : RaycastHit;
     var fwd = transform.TransformDirection(Vector3.forward);
     
     if(Physics.Raycast(transform.position, fwd, hit, rayLength))
     {
         if(hit.collider.gameObject.tag == "Tree")
         {
             treeScript = GameObject.Find(hit.collider.gameObject.name).GetComponent(TreeController);
             playerAnim = GameObject.Find("Arms05").GetComponent(PlayerControl);    
             
             if(Input.GetButtonDown("Fire1"))
             {
                 StopCoroutine("Chop");
                 StartCoroutine("Chop");
             }    
         }    
         
     function Chop ();
         {    
             yield WaitForSeconds(2);
             treeScript.treeHealth -= 1;
         }
     }
 }

It's probably sometime quite simple, but please tell me what I am doing wrong, or if there are any other errors in the script. Thanks!