Variables not showing in Inspector

This is all I have at the moment - just the variables - everything that I'm (badly) working on is commented out and the variables still don't show in the inspector. There's no error messages coming up for any of the scripts used in the application I'm creating.

I currently can not select Bullet or a camera in the inspector. Any reason why?

 function Update () {
 var hit: RaycastHit;
 var camera : Camera;
 var ray: Ray = camera.ScreenPointToRay(Input.mousePosition);
 var Bullet: GameObject;
 
 //if (Physics.Raycast(ray, hit)) {
 //    var objectHit: Transform = hit.transform;
 //    var cube = GameObject.CreatePrimitive(PrimitiveType.Cube);
 //            cube.AddComponent.<Rigidbody>();
 //    Instantiate(cube, ray.origin, Quaternion.identity);       
 //}
 
 }