I can't figure out how to fix an "Expressions in statements must only be executed for their side-effects." problem.

So I'm trying to modify a pre made script so that when animations play the distance between the camera and the player change. But I'm almost done I think and I'm getting "Expressions in statements must only be executed for their side-effects." Here's the part I'm inserting into the script. (Yeah I'm new to Java script so sorry if this is really obvious to come of you.):

 function PoTra ()
 {
     controller = GetComponent(ThirdPersonController);
     if (controller.Animation["Run"].enabled ==true)
         {
          for(var i = 7.0;i <=9.0;i+0.2)
          controller.ThirdPersonCamera.distance=i;
          Debug.log(i);
          }
 }

Here's the whole thing (encase it's necessary for something)

 var cameraTransform : Transform;
 private var _target : Transform;
 
 // The distance in the x-z plane to the target
 
 var distance = 5.0;
 
 // the height we want the camera to be above the target
 var height = 3.0;
 
 var angularSmoothLag = 0.3;
 var angularMaxSpeed = 15.0;
 
 var heightSmoothLag = 0.3;
 
 var snapSmoothLag = 0.2;
 var snapMaxSpeed = 720.0;
 
 var clampHeadPositionScreenSpace = 0.75;
 
 var lockCameraTimeout = 0.2;
 
 private var headOffset = Vector3.zero;
 private var centerOffset = Vector3.zero;
 
 private var heightVelocity = 0.0;
 private var angleVelocity = 0.0;
 private var snap = false;
 private var controller : ThirdPersonController;
 private var targetHeight = 100000.0; 
 
 function Awake ()
 {
     if(!cameraTransform && Camera.main)
         cameraTransform = Camera.main.transform;
     if(!cameraTransform) {
         Debug.Log("Please assign a camera to the ThirdPersonCamera script.");
         enabled = false;    
     }
             
         
     _target = transform;
     if (_target)
     {
         controller = _target.GetComponent(ThirdPersonController);
     }
     
     if (controller)
     {
         var characterController : CharacterController = _target.collider;
         centerOffset = characterController.bounds.center - _target.position;
         headOffset = centerOffset;
         headOffset.y = characterController.bounds.max.y - _target.position.y;
     }
     else
         Debug.Log("Please assign a target to the camera that has a ThirdPersonController script attached.");
 
     
     Cut(_target, centerOffset);
 }
 
 function DebugDrawStuff ()
 {
     Debug.DrawLine(_target.position, _target.position + headOffset);
 
 }
 
 function AngleDistance (a : float, b : float)
 {
     a = Mathf.Repeat(a, 360);
     b = Mathf.Repeat(b, 360);
     
     return Mathf.Abs(b - a);
 }
 
 function Apply (dummyTarget : Transform, dummyCenter : Vector3)
 {
     // Early out if we don't have a target
     if (!controller)
         return;
     
     var targetCenter = _target.position + centerOffset;
     var targetHead = _target.position + headOffset;
 
 //    DebugDrawStuff();
 
     // Calculate the current & target rotation angles
     var originalTargetAngle = _target.eulerAngles.y;
     var currentAngle = cameraTransform.eulerAngles.y;
 
     // Adjust real target angle when camera is locked
     var targetAngle = originalTargetAngle; 
     
     // When pressing Fire2 (alt) the camera will snap to the target direction real quick.
     // It will stop snapping when it reaches the target
     if (Input.GetButton("Fire2"))
         snap = true;
     
     if (snap)
     {
         // We are close to the target, so we can stop snapping now!
         if (AngleDistance (currentAngle, originalTargetAngle) < 3.0)
             snap = false;
         
         currentAngle = Mathf.SmoothDampAngle(currentAngle, targetAngle, angleVelocity, snapSmoothLag, snapMaxSpeed);
     }
     // Normal camera motion
     else
     {
         if (controller.GetLockCameraTimer () < lockCameraTimeout)
         {
             targetAngle = currentAngle;
         }
 
         // Lock the camera when moving backwards!
         // * It is really confusing to do 180 degree spins when turning around.
         if (AngleDistance (currentAngle, targetAngle) > 160 && controller.IsMovingBackwards ())
             targetAngle += 180;
 
         currentAngle = Mathf.SmoothDampAngle(currentAngle, targetAngle, angleVelocity, angularSmoothLag, angularMaxSpeed);
     }
 
 
     // When jumping don't move camera upwards but only down!
     if (controller.IsJumping ())
     {
         // We'd be moving the camera upwards, do that only if it's really high
         var newTargetHeight = targetCenter.y + height;
         if (newTargetHeight < targetHeight || newTargetHeight - targetHeight > 5)
             targetHeight = targetCenter.y + height;
     }
     // When walking always update the target height
     else
     {
         targetHeight = targetCenter.y + height;
     }
 
     // Damp the height
     var currentHeight = cameraTransform.position.y;
     currentHeight = Mathf.SmoothDamp (currentHeight, targetHeight, heightVelocity, heightSmoothLag);
 
     // Convert the angle into a rotation, by which we then reposition the camera
     var currentRotation = Quaternion.Euler (0, currentAngle, 0);
     
     // Set the position of the camera on the x-z plane to:
     // distance meters behind the target
     cameraTransform.position = targetCenter;
     cameraTransform.position += currentRotation * Vector3.back * distance;
 
     // Set the height of the camera
     cameraTransform.position.y = currentHeight;
     
     // Always look at the target    
     SetUpRotation(targetCenter, targetHead);
 }
 
 function LateUpdate () {
     Apply (transform, Vector3.zero);
 }
 
 function Cut (dummyTarget : Transform, dummyCenter : Vector3)
 {
     var oldHeightSmooth = heightSmoothLag;
     var oldSnapMaxSpeed = snapMaxSpeed;
     var oldSnapSmooth = snapSmoothLag;
     
     snapMaxSpeed = 10000;
     snapSmoothLag = 0.001;
     heightSmoothLag = 0.001;
     
     snap = true;
     Apply (transform, Vector3.zero);
     
     heightSmoothLag = oldHeightSmooth;
     snapMaxSpeed = oldSnapMaxSpeed;
     snapSmoothLag = oldSnapSmooth;
 }
 
 function SetUpRotation (centerPos : Vector3, headPos : Vector3)
 {
     // Now it's getting hairy. The devil is in the details here, the big issue is jumping of course.
     // * When jumping up and down we don't want to center the guy in screen space.
     //  This is important to give a feel for how high you jump and avoiding large camera movements.
     //   
     // * At the same time we dont want him to ever go out of screen and we want all rotations to be totally smooth.
     //
     // So here is what we will do:
     //
     // 1. We first find the rotation around the y axis. Thus he is always centered on the y-axis
     // 2. When grounded we make him be centered
     // 3. When jumping we keep the camera rotation but rotate the camera to get him back into view if his head is above some threshold
     // 4. When landing we smoothly interpolate towards centering him on screen
     var cameraPos = cameraTransform.position;
     var offsetToCenter = centerPos - cameraPos;
     
     // Generate base rotation only around y-axis
     var yRotation = Quaternion.LookRotation(Vector3(offsetToCenter.x, 0, offsetToCenter.z));
 
     var relativeOffset = Vector3.forward * distance + Vector3.down * height;
     cameraTransform.rotation = yRotation * Quaternion.LookRotation(relativeOffset);
 
     // Calculate the projected center position and top position in world space
     var centerRay = cameraTransform.camera.ViewportPointToRay(Vector3(.5, 0.5, 1));
     var topRay = cameraTransform.camera.ViewportPointToRay(Vector3(.5, clampHeadPositionScreenSpace, 1));
 
     var centerRayPos = centerRay.GetPoint(distance);
     var topRayPos = topRay.GetPoint(distance);
     
     var centerToTopAngle = Vector3.Angle(centerRay.direction, topRay.direction);
     
     var heightToAngle = centerToTopAngle / (centerRayPos.y - topRayPos.y);
 
     var extraLookAngle = heightToAngle * (centerRayPos.y - centerPos.y);
     if (extraLookAngle < centerToTopAngle)
     {
         extraLookAngle = 0;
     }
     else
     {
         extraLookAngle = extraLookAngle - centerToTopAngle;
         cameraTransform.rotation *= Quaternion.Euler(-extraLookAngle, 0, 0);
     }
 }
 
 function GetCenterOffset ()
 {
     return centerOffset;
 }
 
 function PoTra ()
 {
     controller = GetComponent(ThirdPersonController);
     if (controller.Animation["Run"].enabled ==true)
         {
          for(var i = 7.0;i <=9.0;i+0.2)
          controller.ThirdPersonCamera.distance=i;
          Debug.log(i);
          }
 }

Please help D:¦