What do I get this error message for?Unexpected symbol gameObject

This code is assigned to a cube.

 using UnityEngine;
 using System.Collections;
 
 public class RotateScript: MonoBehaviour 
 {
     
     private Transform fromr;
     private Transform to;
     private float rotationSpeed;
     
     // Use this for initialization
     void Start()
     {
         fromr.rotation = Quaternion.identity;
         to.rotation = Quaternion.Euler( new Vector3(0, 0, 90));
         rotationSpeed = 10f;
     }
     
     // Update is called once per frame
     void Update()
     {
         if(Input.GetKey(KeyCode.A)
             gameObject.transform.rotation = Quaternion.Slerp(fromr.rotation, to.rotation, rotationSpeed);
     } 
 
 }