title: file viewController.swift is part of module "coreData" ignoring import
body: <p>I tried to import CoreData and it came up with a warning "file viewController.swift is part of module "coreData" ignoring import"
  <a href="https://i.stack.imgur.com/PJcV2.png" rel="noreferrer">A Screen Shot</a></p>
  
  <pre><code>import UIKit
  import CoreData
  
  class ViewController: UIViewController {
  
      override func viewDidLoad() {
          super.viewDidLoad()
          // Do any additional setup after loading the view, typically from a nib.
      }
  
      override func didReceiveMemoryWarning() {
          super.didReceiveMemoryWarning()
          // Dispose of any resources that can be recreated.
      }
  
  
  }
  </code></pre>