Open Radar

 
Summary:
The error "Cannot invoke 'fetch' with an argument list of type '(NSFetchRequest<NSFetchRequestResult>)' Expected an argument list of type '(NSFetchRequest<NSFetchRequestResult>)'" is displayed for the following code:

func objects(entityName name:String)->[NSManagedObject]? {   
  let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName:name)
  var objects: [NSManagedObject]?
  do {
    objects = try managedObjectContext.fetch(fetchRequest)
  } catch { ... }
}


This is the incorrect error for line 5

Steps to Reproduce:
1. Write the above Swift 3 code.
2. Attempt to compile
3. Receive the error

Expected Results:
The correct error should state that managedObjectContext.fetch() returns [Any], which needs a downcast to be assigned to [NSManagedObject]?

The correct code is objects = try managedObjectContext.fetch(fetchRequest) as? [NSManagedObject]

Actual Results:
XCode displays the following error:
Cannot invoke 'fetch' with an argument list of type '(NSFetchRequest<NSFetchRequestResult>)' Expected an argument list of type '(NSFetchRequest<NSFetchRequestResult>)'

Version:
XCode Version 8.0 (8A218a)
OS X 10.11.6 (15G1004)