Would be nice if Defer could expose return value

DeferExposingReturnValue.swift

// We don't know the return value of this function! Makes it hard to debug!
func fetchUserByFirstName(firstName: String, andLastName lastName: String, fromContext context: NSManagedObjectContext) -> User? {
    defer {
         // Not possible, would be nice! Return value would be an implicitly declared variable
         // exaclty like the variables 'newValue' and 'oldValue' in property observers!
        print("return value: \(returnValue)")
    }

    guard !firstName.isEmpty else { print("firstName can't be empty"); return nil }
    guard !lastName.isEmpty else { print("lastName can't be empty"); return nil }
    guard firstName != "DEBUG" else { return User.debugUser }
    let fetchRequest = NSFetchRequest(entityName: Users.entityName)
    let predicate = NSPredicate(format: "firstName == \(firstName) AND lastName == \(lastName)")
    fetchRequest.predicate = predicate
    do {
        let user = try context.executeFetchRequest(fetchRequest)
        return user
    } catch let error as NSError {
        print("Error fetching user: \(error)")
    }
    return nil
}