title: How to stop ´enumerateChildNodesWithName("//*") ´ enumeration?
body: <p>How do I stop this enumeration? I have the following code and Xcode complaining that I cannot assign a value to let constant. Stopping is probably a simple thing but I'm quite the noobie with Swift, so please bear with me.</p>
  
  <pre><code>self.enumerateChildNodesWithName("//*") {
          spaceshipNode, stop in
          if (( spaceshipNode.name?.hasSuffix("ship") ) != nil) {
              for enemyNode in self.children {
                  if (enemyNode.name == "enemy"){
                      if(enemyNode.containsPoint(spaceshipNode.position)){
                          self.gotoGameOverScene(spaceshipNode)
                          stop = true // Error: Cannot assign to value: 'stop' is a 'let' constant
                      }
                  }
              }
          }
      }
  </code></pre>