title: scala append to a mutable LinkedList
body: <p>Please check this </p>
  
  <pre><code>import scala.collection.mutable.LinkedList
  
  var l = new LinkedList[String]
  
  l append LinkedList("abc", "asd")
  
  println(l)
  // prints 
  // LinkedList()
  </code></pre>
  
  <p>but</p>
  
  <pre><code>import scala.collection.mutable.LinkedList
  
  var l = new LinkedList[String]
  
  l = LinkedList("x")
  l append LinkedList("abc", "asd")
  
  println(l)
  // prints 
  // LinkedList(x, abc, asd)
  </code></pre>
  
  <p>Why does the second code snippet works but the first one doesnt? This is on Scala 2.10</p>