title: Scala Puzzle : Any ideas on how to make this work?
body: <p>This code doesn't work!</p>
  
  <pre><code>def add(a: Int, b: Int): Int = a plus b
  </code></pre>
  
  <p>So, I tried defining <code>plus</code> like so:</p>
  
  <pre><code>def plus(a: Int, b: Int): Int = a + b
  </code></pre>
  
  <p>But, the compiler still complains <code>Cannot resolve symbol plus</code>!</p>
  
  <p>Any ideas?</p>