title: Where is function definition of kotlin plus operator?
body: <p>I was just looking into the source code of Primitives.kt file in kotlin source to see the function code for 'plus' operator.</p>
  
  <pre><code>/** Adds the other value to this value. */
  public operator fun plus(other: Int): Int
  </code></pre>
  
  <p>Can someone help me guide where is the code for this function ?</p>