title: Vala: calling super class creation method at constructor
body: <p>I have been trying to initialize a parent class using it's creation method. </p>
  
  <pre><code>class A {
      public A.creator (int x, int y) {
          // do some magic
      }
  }
  
  class B : A {
      public B.creator (int x, int y) {
          // I want to do something like
          base.creator (x, y);
      }
  }
  </code></pre>
  
  <p>I am facing an error while trying to run the above code.</p>
  
  <p><code>error: chain up to 'A.creator' not supported</code></p>
  
  <p>What's the correct way to accomplish this in vala?</p>