title: Why an instance field cannot be passed to a superclass?
body: <pre class="lang-dart prettyprint-override"><code>class A {
    A(int a);
  }
  
  class B extends A {
    final int b;
  
    B(int passed)
        : b = passed * 10,
          super(b); // Error
  }
  </code></pre>
  <p>How can I pass <code>b</code> value to the superclass constructor?</p>