error from generated code of super calls

[sigmundch]

I am not using chrome canary, but Chrome 42 with the ES6 flags, so maybe that's the reason behind the issue I run into. Basically I get this error if I open the existing sunflower.html:

Uncaught TypeError: A 'super' constructor call may only appear as the first statement of a function, and its arguments may not access 'this'. Other forms are not yet supported.

which seems to come from here:

  class SunflowerSeed extends dart.mixin(Circle, CirclePainter) {
    constructor(x, y, radius, color) {
      if (color === undefined) color = null;
      super(x, y, radius);
      if (color !== null) this.color = color;
    }
  }

[jmesserly]

canary hits this one:

    constructor() {
      this.color = ORANGE;
      super();
    }

we'll have to track down what changed ... seems really unfortunate. But in the meantime, we can put in a workaround.

[jmesserly]

it looks like we're catching up to https://codereview.chromium.org/766663003
fwiw, the tracking bug for classes https://code.google.com/p/v8/issues/detail?id=3330