I'm getting "Unexpected OPTLINK Termination at EIP = 000000000 and assembly register values" when compiling the follow code. I'm doing something wrong?

class MyClass
{
  void opCall()
  {
  }
}

public void main(string[] arguments)
{
    MyClass clazz = new MyClass();
    TaskPool pool = new TaskPool();

    pool.put(std.parallelism.task(&clazz.opCall));
}