class Elf is Character {
  ...
}

class Drow is Elf {
  ...
}

class Human is Character {
  ...
}

##</code><code>##

class Thief is Profession {
  ...
}

my Elf $elf .= new(Thief.new);

##</code><code>##

class Elf is Character {
  has $:profession;

  method new(Class $class: Profession $profession) {
    $:profession = $profession;
    # how the heck do I access the instance from within new()? 
    $profession.race($_); # certainly incorrect syntax
  }
  ...
}

##</code><code>##

class Elf is Character does Infravision {
  ...
}

class Gnome is Character does Infravision {
  ...
}