"The moral is that you should not rely on the value of a val in the body of a constructor."
Oh Scala. 
I'm still not won over by the OO.
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Keepin it real 
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It is using early definition syntax to initialise fields of a subclass before evaluating the constructor of the superclass.
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I quite like the self type syntax myself, although I haven't had much of a chance at tying myself into knots with it yet
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