--- Comment #32 from Stewart Gordon <> 2012-05-04 10:38:33 PDT ---
(In reply to comment #30)
> fizzbuzz() clearly has a bug. It will fail if given an A which isn't actually 
> a
> B.

Exactly.  fizzbuzz is calling a method of A, not a method of B.  As such, as
I've already said, it must conform to A's API, but it is failing to do so.

(In reply to comment #31)
> I understand the distinction, and how the slides doesn't make it clear that 
> the
> precondition is dynamically bound. In fact the author found it so obvious as 
> to
> be unnecessary to mention

So it could have been just an oversight for all we know.

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