--- Comment #4 from Walter Bright <> 2012-06-14 
00:39:47 PDT ---
(In reply to comment #3)
> typeof(null) is a subtype of array/class/pointer types. By return type
> covariance rule, should be able to override

Since A is not a base class of null, I do not think this is valid. foo could
return B, and that will work, because A is a base class of B.

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