[Haskell] Types of when and unless in Control.Monad

[Dan Burton]

>
> > P.S.:  A more systematic solution would be to change the Haskell
> > language by either introducing a Top type which is the supertype of
> > everything and use it instead of ().
>

Haskell doesn't have subtyping, so this wouldn't really make sense. Perhaps
a typeclass Top would make sense (where the compiler automatically creates
an instance of it for all types), but then `Top a => a` would be equivalent
to just `a`, so it wouldn't really serve any purpose.
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