Is there any deep reason why I can't write a polymorphic type in a context? I
think the record update problem can be (sort of) solved if you could write:
class Has r Rev (forall a. [a] -> [a]) => HRClass r where
setHRClass :: (forall a.[a] -> [a]) -> r -> r
but polymorphic types are not allowed in contexts. Is this one of the problems
SPJ considers "Hard" or is it a feasible extension?
Barney.
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