Iavor Diatchki wrote:
- option 3: GHC 6.6 style rank-N types. This one I am less familiar
with but here is my understanding:
* Based on "Boxy types: type inference for higher-rank types and
impredicativity"
* Impredicative (type variables may be bound to schemes)
* Sometimes we compare schemes for equality (this is
demonstrated by the example on ticket 57) and we also use the
sub-typing by generality on schemes
* Again, function types are special
It's buggy in GHC 6.6, see
<http://hackage.haskell.org/trac/ghc/ticket/1123>.
--
Ashley Yakeley
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