(Can somebody add some content here?)
Revision as of 12:05, 9 July 2007
As best as I can tell, rank-N types are exactly like existential types - except that they're completely different.
Rank-2 types are a special case of rank-N types, and normal Haskell 98 types are all rank-1 types.
2 Also see
Rank-N types on the Haskell' website.