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lang-hs
DataKinds, if you then define adata Foo = Foo Natfor example, you can define a typetype Bar = Foo 42, andBarhas kindFoo.*kind (also known asType) the kinds* -> * -> *and(* -> *) -> *wouldn't be the same.Natis for example a kind that allows to use natural numbers as kind.MaybeT, have kind(* -> *) -> * -> *.