Re: Question about using higher order polymorphism.

My question is, in which version of Haskell can I use higher order polymorphism features (including first class polymorphic and first class existential types), and how to use them (what's the syntax).

for ghc, check this: http://www.haskell.org/ghc/docs/latest/html/users_guide/type-extensions.html (i think) most of this is implemented in hugs as well. with ghc, you need `ghc -fglasgow-exts', with hugs, use `hugs -98'. -- -- Johannes Waldmann ---- http://www.informatik.uni-leipzig.de/~joe/ -- -- joe@informatik.uni-leipzig.de -- phone/fax (+49) 341 9732 204/207 --