Hi, On Thu, Jun 7, 2012 at 2:46 AM, AntC <anthony_clay...@clear.net.nz> wrote:
> > What does the `ArgKind' message mean? > `ArgKind` and `OpenKind` is what previously was called `?` and `??` (or the other way around; I can't remember). http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/TypeType#Kindsubtyping You might also want to have a look at Richard and Stephanie's latest paper draft, about singletons, which is related to what you are trying in your example: http://www.cis.upenn.edu/~eir/papers/2012/singletons/paper.pdf Cheers, Pedro
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