michael rice wrote on 19.05.2009 18:16:
Cool! Is there *anything* Haskell *can't* do?
Well, I haven't found a way to emulate polymorphics kinds yet, and I feel like I need them. Other than than - probably no.
Michael --- On *Mon, 5/18/09, David Menendez /<d...@zednenem.com>/* wrote: From: David Menendez <d...@zednenem.com> Subject: Re: [Haskell-cafe] showing a user defined type To: "Ryan Ingram" <ryani.s...@gmail.com> Cc: haskell-cafe@haskell.org Date: Monday, May 18, 2009, 10:26 PM On Mon, May 18, 2009 at 10:02 PM, Ryan Ingram <ryani.s...@gmail.com </mc/compose?to=ryani.s...@gmail.com>> wrote: > Unfortunately, you can't derive Show on Chain as defined, because it > contains a function: Sure you can. I just tried the following, and it compiled without complaints. > import Text.Show.Functions > > data Chain = Link Int (Int -> Chain) deriving (Show) The usual warnings about orphan instances apply, but the purpose of the Text.Show.Functions module is to provide a standard Show instance for functions so that libraries (e.g., QuickCheck) don't declare conflicting instances.-- Dave Menendez <d...@zednenem.com </mc/compose?to=d...@zednenem.com>><http://www.eyrie.org/~zednenem/ <http://www.eyrie.org/%7Ezednenem/>> _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org </mc/compose?to=haskell-c...@haskell.org> http://www.haskell.org/mailman/listinfo/haskell-cafe ------------------------------------------------------------------------ _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
