[Haskell-cafe] Hello and type-level SKI
Tikhon Jelvis
tikhon at jelv.is
Fri Sep 12 23:46:20 UTC 2014
Note how the provided code enables a bunch of language extensions, most
notably UndecidableInstances. (Yep, that's exactly what it sounds like!)
It's quite far removed from standard Haskell or full type inference.
On Sep 12, 2014 4:30 PM, "Brandon Allbery" <allbery.b at gmail.com> wrote:
> On Fri, Sep 12, 2014 at 7:25 PM, Jay Sulzberger <jays at panix.com> wrote:
>
>> But this is impossible! The type system of Haskell can be
>> handled by a Hindley-Milner-Damas style type checker. Such a
>> type checker always comes to a halt with a Yea or Nay answer. So
>> one cannot get a simulation of the combinators S, K, I inside the
>> Haskell type system.
>>
>> What have I misunderstood? And, in case GHC really does now
>> handle stuff beyond the HMD horizon, what does the New Core
>> language look like?
>>
>
> Standard Haskell is (or was) H-M extended with typeclasses. GHC moved
> beyond that years ago; internally it's System Fw (
> http://en.wikipedia.org/wiki/System_F#System_F.CF.89), and its Core
> language reflects this.
>
> --
> brandon s allbery kf8nh sine nomine
> associates
> allbery.b at gmail.com
> ballbery at sinenomine.net
> unix, openafs, kerberos, infrastructure, xmonad
> http://sinenomine.net
>
> _______________________________________________
> Haskell-Cafe mailing list
> Haskell-Cafe at haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.haskell.org/pipermail/haskell-cafe/attachments/20140912/8b451e11/attachment.html>
More information about the Haskell-Cafe
mailing list