[Haskell-cafe] Hello and type-level SKI

[Brandon Allbery]

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
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