A type checker plugin for row types

Nicolas Frisby nicolas.frisby at gmail.com
Sun Sep 10 22:58:45 UTC 2017

Whoops! I forgot about that section of my draft. I added a little blurb
("Performance?") Thanks Ara!

On Sun, Sep 10, 2017 at 3:41 PM Ara Adkins <me at ara.io> wrote:

> Just given this a read!
> It looks like you’ve put a fantastic amount of effort into this so far,
> and I can certainly see how it’s finding its legs! I’m very much looking
> forward to seeing this develop further. I can definitely foresee some uses
> for polykinded column types, and the possibility for named arguments is
> certainly interesting (though I have some concerns about performance —
> though none are relevant at such an early stage).
> Unfortunately I don’t think I can answer any of the questions that I
> spotted on my read-through.
> Again, I’m looking forward to seeing this develop, and the naming of
> `coxswain` and `sculls` gave me a giggle.
> _ara
> On 10 Sep 2017, at 23:24, Nicolas Frisby <nicolas.frisby at gmail.com> wrote:
> Hi all. I've been spending my free time for the last couple months on a
> type checker plugin for row types. The free time waxes and wanes; sending
> an email like this one was my primary goal for the past couple weeks.
> At the very least, I hoped this project would let me finally get some
> hands on experience with OutsideIn. And I definitely have. But I've also
> made more progress than I anticipated, and I think the plugin is starting
> to have legs!
> I haven't uploaded the code yet to github -- it's not quite ready to
> share. But I did do a write up on the dev wiki.
> https://ghc.haskell.org/trac/ghc/wiki/Plugins/TypeChecker/RowTypes/Coxswain
> I would really appreciate and questions, comments, and --- boy, oh boy ---
> answers.
> I hope to upload within a week or so, and I'll update that wiki page and
> reply to this email when I do.
> Thanks very much. -Nick
> P.S. -- I've CC'd and BCC'd people who I anticipate would be specifically
> interested in this (e.g. plugins, row types, etc). Please feel free to
> forward to others that come to mind; I know some inboxes abjectly can't
> afford default list traffic.
> P.P.S. -- One hold up for the upload is: which license? I intend to
> release under BSD3, mainly to match GHC since one ideal scenario would
> involve being packaged with/integrated into GHC. But my brief recent
> research suggests that the Apache license might be more conducive to
> eventual widespread adoption. If you'd be willing to advise or even just
> refer me to other write ups, please feel free to email me directly or to
> start a separate thread on a more appropriate distribution list (CC'ing me,
> please). Thanks again.
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