From: Gabriel Scherer <gabriel.scherer@gmail.com>
To: Lukasz Stafiniak <lukstafi@gmail.com>
Cc: "Milan Stanojević" <milanst@gmail.com>, Caml <caml-list@inria.fr>
Subject: Re: [Caml-list] GADT definition
Date: Fri, 20 Dec 2013 00:10:44 +0100 [thread overview]
Message-ID: <CAPFanBH1nNsaqDQZDkBEY_9=iEM2i=n0wUeFYFBfp2VC8hzsaA@mail.gmail.com> (raw)
In-Reply-To: <CAJMfKEXQFwGX=L0tbXuUdhqV00j83Ye80+SiBhJZ+TWAZFbcQQ@mail.gmail.com>
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type z
type _ s
Don't use this kind of abstract type definition. Use instead (and export)
concrete definitions (even if you don't use their constructors for anything)
type 'a s = S of 'a
(or just type 'a s = S)
They have "better" injectivity properties. We've mentioned in on the
mailing-list a couple of time, and it's also the "easy take-away lesson"
from Jacques Garrigue talk at the OCaml workshop in September.
On Thu, Dec 19, 2013 at 11:35 PM, Lukasz Stafiniak <lukstafi@gmail.com>wrote:
> On Thu, Dec 19, 2013 at 11:27 PM, Milan Stanojević <milanst@gmail.com>wrote:
>
>> What version of ocaml are you using? It works for me on 4.00.1
>>
>> OCaml 4.01.0 from OPAM.
>
> On Thu, Dec 19, 2013 at 5:21 PM, Lukasz Stafiniak <lukstafi@gmail.com>
>> wrote:
>> > On Thu, Dec 19, 2013 at 11:20 PM, Lukasz Stafiniak <lukstafi@gmail.com>
>> > wrote:
>> >>
>> >> Sorry! I've spotted it reading the email. (I should read before
>> sending.)
>> >>
>> > No, that's not it. My question is still open.
>>
>
>
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next prev parent reply other threads:[~2013-12-19 23:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-19 22:17 Lukasz Stafiniak
2013-12-19 22:20 ` Lukasz Stafiniak
2013-12-19 22:21 ` Lukasz Stafiniak
2013-12-19 22:27 ` Milan Stanojević
2013-12-19 22:35 ` Lukasz Stafiniak
2013-12-19 23:10 ` Gabriel Scherer [this message]
2013-12-19 23:47 ` Jacques Le Normand
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