From: Alain Frisch <alain@frisch.fr>
To: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
Cc: OCaML List Mailing <caml-list@inria.fr>
Subject: Re: [Caml-list] Request for feedback: A problem with injectivity and GADTs
Date: Tue, 30 Apr 2013 10:02:47 +0200 [thread overview]
Message-ID: <517F7AA7.1020108@frisch.fr> (raw)
In-Reply-To: <ABAAA0EE-A2AE-4AAA-B475-80D4AA9C10D2@math.nagoya-u.ac.jp>
On 04/30/2013 09:56 AM, Jacques Garrigue wrote:
> On 2013/04/30, at 15:59, Alain Frisch <alain@frisch.fr> wrote:
>
>> It's reassuring to see that the conservative solution (not assuming injectivity of user defined abstract types) does not seem too bad for now, even if not very satisfying.
>>
>> I'm only concerned with:
>>
>>> 3) The problem I describe in my first mail. I.e. when defining a type,
>>> if you use type variables appearing in constrained type parameters,
>>> you need the type constructors leading to the type variables to be
>>> injective. This is PR#5985, and it is only fixed in branches/non-vanishing.
>>
>> Do you think that fixing this unsoundness (without injectivity annotations) would lead to reject existing programs?
>
> Potentially yes.
> But I don't know how it is in practice for code existing now.
> Hence my question.
Apart from GADTs, does your patch address the unsoundness with type
constraints?
Alain
next prev parent reply other threads:[~2013-04-30 8:02 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-28 0:02 Jacques Garrigue
2013-04-28 2:45 ` Markus Mottl
2013-04-28 10:28 ` Jacques Garrigue
2013-04-28 5:54 ` Jacques Le Normand
2013-04-29 3:45 ` Ivan Gotovchits
2013-04-29 4:03 ` Ivan Gotovchits
2013-04-29 5:17 ` Jacques Le Normand
2013-04-29 7:58 ` Alain Frisch
2013-04-29 10:52 ` Jacques Garrigue
2013-04-29 11:23 ` Alain Frisch
2013-04-29 16:37 ` Nathan Mishra Linger
2013-04-29 23:53 ` Jacques Garrigue
2013-04-30 5:45 ` Jacques Garrigue
2013-05-04 6:46 ` Jacques Garrigue
2013-05-04 7:09 ` Gabriel Scherer
2013-05-04 12:28 ` Jacques Garrigue
2013-04-30 6:59 ` Alain Frisch
2013-04-30 7:56 ` Jacques Garrigue
2013-04-30 8:02 ` Alain Frisch [this message]
2013-04-30 8:18 ` Jacques Garrigue
2013-04-30 9:11 ` Gabriel Scherer
2013-04-30 9:55 ` Jacques Garrigue
2013-04-30 10:12 ` Leo White
2013-04-30 11:30 ` Gabriel Scherer
2013-04-30 13:06 ` Leo White
2013-04-29 7:59 ` Gabriel Scherer
2013-07-01 14:47 ` Alain Frisch
2013-07-01 23:20 ` Jacques Garrigue
2013-07-03 16:08 ` Alain Frisch
2013-07-03 16:13 ` Gabriel Scherer
2013-07-04 6:07 ` [Caml-list] Request for feedback: A problem with injectivity oleg
2013-07-04 7:35 ` Alain Frisch
2013-07-05 10:30 ` oleg
2013-07-05 12:02 ` Alain Frisch
2013-07-04 1:00 ` [Caml-list] Request for feedback: A problem with injectivity and GADTs Jacques Garrigue
2013-07-04 8:14 ` Alain Frisch
2013-07-04 8:52 ` Jacques Garrigue
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