From: Alain Frisch <alain@frisch.fr>
To: oleg@okmij.org, gabriel.scherer@gmail.com
Cc: garrigue@math.nagoya-u.ac.jp, caml-list@inria.fr
Subject: Re: [Caml-list] Request for feedback: A problem with injectivity
Date: Thu, 04 Jul 2013 09:35:14 +0200 [thread overview]
Message-ID: <51D525B2.9080907@frisch.fr> (raw)
In-Reply-To: <20130704060748.15628.qmail@www1.g3.pair.com>
On 07/04/2013 08:07 AM, oleg@okmij.org wrote:
> The gist is using the type variable name 'a' from the definition of
> GADT, and attaching the numeric suffix to disambiguate. (GHC does that all
> the time -- and I believe OCaml does something similar in many cases,
> only not for GADTs.) What helps in particular I believe is quoting the
> clause from the GADT declaration, so we can see where the name 'a'
> comes from. So, perhaps if the error message can be improved with
> giving more information about the error, the problem will be solved
> without additional syntax?
Naming types created by opening GADT existentials is useful not only for
error messages, but also to have a way to refer to that type in the
branch (for instance to instantiate locally a functor whose argument
refers to that type).
-- Alain
next prev parent reply other threads:[~2013-07-04 7:35 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-28 0:02 [Caml-list] Request for feedback: A problem with injectivity and GADTs 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
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 [this message]
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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