From: Gabriel Kerneis <kerneis@pps.univ-paris-diderot.fr>
To: Jeremy Yallop <yallop@gmail.com>
Cc: caml-list@yquem.inria.fr, markus.mottl@gmail.com
Subject: Re: [Caml-list] Signature substitution and type parameters
Date: Mon, 12 Aug 2013 13:25:13 +0100 [thread overview]
Message-ID: <20130812122513.GA4129@kerneis.info> (raw)
In-Reply-To: <CAAxsn=GzCM=9ZmvaQj+iZkmGy=ba6hJfQ+p4DuRpne96Bhv6og@mail.gmail.com>
On Mon, Aug 12, 2013 at 11:20:17AM +0100, Jeremy Yallop wrote:
> If you use 'include' instead of 'let' it generalizes nicely to the
> many-function case:
>
> module MonoM : Mono = struct
> type t = int PolyM.t
> include (PolyM : Mono with type t := t)
> end
Ha! I tried it written as "include PolyM with ...", which is
invalid syntax, and didn't get any further. Thanks Jeremy.
> Your other approach can be made to work, too. The key is to define a
> type alias with no parameters (type t = int PolyM.t), then use
> destructive substitution (:=).
By the way, there is an unanswered question from June by Markus Mottl
about the root causes of this limitation:
https://sympa.inria.fr/sympa/arc/caml-list/2013-06/msg00147.html
Maybe you can shed some light on it?
Best regards,
--
Gabriel
prev parent reply other threads:[~2013-08-12 12:25 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-12 7:45 Gabriel Kerneis
2013-08-12 9:57 ` Raphaël Proust
2013-08-12 10:20 ` Jeremy Yallop
2013-08-12 12:25 ` Gabriel Kerneis [this message]
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