* [Caml-list] mixing GADTs and first class modules
@ 2015-03-18 10:19 Maxence Guesdon
2015-03-18 10:24 ` Jeremy Yallop
0 siblings, 1 reply; 3+ messages in thread
From: Maxence Guesdon @ 2015-03-18 10:19 UTC (permalink / raw)
To: caml-list
Hello,
I thought that something like this was possible:
module type M = sig type t end;;
type _ foo = T : (module M) -> M.t foo;;
but it does not seem so, as I can't refer to type t of the module
parameter:
Error: Unbound type constructor M.t
Is there a workaround ?
Regards,
Maxence
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Caml-list] mixing GADTs and first class modules
2015-03-18 10:19 [Caml-list] mixing GADTs and first class modules Maxence Guesdon
@ 2015-03-18 10:24 ` Jeremy Yallop
2015-03-18 10:28 ` Maxence Guesdon
0 siblings, 1 reply; 3+ messages in thread
From: Jeremy Yallop @ 2015-03-18 10:24 UTC (permalink / raw)
To: Maxence Guesdon; +Cc: Caml List
On 18 March 2015 at 10:19, Maxence Guesdon <Maxence.Guesdon@inria.fr> wrote:
> module type M = sig type t end;;
> type _ foo = T : (module M) -> M.t foo;;
>
> but it does not seem so, as I can't refer to type t of the module
> parameter:
> Error: Unbound type constructor M.t
>
> Is there a workaround ?
Yes:
type _ foo = T : (module M with type t = 'a) -> 'a foo
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Caml-list] mixing GADTs and first class modules
2015-03-18 10:24 ` Jeremy Yallop
@ 2015-03-18 10:28 ` Maxence Guesdon
0 siblings, 0 replies; 3+ messages in thread
From: Maxence Guesdon @ 2015-03-18 10:28 UTC (permalink / raw)
To: Jeremy Yallop; +Cc: Caml List
On Wed, 18 Mar 2015 10:24:34 +0000
Jeremy Yallop <yallop@gmail.com> wrote:
> On 18 March 2015 at 10:19, Maxence Guesdon <Maxence.Guesdon@inria.fr> wrote:
> > module type M = sig type t end;;
> > type _ foo = T : (module M) -> M.t foo;;
> >
> > but it does not seem so, as I can't refer to type t of the module
> > parameter:
> > Error: Unbound type constructor M.t
> >
> > Is there a workaround ?
>
> Yes:
>
> type _ foo = T : (module M with type t = 'a) -> 'a foo
Nice, thanks !
- m
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2015-03-18 10:28 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-03-18 10:19 [Caml-list] mixing GADTs and first class modules Maxence Guesdon
2015-03-18 10:24 ` Jeremy Yallop
2015-03-18 10:28 ` Maxence Guesdon
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).