From: rossberg@mpi-sws.org
To: "Dawid Toton" <d0@wp.pl>
Cc: "caml-list" <caml-list@yquem.inria.fr>
Subject: Re: [Caml-list] Re: References and polymorphism
Date: Wed, 11 Jan 2012 14:15:14 +0100 [thread overview]
Message-ID: <13b032314ec2f8f50916bcfa6eb7f72b.squirrel@mail.mpi-sws.org> (raw)
In-Reply-To: <4F0D87E8.90602@wp.pl>
Dawid Toton wrote:
> let f3 : forall ˆ€'a . unit -> 'a list ref =
> fun (type 'aa) ->
> let r = ref ([] : 'aa list) in
> fun () ->
> r
>
> (* f3: Fine, but it would require some work at compile time or smart
> transformations to keep types erased at run-time. Also, keeping the
> first actual argument (staying for 'aa) implicit would need extra rules
> to resolve ambiguities (decide when this argument is applied). *)
No, this would be unsound, because "fun (type t) -> ..." does not the
suspend computation -- there'd be only one ref. It's not System F.
/Andreas
next prev parent reply other threads:[~2012-01-11 13:15 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-10 15:29 [Caml-list] " Dario Teixeira
2012-01-10 15:45 ` Romain Bardou
2012-01-10 16:31 ` Arnaud Spiwack
2012-01-10 17:00 ` Dario Teixeira
2012-01-10 17:20 ` David Allsopp
2012-01-10 18:59 ` Gabriel Scherer
2012-01-11 10:48 ` [Caml-list] " Dawid Toton
2012-01-11 11:07 ` Gabriel Scherer
2012-01-11 13:00 ` Dawid Toton
2012-01-11 13:15 ` rossberg [this message]
2012-01-11 13:56 ` Dawid Toton
2012-01-11 15:42 ` rossberg
2012-01-12 9:55 ` Dawid Toton
2012-01-12 10:05 ` Andrej Bauer
2012-01-12 10:46 ` Romain Bardou
2012-01-11 11:43 ` rossberg
2012-01-11 13:34 ` Dawid Toton
2012-01-11 15:34 ` rossberg
2012-01-11 13:57 ` Dawid Toton
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