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From: David Teller <David.Teller@ens-lyon.org>
To: Florian Hars <hars@bik-gmbh.de>
Cc: Luca de Alfaro <luca@dealfaro.org>,
	Inria Ocaml Mailing List <caml-list@inria.fr>
Subject: Re: [Caml-list] Why can't I call a function over a subclass?
Date: Fri, 05 Oct 2007 12:30:33 +0200	[thread overview]
Message-ID: <1191580233.6509.26.camel@Blefuscu> (raw)
In-Reply-To: <4705EF58.3040605@bik-gmbh.de>

I agree with Luca that it's disconcerting. 
When r is a class, I would expect 
 let f (x:r) (y:r) =...
to have a type such as
 x :> r -> y :> r -> ...

Cheers,
 David

On Fri, 2007-10-05 at 10:01 +0200, Florian Hars wrote:
> Luca de Alfaro schrieb:
> > The absurdity continues:
> 
> This is not absurd, this is the documented correct behaviuor.
> If *you* decide that f must only accept arguments of *exactly*
> type r, the typechecker enforces your decision, as it does if
> you decide that f may also accept subtypes of r (as long as your
> decisions are consistent within he type system).
> 
> Yours, Florian.
> 
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  parent reply	other threads:[~2007-10-05 10:30 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-10-05  7:48 Luca de Alfaro
2007-10-05  8:01 ` [Caml-list] " Florian Hars
2007-10-05  8:08   ` Luca de Alfaro
2007-10-05  8:08     ` Fwd: " Luca de Alfaro
2007-10-05 11:08     ` Vincent Aravantinos
2007-10-05 11:47       ` Christophe Raffalli
2007-10-05 10:30   ` David Teller [this message]
2007-10-05 10:53     ` Zheng Li
2007-10-05 14:02       ` [Caml-list] " David Teller
2007-10-05 14:59         ` Luca de Alfaro
2007-10-05 15:12           ` Luca de Alfaro
     [not found]             ` <20071005152130.M41697@cs.unm.edu>
2007-10-05 15:49               ` Luca de Alfaro
2007-10-05 16:34                 ` Edgar Friendly
2007-10-05 17:39                   ` Luca de Alfaro
2007-10-05 17:49                     ` Martin Jambon
     [not found]                       ` <28fa90930710052153k2128bb63m5132455868eb2008@mail.gmail.com>
2007-10-07 22:19                         ` Martin Jambon
2007-10-07 22:57                         ` Classes and polymorphism (Re: [Caml-list] Re: Why can't I call a function over a subclass?) Martin Jambon
2007-10-05 19:48                 ` Why can't I call a function over a subclass? Zheng Li
2007-10-06  1:49                   ` [Caml-list] " Jake Donham
2007-10-09  4:18                 ` Jacques Garrigue
2007-10-05  8:07 ` [Caml-list] " Pietro Abate
2007-10-05 10:55 ` Andrej Bauer

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