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From: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
To: jeremy.yallop@ed.ac.uk
Cc: darioteixeira@yahoo.com, caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Troublesome nodes
Date: Thu, 17 Jul 2008 09:43:28 +0900 (JST)	[thread overview]
Message-ID: <20080717.094328.191385811.garrigue@math.nagoya-u.ac.jp> (raw)
In-Reply-To: <487BAB0B.6030000@ed.ac.uk>

From: Jeremy Yallop <jeremy.yallop@ed.ac.uk>
> Dario Teixeira wrote:
> >     type ('a, 'b) t = private 'a constraint 'a = [< super_node_t ]
> 
> I don't think this is quite what you want yet, although it's getting
> close!
> 
> The first problem is that phantom types must be implemented in terms
> of abstract (or at least generative) types.

This is actually the other way round: abstract and private types allow
phantom types, but abbreviations and normal datatypes (generative
ones) don't.
So the above code really defines a phantom type.

Jacques Garrigue


  parent reply	other threads:[~2008-07-17  0:43 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-11 20:39 Dario Teixeira
2008-07-11 21:20 ` [Caml-list] " Jeremy Yallop
2008-07-12 12:37   ` Dario Teixeira
2008-07-12 13:25     ` Jacques Carette
2008-07-12 16:44     ` Wolfgang Lux
2008-07-12 18:21       ` Dario Teixeira
2008-07-12 18:27         ` Jeremy Yallop
2008-07-12 18:58       ` Jacques Carette
2008-07-11 23:11 ` Zheng Li
2008-07-13 14:32 ` [Caml-list] " Dario Teixeira
2008-07-13 17:39   ` Dario Teixeira
2008-07-13 21:10     ` Jon Harrop
2008-07-14 15:11       ` Dario Teixeira
2008-07-14 18:52         ` Dario Teixeira
2008-07-14 19:37           ` Jeremy Yallop
2008-07-16 21:22             ` Dario Teixeira
2008-07-17  0:43             ` Jacques Garrigue [this message]
2008-07-17 10:59               ` Jeremy Yallop
2008-07-18  2:34                 ` Jacques Garrigue
2008-07-18  9:47                   ` Jeremy Yallop
2008-07-18 13:02                     ` Jacques Garrigue
2008-07-18 13:55                       ` Jacques Garrigue
2008-07-19  2:15                         ` Jacques Garrigue
2008-07-17 16:12               ` Dario Teixeira
2008-07-18  2:27                 ` Jacques Garrigue
2008-07-18 13:09                   ` Dario Teixeira
2008-07-18 17:36                     ` Dario Teixeira
2008-07-19  2:23                       ` Jacques Garrigue
2008-07-19  8:43                         ` Dario Teixeira

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