From: skaller <skaller@users.sourceforge.net>
To: Michael Vanier <mvanier@cs.caltech.edu>
Cc: oleg_trott@columbia.edu, caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] extensible records again
Date: 22 Mar 2004 14:31:16 +1100 [thread overview]
Message-ID: <1079926276.3165.49.camel@pelican.wigram> (raw)
In-Reply-To: <20040321223401.392519BBA2@orchestra.cs.caltech.edu>
On Mon, 2004-03-22 at 09:34, Michael Vanier wrote:
> If I understand you correctly, then you're arguing that *all* my "core
> types" should be implemented using polymorphic variants.
I use Polymorphic Variants almost exclusively in Felix.
They're more flexible but also give nastier error messages.
The main downside is that to make covariant subtyping
you need to use fixpoints, which is fine for a single
parameter but unworkable for a more complex term
structure.
It would be interesting if Camlp4 could solve this problem
somehow.
--
John Skaller, mailto:skaller@users.sf.net
voice: 061-2-9660-0850,
snail: PO BOX 401 Glebe NSW 2037 Australia
Checkout the Felix programming language http://felix.sf.net
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next prev parent reply other threads:[~2004-03-22 3:26 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-21 6:21 Michael Vanier
2004-03-21 8:08 ` Oleg Trott
2004-03-21 8:40 ` Michael Vanier
2004-03-21 16:10 ` Oleg Trott
2004-03-21 17:06 ` skaller
2004-03-21 17:36 ` Oleg Trott
2004-03-22 3:19 ` skaller
2004-03-22 7:49 ` Ville-Pertti Keinonen
2004-03-22 9:32 ` Oleg Trott
2004-03-22 10:25 ` Ville-Pertti Keinonen
2004-03-21 22:35 ` Michael Vanier
2004-03-22 3:39 ` skaller
2004-03-21 22:34 ` Michael Vanier
2004-03-22 3:31 ` skaller [this message]
2004-03-22 5:54 ` Michael Vanier
2004-03-23 19:14 ` skaller
2004-03-24 1:41 ` Jacques Garrigue
2004-03-24 8:44 ` Julien Signoles
2004-03-24 10:04 ` Jacques Garrigue
2004-03-21 8:53 ` Martin Jambon
2004-03-21 9:22 ` Michael Vanier
2004-03-21 17:00 ` skaller
2004-03-22 8:13 ` Achim Blumensath
2004-03-23 2:14 ` Michael Vanier
2004-03-23 7:25 ` Achim Blumensath
2004-03-31 10:05 ` Marcin 'Qrczak' Kowalczyk
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