From: "Nicolas Pouillard" <nicolas.pouillard@gmail.com>
To: "Pietro Abate" <Pietro.Abate@anu.edu.au>,
"ocaml ml" <caml-list@inria.fr>
Subject: Re: [Caml-list] polymorphic variants and camlp4
Date: Mon, 12 Feb 2007 11:54:15 +0100 [thread overview]
Message-ID: <cd67f63a0702120254y4724572fya56b21874f677a97@mail.gmail.com> (raw)
In-Reply-To: <20070212033220.GA30365@pulp.rsise.anu.edu.au>
On 2/12/07, Pietro Abate <Pietro.Abate@anu.edu.au> wrote:
> Hi all,
>
> What is the syntax to use polymorphic variants with camlp4 ?
It depends what you mean by "with camlp4", but I suppose you mean
"what is the revised syntax for polymorphic variants ?".
> <:str_item< type a = A >> is ok, but <:str_item< type a = [ `A ] >>
<:str_item< type a = A >> is not really ok neither
try <:str_item< type a = A | B >> to see that's not ok, the grammar
just accept it as an alias.
The syntax for classic variants is <:str_item< type a = [ A | B of int
and int | C of (int * int) ] >>
For polymorphic ones it's <:str_item< type a = [ = A | B ] >>
> doesn't work as expected...
Yes but you expected the original syntax for types declaration.
--
Nicolas Pouillard
prev parent reply other threads:[~2007-02-12 10:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-12 3:32 Pietro Abate
2007-02-12 4:01 ` [Caml-list] " Martin Jambon
2007-02-12 4:12 ` Pietro Abate
2007-02-12 14:29 ` Serge Aleynikov
2007-02-12 10:54 ` Nicolas Pouillard [this message]
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