From: skaller <skaller@users.sourceforge.net>
To: "Flávio Leonardo Cavalcanti de Moura" <flavio@macs.hw.ac.uk>
Cc: caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] type matching
Date: 18 Sep 2004 02:08:10 +1000 [thread overview]
Message-ID: <1095437290.2580.61.camel@pelican.wigram> (raw)
In-Reply-To: <1095432814.6857.19.camel@lcflavio.macs.hw.ac.uk>
On Sat, 2004-09-18 at 00:53, Flávio Leonardo Cavalcanti de Moura wrote:
> Hi there,
>
> I am trying to build a normalisation function for lambda terms which
> This expression has type exlambda * int * 'a list * string
> but is here used with type Setypes.exlambda * int * int list * string
>
> My dout is: shouldn't the type exlambda match with the type
> Setypes.exlambda as well as 'a list with int list in the two last line
> above?
>
> Why Ocaml differ between the types Setypes.exlambda and exlambda?
module type X = sig type t end
module Y = struct type t = int end
--> module Y : sig type t = int end
module Z : X = Y
--> module Z : X
let i : Y.t = 1
--> val x : Y.t = 1
let ni : Z.t = 1
--> This expression has type int but is here used with type Z.t
Y.t is just an alias for 'int'
However Z.t is an abstract type because X.t is.
--
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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prev parent reply other threads:[~2004-09-17 16:08 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-17 14:53 Flávio Leonardo Cavalcanti de Moura
2004-09-17 16:08 ` skaller [this message]
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