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From: "Loup Vaillant" <loup.vaillant@gmail.com>
To: "Damien Doligez" <damien.doligez@inria.fr>
Cc: "Caml List" <caml-list@inria.fr>
Subject: Re: [Caml-list] Unexpected restriction in "let rec" expressions
Date: Tue, 26 Feb 2008 15:34:37 +0100	[thread overview]
Message-ID: <6f9f8f4a0802260634j133a6b5fl1868c6886f308c1b@mail.gmail.com> (raw)
In-Reply-To: <958FA43C-037A-47D3-9352-682443875A69@inria.fr>

2008/2/26, Damien Doligez <damien.doligez@inria.fr>:
> The restriction is documented in section 7.3 of the reference manual,
>  and it's here to make recursive definitions work correctly under
>  eager evaluation.

OK, I got it. By the way, replacing "couple" by "couple ()" does the trick:

# let loop f a =
    let rec couple () = f (a, snd (couple ())) in
      fst (couple ());;
    val loop : ('a * 'b -> 'c * 'b) -> 'a -> 'c = <fun>

Now, I have yet to figure out the purpose of this so called "fixpoint
operator" (and if the above will work at all :-).

Thank you all,
Loup


  reply	other threads:[~2008-02-26 14:34 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-26 12:24 Loup Vaillant
2008-02-26 14:04 ` [Caml-list] " Jean-Christophe Filliâtre
2008-02-26 14:18 ` Damien Doligez
2008-02-26 14:34   ` Loup Vaillant [this message]
2008-02-26 14:51     ` Gabriel Kerneis
2008-02-26 14:56     ` blue storm
2008-02-26 17:48     ` Nicolas Pouillard
2008-02-26 14:57 ` Dirk Thierbach
2008-02-27  8:53 ` Andrej Bauer
2008-02-27  9:43   ` Loup Vaillant
2008-02-27 12:02     ` Dirk Thierbach
2008-02-27 14:04       ` Loup Vaillant
2008-02-27 16:41         ` Dirk Thierbach
2008-02-27 23:32           ` Loup Vaillant
2008-02-27 19:03 ` Pal-Kristian Engstad
2008-02-27 23:46   ` Loup Vaillant

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