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From: yoann padioleau <padator@wanadoo.fr>
To: Markus Mottl <markus.mottl@gmail.com>
Cc: Caml-list List <caml-list@inria.fr>
Subject: Re: [Caml-list] typing problem with sexplib and mutually recursive polymorphic types
Date: Wed, 11 Mar 2009 07:11:18 +0100 (CET)	[thread overview]
Message-ID: <21952156.346634.1236751878001.JavaMail.www@wwinf1b03> (raw)
In-Reply-To: <f8560b80903102125h784906d3ged83273e5cf523b0@mail.gmail.com>

> 
> This has to do with recursive type definitions, not with generating
> closures with _loc. The following is similar and does not compile
> either:
> 
> let rec foo () = []
> and bar () = "asdf" :: foo ()
> and bla () = 42 :: foo ()
> 
> These definitions are clearly sound, but the type checker doesn't get
> it. Note, however, that the following works:
> 
> let foo () = []
> let rec bar () = "asdf" :: foo ()
> and bla () = 42 :: foo ()
> 
> You can apply the same trick in your specific example by simply moving
> the type definition of x1 out of the cycle with x2 and x3.

Yes on this example, but what if I can't move it out because
the types really need to be mutually recursive ?


> 
> Cheers,
> Markus
> 
> -- 
> Markus Mottl http://www.ocaml.info markus.mottl@gmail.com
> 
> 


  reply	other threads:[~2009-03-11  6:11 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-11  2:45 Yoann Padioleau
2009-03-11  4:25 ` [Caml-list] " Markus Mottl
2009-03-11  6:11   ` yoann padioleau [this message]
2009-03-11 14:20     ` Markus Mottl
2009-03-11 14:32       ` Yitzhak Mandelbaum
2009-03-11 14:44         ` Markus Mottl
2009-03-11 16:16           ` Damien Doligez
2009-03-11 16:43             ` Markus Mottl
2009-03-11 19:03               ` Till Varoquaux
2009-03-12  1:42               ` Jacques Garrigue
2009-03-11 23:08         ` Yoann Padioleau

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