From: "Chris King" <colanderman@gmail.com>
To: "Jacques Garrigue" <garrigue@math.nagoya-u.ac.jp>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Unexpected '_a problem
Date: Fri, 4 Aug 2006 10:18:41 -0400 [thread overview]
Message-ID: <875c7e070608040718p471beb84md8c46d4f7622a8f3@mail.gmail.com> (raw)
In-Reply-To: <20060804.114239.193683263.garrigue@math.nagoya-u.ac.jp>
On 8/3/06, Jacques Garrigue <garrigue@math.nagoya-u.ac.jp> wrote:
> type 'a bar_t = Bar of <bar: ('a -> unit) -> unit> ;;
> let create_bar () = Bar (object method bar (_: 'a) = () end);;
> let b = create_bar ();;
> let Bar b = b;;
Okay, that got the types to work out correctly.
> If you still want to use Obj.magic, remember to put complete type
> annotions on both its input and output, as the lack of type
> information may break the compiler.
Surprisingly putting a type annotation on its output caused it to
infer a monomorphic type - I was relying on the type in the module's
signature since the type there is abstract.
next prev parent reply other threads:[~2006-08-04 14:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-01 20:47 Chris King
2006-08-01 21:20 ` [Caml-list] " Andreas Rossberg
2006-08-01 22:09 ` Remi Vanicat
2006-08-02 7:00 ` Alain Frisch
2006-08-02 17:57 ` Chris King
2006-08-04 2:42 ` Jacques Garrigue
2006-08-04 14:18 ` Chris King [this message]
2006-08-02 7:03 ` Christophe Dehlinger
2006-08-02 8:07 ` Andreas Rossberg
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