From: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
To: jhw@conjury.org
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] spurious warning? "polymorphic method not principal"
Date: Fri, 17 Mar 2006 18:55:07 +0900 (JST) [thread overview]
Message-ID: <20060317.185507.03978259.garrigue@math.nagoya-u.ac.jp> (raw)
In-Reply-To: <B0DFEE75-13D5-4D9E-BCDB-96EA99E1FFAD@conjury.org>
From: j h woodyatt <jhw@conjury.org>
> > (* test.ml *)
> > class alfa = object(_:'self)
> > method x: 'a. ('a, out_channel, unit) format -> 'a = Printf.printf
> > end
> >
> > class bravo a = object
> > val y: alfa = (a :> alfa)
> > initializer y#x "bravo initialized"
> > end
> >
> > class charlie a = object
> > inherit bravo a
> > initializer y#x "charlie initialized"
> > end
>
> $ ocamlc -principal -o test test.ml
> File "test.ml", line 13, characters 14-17:
> Warning X: this use of a polymorphic method is not principal.
>
> It warns about the use of the polymorphic method on the object in the
> membership of the base class, but only when it's invoked from the
> derived class. This confuses me. Is this a bug in my code?
No, this is a bug in the compiler. I'll try to fix it.
Jacques Garrigue
prev parent reply other threads:[~2006-03-17 9:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-16 22:23 j h woodyatt
2006-03-17 9:55 ` Jacques Garrigue [this message]
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