From: brogoff <brogoff@speakeasy.net>
To: Luc Maranget <luc.maranget@inria.fr>
Cc: Jeremy Yallop <j.d.yallop@sms.ed.ac.uk>, caml-list@inria.fr
Subject: Re: [Caml-list] Oddness with recursive polymorphic variants
Date: Thu, 4 May 2006 11:33:37 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.58.0605041128440.9940@shell3.speakeasy.net> (raw)
In-Reply-To: <20060504171010.GB23421@yquem.inria.fr>
On Thu, 4 May 2006, Luc Maranget wrote:
> I cannot really explain why it matters, but I can supply a minimal (?) example
>
> type f = [`A ]
> type g = [f | `C]
>
> let k (x:f) = (x:g);;
> ^
> This expression has type f but is here used with type g
> The first variant type does not allow tag(s) `C
Not enough polymorphism, the error message seems clear
type 'a h = 'a constraint 'a = [> `A];;
let k (x : 'a h) = (x : g)
works.
-- Brian
next prev parent reply other threads:[~2006-05-04 18:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-04 15:54 Jeremy Yallop
2006-05-04 17:10 ` [Caml-list] " Luc Maranget
2006-05-04 18:26 ` Michael Wohlwend
2006-05-04 18:33 ` brogoff [this message]
2006-05-04 18:58 ` Jeremy Yallop
2006-05-05 0:01 ` brogoff
2006-05-05 6:43 ` Luc Maranget
-- strict thread matches above, loose matches on Subject: below --
2006-05-04 15:50 Jeremy Yallop
2006-05-04 19:03 ` [Caml-list] " Nils Gesbert
2006-05-04 20:30 ` Nils Gesbert
2006-05-05 8:04 ` Jeremy Yallop
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