From: "Jonathan Roewen" <jonathan.roewen@gmail.com>
To: "Seth J. Fogarty" <sfogarty@gmail.com>
Cc: caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] Question on Variant Types
Date: Thu, 29 Jun 2006 11:51:00 +1200 [thread overview]
Message-ID: <ad8cfe7e0606281651o3b9f82dfhe0067bcd581ab938@mail.gmail.com> (raw)
In-Reply-To: <c7ee61120606281644y1ed7b5cev174c4fe3f664cb63@mail.gmail.com>
> Followup question:
> Given I have:
> type foo = [`A | `B of int | `C of char]
> type bar = [`B of int | `C of char| `D]
>
> and a function
> let f (x : foo) : bar =
> match x with
> `A -> `D
> |`B _
> |`C _ -> (x : bar)
>
> Is there any way to properly coerce this using the restricted variant
> information of x? Or do I have to duplicate code and reconstruct x?
let f (x : foo) : bar = match x with
| `A -> `D
| `B _ | `C _ as x -> (x : bar)
Jonathan
next prev parent reply other threads:[~2006-06-28 23:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-28 16:27 Seth J. Fogarty
2006-06-28 16:47 ` [Caml-list] " Jonathan Roewen
2006-06-28 16:48 ` Jonathan Roewen
2006-06-28 23:44 ` Seth J. Fogarty
2006-06-28 23:51 ` Jonathan Roewen [this message]
[not found] ` <c7ee61120606281739g27fc344bt855cde4bd6a89797@mail.gmail.com>
2006-06-29 3:09 ` Jonathan Roewen
2006-06-29 3:37 ` Jacques Garrigue
2006-06-29 21:27 ` Another question on variant types and matching (was: Re: [Caml-list] Question on Variant Types) Richard Jones
2006-06-29 21:51 ` Jonathan Roewen
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