From: Andre Nathan <andre@digirati.com.br>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Segfault with open GADTs
Date: Tue, 18 Oct 2016 12:50:45 -0200 [thread overview]
Message-ID: <0ee74760-8b24-66bd-2b5c-900df67e220a@digirati.com.br> (raw)
In-Reply-To: <20161018142102.GA21704@frosties>
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On 10/18/2016 12:21 PM, Goswin von Brederlow wrote:
> You can pass along the outermost to_string to all to_string
> functions so they can restart from the outside when they recurse.
Yep :) For the record, I got it working like this:
In M0:
let assert_false _ = assert false
type f = { f : 'a. 'a t -> string }
let rec to_string
: type a b. ?f:f -> a t -> string
= fun ?(f = { f = assert_false }) e -> match e with
| I i -> "I:" ^ string_of_int i
| S s -> "S:" ^ s
| P (x, y) -> to_string ~f x ^ to_string ~f y
| e -> f.f e
In M1:
let rec to_string' : type a. a t -> string = function
| T t -> to_string ~f:{ f = to_string' } t
| x -> to_string ~f:{ f = to_string' } x
let to_string = to_string'
Cheers,
Andre
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next prev parent reply other threads:[~2016-10-18 14:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-18 12:47 Andre Nathan
2016-10-18 13:10 ` Pierrick Couderc
2016-10-18 13:52 ` Andre Nathan
2016-10-18 14:21 ` Goswin von Brederlow
2016-10-18 14:50 ` Andre Nathan [this message]
2016-10-18 13:16 ` Jeremy Yallop
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