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 11:52:40 -0200 [thread overview]
Message-ID: <ea2ae4ee-d242-0235-cce5-d90b7a59295b@digirati.com.br> (raw)
In-Reply-To: <CA+gYG2tR3t_=Q9Gzm8SRtdPbpJy9YTtcZENEGE6Nqd87mFNcWw@mail.gmail.com>
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On 10/18/2016 11:10 AM, Pierrick Couderc wrote:
> Hi,
>
> It is supposed to work, but it seems thepattern-matching compiler does
> not detect that M0.to_string is non exhaustive, thus it does not add a
> Match_Failure in case the variant is unknown. With extensible variants,
> a pattern matching is only exhaustive if you provide a wildcard or a
> variable for variants added afterwards.
Indeed, if I add a catch-all branch in M0.to_string then the code in
that branch is run, with no segfault.
But I guess my original idea of extending the type doesn't really work
as I hoped, since with nested expressions like that, I'd need to find a
way for M0.to_string to call back M1.to_string when a `T` is found.
Back to the drawing board...
Thanks,
Andre
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next prev parent reply other threads:[~2016-10-18 13:52 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 [this message]
2016-10-18 14:21 ` Goswin von Brederlow
2016-10-18 14:50 ` Andre Nathan
2016-10-18 13:16 ` Jeremy Yallop
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