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From: =?UTF-8?Q?Milan_Stanojevi=C4=87?= <milanst@gmail.com>
Date: Thu, 19 Mar 2015 12:46:59 -0400
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Cc: Jeremy Yallop <yallop@gmail.com>, Jeremie Dimino <jdimino@janestreet.com>, 
	Caml-list <caml-list@inria.fr>
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Subject: Re: [Caml-list] GADT existential escape

> N.B. As it stands this is slightly less efficient than using open variants, since you'd have to allocate an exn value for checking equality.
>

Exceptions and open variants are actually exactly the same.
"exception" is basically a syntactic sugar now.
exception Foo of int is the same as type exn += Foo of int.