<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">I do use the data Ex = forall a. ... syntax occasionally, but only when I'm emphasizing that I'm not building a GADT. I would entertain the thought of removing it. Yet, I don't think we can do so as part of this process, as we don't have a combination of extensions that allows GADT-syntax existentials but not this other syntax. (Even -XGADTs -XNoExistentialQuantification doesn't eliminate it.)<div class=""><br class=""></div><div class="">In any case, I've voted against GADTs, and so if you want to disentangle this one piece of syntax, that would also be a vote against GADTs, followed up with a proposal to spin out this syntax into its own extension.</div><div class=""><br class=""></div><div class="">Richard<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Dec 4, 2020, at 9:14 AM, Spiwack, Arnaud <<a href="mailto:arnaud.spiwack@tweag.io" class="">arnaud.spiwack@tweag.io</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><br class=""></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Ah one clarification, GADTSyntax alone does not enable existential types. You need to enable either ExistentialQuantification or full GADTs.<br class=""></blockquote><div class=""><br class=""></div><div class="">It makes more than perfect sense, but I wasn't aware of this. A consequence of always enabling -XGADTs, I suppose :-) .<br class=""></div></div></div>
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