<div dir="ltr">Hello,<div><br></div><div>I don't think we should accept this proposal, for the following reasons:</div><div> * it is premature to "reserve" syntax for a future extension<br></div><div> * I am not convinced that a design with 12 quantifiers is what I'd want to use</div><div> * I am not convinced about the utility of the "dependent haskell" extension in the first place.</div><div><br></div><div>-Iavor</div><div><br></div><div><br></div><div><br></div><div><div class="gmail_quote"><div dir="ltr">On Fri, Feb 23, 2018 at 7:39 AM Joachim Breitner <<a href="mailto:mail@joachim-breitner.de">mail@joachim-breitner.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Committee,<br>
<br>
this is your secretary speaking:<br>
<br>
Dependent Haskell quantifiers were proposed, by Richard.<br>
<a href="https://github.com/ghc-proposals/ghc-proposals/pull/102" rel="noreferrer" target="_blank">https://github.com/ghc-proposals/ghc-proposals/pull/102</a><br>
rendered at<br>
<a href="https://github.com/goldfirere/ghc-proposals/blob/pi/proposals/0000-pi.rst" rel="noreferrer" target="_blank">https://github.com/goldfirere/ghc-proposals/blob/pi/proposals/0000-pi.rst</a><br>
<br>
I’ll shepherd that myself.<br>
<br>
This proposal defines and reserves the syntax for the quantifiers that<br>
eventually Dependent Haskell will need, and allows their use where it<br>
makes sense already (e.g. in Kinds). The quantifier are:<br>
<br>
forall a.<br>
forall a '.<br>
forall a -><br>
forall a '-><br>
foreach a.<br>
foreach a '.<br>
foreach a -><br>
foreach a '-><br>
ty =><br>
ty '=><br>
ty -><br>
ty '-><br>
<br>
<br>
It addresses the interaction with warning (e.g. -Wcompat). It looks<br>
well-thought-through, one might infer that the authors wrote a thesis<br>
about this stuff.<br>
<br>
There is some syntactic bikeshedding possible; for example the proposal<br>
proposes "foreach" instead of "pi" (the latter would make "pi" a<br>
keyword, which would be unfortunate for those who deal with circles).<br>
<br>
If someone has better ideas, in particular about the use of ' to denote<br>
matchable arrows, we still have time to suggest them.<br>
<br>
I recommend to accept this proposal in the current form or with further<br>
refinements to the syntax, if we can come up with them.<br>
<br>
<br>
Thanks,<br>
Joachim<br>
--<br>
Joachim Breitner<br>
<a href="mailto:mail@joachim-breitner.de" target="_blank">mail@joachim-breitner.de</a><br>
<a href="http://www.joachim-breitner.de/" rel="noreferrer" target="_blank">http://www.joachim-breitner.de/</a><br>
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</blockquote></div></div></div>