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<p class="MsoNormal">Dear Steering Committee <o:p></o:p></p>
<p class="MsoNormal">Two weeks ago I asked<o:p></o:p></p>
<ul style="margin-top:0cm" type="circle">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l6 level1 lfo9"><b>Are there any other alternatives you
<i>strongly</i> want on the ballot?<o:p></o:p></b></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I got these responses<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l4 level1 lfo10">Joachim, Simon, Alejandro, Arnaud: nothing to add<o:p></o:p></li><li class="MsoListParagraph" style="color:red;margin-left:0cm;mso-list:l4 level1 lfo10">
Vitaly, Eric, Tom, Richard, Vlad: no response<o:p></o:p></li></ul>
<p class="MsoNormal">I’d love to hear from the five of you, please. I want to get a decision on this, and I can’t do that if I don’t hear from you.<o:p></o:p></p>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin:0cm"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> ghc-steering-committee <ghc-steering-committee-bounces@haskell.org>
<b>On Behalf Of </b>Simon Peyton Jones via ghc-steering-committee<br>
<b>Sent:</b> 15 June 2021 13:52<br>
<b>To:</b> Joachim Breitner <mail@joachim-breitner.de>; ghc-steering-committee@haskell.org<br>
<b>Subject:</b> Re: [ghc-steering-committee] Proposal #302: `\of` (New Shepherd: Simon PJ)<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoPlainText">| I’d like to reassing shepherding of this one.<o:p></o:p></p>
<p class="MsoPlainText">| <o:p></o:p></p>
<p class="MsoPlainText">| It seems to be clear that we want “something like this”, there are many ways<o:p></o:p></p>
<p class="MsoPlainText">| to skin the cat, so it comes down to opinion and what we need is a decision<o:p></o:p></p>
<p class="MsoPlainText">| (or a call to votes). As with anything that’s possibly quite opinionated,<o:p></o:p></p>
<p class="MsoPlainText">| it’s good to have an authorative voice, so in this case, Simon PJ.<o:p></o:p></p>
<p class="MsoPlainText">| <o:p></o:p></p>
<p class="MsoPlainText">| Simon, can you either come up with a “all things considered, I think this<o:p></o:p></p>
<p class="MsoPlainText">| variant is the (narrowly) the best” recommendation or, alternative, a<o:p></o:p></p>
<p class="MsoPlainText">| “please vote on the following options” verdict?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span style="font-family:"Calibri",sans-serif">OK, to remind everyone<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoPlainText" style="mso-list:l5 level1 lfo3"><span style="font-family:"Calibri",sans-serif">Here is the proposal:
<a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FJakobBruenker%2Fghc-proposals%2Fblob%2Fpatch-1%2Fproposals%2F0000-lambda-layout.md&data=04%7C01%7Csimonpj%40microsoft.com%7C0903e8fd7cbe4aadc88b08d92ffc71d2%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637593584027236069%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=DNZOpilyGrWdTDQyaqEgf1orDNQNX9ZwbMwmGYAk64g%3D&reserved=0">
https://github.com/JakobBruenker/ghc-proposals/blob/patch-1/proposals/0000-lambda-layout.md</a><o:p></o:p></span></li><li class="MsoPlainText" style="mso-list:l5 level1 lfo3"><span style="font-family:"Calibri",sans-serif">Here is the discussion:
<a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F302&data=04%7C01%7Csimonpj%40microsoft.com%7C0903e8fd7cbe4aadc88b08d92ffc71d2%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637593584027246062%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=LXuEVBuMxQlbF0elOS2792K5avMW3SeIYEuEDyyFmmo%3D&reserved=0">
https://github.com/ghc-proposals/ghc-proposals/pull/302</a><o:p></o:p></span></li></ul>
<p class="MsoPlainText"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Calibri",sans-serif">The basic idea is to extend to lambda all the facilities that you get with function definitions, especially multiple patterns and guards. This seems clearly a good idea, whose only obstacle
is syntactic. There are no conceptual or specification challenges. The only point at issue is that of concrete syntax.<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Calibri",sans-serif">The proposal offers four possible syntactic options. After reviewing, I propose to discard (2) and (3) leaving these alternatives<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo6"><b>Option (1)
</b>\cases { p1 p2 -> rhs1; q1 q2 -> rhs2 }<o:p></o:p></li></ul>
<ul style="margin-top:0cm" type="disc">
<ul style="margin-top:0cm" type="circle">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level2 lfo6">Lives alongside \case, but allows multiple patterns<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level2 lfo6">Other keywords are possible, but I think it must be a variant on \case<o:p></o:p></li></ul>
</ul>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo6"><b>Option (4)</b> Same, but use \case as the keyword<o:p></o:p></li></ul>
<ul style="margin-top:0cm" type="disc">
<ul style="margin-top:0cm" type="circle">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level2 lfo6">Incompatible with existing \case => extended transition period, unhappy users<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level2 lfo6">\case { (Just x) -> rhs1; Nothing -> rhs2 } will require parens forever, which in the common case of a one argument lambda see clunky.<o:p></o:p></li></ul>
</ul>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo6"><b>Option (X).</b> Reject the proposal.<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Personally I favour (1). I’m relaxed about having multiple ways of saying the thing (think of let vs where), and I see no harm provided the two constructs look and behave the same. I’ve decided I like \cases precisely because it’s the
plural of \case, which is exactly what is going on.<o:p></o:p></p>
<p class="MsoNormal">I think we’ll end up having to vote on this, which is fine when it’s a judgement call about syntax. But first:<o:p></o:p></p>
<ul style="margin-top:0cm" type="circle">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l6 level1 lfo9"><b>Are there any other alternatives you
<i>strongly</i> want on the ballot?<o:p></o:p></b></li></ul>
<p class="MsoNormal">I say “strongly” because I don’t want to open up a big new debate… we at the stage of trying to narrow options.<o:p></o:p></p>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
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