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<p class="MsoNormal">I have since heard from Tom, Eric, and Arnaud; and Iavor has stepped down from the committee. So we have<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo3">Support: Tom, Eric, Arnaud, Joachim, Vitaly, Alejandro, Vlad (plus Richard and myself)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo3">Against: no one<o:p></o:p></li></ul>
<p class="MsoNormal">That leaves: Cale and Simon M.<o:p></o:p></p>
<p class="MsoNormal">At this point I think we have enough support to declare the proposal accepted.<o:p></o:p></p>
<p class="MsoNormal">Joachim, can you merge it?<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>
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<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"> Simon Peyton Jones <simonpj@microsoft.com>
<br>
<b>Sent:</b> 13 May 2021 16:09<br>
<b>To:</b> ghc-steering-committee@haskell.org<br>
<b>Cc:</b> Simon Peyton Jones <simonpj@microsoft.com><br>
<b>Subject:</b> RE: Recommendation for #378: support the design for dependent types<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Friends<o:p></o:p></p>
<p class="MsoNormal">You have now had a month to review my recommendation below, to accept #378: support for dependent types.
<a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fgoldfirere%2Fghc-proposals%2Fblob%2Fdependent-types%2Fproposals%2F0000-dependent-type-design.rst&data=04%7C01%7Csimonpj%40microsoft.com%7C7e737205b1e3428cc18208d916210e74%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637565153493133964%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=QjIYtMwzGAKby2bqezO9AmUchHO9zUyGhzSOCJPlTms%3D&reserved=0">
Here it is once more</a><o:p></o:p></p>
<p class="MsoNormal">I have heard <o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo3">Support: Joachim, Vitaly, Alejandro, Vlad (plus Richard and myself)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo3">Against: no one<o:p></o:p></li></ul>
<p class="MsoNormal">But that leaves <b>Tom, Eric, Arnaud, Cale, Simon M, and Iavor</b> who have not expressed an opinion. Please do!<o:p></o:p></p>
<p class="MsoNormal">Failing further feedback, I’ll accept on Tuesday next week.<o:p></o:p></p>
<p class="MsoNormal">There has been some further <a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F378&data=04%7C01%7Csimonpj%40microsoft.com%7C7e737205b1e3428cc18208d916210e74%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637565153493143963%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=lOdCJyt61%2B6elYx1npgMG9BBsrHD1FHg%2BFo0IbylndM%3D&reserved=0">
discussion on the pull request</a>, but I don’t think any fundamentally new points have come up. This is clearly a judgement call, but one I think we should make. Haskell has always been a research lab – that’s part of what makes it distinctive. I think
we can continue to celebrate that innovation. But see my email immediately below for what we are and are not accepting.<o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<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"> Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>>
<br>
<b>Sent:</b> 15 April 2021 10:39<br>
<b>To:</b> <a href="mailto:ghc-steering-committee@haskell.org">ghc-steering-committee@haskell.org</a><br>
<b>Cc:</b> Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>><br>
<b>Subject:</b> Recommendation for #378: support the design for dependent types<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear GHC steering committee<o:p></o:p></p>
<p class="MsoNormal">OK Richard has now revised the “Design for Dependent Types” proposal, and has resubmitted it. As we asked, it now
<i>includes</i> the design sketch that constitutes the direction of travel advocated in the proposal, rather than merely
<i>referring</i> to it.<o:p></o:p></p>
<p class="MsoNormal"><a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fgoldfirere%2Fghc-proposals%2Fblob%2Fdependent-types%2Fproposals%2F0000-dependent-type-design.rst&data=04%7C01%7Csimonpj%40microsoft.com%7C7e737205b1e3428cc18208d916210e74%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637565153493143963%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=wTdlzqgSiFRe5hwoaHG2s6ukIv2eAaEY1M%2F%2FbDxrRII%3D&reserved=0">Here
it is once more</a><o:p></o:p></p>
<p class="MsoNormal">I propose acceptance.<o:p></o:p></p>
<p class="MsoNormal">Remember:<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:2.5pt;mso-list:l0 level1 lfo6">We
<b>would not</b> be accepting every detail of the design in Section 4 – rather, we expect further specific proposals as we move in the direction described in the proposal. So we should not debate the fine print of Section 4.
<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:2.5pt;mso-list:l0 level1 lfo6">We
<b>would</b> be accepting that the proposal describes a direction of travel that we are happy with. That in turn gives people the confidence to invest efforts in those more detailed proposals. As the “Proposed change specification” says: “When evaluating
new proposals, the GHC committee would consider compatibility with the design sketch below. Generally speaking, new proposals should be forward-compatible with the design sketch; that is, the new features proposed would continue to be at home when surrounded
by other dependent-type features.”<o:p></o:p></li></ul>
<p class="MsoNormal">Any views? Questions of clarification or technical questions belong on the comment stream.<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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<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 <<a href="mailto:ghc-steering-committee-bounces@haskell.org">ghc-steering-committee-bounces@haskell.org</a>>
<b>On Behalf Of </b>Simon Peyton Jones via ghc-steering-committee<br>
<b>Sent:</b> 06 April 2021 13:58<br>
<b>To:</b> <a href="mailto:ghc-steering-committee@haskell.org">ghc-steering-committee@haskell.org</a><br>
<b>Subject:</b> Re: [ghc-steering-committee] Recommendation for #378: support the design for dependent types<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Richard and I have discussed this.<o:p></o:p></p>
<p class="MsoNormal">We concluded that we’d put it back into “Needs revision” status. He’s going to expand it (substantially) to include
<i><a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.haskell.org%2Fghc%2Fghc%2F-%2Fwikis%2Fdependent-haskell&data=04%7C01%7Csimonpj%40microsoft.com%7C7e737205b1e3428cc18208d916210e74%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637565153493153956%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=MxflQbPVLwdC0uGcrJ7P%2FkZzsqIgt1vo%2BPfExxjYkS4%3D&reserved=0">the
proposed design sketch of dependent types on the GHC wiki</a>. </i>Then he’ll resubmit in the hope of getting approval of the design in principle, subject to subsequent discussion of the fine detail.<o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<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"> Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>>
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<b>Sent:</b> 29 March 2021 13:17<br>
<b>To:</b> <a href="mailto:ghc-steering-committee@haskell.org">ghc-steering-committee@haskell.org</a><br>
<b>Cc:</b> Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>><br>
<b>Subject:</b> Recommendation for #378: support the design for dependent types<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear GHC Steering Committee<o:p></o:p></p>
<p class="MsoNormal">I’m recommending acceptance of Proposal #378: <a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F378&data=04%7C01%7Csimonpj%40microsoft.com%7C7e737205b1e3428cc18208d916210e74%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637565153493163947%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=VBTZfqvQ8fEISn39rMwYV0zc6uXV8g07l8y4aZ0WcAI%3D&reserved=0">
Support the design for dependent types</a><o:p></o:p></p>
<p class="MsoNormal">As you’ll see, there is a lot of useful context, but the payload is pretty simple<o:p></o:p></p>
<p style="margin-left:36.0pt"><i>When evaluating new proposals, the GHC committee would consider compatibility with
<a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.haskell.org%2Fghc%2Fghc%2F-%2Fwikis%2Fdependent-haskell&data=04%7C01%7Csimonpj%40microsoft.com%7C7e737205b1e3428cc18208d916210e74%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637565153493163947%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=qoyKKGDL%2Fz6JMu%2FC3SMBmjnC24KJFic1i57iG7AG8hY%3D&reserved=0">
the proposed design sketch of dependent types on the GHC wiki</a>. Generally speaking, new proposals should be forward-compatible with the design sketch; that is, the new features proposed would continue to be at home when surrounded by other dependent-type
features.<o:p></o:p></i></p>
<p style="margin-left:36.0pt"><i>Of course, the committee remains free to revise the design sketch or to accept proposals that encroach upon it (i.e. contradicting this guidance), but such choices should be made explicitly.<o:p></o:p></i></p>
<p style="margin-left:36.0pt"><i>See also the committee's <a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2F%23review-criteria&data=04%7C01%7Csimonpj%40microsoft.com%7C7e737205b1e3428cc18208d916210e74%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637565153493173941%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=bz9L49gK5qLs5RArmLvfcOS7GfdMY3FyJm5cthB%2BFI8%3D&reserved=0">
Review Criteria</a>: put another way, this proposal says that we consider the design sketch alongside other features of today's Haskell when assessing a new proposal's fit with the language.<o:p></o:p></i></p>
<p style="margin-left:36.0pt"><i>Note that compatibility with dependent types is far from the only criterion the committee would use to evaluate a proposal. Other review criteria, such as learnability, clarity of error messages, performance, etc., remain just
as ever.<o:p></o:p></i></p>
<p class="MsoNormal">Any views? Let’s try to converge rapidly…. the proposal has been substantially refined by a lot of debate.<o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
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