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<p class="MsoNormal">I’ll mark this accepted on Wednesday, unless anyone else wants to express an opinion, or offer an alternative.<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> 23 February 2021 15:06<br>
<b>To:</b> ghc-steering-committee <ghc-steering-committee@haskell.org><br>
<b>Cc:</b> Simon Peyton Jones <simonpj@microsoft.com><br>
<b>Subject:</b> Modification to record dot syntax propsal<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">Please see <a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F405&data=04%7C01%7Csimonpj%40microsoft.com%7Caa27192c62ab448a4e2c08d8d80c8937%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637496895641978235%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=oJDy%2BiYI4kEaC%2FUJIfZbph2JnZr%2FTK%2F5aZqA6djwF3A%3D&reserved=0">
this proposal #405 to split RecordDotSyntax into two extensions</a><o:p></o:p></p>
<p class="MsoNormal">It is a small modification of #282 on record dot syntax. The top comment gives links to the versions of the proposal before and after the change.<o:p></o:p></p>
<p class="MsoNormal">The main payload is:<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo3">Instead of RecordDotSyntax, have to independent extensions, OverloadedRecordDot and OverloadedRecordUpdates.<o:p></o:p></li></ul>
<p>I recommend acceptance of this proposal, but invite the committee’s view on one point (the final bullet below). Here is the thinking<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo6">
<code><span style="font-size:10.0pt;mso-fareast-language:EN-GB">RecordDotSyntax</span></code><span style="mso-fareast-language:EN-GB"> is the extension that we will eventually want programmers to user. It will probably ultimately imply
</span><code><span style="font-size:10.0pt;mso-fareast-language:EN-GB">NoFieldSelectors</span></code><span style="mso-fareast-language:EN-GB">. But we aren’t quite ready make that choice yet. So we don’t want to specify exactly what
</span><code><span style="font-size:10.0pt;mso-fareast-language:EN-GB">RecordDotSyntax</span></code><span style="mso-fareast-language:EN-GB"> does yet.<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo6">
<span style="mso-fareast-language:EN-GB">So we want another, less ambitious, extension to enable record-dot syntax itself, and its desugaring into
</span><code><span style="font-size:10.0pt;mso-fareast-language:EN-GB">getField</span></code><span style="mso-fareast-language:EN-GB">; and similarly for record updates.<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo6">
<span style="mso-fareast-language:EN-GB">This patch to the proposal goes just a little further, by dis-aggregating into two independent extensions,
</span><code><span style="font-size:10.0pt;mso-fareast-language:EN-GB">OverloadedRecordDot</span></code><span style="mso-fareast-language:EN-GB"> and
</span><code><span style="font-size:10.0pt;mso-fareast-language:EN-GB">OverloadedRecordUpdates</span></code><span style="mso-fareast-language:EN-GB">.<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo6">
<span style="mso-fareast-language:EN-GB">An alternative, if the committee prefers, would be to have a single extension (say,
</span><code><span style="font-size:10.0pt;mso-fareast-language:EN-GB">OverloadedRecords</span></code><span style="mso-fareast-language:EN-GB">).<o:p></o:p></span></li></ul>
<p class="MsoNormal">Please express your opinion. This should not take us long. (Technical and clarification questions would be best done on the Githhub thread, as always.)<o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
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