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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I also argue that, to be consistent, whatever keyword we agree, we should use it<o:p></o:p></span></p>
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<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span style="mso-fareast-language:EN-US">In the (accepted) infix/WARNING proposal<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span style="mso-fareast-language:EN-US">In import and export lists – presumably for now in addition to ‘pattern’, though we might end up deprecating the latter.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Vitaly Bragilevsky <bravit111@gmail.com>
<br>
<b>Sent:</b> 08 March 2019 14:44<br>
<b>To:</b> Simon Peyton Jones <simonpj@microsoft.com><br>
<b>Cc:</b> Simon Marlow <marlowsd@gmail.com>; ghc-steering-committee <ghc-steering-committee@haskell.org><br>
<b>Subject:</b> Re: [ghc-steering-committee] #167: Deprecated Entities, rec: accept<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Simon PJ argues for "value" over "data" as a specifier: <a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F167%23issuecomment-470947193&data=02%7C01%7Csimonpj%40microsoft.com%7C21374ae23fcf4793082708d6a3d48b1a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636876530599100730&sdata=s8VbHAxHZb3vUqXKJXq%2FVMuIiPYwGzPWNJCyE6mWgTU%3D&reserved=0">https://github.com/ghc-proposals/ghc-proposals/pull/167#issuecomment-470947193</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'm fine with this choice either (and I'm satisfied with the argument that deprecating or setting fixity for value "value" is a rare case to be considered seriously). If you have another opinion, please, speak up.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Vitaly<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, Mar 8, 2019 at 11:42 AM Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’ve made a post on the proposal thread asking why we don’t just follow the already-adopted proposal for WARNING and infix pragmas.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Simon<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> ghc-steering-committee <<a href="mailto:ghc-steering-committee-bounces@haskell.org" target="_blank">ghc-steering-committee-bounces@haskell.org</a>>
<b>On Behalf Of </b>Simon Marlow<br>
<b>Sent:</b> 08 March 2019 07:57<br>
<b>To:</b> Vitaly Bragilevsky <<a href="mailto:bravit111@gmail.com" target="_blank">bravit111@gmail.com</a>><br>
<b>Cc:</b> ghc-steering-committee <<a href="mailto:ghc-steering-committee@haskell.org" target="_blank">ghc-steering-committee@haskell.org</a>><br>
<b>Subject:</b> Re: [ghc-steering-committee] #167: Deprecated Entities, rec: accept</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Yes, I think this is the right way to go.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Cheers<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Simon<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Fri, 8 Mar 2019 at 05:25, Vitaly Bragilevsky <<a href="mailto:bravit111@gmail.com" target="_blank">bravit111@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi everyone, <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I was asked to shepherd the proposal #167 (Deprecated Entities,
<a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnineonine%2Fghc-proposals%2Fblob%2Fdepr-entities%2Fproposals%2F0000-deprecated-entities.rst&data=02%7C01%7Csimonpj%40microsoft.com%7C21374ae23fcf4793082708d6a3d48b1a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636876530599110725&sdata=7Ahx5YEJjUcvj7TAR7Y%2Bli5fFDp5O7uH1y5XPOR07Nc%3D&reserved=0" target="_blank">
https://github.com/nineonine/ghc-proposals/blob/depr-entities/proposals/0000-deprecated-entities.rst</a>). It is proposed to extend (nonpositional) DEPRECATED pragma with the two specifiers to disambiguate deprecating named type-level and value-level things.
In its current formulation, the proposal suggests to use the specifiers "type" for type-level things and "pattern" for value-level things as follows:<br>
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data Bar = Bar<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">{-# DEPRECATED type Bar "Don't use type Bar" #-} <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">data Baz = Baz<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">{-# DEPRECATED pattern Baz "Don't use data constructor Baz" #-}<br>
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Using this pragma without specifiers should mean deprecating both (as is works now).<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">After discussing this proposal within the committee (see
<a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail.haskell.org%2Fpipermail%2Fghc-steering-committee%2F2019-February%2F000894.html&data=02%7C01%7Csimonpj%40microsoft.com%7C21374ae23fcf4793082708d6a3d48b1a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636876530599110725&sdata=qtZe%2Bwn%2Fz770ILSA7Yx50OxzYyXTSr2wJjgDice2yFU%3D&reserved=0" target="_blank">
https://mail.haskell.org/pipermail/ghc-steering-committee/2019-February/000894.html</a>), I recommend acceptance with one change, namely using "data" instead of "pattern" for deprecating value-level things. <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Reasons for choosing "data":<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">* it's a reserved keyword (as opposed to "value", which is another option)<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">* we are deprecating data constructors here<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">* it just feels right (sorry!)<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Reasons against "data":<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">* it can be confusing whether we mean data type or data constructor<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">* we use "value" and "pattern" in other places meaning basically the same thing<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">If the committee decides to go this way, then the wider community may think about other proposals, such as<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">* adding positional DEPRECATED pragmas (including class instances deprecation)<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">* fixing inconsistencies with the fixity declarations (<a href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fblob%2Fmaster%2Fproposals%2F0008-type-infix.rst&data=02%7C01%7Csimonpj%40microsoft.com%7C21374ae23fcf4793082708d6a3d48b1a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636876530599120719&sdata=ZQa8twzFBzNPyUte52GBna0Igb7qGnyqAZrhUps7emM%3D&reserved=0" target="_blank">https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0008-type-infix.rst</a>)
and updating ExplicitNamespaces in import/export lists<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">* deprecating usage of nonpositional DEPRECATED pragma without the specifiers<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Silence is understood as agreement. <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Regards, <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">Vitaly<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">_______________________________________________<br>
ghc-steering-committee mailing list<br>
<a href="mailto:ghc-steering-committee@haskell.org" target="_blank">ghc-steering-committee@haskell.org</a><br>
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