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<p class="MsoNormal"><span style="font-size:12.0pt">I’m actually mildly in favour of the proposed design.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">The main reason for rejection is really<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">* It’s a change<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Change is always a bit disruptive; and no one is arguing strongly that they really really want this.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">So maybe we should just “park” it as OK in principle, but without sufficient support to justify the (hard to quantify) changeover costs.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Simon <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><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"> ghc-steering-committee <ghc-steering-committee-bounces@haskell.org>
<b>On Behalf Of </b>Vitaly Bragilevsky<br>
<b>Sent:</b> 16 August 2018 01:37<br>
<b>To:</b> ghc-steering-committee@haskell.org<br>
<b>Subject:</b> [ghc-steering-committee] Proposal: Lazy unboxed tuples / warn on unbanged strict patterns (#35); Recommendation: Reject<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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Hi,<o:p></o:p></p>
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<o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm">
the lazy unboxed tuples proposal (<a href="https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fghc-proposals%2Fghc-proposals%2Fpull%2F35&data=02%7C01%7Csimonpj%40microsoft.com%7C983115e9eee64eb4b03c08d603107655%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636699766583676606&sdata=PXTsCrM4otm8ZCEFZvNfkydSBo6J77zh5qb9CVNmZX8%3D&reserved=0">https://github.com/ghc-proposals/ghc-proposals/pull/35</a>)
was under discussion for a long period of time (more than a year and a half since submission).<o:p></o:p></p>
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<o:p> </o:p></p>
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As a shepherd to this proposal I recommend rejection based on the following:<o:p></o:p></p>
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<o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm">
* there is no clearly articulated motivation in favor of this proposal despite complying with the Manual;<o:p></o:p></p>
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* implementing this would lead to hard-to-trace performance issues in the users code (due to move from strictness in current GHC behaviour to laziness);<o:p></o:p></p>
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* it looks like the change (B) of the proposal (warn an unbanged strict patterns) meets no complains, so it is better to be resubmitted as a separate proposal;<o:p></o:p></p>
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* if resubmitted separately the change (A) should elaborate on desugaring to make potential performance drawbacks clear;<o:p></o:p></p>
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* it seems (maybe mistakenly) that the author has lost his interest in this proposal.<o:p></o:p></p>
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<o:p> </o:p></p>
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Although silence is undestood as agreement, I'd be glad to receive a feedback on this recommendation.<o:p></o:p></p>
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<o:p> </o:p></p>
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Regards,<o:p></o:p></p>
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Vitaly<o:p></o:p></p>
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