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<p class="MsoNormal" style="margin-left:36.0pt">Based on repeated recent experience, I expect getting rid of Rank2Types to be another substantial source of make-work for library authors. The GHC upgrade path has been very bumpy indeed recently, and this seems
assured to continue that unhappy trend. I respectfully request that you silently retain Rank2Types as a synonym for RankNTypes.<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D">Do you mean “silently and forever”? Deprecation simply means that everything continues to work, but you get a little nudge to change. Isn’t that what it’s
for? If you treat deprecation as equivalent to error, then there isn’t much point in having it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D">It’s possible that making Rank2Types = RankNTypes silently and forever is the right answer. It just doesn’t feel right to me. But I’m not a library author
and I don’t feel terribly strongly. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Bryan O'Sullivan [mailto:bos@serpentine.com]
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<b>Sent:</b> 22 October 2012 17:06<br>
<b>To:</b> Simon Peyton-Jones<br>
<b>Cc:</b> johan.tibell@gmail.com; Don Stewart; Duncan Coutts; Roman Leshchinskiy; ashley@semantic.org; cabal-devel@haskell.org; Ben Lippmeier; Manuel M T Chakravarty; cvs-ghc@haskell.org<br>
<b>Subject:</b> Re: deprecating<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">On Fri, Oct 19, 2012 at 11:49 AM, Simon Peyton-Jones <<a href="mailto:simonpj@microsoft.com" target="_blank">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"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Dear maintainers of</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">bytestring</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">cabal</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif""> vector</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">time</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">dph</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi, Simon -<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">How did you come up with this list? It is missing the vast majority of users of Rank2Types.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Most people embed language pragmas directly into the source files that use them, so grepping .cabal files is going to massively undercount users of any given feature.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Based on repeated recent experience, I expect getting rid of Rank2Types to be another substantial source of make-work for library authors. The GHC upgrade path has been very bumpy indeed recently, and this seems assured to continue that
unhappy trend. I respectfully request that you silently retain Rank2Types as a synonym for RankNTypes.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">Bryan.<o:p></o:p></p>
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