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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">The new TH is already
<a href="https://ghc.haskell.org/trac/ghc/blog/Template%20Haskell%20Proposal">split into two parts</a> as I’m sure you know<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol;mso-fareast-language:EN-US"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Typed TH is for expressions only, and doesn’t have reify, nor any Q monad.
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol;mso-fareast-language:EN-US"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Untyped TH is the wild west<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Typed TH may get some of what you want? Certainly you want to acknowledge the existing split in your own design.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">The proposal could do with examples to illustrate what the difficulties are. What bad things happen in the Q monad? Can you give examples of reasoning that would
be valid in level 1 but not in level 2. etc. More precision please!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Glasgow-haskell-users [mailto:glasgow-haskell-users-bounces@haskell.org]
<b>On Behalf Of </b>Greg Weber<br>
<b>Sent:</b> 30 January 2015 23:39<br>
<b>To:</b> ghc-devs@haskell.org; GHC users<br>
<b>Cc:</b> David Terei; Maxwell Swadling<br>
<b>Subject:</b> Restricted Template Haskell<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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Hello GHC friends!<o:p></o:p></p>
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<o:p> </o:p></p>
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I am starting up a proposal for variants of Template Haskell that restrict what operations are available. The goal is to make TH easier for users to reason about and to allow for an easier compilation story.<o:p></o:p></p>
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<o:p> </o:p></p>
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Here is the proposal page:<o:p></o:p></p>
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<a href="https://ghc.haskell.org/trac/ghc/wiki/TemplateHaskell/Restricted">https://ghc.haskell.org/trac/ghc/wiki/TemplateHaskell/Restricted</a><o:p></o:p></p>
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<o:p> </o:p></p>
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Right now the proposal does not have any details and the goal is to write out a clear specification.<o:p></o:p></p>
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If this sounds interesting to you, let me know or leave some feedback on the wiki.<o:p></o:p></p>
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<o:p> </o:p></p>
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<o:p> </o:p></p>
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Thanks,<o:p></o:p></p>
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Greg Weber<o:p></o:p></p>
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<o:p> </o:p></p>
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<o:p> </o:p></p>
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