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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">I’m sympathetic to supporting GHCJS. But, as described in my email, there seems to be several different proposals for extending
plugins swirling around, and I’m not sure how they relate to each other.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">My suggestion (for you guys to lead
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D;mso-fareast-language:EN-US">J</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">):
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D;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-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Identify the minimum necessary for GHCJS in 7.8<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D;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-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Debate the remaining proposals under less time pressure<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;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""> Carter Schonwald [mailto:carter.schonwald@gmail.com]
<br>
<b>Sent:</b> 23 August 2013 19:36<br>
<b>To:</b> Daniel F<br>
<b>Cc:</b> Simon Peyton-Jones; ghc-devs<br>
<b>Subject:</b> Re: extending GHC plugins with Hooks<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" style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm">
indeed, ghcjs is one of the things i'm most looking forward to!<o:p></o:p></p>
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That the hooks machinery needed to nicely support GHCJS will enable many other use cases is also something i'm excited about too... would be a shame for neither to work with 7.8 ....<o:p></o:p></p>
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<o:p> </o:p></p>
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-Carter<o:p></o:p></p>
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<o:p> </o:p></p>
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On Fri, Aug 23, 2013 at 2:09 PM, Daniel F <<a href="mailto:difrumin@gmail.com" target="_blank">difrumin@gmail.com</a>> wrote:<o:p></o:p></p>
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Hello<o:p></o:p></p>
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<o:p> </o:p></p>
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On Thu, Aug 22, 2013 at 8:13 PM, 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:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Luite, Edsko, Thomas, Nicolas</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">You have all variously proposed improvements to the GHC API and/or the plug-in mechanism. I have
been so swamped in the last few months that I have not had a chance to look carefully at your proposals, nor how they relate to each other.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">We are now only three weeks away from wanting to do a feature freeze on GHC 7.8, and there are a
lot of other things that we want to complete</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
<a href="http://ghc.haskell.org/trac/ghc/wiki/Status/GHC-7.8" target="_blank">http://ghc.haskell.org/trac/ghc/wiki/Status/GHC-7.8</a></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">(Mostly they have gestating for some time.)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">So I’m hoping you’ll be ok with not putting these plugin-related changes into 7.8. I have the sense
that they’d benefit from more discussion among the folk interested in plugins. Perhaps some of the ideas could be combined nicely; I don’t know. And the people who are going to write plugins are also probably up for building HEAD anyhow.</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" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">(Exception: Luite, I think you have some fairly narrow, specific changes that would help GHCJS, and
I’m probably fine with those if you care to send patches.)</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" style="margin-bottom:12.0pt">Does this mean that GHCJS patches will be accepted, but it has to use some other mechanism (not Hooks)?<br>
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It would be really nice to see ghcjs support in the upcoming GHC.<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:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Please say if you think there’s a really strong reason for putting stuff in the 7.8.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Simon</span><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" 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"">
ghc-devs [mailto:<a href="mailto:ghc-devs-bounces@haskell.org" target="_blank">ghc-devs-bounces@haskell.org</a>]
<b>On Behalf Of </b>Luite Stegeman<br>
<b>Sent:</b> 21 August 2013 03:51<br>
<b>To:</b> ghc-devs<br>
<b>Subject:</b> extending GHC plugins with Hooks</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;margin-bottom:6.0pt">hi all,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">Sorry for taking so long to get back with this. I'm proposing a somewhat general way for adding 'hooks' to the GHC API, where users can override parts of the default compiling pipeline.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">Hooks are simply functions or actions that replace existing compiler functionality. This means that usually only one application can use a specific hook at a time. <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">The obvious data structure to store the hooks is DynFlags. Unfortunately defining hooks in DynFlags directly would give birth to the mother of all import cycles, and it would also break
the split-dll scheme on Windows. So here's the idea:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- Define each hook in the module where it's exported<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- For each hook make a 'phantom' DataType and an instance for the Hook type familiy<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- Add a TypeRep based map in DynFlags [0]<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- For each hooked function, check for existence of a hook in DynFlags, otherwise run the default. Example: <a href="https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L83" target="_blank">https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L83</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">Now this approach does have some disadvantages:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- No clear integration with existing plugins (I've tried adding an onLoadPlugin field to Plugin, where the Plugin could update DynFlags when it's loaded, but it was a bit messy, and plugins
would not be loaded in time for some hooks, particularly what Edsko needs)<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- More of GHC depends on type families<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- Decentralized hooks definitions feel a bit messy<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">So I'm open to suggestions for improvements (or replacements) of this scheme. I have some time the coming weeks to clean up or change the patch.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">We've been testing some hooks with GHCJS for a while, and so far they seem to provide what we need (but I'm going to doublecheck the coming weeks that we don't have missing functionality):<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- Customizations for linking JavaScript code with our own library locations [1]<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- Hooking into the DriverPipeline so we can use the compilation manager [2]<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- Desugaring customizations to remove some C-isms from the FFI code [3]<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- Typechecking foreign import javascript imports [4]<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">- Override the built-in GHC.Prim so we can customize primop types [5]<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">I think it's easy to add those for Edsko and Thomas as well.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">luite<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">[0] <a href="https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L239" target="_blank">
https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L239</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">[1] <a href="https://github.com/ghcjs/ghcjs/blob/master/src/Compiler/GhcjsHooks.hs#L44" target="_blank">
https://github.com/ghcjs/ghcjs/blob/master/src/Compiler/GhcjsHooks.hs#L44</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">[2] <a href="https://github.com/ghcjs/ghcjs/blob/master/src/Compiler/GhcjsHooks.hs#L192" target="_blank">https://github.com/ghcjs/ghcjs/blob/master/src/Compiler/GhcjsHooks.hs#L192</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"><a href="https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L335" target="_blank">https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L335</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">[3] <a href="https://github.com/ghcjs/ghcjs/blob/master/src/Gen2/Foreign.hs#L67" target="_blank">https://github.com/ghcjs/ghcjs/blob/master/src/Gen2/Foreign.hs#L67</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"><a href="https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L83" target="_blank">https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L83</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">[4] <a href="https://github.com/ghcjs/ghcjs/blob/master/src/Gen2/Foreign.hs#L68" target="_blank">https://github.com/ghcjs/ghcjs/blob/master/src/Gen2/Foreign.hs#L68</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"><a href="https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L1374" target="_blank">https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L1374</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">[5] <a href="https://github.com/ghcjs/ghcjs/blob/master/src/Compiler/GhcjsHooks.hs#L191" target="_blank">https://github.com/ghcjs/ghcjs/blob/master/src/Compiler/GhcjsHooks.hs#L191</a><o:p></o:p></p>
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<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"><a href="https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L239" target="_blank">https://github.com/ghcjs/ghcjs-build/blob/master/refs/patches/ghc-ghcjs.patch#L239</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt">(sorry the linked patch also contains other modifications required for GHCJS, that i'm going to submit separately)<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:6.0pt"> <o:p></o:p></p>
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</div>
</div>
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</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt">_______________________________________________<br>
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</blockquote>
</div>
<p class="MsoNormal"><span style="color:#888888"><br>
<br clear="all">
<br>
<span class="hoenzb">-- </span><br>
<span class="hoenzb">Sincerely yours,</span><br>
<span class="hoenzb">-- Daniil Frumin</span></span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
_______________________________________________<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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