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PUBLIC<br>
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<p class="msipheader7557e74b" style="margin:0in"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#317100">PUBLIC</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">“settings”? Honestly, I have no idea. GHC looks at these files in the directory passed to runGhc, and in my local setup I have some convoluted ghc-lib-based system to persist
these files and also the base package.db into a Stack/cabal-installable package, but these are only needed for environments where there’s no bona-fide GHC build directory.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">I am sure even without Hadrian, you should have these files somewhere under your build directory, since otherwise the same same runGhc function (used inside the GHC executable
as well…) wouldn’t work. Maybe someone else with non-Hadrian knowledge can tell you where these files are put in the non-Hadrian build.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> Simon Peyton Jones <simonpj@microsoft.com>
<br>
<b>Sent:</b> Tuesday, October 19, 2021 4:08 PM<br>
<b>To:</b> Erdi, Gergo <Gergo.Erdi@sc.com>; 'Matthew Pickering' <matthewtpickering@gmail.com><br>
<b>Cc:</b> Montelatici, Raphael Laurent <Raphael.Montelatici@sc.com>; 'GHC' <ghc-devs@haskell.org><br>
<b>Subject:</b> [External] RE: Specialisation doesn't kick in -- NOW WITH MINIMAL WORKING EXAMPLE (RE: Instantiation of overloaded definition *in Core*)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal">Yes I have a full build. No it was not built with Hadrian. I did not realise that your system relied not only on GHC as a library, but also on the build system that you use to build GHC.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I guess I can try that, but probably not today. But what is “settings”?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span style="font-size:8.0pt;mso-fareast-language:EN-GB">PS: I am leaving Microsoft at the end of November 2021, at which point
<a href="mailto:simonpj@microsoft.com"><span style="color:#0563C1">simonpj@microsoft.com</span></a> will cease to work. Use
<a href="mailto:simon.peytonjones@gmail.com"><span style="color:#0563C1">simon.peytonjones@gmail.com</span></a> instead. (For now, it just forwards to
<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>.)<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt">
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> Erdi, Gergo <<a href="mailto:Gergo.Erdi@sc.com">Gergo.Erdi@sc.com</a>>
<br>
<b>Sent:</b> 19 October 2021 09:03<br>
<b>To:</b> Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>>; 'Matthew Pickering' <<a href="mailto:matthewtpickering@gmail.com">matthewtpickering@gmail.com</a>><br>
<b>Cc:</b> Montelatici, Raphael Laurent <<a href="mailto:Raphael.Montelatici@sc.com">Raphael.Montelatici@sc.com</a>>; 'GHC' <<a href="mailto:ghc-devs@haskell.org">ghc-devs@haskell.org</a>><br>
<b>Subject:</b> RE: Specialisation doesn't kick in -- NOW WITH MINIMAL WORKING EXAMPLE (RE: Instantiation of overloaded definition *in Core*)<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p style="margin:15.0pt"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#317100">PUBLIC<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<div>
<p class="msipheader7557e74b" style="margin:0in"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#317100">PUBLIC</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Do you have a full GHC build there? Are you using Hadrian? Did you set `libDir`’s definition in the source file to where you have GHC built? I just tried, and if I remove the
files from my GHC build, I am able to rebuild them:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console";mso-fareast-language:EN-GB">mi@localhost[ghc] $ for i in settings llvm-passes llvm-targets; do rm ~/prog/ghc/_build/stage1/lib/$i; done<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console";mso-fareast-language:EN-GB">mi@localhost[ghc] $ for i in settings llvm-passes llvm-targets; do ./hadrian/build-stack _build/stage1/lib/$i; done<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console";color:#00BF00;mso-fareast-language:EN-GB">| Successfully generated _build/stage1/lib/settings.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console";color:#00BF00;mso-fareast-language:EN-GB">Build completed in 0.41s<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console";color:#00BF00;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console";color:#BF00BF;mso-fareast-language:EN-GB">| Copy file: llvm-passes => _build/stage1/lib/llvm-passes<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console";color:#00BF00;mso-fareast-language:EN-GB">Build completed in 0.40s<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console";color:#00BF00;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console";color:#BF00BF;mso-fareast-language:EN-GB">| Copy file: llvm-targets => _build/stage1/lib/llvm-targets<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console";color:#00BF00;mso-fareast-language:EN-GB">Build completed in 0.52s<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>>
<br>
<b>Sent:</b> Tuesday, October 19, 2021 3:54 PM<br>
<b>To:</b> Erdi, Gergo <<a href="mailto:Gergo.Erdi@sc.com">Gergo.Erdi@sc.com</a>>; 'Matthew Pickering' <<a href="mailto:matthewtpickering@gmail.com">matthewtpickering@gmail.com</a>><br>
<b>Cc:</b> Montelatici, Raphael Laurent <<a href="mailto:Raphael.Montelatici@sc.com">Raphael.Montelatici@sc.com</a>>; 'GHC' <<a href="mailto:ghc-devs@haskell.org">ghc-devs@haskell.org</a>><br>
<b>Subject:</b> [External] RE: Specialisation doesn't kick in -- NOW WITH MINIMAL WORKING EXAMPLE (RE: Instantiation of overloaded definition *in Core*)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">As for opening a ticket – a big part of the problem is that I don’t even know yet if I’m doing something wrong, or GHC is! So it’s not clear what the
ticket would even be for – “I’m using the GHC API wrongly” is not a strong bug report
</span><span style="font-size:10.0pt;font-family:"Segoe UI Emoji",sans-serif">😊</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Plenty of tickets turn out to be non-bugs. But they are still searchable, and form a permanent record that may help others, perhaps in unexpected ways. So I encourage you to
do so.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">I successfully compiled the attached Main.hs with HEAD, passing ‘-package ghc’ as a command line argument.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">When I run it I get
<o:p></o:p></span></p>
<p class="Code">simonpj@MSRC-3645512:~/tmp$ ./gergo<o:p></o:p></p>
<p class="Code">Missing file: /home/simonpj/code/HEAD-1/compiler/stage1/build/settings<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">So now I’m stuck again.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:8.0pt;mso-fareast-language:EN-GB">PS: I am leaving Microsoft at the end of November 2021, at which point
<a href="mailto:simonpj@microsoft.com"><span style="color:#0563C1">simonpj@microsoft.com</span></a> will cease to work. Use
<a href="mailto:simon.peytonjones@gmail.com"><span style="color:#0563C1">simon.peytonjones@gmail.com</span></a> instead. (For now, it just forwards to
<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>.)<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"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> Erdi, Gergo <<a href="mailto:Gergo.Erdi@sc.com">Gergo.Erdi@sc.com</a>>
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<b>Sent:</b> 19 October 2021 02:57<br>
<b>To:</b> Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>>; 'Matthew Pickering' <<a href="mailto:matthewtpickering@gmail.com">matthewtpickering@gmail.com</a>><br>
<b>Cc:</b> Montelatici, Raphael Laurent <<a href="mailto:Raphael.Montelatici@sc.com">Raphael.Montelatici@sc.com</a>>; 'GHC' <<a href="mailto:ghc-devs@haskell.org">ghc-devs@haskell.org</a>><br>
<b>Subject:</b> RE: Specialisation doesn't kick in -- NOW WITH MINIMAL WORKING EXAMPLE (RE: Instantiation of overloaded definition *in Core*)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p style="margin:15.0pt"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#317100">PUBLIC<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
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<p class="msipheader7557e74b" style="margin:0in"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#317100">PUBLIC</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Thanks for looking into this!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">`Paths_ghc_lib` is referenced just because I am using GHC via ghc-lib. You can of course instead use a local full build of GHC for the libDir. Please find an updated version
attached that does that – you’ll just have to adapt the definition of `libDir` to your environment.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">As for opening a ticket – a big part of the problem is that I don’t even know yet if I’m doing something wrong, or GHC is! So it’s not clear what the ticket would even be for
– “I’m using the GHC API wrongly” is not a strong bug report </span><span style="font-size:10.0pt;font-family:"Segoe UI Emoji",sans-serif">😊</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>>
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<b>Sent:</b> Saturday, October 16, 2021 12:52 AM<br>
<b>To:</b> Erdi, Gergo <<a href="mailto:Gergo.Erdi@sc.com">Gergo.Erdi@sc.com</a>>; 'Matthew Pickering' <<a href="mailto:matthewtpickering@gmail.com">matthewtpickering@gmail.com</a>><br>
<b>Cc:</b> Montelatici, Raphael Laurent <<a href="mailto:Raphael.Montelatici@sc.com">Raphael.Montelatici@sc.com</a>>; 'GHC' <<a href="mailto:ghc-devs@haskell.org">ghc-devs@haskell.org</a>><br>
<b>Subject:</b> [External] RE: Specialisation doesn't kick in -- NOW WITH MINIMAL WORKING EXAMPLE (RE: Instantiation of overloaded definition *in Core*)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
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<p class="MsoNormal">I could not compile Main.hs:<o:p></o:p></p>
<p class="Code">~/code/HEAD-1/inplace/bin/ghc-stage1 -c Gergo.hs -package ghc<o:p></o:p></p>
<p class="Code"><o:p> </o:p></p>
<p class="Code">Gergo.hs:4:1: error:<o:p></o:p></p>
<p class="Code"> Could not find module ‘Paths_ghc_lib’<o:p></o:p></p>
<p class="Code"> Use -v (or `:set -v` in ghci) to see a list of the files searched for.<o:p></o:p></p>
<p class="Code"> |<o:p></o:p></p>
<p class="Code">4 | import qualified Paths_ghc_lib as GHC<o:p></o:p></p>
<p class="Code"> | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<o:p></o:p></p>
<p class="Code">simonpj@MSRC-3645512:~/tmp$<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Would you like to open a ticket rather than do this by email?<o:p></o:p></p>
<p class="MsoNormal"><br>
Simon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;mso-fareast-language:EN-GB">PS: I am leaving Microsoft at the end of November 2021, at which point
<a href="mailto:simonpj@microsoft.com"><span style="color:#0563C1">simonpj@microsoft.com</span></a> will cease to work. Use
<a href="mailto:simon.peytonjones@gmail.com"><span style="color:#0563C1">simon.peytonjones@gmail.com</span></a> instead. (For now, it just forwards to
<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>.)<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"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> Erdi, Gergo <<a href="mailto:Gergo.Erdi@sc.com">Gergo.Erdi@sc.com</a>>
<br>
<b>Sent:</b> 15 October 2021 05:35<br>
<b>To:</b> Simon Peyton Jones <<a href="mailto:simonpj@microsoft.com">simonpj@microsoft.com</a>>; 'Matthew Pickering' <<a href="mailto:matthewtpickering@gmail.com">matthewtpickering@gmail.com</a>><br>
<b>Cc:</b> Montelatici, Raphael Laurent <<a href="mailto:Raphael.Montelatici@sc.com">Raphael.Montelatici@sc.com</a>>; 'GHC' <<a href="mailto:ghc-devs@haskell.org">ghc-devs@haskell.org</a>><br>
<b>Subject:</b> RE: Specialisation doesn't kick in -- NOW WITH MINIMAL WORKING EXAMPLE (RE: Instantiation of overloaded definition *in Core*)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p style="margin:15.0pt"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#317100">PUBLIC<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
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<p class="msipheader7557e74b" style="margin:0in"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#317100">PUBLIC</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">OK I now have a standalone demonstrator that shows, at least, that the default method implementation is not specialized. With the attached input programs, the resulting Core
(using GHC </span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-GB">e46edfcf47d674731935b2ea1443cc7927e071fb) is as follows (only showing the relevant parts):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB">seq :: forall (m :: * -> *) a b. Monad m => m a -> m b -> m b<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB">seq<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> = \ (@(m :: * -> *)) (v_srS [Occ=Once1!] :: Monad m) -><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> case v_srS of { C:Monad _ [Occ=Dead] v_srV [Occ=Once1] -> v_srV }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB">$dmseq :: forall (m :: * -> *) a b. Monad m => m a -> m b -> m b<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB">$dmseq<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> = \ (@(m :: * -> *))<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> ($dMonad [Occ=Once1] :: Monad m)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> (@a)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> (@b)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> (ma [Occ=Once1] :: m a)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> (mb [Occ=OnceL1] :: m b) -><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> let {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> sat_ss0 [Occ=Once1] :: a -> m b<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> [LclId]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> sat_ss0 = \ _ [Occ=Dead] -> mb } in<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"> bind @m $dMonad @a @b ma sat_ss0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB">$fMonadIO :: Monad IO<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB">$fMonadIO = C:Monad @IO bindIO $fMonadIO_$cseq;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB">$fMonadIO_$cseq :: forall a b. IO a -> IO b -> IO b<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB">$fMonadIO_$cseq = \ (@a) (@b) -> $dmseq @IO $fMonadIO @a @b;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB">foo :: IO ()<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Lucida Console";mso-fareast-language:EN-GB">foo = seq @IO $fMonadIO @() @() ioA ioA<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-GB">If I turn on Opt_D_dump_spec, I can see that specializer *<b>is</b>* running, it just doesn’t *<b>do</b>* anything.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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