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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">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 <simonpj@microsoft.com>
<br>
<b>Sent:</b> Saturday, October 16, 2021 12:52 AM<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">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>
<div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt">
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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>
<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">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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