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<h3>
Krzysztof Gogolewski pushed to branch wip/T18302
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f15edd28eafd5a6bf74d429a85785dbf092eb20">5f15edd2</a></strong>
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<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-12T23:52:48+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">WIP on #18302
Culprit:
pickGREsModExp :: ModuleName -> [GlobalRdrElt] -> [(GlobalRdrElt,GlobalRdrElt)]
-- ^ Pick GREs that are in scope *both* qualified *and* unqualified
-- Return each GRE that is, as a pair
-- (qual_gre, unqual_gre)
-- These two GREs are the original GRE with imports filtered to express how
-- it is in scope qualified an unqualified respectively
--
-- Used only for the 'module M' item in export list;
-- see 'GHC.Tc.Gen.Export.exports_from_avail'
pickGREsModExp mod gres = mapMaybe (pickBothGRE mod) gres
pickBothGRE :: ModuleName -> GlobalRdrElt -> Maybe (GlobalRdrElt, GlobalRdrElt)
pickBothGRE mod gre@(GRE { gre_name = n })
| isBuiltInSyntax n = Nothing
| Just gre1 <- pickQualGRE mod gre
, Just gre2 <- pickUnqualGRE gre = Just (gre1, gre2)
| otherwise = Nothing
where
-- isBuiltInSyntax filter out names for built-in syntax They
-- just clutter up the environment (esp tuples), and the
-- parser will generate Exact RdrNames for them, so the
-- cluttered envt is no use. Really, it's only useful for
-- GHC.Base and GHC.Tuple.
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<h4>2 changed files:</h4>
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<li class="file-stats">
<a href="#8a5cd068459120cddf3814e7b9e02003b87647ba">
compiler/GHC/Builtin/Types/Prim.hs
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<a href="#98b46afb652ad9b66a276d3c312d1262c3838642">
libraries/base/Unsafe/Coerce.hs
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<h4>Changes:</h4>
<li id="8a5cd068459120cddf3814e7b9e02003b87647ba">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f15edd28eafd5a6bf74d429a85785dbf092eb20#8a5cd068459120cddf3814e7b9e02003b87647ba"><strong>compiler/GHC/Builtin/Types/Prim.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -11,8 +11,6 @@ Wired-in knowledge about primitive types</td>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="cd">-- | This module defines TyCons that can't be expressed in Haskell.</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- They are all, therefore, wired-in TyCons. C.f module "GHC.Builtin.Types"</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Builtin.Types.Prim</span><span class="p">(</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">mkPrimTyConName</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- For implicit parameters in GHC.Builtin.Types only</span></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTemplateKindVars</span><span class="p">,</span> <span class="n" style="color: #333;">mkTemplateTyVars</span><span class="p">,</span> <span class="n" style="color: #333;">mkTemplateTyVarsFrom</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTemplateKiTyVars</span><span class="p">,</span> <span class="n" style="color: #333;">mkTemplateKiTyVar</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -402,7 +400,7 @@ multiplicityTyVar = mkTemplateTyVars (repeat multiplicityTy) !! 13 -- selects '</td>
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<pre style="margin: 0;"> <span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"><span class="n" style="color: #333;">funTyConName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;">-<span id="LC405" class="line" lang="haskell"><span class="n" style="color: #333;">funTyConName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimT<span class="idiff left right">yConName</span></span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"FUN"</span><span class="p">)</span> <span class="n" style="color: #333;">funTyConKey</span> <span class="n" style="color: #333;">funTyCon</span></span>
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell"><span class="n" style="color: #333;">funTyConName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimT<span class="idiff left">cName</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">UserSyntax</span></span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"FUN"</span><span class="p">)</span> <span class="n" style="color: #333;">funTyConKey</span> <span class="n" style="color: #333;">funTyCon</span></span>
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="haskell"><span class="cd">-- | The @FUN@ type constructor.</span></span>
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -536,12 +534,7 @@ tYPETyCon = mkKindTyCon tYPETyConName</td>
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If you edit these, you may need to update the GHC formalism</span></span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [GHC Formalism] in GHC.Core.Lint</span></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"><span class="n" style="color: #333;">tYPETyConName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimTyConName</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"TYPE"</span><span class="p">)</span> <span class="n" style="color: #333;">tYPETyConKey</span> <span class="n" style="color: #333;">tYPETyCon</span></span>
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<pre style="margin: 0;">-<span id="LC540" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC541" class="line" lang="haskell"><span class="n" style="color: #333;">mkPrimTyConName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;">-<span id="LC542" class="line" lang="haskell"><span class="n" style="color: #333;">mkPrimTyConName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimTcName</span> <span class="kt" style="color: #458; font-weight: 600;">BuiltInSyntax</span></span>
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- All of the super kinds and kinds are defined in Prim,</span></span>
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<pre style="margin: 0;">-<span id="LC544" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and use BuiltInSyntax, because they are never in scope in the source</span></span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"><span class="n" style="color: #333;">tYPETyConName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimTcName</span> <span class="kt" style="color: #458; font-weight: 600;">UserSyntax</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"TYPE"</span><span class="p">)</span> <span class="n" style="color: #333;">tYPETyConKey</span> <span class="n" style="color: #333;">tYPETyCon</span></span>
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"><span class="n" style="color: #333;">mkPrimTcName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">BuiltInSyntax</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC540" class="line" lang="haskell"><span class="n" style="color: #333;">mkPrimTcName</span> <span class="n" style="color: #333;">built_in_syntax</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">key</span> <span class="n" style="color: #333;">tycon</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f15edd28eafd5a6bf74d429a85785dbf092eb20#98b46afb652ad9b66a276d3c312d1262c3838642"><strong>libraries/base/Unsafe/Coerce.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -24,8 +24,6 @@ import GHC.Arr (amap) -- For amap/unsafeCoerce rule</td>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Base</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Num.Integer</span> <span class="p">()</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Depend on GHC.Num.Integer] in GHC.Base</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types</span></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Implementing unsafeCoerce]</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The implementation of unsafeCoerce is surprisingly subtle.</span></span>
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