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<h3>
Sebastian Graf pushed to branch wip/T18645
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9280042ca55ccd66d3e419e41e62a2bd2e28bd6f">9280042c</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-09-10T16:04:51+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hackily decouple the parser from the desugarer
In a hopefully temporary hack, I re-used the idea from !1957 of using a
nullary type family to break the dependency from GHC.Driver.Hooks on the
definition of DsM ("Abstract Data").
This in turn broke the last dependency from the parser to the desugarer.
More details in `Note [The Decoupling Abstract Data Hack]`.
In the future, we hope to undo this hack again in favour of breaking the
dependency from the parser to DynFlags altogether.
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<h4>2 changed files:</h4>
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<a href="#8e72a25145f803aab964beb710b25dd6cd38aafc">
compiler/GHC/Driver/Hooks.hs
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<li class="file-stats">
<a href="#b2fd0f5f3e0bc9dcc507931c0b7388bf10e925c2">
compiler/GHC/HsToCore/Types.hs
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<h4>Changes:</h4>
<li id="8e72a25145f803aab964beb710b25dd6cd38aafc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9280042ca55ccd66d3e419e41e62a2bd2e28bd6f#8e72a25145f803aab964beb710b25dd6cd38aafc"><strong>compiler/GHC/Driver/Hooks.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">@@ -3,7 +3,7 @@</td>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: this module is SOURCE-imported by DynFlags, and should primarily</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- refer to *types*, rather than *code*</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP, RankNTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP, RankNTypes<span class="idiff left right">, TypeFamilies</span> #-}</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Driver.Hooks</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Hooks</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">@@ -11,6 +11,7 @@ module GHC.Driver.Hooks</td>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupHook</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getHooked</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the hooks:</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DsForeignsHook</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dsForeignsHook</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcForeignImportsHook</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcForeignExportsHook</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">@@ -36,9 +37,7 @@ import GHC.Driver.Types</td>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.Decls</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.Binds</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.Expr</span></span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.OrdList</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types</span></span>
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<pre style="margin: 0;">-<span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Types</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Reader</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="58" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -59,6 +58,7 @@ import GHC.Hs.Extension</td>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.StgToCmm.Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ModuleLFInfos</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC63" 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="LC64" class="line" lang="haskell"><span class="cm" 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">@@ -90,9 +90,32 @@ emptyHooks = Hooks</td>
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90
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cmmToRawCmmHook</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [The Decoupling Abstract Data Hack]</span></span>
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<pre style="margin: 0;">+<span id="LC94" 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="LC95" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The "Abstract Data" idea is due to Richard Eisenberg in</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">https://gitlab.haskell.org/ghc/ghc/-/merge_requests/1957, where the pattern is</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">described in more detail.</span></span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here we use it as a temporary measure to break the dependency from the Parser on</span></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the Desugarer until the parser is free of DynFlags. We introduced a nullary type</span></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">family @DsForeignsook@, whose single definition is in GHC.HsToCore.Types, where</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we instantiate it to</span></span>
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103
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"></span>
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104
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [LForeignDecl GhcTc] -> DsM (ForeignStubs, OrdList (Id, CoreExpr))</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"></span>
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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In doing so, the Hooks module (which is an hs-boot dependency of DynFlags) can</span></span>
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<td class="diff-line-num new new_line" data-linenumber="107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
107
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be decoupled from its use of the DsM definition in GHC.HsToCore.Types. Since</span></span>
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108
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">both DsM and the definition of @ForeignsHook@ live in the same module, there is</span></span>
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109
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">virtually no difference for plugin authors that want to write a foreign hook.</span></span>
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110
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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111
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"></span>
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112
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The Decoupling Abstract Data Hack]</span></span>
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113
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">DsForeignsHook</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Data</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Kind</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"></span>
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93
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Hooks</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Hooks</span></span>
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94
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<pre style="margin: 0;">-<span id="LC94" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">dsForeignsHook</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">LForeignDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span></span>
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95
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<pre style="margin: 0;">-<span id="LC95" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignStubs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)))</span></span>
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116
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">dsForeignsHook</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">DsForeignsHook</span></span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Actual type:</span></span>
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118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @Maybe ([LForeignDecl GhcTc] -> DsM (ForeignStubs, OrdList (Id, CoreExpr)))@</span></span>
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96
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119
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcForeignImportsHook</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">LForeignDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span></span>
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97
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120
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LForeignDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">GlobalRdrElt</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcForeignExportsHook</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">LForeignDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9280042ca55ccd66d3e419e41e62a2bd2e28bd6f#b2fd0f5f3e0bc9dcc507931c0b7388bf10e925c2"><strong>compiler/GHC/HsToCore/Types.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies, UndecidableInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="cd">-- | Various types used during desugaring.</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.Types</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">DsLclEnv</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">DsGblEnv</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</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">@@ -10,13 +12,17 @@ import GHC.Types.CostCentre.State</td>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Env</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LForeignDecl</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcRnIf</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">IfGblEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">IfLclEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CompleteMatches</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">HsToCore</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">PmCheck</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nablas</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FamInstEnv</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Error</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Unit.Module</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Hooks</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsForeignsHook</span><span class="p">)</span></span>
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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.Data.OrdList</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OrdList</span><span class="p">)</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.Driver.Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignStubs</span><span class="p">)</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="cm" style="color: #998; font-style: italic;">{-</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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -75,3 +81,5 @@ data DsMetaVal</td>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"><span class="cd">-- | Desugaring monad. See also 'TcM'.</span></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcRnIf</span> <span class="kt" style="color: #458; font-weight: 600;">DsGblEnv</span> <span class="kt" style="color: #458; font-weight: 600;">DsLclEnv</span></span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The Decoupling Abstract Data Hack]</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DsForeignsHook</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LForeignDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignStubs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">OrdList</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">))</span></span></pre>
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