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<h3>
Simon Peyton Jones pushed to branch wip/T17923
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/95ecfa58c2b106c5521a4f3738bc7a4b0ca02857">95ecfa58</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-03-18T08:22:44Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Progress
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<h4>1 changed file:</h4>
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<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<h4>Changes:</h4>
<li id="36a42448a83a9d1f6df8475f03ead2eed199dd8e">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/95ecfa58c2b106c5521a4f3738bc7a4b0ca02857#36a42448a83a9d1f6df8475f03ead2eed199dd8e"><strong>compiler/GHC/Core/Lint.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">@@ -575,28 +575,23 @@ lintExpr dflags vars expr</td>
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575
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575
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Check a core binding, returning the list of variables bound.</span></span>
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576
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576
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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577
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577
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"></span>
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578
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="haskell"><span class="n" style="color: #333;">lint<span class="idiff left">SingleBinding</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TopLevelFlag</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RecFlag</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></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 class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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578
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="haskell"><span class="n" style="color: #333;">lint<span class="idiff left">RecBinding</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TopLevelFlag</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RecFlag</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Linted</span>Id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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579
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If you edit this function, you may need to update the GHC formalism</span></span>
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580
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580
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [GHC Formalism]</span></span>
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581
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<pre style="margin: 0;">-<span id="LC581" class="line" lang="haskell"><span class="n" style="color: #333;">lint<span class="idiff left right">Single</span>Binding</span> <span class="n" style="color: #333;">top_lvl_flag</span> <span class="n" style="color: #333;">rec_flag</span> <span class="p">(</span><span class="n" style="color: #333;">binder</span><span class="p">,</span><span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="haskell"><span class="n" style="color: #333;">lint<span class="idiff left right">Rec</span>Binding</span> <span class="n" style="color: #333;">top_lvl_flag</span> <span class="n" style="color: #333;">rec_flag</span> <span class="p">(</span><span class="n" style="color: #333;">binder</span><span class="p">,</span><span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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582
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RhsOf</span> <span class="n" style="color: #333;">binder</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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583
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<pre style="margin: 0;">-<span id="LC583" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check the rhs</span></span>
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584
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<pre style="margin: 0;">-<span id="LC584" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintRhs</span> <span class="n" style="color: #333;">binder</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC585" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">binder_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">applySubstTy</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">binder</span><span class="p">)</span></span>
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586
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<pre style="margin: 0;">-<span id="LC586" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ensureEqTys</span> <span class="n" style="color: #333;">binder_ty</span> <span class="n" style="color: #333;">ty</span> <span class="p">(</span><span class="n" style="color: #333;">mkRhsMsg</span> <span class="n" style="color: #333;">binder</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"RHS"</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintRhs</span> <span class="n" style="color: #333;">binder</span> <span class="n" style="color: #333;">rhs</span> <span class="c1" style="color: #998; font-style: italic;">-- Check the rhs</span></span>
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintLetBinder</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">rec_flag</span> <span class="n" style="color: #333;">binder</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"><span class="n" style="color: #333;">lintRecBinding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RecFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintedId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintedType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell"><span class="n" style="color: #333;">lintLetBinder</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">rec_flag</span> <span class="n" style="color: #333;">binder</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ensureEqTys</span> <span class="n" style="color: #333;">binder_ty</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="p">(</span><span class="n" style="color: #333;">mkRhsMsg</span> <span class="n" style="color: #333;">binder</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"RHS"</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC589" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC590" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If the binding is for a CoVar, the RHS should be (Coercion co)</span></span>
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<pre style="margin: 0;"> <span id="LC591" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Core type and coercion invariant] in GHC.Core</span></span>
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<pre style="margin: 0;"> <span id="LC592" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkL</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isCoVar</span> <span class="n" style="color: #333;">binder</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isCoArg</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC593" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkLetErr</span> <span class="n" style="color: #333;">binder</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC594" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC593" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that it's not levity-polymorphic</span></span>
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<pre style="margin: 0;">-<span id="LC594" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do this first, because otherwise isUnliftedType panics</span></span>
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<pre style="margin: 0;">-<span id="LC595" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Annoyingly, this duplicates the test in lintIdBdr,</span></span>
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<pre style="margin: 0;">-<span id="LC596" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because for non-rec lets we call lintSingleBinding first</span></span>
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<pre style="margin: 0;">-<span id="LC597" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkL</span> <span class="p">(</span><span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">binder</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeLevPoly</span> <span class="n" style="color: #333;">binder_ty</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC598" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">badBndrTyMsg</span> <span class="n" style="color: #333;">binder</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"levity-polymorphic"</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC599" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC595" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check the let/app invariant</span></span>
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<pre style="margin: 0;"> <span id="LC596" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Core let/app invariant] in GHC.Core</span></span>
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<pre style="margin: 0;"> <span id="LC597" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkL</span> <span class="p">(</span> <span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">binder</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">@@ -822,11 +817,12 @@ lintCoreExpr (Let (NonRec tv (Type ty)) body)</td>
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<pre style="margin: 0;"> <span id="LC817" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"><span class="n" style="color: #333;">lintCoreExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Let</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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819
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<pre style="margin: 0;"> <span id="LC819" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;">-<span id="LC825" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">lintSingleBinding</span> <span class="kt" style="color: #458; font-weight: 600;">NotTopLevel</span> <span class="kt" style="color: #458; font-weight: 600;">NonRecursive</span> <span class="p">(</span><span class="n" style="color: #333;">bndr</span><span class="p">,</span><span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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826
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<pre style="margin: 0;">-<span id="LC826" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">addLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BodyOfLetRec</span> <span class="p">[</span><span class="n" style="color: #333;">bndr</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC827" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">lintBinder</span> <span class="kt" style="color: #458; font-weight: 600;">LetBind</span> <span class="n" style="color: #333;">bndr</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC828" class="line" lang="haskell"> <span class="n" style="color: #333;">addGoodJoins</span> <span class="p">[</span><span class="n" style="color: #333;">bndr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">$</span></span>
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829
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<pre style="margin: 0;">-<span id="LC829" class="line" lang="haskell"> <span class="n" style="color: #333;">lintCoreExpr</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC820" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCoreExpr</span> <span class="n" style="color: #333;">rhs</span></span>
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821
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<pre style="margin: 0;">+<span id="LC821" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintBinder</span> <span class="kt" style="color: #458; font-weight: 600;">LetBind</span> <span class="n" style="color: #333;">bndr</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">bndr'</span> <span class="o" style="font-weight: 600;">-></span></span>
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822
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<pre style="margin: 0;">+<span id="LC822" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">lintLetBinder</span> <span class="kt" style="color: #458; font-weight: 600;">NotTopLevel</span> <span class="kt" style="color: #458; font-weight: 600;">NonRecursive</span> <span class="n" style="color: #333;">bndr'</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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823
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<pre style="margin: 0;">+<span id="LC823" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">addLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BodyOfLetRec</span> <span class="p">[</span><span class="n" style="color: #333;">bndr</span><span class="p">])</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"> <span class="n" style="color: #333;">addGoodJoins</span> <span class="p">[</span><span class="n" style="color: #333;">bndr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC825" class="line" lang="haskell"> <span class="n" style="color: #333;">lintCoreExpr</span> <span class="n" style="color: #333;">body</span> <span class="p">}</span> <span class="p">}</span></span>
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826
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"></span>
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827
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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832
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828
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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">failWithL</span> <span class="p">(</span><span class="n" style="color: #333;">mkLetErr</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Not quite accurate</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1138" 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="diff-line-num unfold js-unfold new_line" data-linenumber="1134" 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">@@ -1138,10 +1134,10 @@ lintCaseExpr scrut var alt_ty alts =</td>
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1138
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1134
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<pre style="margin: 0;"> <span id="LC1134" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Join points are less general than the paper]</span></span>
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1139
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1135
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<pre style="margin: 0;"> <span id="LC1135" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Core</span></span>
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1140
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1136
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<pre style="margin: 0;"> <span id="LC1136" class="line" lang="haskell"></span>
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1141
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<pre style="margin: 0;">-<span id="LC1141" class="line" lang="haskell"> <span class="p">;</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">alt_ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CaseTy</span> <span class="n" style="color: #333;">scrut</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1142
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<pre style="margin: 0;">-<span id="LC1142" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">lintValueType</span> <span class="n" style="color: #333;">alt_ty</span></span>
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<pre style="margin: 0;">-<span id="LC1143" class="line" lang="haskell"> <span class="p">;</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">var_ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdTy</span> <span class="n" style="color: #333;">var</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1144" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">lintValueType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1137" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left right">alt_ty</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CaseTy</span> <span class="n" style="color: #333;">scrut</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1138" class="line" lang="haskell"> <span class="n" style="color: #333;">lintValueType</span> <span class="n" style="color: #333;">alt_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1139" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left right">var_ty</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdTy</span> <span class="n" style="color: #333;">var</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1140" class="line" lang="haskell"> <span class="n" style="color: #333;">lintValueType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1141" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1142" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We used to try to check whether a case expression with no</span></span>
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<pre style="margin: 0;"> <span id="LC1143" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- alternatives was legitimate, but this didn't work.</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">@@ -1333,14 +1329,15 @@ lintIdBndr top_lvl bind_site id linterF</td>
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<pre style="margin: 0;"> <span id="LC1329" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkL</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isExternalName</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">varName</span> <span class="n" style="color: #333;">id</span><span class="p">))</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">is_top_lvl</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1330" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkNonTopExternalNameMsg</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1331" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1336" class="line" lang="haskell"> <span class="p">;</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">id_ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdTy</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1337" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">lintValueType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1332" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left right">id_ty</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdTy</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1333" class="line" lang="haskell"> <span class="n" style="color: #333;">lintValueType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1334" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">id'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIdType</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">id_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1335" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1336" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Levity polymorphism invariants] in GHC.Core</span></span>
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<pre style="margin: 0;">-<span id="LC1341" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">lf_check_levity_poly</span> <span class="n" style="color: #333;">flags</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isKindLevPoly</span> <span class="n" style="color: #333;">k</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC1342" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Levity-polymorphic binder:"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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<pre style="margin: 0;">-<span id="LC1343" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">id_ty</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">k</span><span class="p">)))</span></span>
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<pre style="margin: 0;">+<span id="LC1337" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintL</span> <span class="p">(</span><span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">lf_check_levity_poly</span> <span class="n" style="color: #333;">flags</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1338" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeLevPoly</span> <span class="n" style="color: #333;">id_ty</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1339" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Levity-polymorphic binder:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span></span>
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<pre style="margin: 0;">+<span id="LC1340" class="line" lang="haskell"> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">id_ty</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">id_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1341" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1342" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that a join-id is a not-top-level let-binding</span></span>
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<pre style="margin: 0;"> <span id="LC1343" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2404" 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>
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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">@@ -2404,9 +2401,6 @@ getTCvSubst = LintM (\ env errs -> (Just (le_subst env), errs))</td>
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<pre style="margin: 0;"> <span id="LC2401" class="line" lang="haskell"><span class="n" style="color: #333;">getInScope</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span></span>
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2402
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<pre style="margin: 0;"> <span id="LC2402" class="line" lang="haskell"><span class="n" style="color: #333;">getInScope</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">errs</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">getTCvInScope</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">le_subst</span> <span class="n" style="color: #333;">env</span><span class="p">),</span> <span class="n" style="color: #333;">errs</span><span class="p">))</span></span>
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2403
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<pre style="margin: 0;"> <span id="LC2403" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2407" class="line" lang="haskell"><span class="n" style="color: #333;">applySubstTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="kt" style="color: #458; font-weight: 600;">OutType</span></span>
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<pre style="margin: 0;">-<span id="LC2408" class="line" lang="haskell"><span class="n" style="color: #333;">applySubstTy</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTCvSubst</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2409" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2404" class="line" lang="haskell"><span class="n" style="color: #333;">lookupIdInScope</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span></span>
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<pre style="margin: 0;"> <span id="LC2405" class="line" lang="haskell"><span class="n" style="color: #333;">lookupIdInScope</span> <span class="n" style="color: #333;">id_occ</span></span>
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<pre style="margin: 0;"> <span id="LC2406" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">in_scope_ids</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInScopeIds</span></span>
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