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<h3>
Simon Peyton Jones pushed to branch wip/T8095-spj
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/ce39b22bdfeee800aa09394110213ad0487e6168">ce39b22b</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-08-04T13:38:05+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Free-var fixes
This should stop the perf regressions
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<h4>3 changed files:</h4>
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<li class="file-stats">
<a href="#039e8f5676356ef05c90af828aae48aac7296e47">
compiler/GHC/Core/TyCo/FVs.hs
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<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">
compiler/GHC/Core/TyCo/Rep.hs
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<a href="#07389a8f0516c26409d86f6bb651ed00759b5d4c">
compiler/GHC/Tc/Instance/Family.hs
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<h4>Changes:</h4>
<li id="039e8f5676356ef05c90af828aae48aac7296e47">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce39b22bdfeee800aa09394110213ad0487e6168#039e8f5676356ef05c90af828aae48aac7296e47"><strong>compiler/GHC/Core/TyCo/FVs.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">@@ -25,7 +25,7 @@ module GHC.Core.TyCo.FVs</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Injective free vars</span></span>
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<td class="diff-line-num old_line" data-linenumber="27" 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">
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">injectiveVarsOfType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">injectiveVarsOfTypes</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">invisibleVarsOfType</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">invisibleVarsOfType</span>s</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">invisibleVarsOfTypes</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No Free vars</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">noFreeVarsOfType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">noFreeVarsOfTypes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">noFreeVarsOfCo</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="221" 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="221" 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">@@ -221,7 +221,7 @@ kind are free.</td>
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<pre style="margin: 0;"> <span id="LC221" 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="LC222" 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="LC223" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Acumulating parameter free variables]</span></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Ac<span class="idiff left right">c</span>umulating parameter free variables]</span></span>
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<pre style="margin: 0;"> <span id="LC225" 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="LC226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We can use foldType to build an accumulating-parameter version of a</span></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">free-var finder, thus:</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">@@ -271,7 +271,16 @@ emptyInScope = emptyVarSet</td>
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<pre style="margin: 0;"> <span id="LC271" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="haskell"><span class="n" style="color: #333;">runTyCoVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFvFun</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span></span>
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE runTyCoVars #-}</span></span>
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<pre style="margin: 0;">-<span id="LC274" class="line" lang="haskell"><span class="n" style="color: #333;">runTyCoVars</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">appEndo</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">emptyInScope</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"><span class="n" style="color: #333;">runTyCoVars</span> <span class="n" style="color: #333;">f</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;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">appEndo</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">emptyInScope</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's very important that the \x is to the right of the '=', so</span></span>
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- runTyCoVars has arity 1. It is often applied to just one arg e.g.</span></span>
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tyCoVarsOfType = runTyCoVars deep_ty</span></span>
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We want runTyCoVars to inline, so that deep_ty is applied to two args,</span></span>
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- which in turn makes deep_ty eta-expand. Without that eta-expansion,</span></span>
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- deep_ty is dreadfully inefficient.</span></span>
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC282" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we put the \x to the left of the '=', runTyCoVars would only</span></span>
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inline when applied to /two/ arguments.</span></span>
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<pre style="margin: 0;"> <span id="LC284" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC285" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC286" 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">@@ -281,22 +290,20 @@ runTyCoVars f x = appEndo (f emptyInScope x) emptyVarSet</td>
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<pre style="margin: 0;"> <span id="LC290" 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="LC291" 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="LC292" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC284" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span></span>
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<pre style="margin: 0;">-<span id="LC285" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runTyCoVars</span> <span class="n" style="color: #333;">deep_ty</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC286" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Alternative:</span></span>
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<pre style="margin: 0;">-<span id="LC287" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tyCoVarsOfType ty = closeOverKinds (shallowTyCoVarsOfType ty)</span></span>
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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Free variables of Coercions]</span></span>
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span></span>
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span></span>
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runTyCoVars</span> <span class="n" style="color: #333;">deep_tys</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Alternative:</span></span>
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<pre style="margin: 0;">-<span id="LC292" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tyCoVarsOfTypes tys = closeOverKinds (shallowTyCoVarsOfTypes tys)</span></span>
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfCos</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC294" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Free variables of Coercions]</span></span>
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runTyCoVars</span> <span class="n" style="color: #333;">deep_co</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runTyCoVars</span> <span class="n" style="color: #333;">deep_ty</span></span>
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runTyCoVars</span> <span class="n" style="color: #333;">deep_tys</span></span>
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runTyCoVars</span> <span class="n" style="color: #333;">deep_co</span></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfCos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runTyCoVars</span> <span class="n" style="color: #333;">deep_cos</span></span>
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC298" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">tyCoVarsOfCos</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">Coercion</span></span><span class="p"><span class="idiff">]</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 right">TyCoVarSet</span></span></span>
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<pre style="margin: 0;">-<span id="LC299" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">tyCoVarsOfCos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cos</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">runTyCoVars</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">deep_cos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cos</span></span></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- Alternative for tyCoVarsOfType</span></span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- tyCoVarsOfType ty = closeOverKinds (shallowTyCoVarsOfType ty)</span></span></span>
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<pre style="margin: 0;"> <span id="LC307" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC308" class="line" lang="haskell"><span class="n" style="color: #333;">deep_ty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFvFun</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span></span>
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<pre style="margin: 0;"> <span id="LC309" class="line" lang="haskell"><span class="n" style="color: #333;">deep_tys</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFvFun</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</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">@@ -866,26 +873,32 @@ injectiveVarsOfTypes look_under_tfs = mapUnionFV (injectiveVarsOfType look_under</td>
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<pre style="margin: 0;"> <span id="LC873" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * In a coercion</span></span>
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * In a Specified or Inferred argument to a function</span></span>
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [VarBndrs, TyCoVarBinders, TyConBinders, and visibility] in "GHC.Core.TyCo.Rep"</span></span>
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869
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<pre style="margin: 0;">-<span id="LC869" class="line" lang="haskell"><span class="n" style="color: #333;">invisibleVarsOfType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FV</span></span>
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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"><span class="n" style="color: #333;">invisibleVarsOfType</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span></span>
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871
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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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872
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreView</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty'</span></span>
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874
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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875
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">f</span> <span class="p">`</span><span class="n" style="color: #333;">unionFV</span><span class="p">`</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">w</span> <span class="p">`</span><span class="n" style="color: #333;">unionFV</span><span class="p">`</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1</span> <span class="p">`</span><span class="n" style="color: #333;">unionFV</span><span class="p">`</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty2</span></span>
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877
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoFVsOfTypes</span> <span class="n" style="color: #333;">invisibles</span> <span class="p">`</span><span class="n" style="color: #333;">unionFV</span><span class="p">`</span></span>
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<pre style="margin: 0;">-<span id="LC878" class="line" lang="haskell"> <span class="n" style="color: #333;">invisibleVarsOfTypes</span> <span class="n" style="color: #333;">visibles</span></span>
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879
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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="n" style="color: #333;">invisibles</span><span class="p">,</span> <span class="n" style="color: #333;">visibles</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionInvisibleTypes</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="n" style="color: #333;">tvb</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoFVsBndr</span> <span class="n" style="color: #333;">tvb</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">LitTy</span><span class="p">{}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyFV</span></span>
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<pre style="margin: 0;">-<span id="LC882" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoFVsOfCo</span> <span class="n" style="color: #333;">co</span> <span class="p">`</span><span class="n" style="color: #333;">unionFV</span><span class="p">`</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC883" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoFVsOfCo</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">-<span id="LC884" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC885" class="line" lang="haskell"><span class="cd">-- | Like 'invisibleVarsOfType', but for many types.</span></span>
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<pre style="margin: 0;">-<span id="LC886" class="line" lang="haskell"><span class="n" style="color: #333;">invisibleVarsOfTypes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FV</span></span>
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<pre style="margin: 0;">-<span id="LC887" class="line" lang="haskell"><span class="n" style="color: #333;">invisibleVarsOfTypes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapUnionFV</span> <span class="n" style="color: #333;">invisibleVarsOfType</span></span>
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<pre style="margin: 0;">-<span id="LC888" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"><span class="n" style="color: #333;">invisibleVarsOfTypes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"><span class="n" style="color: #333;">invisibleVarsOfTypes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runTyCoVars</span> <span class="n" style="color: #333;">invis_tys</span></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="n" style="color: #333;">invis_tys</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFvFun</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"><span class="n" style="color: #333;">invis_tys</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span></span>
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"><span class="n" style="color: #333;">invis_tys</span> <span class="n" style="color: #333;">is</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;">tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">ty</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span> <span class="n" style="color: #333;">invis_tys</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"><span class="n" style="color: #333;">invis_ty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFvFun</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"><span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreView</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"><span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">v</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">is</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span></span>
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<pre style="margin: 0;">+<span id="LC889" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">deep_ty</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC890" class="line" lang="haskell"><span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">f</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span> <span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC891" class="line" lang="haskell"><span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">w</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span> <span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">ty1</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span> <span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">ty2</span></span>
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892
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<pre style="margin: 0;">+<span id="LC892" class="line" lang="haskell"><span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">deep_tys</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">invisibles</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span></span>
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<pre style="margin: 0;">+<span id="LC893" class="line" lang="haskell"> <span class="n" style="color: #333;">invis_tys</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">visibles</span></span>
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894
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="n" style="color: #333;">invisibles</span><span class="p">,</span> <span class="n" style="color: #333;">visibles</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionInvisibleTypes</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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895
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<pre style="margin: 0;">+<span id="LC895" class="line" lang="haskell"><span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="n" style="color: #333;">tvb</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span></span>
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<pre style="margin: 0;">+<span id="LC896" class="line" lang="haskell"> <span class="n" style="color: #333;">invis_ty</span> <span class="p">(</span><span class="n" style="color: #333;">is</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC897" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC898" class="line" lang="haskell"> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binderVar</span> <span class="n" style="color: #333;">tvb</span></span>
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899
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"><span class="n" style="color: #333;">invis_ty</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">LitTy</span><span class="p">{}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span></span>
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900
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<pre style="margin: 0;">+<span id="LC900" class="line" lang="haskell"><span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">deep_co</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">co</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span> <span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">ty</span></span>
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901
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<pre style="margin: 0;">+<span id="LC901" class="line" lang="haskell"><span class="n" style="color: #333;">invis_ty</span> <span class="n" style="color: #333;">is</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">deep_co</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">co</span></span>
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902
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<pre style="margin: 0;"> <span id="LC902" class="line" lang="haskell"></span>
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903
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<pre style="margin: 0;"> <span id="LC903" 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="LC904" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce39b22bdfeee800aa09394110213ad0487e6168#578c7c3857d66d963736ff6742f3433a0e8d01b7"><strong>compiler/GHC/Core/TyCo/Rep.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">@@ -1962,12 +1962,14 @@ foldTyCo (TyCoFolder { tcf_view = view</td>
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1962
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1962
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<pre style="margin: 0;"> <span id="LC1962" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1963
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1963
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<pre style="margin: 0;"> <span id="LC1963" class="line" lang="haskell"> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tycobinder</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tv</span> <span class="kt" style="color: #458; font-weight: 600;">Inferred</span></span>
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1964
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1964
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<pre style="margin: 0;"> <span id="LC1964" class="line" lang="haskell"></span>
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1965
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<pre style="margin: 0;">-<span id="LC1965" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZapCoProv</span> <span class="n" style="color: #333;">cvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">strictFoldDVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">mappend</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">covar</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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1966
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<pre style="margin: 0;">-<span id="LC1966" class="line" lang="haskell"> <span class="n" style="color: #333;">mempty</span> <span class="n" style="color: #333;">cvs</span></span>
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1965
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<pre style="margin: 0;">+<span id="LC1965" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ZapCoProv</span> <span class="n" style="color: #333;">cvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_cvs</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">dVarSetElems</span> <span class="n" style="color: #333;">cvs</span><span class="p">)</span></span>
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1967
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1966
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<pre style="margin: 0;"> <span id="LC1966" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhantomProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">co</span></span>
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1968
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1967
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<pre style="margin: 0;"> <span id="LC1967" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">co</span></span>
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1969
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1968
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<pre style="margin: 0;"> <span id="LC1968" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span></span>
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1970
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1969
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<pre style="margin: 0;"> <span id="LC1969" class="line" lang="haskell"></span>
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1970
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<pre style="margin: 0;">+<span id="LC1970" class="line" lang="haskell"> <span class="n" style="color: #333;">go_cvs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span></span>
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1971
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<pre style="margin: 0;">+<span id="LC1971" class="line" lang="haskell"> <span class="n" style="color: #333;">go_cvs</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">cv</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">cvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">covar</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">cv</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span> <span class="n" style="color: #333;">go_cvs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">cvs</span></span>
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1972
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<pre style="margin: 0;">+<span id="LC1972" class="line" lang="haskell"></span>
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1971
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1973
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<pre style="margin: 0;"> <span id="LC1973" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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1972
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1974
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<pre style="margin: 0;"> <span id="LC1974" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1973
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1975
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<pre style="margin: 0;"> <span id="LC1975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> typeSize, coercionSize</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce39b22bdfeee800aa09394110213ad0487e6168#07389a8f0516c26409d86f6bb651ed00759b5d4c"><strong>compiler/GHC/Tc/Instance/Family.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">@@ -918,7 +918,7 @@ unusedInjTvsInRHS dflags tycon@(tyConInjectivityInfo -> Injective inj_list) lhs</td>
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918
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="haskell"></span>
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919
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919
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<pre style="margin: 0;"> <span id="LC919" class="line" lang="haskell"> <span class="n" style="color: #333;">any_bad</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">bad_vars</span></span>
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920
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"></span>
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921
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<pre style="margin: 0;">-<span id="LC921" class="line" lang="haskell"> <span class="n" style="color: #333;">invis_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">fvVarSet</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">invisibleVarsOfTypes</span> <span class="p">[</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tycon</span> <span class="n" style="color: #333;">lhs</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">]</span></span>
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921
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<pre style="margin: 0;">+<span id="LC921" class="line" lang="haskell"> <span class="n" style="color: #333;">invis_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">invisibleVarsOfTypes</span> <span class="p">[</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tycon</span> <span class="n" style="color: #333;">lhs</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">]</span></span>
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922
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922
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC923" class="line" lang="haskell"> <span class="n" style="color: #333;">any_invisible</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">any_bad</span> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">bad_vars</span> <span class="p">`</span><span class="n" style="color: #333;">intersectsVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">invis_vars</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"> <span class="n" style="color: #333;">suggest_undec</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">any_bad</span> <span class="o" style="font-weight: 600;">&&</span></span>
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