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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/72570fae2861bc85df0f78e5efdd6743f1208191">72570fae</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-08-05T11:53:56+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Two perf wibbles
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d35f1fefd24846dee79a6572c6b957309814d3fd">d35f1fef</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-08-05T12:57:42+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Further wibbles
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<h4>3 changed files:</h4>
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<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="#89a2e0e1a3095c7a42b10f2819049908908080e8">
compiler/GHC/Core/Unify.hs
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<h4>Changes:</h4>
<li id="039e8f5676356ef05c90af828aae48aac7296e47">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/c5deeadeb1f90b47beab9d91dcb5095b22581efd...d35f1fefd24846dee79a6572c6b957309814d3fd#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">@@ -268,13 +268,17 @@ type InScopeBndrs = TyCoVarSet</td>
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoAcc</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TCA'</span> <span class="p">{</span> <span class="n" style="color: #333;">runTCA</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InScopeBndrs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">acc</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">acc</span><span class="o" style="font-weight: 600;">.</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InScopeBndrs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">acc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoAcc</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See GHC.Core.Unify Note [The one-shot state monad trick]</span></span>
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# COMPLETE TCA #-}</span></span>
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TCA'</span> <span class="n" style="color: #333;">f</span></span>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TCA'</span> <span class="p">(</span><span class="n" style="color: #333;">oneShot</span> <span class="n" style="color: #333;">f</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC277" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Semigroup</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCoAcc</span> <span class="n" style="color: #333;">acc</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC277" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">f1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">f2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f2</span> <span class="n" style="color: #333;">is</span> <span class="p">(</span><span class="n" style="color: #333;">f1</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">acc</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">f1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">f2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f1</span> <span class="n" style="color: #333;">is</span> <span class="p">(</span><span class="n" style="color: #333;">f2</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">acc</span><span class="p">))</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;">-- It makes a perf difference going f1 (f2 acc), rather</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;">-- than f2 (f1 acc). In a short-cutting situation (e.g.</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;">-- a boolean accumulator, people put the short-cut first.</span></span>
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# INLINE (<>) #-}</span></span>
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<pre style="margin: 0;"> <span id="LC283" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC284" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCoAcc</span> <span class="n" style="color: #333;">acc</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</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">@@ -287,21 +291,25 @@ emptyInScope :: InScopeBndrs</td>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"><span class="n" style="color: #333;">emptyInScope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyVarSet</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="LC293" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCoVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoAcc</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoAcc</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="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Add a variable tcv, and the extras, to the free vars unless</span></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;">-- <span class="idiff left right">tcv is in the in-scope</span></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;">-- <span class="idiff left right">or is already in the in-scope set-</span></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;">-- <span class="idiff left right">The 'extras' start</span> from an empty in-scope set;</span></span>
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<pre style="margin: 0;">-<span id="LC294" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- see Note [Closing over free variable kinds]</span></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCoVar</span> <span class="n" style="color: #333;">tcv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">add_<span class="idiff left right">extra</span>s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">add_it</span></span>
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">If 'tcv' is (a) in scope or (b) in the accumulator, then do nothing</span></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;">-- <span class="idiff left right">Otherwise:</span></span></span>
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right"> - Add 'tcv' to the accumulator, and</span></span></span>
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right"> - Run 'add_kind_fvs' starting</span> from an empty in-scope set;</span></span>
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right"> </span>see Note [Closing over free variable kinds]</span></span>
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCoVar</span> <span class="n" style="color: #333;">tcv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">add_<span class="idiff left right">kind_fv</span>s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">add_it</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="haskell"> <span class="n" style="color: #333;">add_it</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tcv</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;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tcv</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;">-<span id="LC300" 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;">add_<span class="idiff left right">extra</span>s</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">acc</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tcv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC304" 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;">add_<span class="idiff left right">kind_fv</span>s</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">acc</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tcv</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="haskell"><span class="n" style="color: #333;">extendInScope</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoAcc</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoAcc</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC307" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Gather the argument free vars in an empty in-scope set</span></span>
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="haskell"><span class="n" style="color: #333;">extendInScope</span> <span class="n" style="color: #333;">tcv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</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;">tcv</span><span class="p">)</span> <span class="n" style="color: #333;">acc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"><span class="n" style="color: #333;">extendInScope</span> <span class="n" style="color: #333;">tcv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TCA</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">is'</span> <span class="o" style="font-weight: 600;">=</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;">tcv</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">is'</span> <span class="n" style="color: #333;">acc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Making this strict removes a thunk, which reduces</span></span>
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- allocation slightly; and the in-scope set is consulted</span></span>
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- at every variable occurrence anyway</span></span>
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC314" class="line" lang="haskell"><span class="n" style="color: #333;">whenNotInScope</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoAcc</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoAcc</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If tcv is not in the in-scope set, compute</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/c5deeadeb1f90b47beab9d91dcb5095b22581efd...d35f1fefd24846dee79a6572c6b957309814d3fd#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">@@ -1819,11 +1819,15 @@ coercion witnessing the reduction. The reduction will proceed as follows:</td>
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<pre style="margin: 0;"> <span id="LC1819" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~> S (S (S (Z + S Z))) |> CoAx2 (CoAx2 (CoAx2 Refl))</span></span>
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<pre style="margin: 0;"> <span id="LC1820" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~> S (S (S (S (S Z)))) |> CoAx1 (CoAx2 (CoAx2 (CoAx2 Refl)))</span></span>
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<pre style="margin: 0;"> <span id="LC1821" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Moreover, coercions are really only useful when validating core transformations</span></span>
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<pre style="margin: 0;">-<span id="LC1823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(i.e. by the Core Linter). To avoid burdening users who aren't linting with the</span></span>
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<pre style="margin: 0;">-<span id="LC1824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cost of maintaining these structures, we replace coercions with placeholders</span></span>
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<pre style="margin: 0;">-<span id="LC1825" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">("zap" them) them unless -dcore-lint is enabled. These placeholders are</span></span>
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1826
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<pre style="margin: 0;">-<span id="LC1826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">represented by UnivCo with ZappedProv provenance. Concretely, a coercion</span></span>
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1822
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<pre style="margin: 0;">+<span id="LC1822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This looks linear, but the type arguments to CoAx2 are of size N, N-1</span></span>
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1823
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<pre style="margin: 0;">+<span id="LC1823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">etc; hence quadratic.</span></span>
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1824
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<pre style="margin: 0;">+<span id="LC1824" class="line" lang="haskell"></span>
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1825
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<pre style="margin: 0;">+<span id="LC1825" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Moreover, coercions are really only useful when validating core</span></span>
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1826
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<pre style="margin: 0;">+<span id="LC1826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">transformations (i.e. by the Core Linter). To avoid burdening users</span></span>
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1827
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<pre style="margin: 0;">+<span id="LC1827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">who aren't linting with the cost of maintaining these structures, we</span></span>
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1828
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<pre style="margin: 0;">+<span id="LC1828" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">replace coercions with placeholders ("zap" them) them unless</span></span>
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1829
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<pre style="margin: 0;">+<span id="LC1829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-dcore-lint is enabled. These placeholders are represented by UnivCo</span></span>
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1830
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<pre style="margin: 0;">+<span id="LC1830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with ZappedProv provenance. Concretely, a coercion</span></span>
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1827
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1831
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<pre style="margin: 0;"> <span id="LC1831" class="line" lang="haskell"></span>
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1828
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1832
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<pre style="margin: 0;"> <span id="LC1832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co :: t1 ~r t2</span></span>
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1829
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1833
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<pre style="margin: 0;"> <span id="LC1833" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1974" 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="1978" 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">@@ -1974,6 +1978,8 @@ keyword):</td>
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1974
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1978
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<pre style="margin: 0;"> <span id="LC1978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to avoid unsound floating. This means that the free variable lists of zapped</span></span>
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1975
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1979
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<pre style="margin: 0;"> <span id="LC1979" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> coercions loaded from interface files will lack top-level things (e.g. type</span></span>
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1976
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1980
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<pre style="margin: 0;"> <span id="LC1980" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constructors) that appear only in the unzapped proof.</span></span>
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1981
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<pre style="margin: 0;">+<span id="LC1981" class="line" lang="haskell"></span>
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1982
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<pre style="margin: 0;">+<span id="LC1982" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* coercionSize gives a smaller size, of course.</span></span>
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1977
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1983
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<pre style="margin: 0;"> <span id="LC1983" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1978
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1984
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<pre style="margin: 0;"> <span id="LC1984" class="line" lang="haskell"></span>
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1979
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1985
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<pre style="margin: 0;"> <span id="LC1985" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2083" 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">@@ -2077,6 +2083,7 @@ data TyCoFolder a</td>
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2077
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2083
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<pre style="margin: 0;"> <span id="LC2083" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Coercion holes] in "GHC.Core.TyCo.Rep".</span></span>
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2078
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2084
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<pre style="margin: 0;"> <span id="LC2084" class="line" lang="haskell"></span>
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2079
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2085
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<pre style="margin: 0;"> <span id="LC2085" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_tycobinder</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArgFlag</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="n" style="color: #333;">a</span></span>
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2086
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<pre style="margin: 0;">+<span id="LC2086" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Modify the result of folding over the body of the forall</span></span>
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2080
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2087
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<pre style="margin: 0;"> <span id="LC2087" class="line" lang="haskell"> <span class="p">}</span></span>
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2081
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2088
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<pre style="margin: 0;"> <span id="LC2088" class="line" lang="haskell"></span>
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2082
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2089
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<pre style="margin: 0;"> <span id="LC2089" class="line" lang="haskell"><span class="n" style="color: #333;">noView</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;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- Simplest form of tcf_view</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2107" 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="2114" 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">@@ -2107,7 +2114,7 @@ foldTyCo (TyCoFolder { tcf_view = view</td>
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2107
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2114
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<pre style="margin: 0;"> <span id="LC2114" class="line" lang="haskell"> <span class="n" style="color: #333;">go_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">vis</span><span class="p">)</span> <span class="n" style="color: #333;">inner</span><span class="p">)</span></span>
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2108
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2115
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<pre style="margin: 0;"> <span id="LC2115" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_ty</span> <span class="p">(</span><span class="n" style="color: #333;">varType</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 class="n" style="color: #333;">tycobinder</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">vis</span> <span class="p">(</span><span class="n" style="color: #333;">go_ty</span> <span class="n" style="color: #333;">inner</span><span class="p">)</span></span>
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2109
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2116
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<pre style="margin: 0;"> <span id="LC2116" class="line" lang="haskell"></span>
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2110
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<pre style="margin: 0;">-<span id="LC2110" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Explicit recursion bec<span class="idiff left right">ua</span>se using foldr builds a local</span></span>
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2117
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<pre style="margin: 0;">+<span id="LC2117" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Explicit recursion bec<span class="idiff left right">au</span>se using foldr builds a local</span></span>
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2111
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2118
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<pre style="margin: 0;"> <span id="LC2118" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- loop (with free) and I'm not confident it'll be</span></span>
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2112
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2119
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<pre style="margin: 0;"> <span id="LC2119" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- lambda lifted in the end</span></span>
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2113
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2120
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<pre style="margin: 0;"> <span id="LC2120" class="line" lang="haskell"> <span class="n" style="color: #333;">go_tys</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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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2154" 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">@@ -2147,8 +2154,9 @@ foldTyCo (TyCoFolder { tcf_view = view</td>
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2147
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2154
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<pre style="margin: 0;"> <span id="LC2154" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</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="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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2148
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2155
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<pre style="margin: 0;"> <span id="LC2155" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This use of dVarSetElems does a sort, which seems very</span></span>
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2149
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2156
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<pre style="margin: 0;"> <span id="LC2156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inefficient. But it seems required for determinism, alas.</span></span>
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2150
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<pre style="margin: 0;">-<span id="LC2150" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Unless the 'a' is instantiated with a non-deterministic kind</span></span>
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2151
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<pre style="margin: 0;">-<span id="LC2151" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of thing...could we exploit that somehow? ToDo.</span></span>
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2157
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<pre style="margin: 0;">+<span id="LC2157" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Unless the 'a' is instantiated with a commutative monoid,</span></span>
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<pre style="margin: 0;">+<span id="LC2158" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- such as (VarSet -> VarSet) ...could we exploit that somehow?</span></span>
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<pre style="margin: 0;">+<span id="LC2159" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ToDo.</span></span>
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2160
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<pre style="margin: 0;"> <span id="LC2160" class="line" lang="haskell"></span>
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2153
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2161
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<pre style="margin: 0;"> <span id="LC2161" class="line" lang="haskell"> <span class="n" style="color: #333;">go_cvs</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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2154
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2162
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<pre style="margin: 0;"> <span id="LC2162" class="line" lang="haskell"> <span class="n" style="color: #333;">go_cvs</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;">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;">cvs</span></span>
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<li id="89a2e0e1a3095c7a42b10f2819049908908080e8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/c5deeadeb1f90b47beab9d91dcb5095b22581efd...d35f1fefd24846dee79a6572c6b957309814d3fd#89a2e0e1a3095c7a42b10f2819049908908080e8"><strong>compiler/GHC/Core/Unify.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">@@ -1278,7 +1278,7 @@ and voila! In summary:</td>
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1278
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<pre style="margin: 0;"> <span id="LC1278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> described here is applicable on a monad-by-monad basis under</span></span>
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1279
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1279
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<pre style="margin: 0;"> <span id="LC1279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> programmer control.</span></span>
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<pre style="margin: 0;"> <span id="LC1280" class="line" lang="haskell"></span>
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1281
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<pre style="margin: 0;">-<span id="LC1281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Beware: it<span class="idiff left right">t</span> changes the behaviour of</span></span>
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1281
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<pre style="margin: 0;">+<span id="LC1281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Beware: it changes the behaviour of</span></span>
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1282
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<pre style="margin: 0;"> <span id="LC1282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> map (foo 3) xs</span></span>
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<pre style="margin: 0;"> <span id="LC1283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ToDo: explain what to do if you want to do this</span></span>
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<pre style="margin: 0;"> <span id="LC1284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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