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<h3>
Marge Bot pushed to branch master
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/c409961aea59d2fe2ae71036a1ae6d94c4ee05c8">c409961a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-22T23:16:12-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update commentary and slightly refactor GHC.Tc.Deriv.Infer
There was some out-of-date commentary in `GHC.Tc.Deriv.Infer` that
has been modernized. Along the way, I removed the `bad` constraints
in `simplifyDeriv`, which did not serve any useful purpose (besides
being printed in debugging output).
Fixes #18073.
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<h4>1 changed file:</h4>
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<a href="#1e112461bfd65ab9492f37fe37931c1d5ddc5c26">
compiler/GHC/Tc/Deriv/Infer.hs
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<h4>Changes:</h4>
<li id="1e112461bfd65ab9492f37fe37931c1d5ddc5c26">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c409961aea59d2fe2ae71036a1ae6d94c4ee05c8#1e112461bfd65ab9492f37fe37931c1d5ddc5c26"><strong>compiler/GHC/Tc/Deriv/Infer.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">@@ -803,28 +803,31 @@ simplifyDeriv pred tvs thetas</td>
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<pre style="margin: 0;"> <span id="LC803" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">solved_wanteds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkWC</span> <span class="n" style="color: #333;">solved_wanteds</span></span>
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See [STEP DAC HOIST]</span></span>
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<pre style="margin: 0;">-<span id="LC806" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Split the resulting constraints into bad and good constraints,</span></span>
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807
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<pre style="margin: 0;">-<span id="LC807" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- building an @unsolved :: WantedConstraints@ representing all</span></span>
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<pre style="margin: 0;">-<span id="LC808" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the constraints we can't just shunt to the predicates.</span></span>
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Exotic derived instance contexts]</span></span>
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- From the simplified constraints extract a subset 'good' that will</span></span>
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<pre style="margin: 0;">+<span id="LC807" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- become the context 'min_theta' for the derived instance.</span></span>
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">residual_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">approximateWC</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">solved_wanteds</span></span>
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<pre style="margin: 0;">-<span id="LC811" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bad</span><span class="p">,</span> <span class="n" style="color: #333;">good</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionBagWith</span> <span class="n" style="color: #333;">get_good</span> <span class="n" style="color: #333;">residual_simple</span></span>
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<pre style="margin: 0;">-<span id="LC812" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC813" class="line" lang="haskell"> <span class="n" style="color: #333;">get_good</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span></span>
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"> <span class="n" style="color: #333;">good</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybeBag</span> <span class="n" style="color: #333;">get_good</span> <span class="n" style="color: #333;">residual_simple</span></span>
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC811" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Returns @Just p@ (where @p@ is the type of the Ct) if a Ct is</span></span>
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<pre style="margin: 0;">+<span id="LC812" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- suitable to be inferred in the context of a derived instance.</span></span>
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<pre style="margin: 0;">+<span id="LC813" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Returns @Nothing@ if the Ct is too exotic.</span></span>
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<pre style="margin: 0;">+<span id="LC814" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Exotic derived instance contexts] for what</span></span>
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<pre style="margin: 0;">+<span id="LC815" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constitutes an exotic constraint.</span></span>
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<pre style="margin: 0;">+<span id="LC816" class="line" lang="haskell"> <span class="n" style="color: #333;">get_good</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</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;">PredType</span></span>
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<pre style="margin: 0;"> <span id="LC817" class="line" lang="haskell"> <span class="n" style="color: #333;">get_good</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">validDerivPred</span> <span class="n" style="color: #333;">skol_set</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isWantedCt</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC816" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Righ</span>t</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC819" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Jus</span>t</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC820" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: This is wrong</span></span>
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<pre style="margin: 0;"> <span id="LC821" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB re 'isWantedCt': residual_wanted may contain</span></span>
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<pre style="margin: 0;"> <span id="LC822" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unsolved CtDerived and we stick them into the</span></span>
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<pre style="margin: 0;"> <span id="LC823" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bad set so that reportUnsolved may decide what</span></span>
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<pre style="margin: 0;"> <span id="LC824" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to do with them</span></span>
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<pre style="margin: 0;"> <span id="LC825" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC823" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Left</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ct</span></span></span>
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nothing</span></span></span>
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span></span>
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828
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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"></span>
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829
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"simplifyDeriv outputs"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC827" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tvs_skols</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">residual_simple</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">good</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bad</span></span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tvs_skols</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">residual_simple</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">good</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Return the good unsolved constraints (unskolemizing on the way out.)</span></span>
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833
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">min_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkMinimalBySCs</span> <span class="n" style="color: #333;">id</span> <span class="p">(</span><span class="n" style="color: #333;">bagToList</span> <span class="n" style="color: #333;">good</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -838,6 +841,10 @@ simplifyDeriv pred tvs thetas</td>
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The reverse substitution (sigh)</span></span>
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842
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"></span>
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See [STEP DAC RESIDUAL]</span></span>
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844
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Ensure that min_theta is enough to solve /all/ the constraints in</span></span>
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845
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<pre style="margin: 0;">+<span id="LC845" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- solved_wanteds, by solving the implication constraint</span></span>
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<pre style="margin: 0;">+<span id="LC846" 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="LC847" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- forall tvs. min_theta => solved_wanteds</span></span>
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848
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">min_theta_vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">newEvVar</span> <span class="n" style="color: #333;">min_theta</span></span>
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849
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">leftover_implic</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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843
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850
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<pre style="margin: 0;"> <span id="LC850" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">buildImplicationFor</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">tvs_skols</span></span>
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