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<h3>
Richard Eisenberg pushed to branch wip/cfuneqcan-refactor
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/f2bbcc402adb211c78cf185e0cda194e6f8d87b1">f2bbcc40</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-17T10:46:37-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments, etc., from Friday
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<h4>4 changed files:</h4>
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<a href="#89a2e0e1a3095c7a42b10f2819049908908080e8">
compiler/GHC/Core/Unify.hs
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<h4>Changes:</h4>
<li id="89a2e0e1a3095c7a42b10f2819049908908080e8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f2bbcc402adb211c78cf185e0cda194e6f8d87b1#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">@@ -1244,6 +1244,7 @@ data BindFlag</td>
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<pre style="margin: 0;"> <span id="LC1244" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1245" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Skolem</span> <span class="c1" style="color: #998; font-style: italic;">-- This type variable is a skolem constant</span></span>
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<pre style="margin: 0;"> <span id="LC1246" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't bind it; it only matches itself</span></span>
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<pre style="margin: 0;">+<span id="LC1247" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These variables are SurelyApart from other types</span></span>
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<pre style="margin: 0;"> <span id="LC1248" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>
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<pre style="margin: 0;"> <span id="LC1249" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1250" 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/f2bbcc402adb211c78cf185e0cda194e6f8d87b1#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.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">@@ -2520,26 +2520,27 @@ Wrinkles:</td>
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<pre style="margin: 0;"> <span id="LC2520" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> must be sure to kick out any such CIrredCan constraints that mention coercion holes</span></span>
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<pre style="margin: 0;"> <span id="LC2521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when those holes get filled in, so that the unification step can now proceed.</span></span>
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<pre style="margin: 0;"> <span id="LC2522" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (2a) We must now absolutely make sure to kick out any constraints that</span></span>
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<pre style="margin: 0;">-<span id="LC2524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mention a newly-filled-in coercion hole -- if there are no more</span></span>
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<pre style="margin: 0;">-<span id="LC2525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> remaining coercion holes. This is done in</span></span>
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<pre style="margin: 0;">-<span id="LC2526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kickOutAfterFillingCoercionHole. The extra check that there are no</span></span>
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<pre style="margin: 0;">-<span id="LC2527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> more remaining holes avoids needless work when rewriting evidence</span></span>
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<pre style="margin: 0;">-<span id="LC2528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (which fills coercion holes) and aids efficiency. It also can avoid</span></span>
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<pre style="margin: 0;">-<span id="LC2529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a loop in the solver that would otherwise arise in this case:</span></span>
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<pre style="margin: 0;">+<span id="LC2523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (2a) We must now kick out any constraints that mention a newly-filled-in</span></span>
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<pre style="margin: 0;">+<span id="LC2524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> coercion hole, but only if there are no more remaining coercion</span></span>
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2525
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<pre style="margin: 0;">+<span id="LC2525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> holes. This is done in kickOutAfterFillingCoercionHole. The extra</span></span>
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2526
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<pre style="margin: 0;">+<span id="LC2526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> check that there are no more remaining holes avoids needless work</span></span>
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2527
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<pre style="margin: 0;">+<span id="LC2527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when rewriting evidence (which fills coercion holes) and aids</span></span>
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2528
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<pre style="margin: 0;">+<span id="LC2528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> efficiency.</span></span>
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2529
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<pre style="margin: 0;">+<span id="LC2529" class="line" lang="haskell"></span>
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2530
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<pre style="margin: 0;">+<span id="LC2530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Moreover, kicking out when there are remaining unfilled holes can</span></span>
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2531
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<pre style="margin: 0;">+<span id="LC2531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> cause a loop in the solver in this case:</span></span>
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2530
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2532
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<pre style="margin: 0;"> <span id="LC2532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] w1 :: (ty1 :: F a) ~ (ty2 :: s)</span></span>
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2531
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2533
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<pre style="margin: 0;"> <span id="LC2533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> After canonicalisation, we discover that this equality is heterogeneous.</span></span>
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2532
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2534
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<pre style="margin: 0;"> <span id="LC2534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So we emit</span></span>
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2533
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2535
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<pre style="margin: 0;"> <span id="LC2535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] co_abc :: F a ~ s</span></span>
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2534
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2536
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<pre style="margin: 0;"> <span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and preserve the original as</span></span>
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2535
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<pre style="margin: 0;">-<span id="LC2535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] w2 :: (ty1 |> co_abc) ~ ty2</span></span>
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2536
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<pre style="margin: 0;">-<span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Then, co_abc comes becomes the work item. It gets swapped <span class="idiff left right">back</span></span></span>
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2537
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<pre style="margin: 0;">-<span id="LC2537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">and forth, as it goes through</span> canEqTyVarFunEq. We thus get</span></span>
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<pre style="margin: 0;">+<span id="LC2537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] w2 :: (ty1 |> co_abc) ~ ty2<span class="idiff left right"> (blocked on co_abc)</span></span></span>
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<pre style="margin: 0;">+<span id="LC2538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Then, co_abc comes becomes the work item. It gets swapped <span class="idiff left right">in</span></span></span>
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2539
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<pre style="margin: 0;">+<span id="LC2539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">canEqCanLHS2 and then back again in</span> canEqTyVarFunEq. We thus get</span></span>
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2538
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2540
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<pre style="margin: 0;"> <span id="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co_abc := sym co_abd, and then co_abd := sym co_abe, with</span></span>
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2539
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2541
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<pre style="margin: 0;"> <span id="LC2541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] co_abe :: F a ~ s</span></span>
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2540
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<pre style="margin: 0;">-<span id="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> right back where we started. (At this point, we're in canEqCanLHSFinish,</span></span>
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2541
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<pre style="margin: 0;">-<span id="LC2541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so we're not looping.) But all this filling in would,</span></span>
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2542
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<pre style="margin: 0;">-<span id="LC2542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> naively, cause w2 to be kicked out. Which, when it got processed,</span></span>
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<pre style="margin: 0;">+<span id="LC2542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This process has filled in co_abc. Suppose w2 were kicked out.</span></span>
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<pre style="margin: 0;">+<span id="LC2543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> When it gets processed,</span></span>
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<pre style="margin: 0;"> <span id="LC2544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> would get this whole chain going again. The solution is to</span></span>
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<pre style="margin: 0;"> <span id="LC2545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kick out a blocked constraint only when the result of filling</span></span>
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<pre style="margin: 0;"> <span id="LC2546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the blocking coercion involves no further blocking coercions.</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">@@ -1780,9 +1780,9 @@ kick_out_rewritable new_fr new_lhs</td>
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<pre style="margin: 0;"> <span id="LC1780" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1781" class="line" lang="haskell"> <span class="n" style="color: #333;">kick_out_for_completeness</span> <span class="c1" style="color: #998; font-style: italic;">-- (K3) and Note [K3: completeness of solving]</span></span>
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<pre style="margin: 0;"> <span id="LC1782" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">eq_rel</span><span class="p">,</span> <span class="n" style="color: #333;">new_lhs</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC1783" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NomEq</span><span class="p">,</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;">rhs_ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">canEqLHSType</span> <span class="n" style="color: #333;">new_lhs</span></span>
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<pre style="margin: 0;">-<span id="LC1784" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReprEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">new_tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isTyVarHead</span> <span class="n" style="color: #333;">new_tv</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC1785" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReprEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">new_tf</span> <span class="n" style="color: #333;">new_tf_args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1783" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NomEq</span><span class="p">,</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;">rhs_ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">canEqLHSType</span> <span class="n" style="color: #333;">new_lhs</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- (K3a)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1784" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReprEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">new_tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isTyVarHead</span> <span class="n" style="color: #333;">new_tv</span> <span class="n" style="color: #333;">rhs_ty</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- (K3b)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1785" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReprEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">new_tf</span> <span class="n" style="color: #333;">new_tf_args</span><span class="p">)</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- (K3b)</span></span></span>
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<pre style="margin: 0;"> <span id="LC1786" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_tc</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_tc_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1787" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcEqTyConApps</span> <span class="n" style="color: #333;">new_tf</span> <span class="n" style="color: #333;">new_tf_args</span> <span class="n" style="color: #333;">rhs_tc</span> <span class="n" style="color: #333;">rhs_tc_args</span></span>
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<pre style="margin: 0;"> <span id="LC1788" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f2bbcc402adb211c78cf185e0cda194e6f8d87b1#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.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">@@ -1176,6 +1176,12 @@ data ImplicStatus</td>
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<pre style="margin: 0;"> <span id="LC1176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [When does an implication have given equalities?] in GHC.Tc.Solver.Monad,</span></span>
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<pre style="margin: 0;"> <span id="LC1177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- which also explains why we need three options here. Also, see</span></span>
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1178
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1178
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<pre style="margin: 0;"> <span id="LC1178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Suppress redundant givens during error reporting] in GHC.Tc.Errors</span></span>
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1179
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<pre style="margin: 0;">+<span id="LC1179" 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="LC1180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Stops floating | Suppresses Givens in errors</span></span>
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1181
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<pre style="margin: 0;">+<span id="LC1181" 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="LC1182" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NoGivenEqs NO | YES</span></span>
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<pre style="margin: 0;">+<span id="LC1183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- LocalGivenEqs NO | NO</span></span>
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<pre style="margin: 0;">+<span id="LC1184" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- MaybeGivenEqs YES | NO</span></span>
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<pre style="margin: 0;"> <span id="LC1185" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HasGivenEqs</span></span>
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1180
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<pre style="margin: 0;"> <span id="LC1186" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- definitely no given equalities</span></span>
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1181
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<pre style="margin: 0;"> <span id="LC1187" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">LocalGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- might have Given equalities that affect only local skolems</span></span>
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