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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/f235a943a074d00978dc2e98ccba6b80fc580147">f235a943</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-12T17:29:20-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revisit [Prevent unification with type families]
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d26bf41f46bbbe9f1479fdb970d171f2f867326">7d26bf41</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-13T11:15:53-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't flatten during instance lookup
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<h4>3 changed files:</h4>
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<li class="file-stats">
<a href="#5596bb0f228bd2a308c4391df97375ae879430a8">
compiler/GHC/Core/InstEnv.hs
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<li class="file-stats">
<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<h4>Changes:</h4>
<li id="5596bb0f228bd2a308c4391df97375ae879430a8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/0b4d386cc779db18e9fdb266cf76bff341fb126a...7d26bf41f46bbbe9f1479fdb970d171f2f867326#5596bb0f228bd2a308c4391df97375ae879430a8"><strong>compiler/GHC/Core/InstEnv.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">@@ -41,7 +41,6 @@ import GHC.Unit.Types</td>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Class</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>
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<pre style="margin: 0;">-<span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Set</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">getUnique</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">@@ -836,13 +835,10 @@ lookupInstEnv' ie vis_mods cls tys</td>
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Unification will break badly if the variables overlap</span></span>
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- They shouldn't because we allocate separate uniques for them</span></span>
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<pre style="margin: 0;"> <span id="LC837" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Template tyvars are fresh]</span></span>
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<pre style="margin: 0;">-<span id="LC839" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">tpl_tv_set</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tys_tv_set</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC840" class="line" lang="haskell"> <span class="n" style="color: #333;">flattened_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flattenTys</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">tys</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">-<span id="LC841" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: important to flatten here. Otherwise, it looks like</span></span>
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<pre style="margin: 0;">-<span id="LC842" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- instance C Int cannot match a target [W] C (F Bool).</span></span>
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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 Note [Flattening type-family applications when matching instances]</span></span>
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<pre style="margin: 0;">-<span id="LC844" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Core.Unify.</span></span>
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<pre style="margin: 0;">-<span id="LC845" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcUnifyTysFG</span> <span class="n" style="color: #333;">instanceBindFun</span> <span class="n" style="color: #333;">tpl_tys</span> <span class="n" style="color: #333;">flattened_tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcUnifyTysFG</span> <span class="n" style="color: #333;">instanceBindFun</span> <span class="n" style="color: #333;">tpl_tys</span> <span class="n" style="color: #333;">tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We consider MaybeApart to be a case where the instance might</span></span>
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- apply in the future. This covers an instance like C Int and</span></span>
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<pre style="margin: 0;">+<span id="LC841" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a target like [W] C (F a), where F is a type family.</span></span>
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842
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">find</span> <span class="n" style="color: #333;">ms</span> <span class="n" style="color: #333;">us</span> <span class="n" style="color: #333;">rest</span></span>
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">find</span> <span class="n" style="color: #333;">ms</span> <span class="p">(</span><span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">us</span><span class="p">)</span> <span class="n" style="color: #333;">rest</span></span>
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/0b4d386cc779db18e9fdb266cf76bff341fb126a...7d26bf41f46bbbe9f1479fdb970d171f2f867326#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">@@ -1015,7 +1015,8 @@ can_eq_nc' _flat _rdr_env _envs ev eq_rel ty1 _ ty2 _</td>
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1015
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1015
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<pre style="margin: 0;"> <span id="LC1015" 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;">tc1</span><span class="p">,</span> <span class="n" style="color: #333;">tys1</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;">ty1</span></span>
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1016
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc2</span><span class="p">,</span> <span class="n" style="color: #333;">tys2</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;">ty2</span></span>
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1017
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we want to catch e.g. Maybe Int ~ (Int -> Int) here for better</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- error messages; hence no direct match on TyConApp</span></span>
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- error messages rather than decomposing into AppTys;</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hence no direct match on TyConApp</span></span>
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1019
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc1</span><span class="p">)</span></span>
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1020
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc2</span><span class="p">)</span></span>
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1021
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1022
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canTyConApp</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">tys1</span> <span class="n" style="color: #333;">tc2</span> <span class="n" style="color: #333;">tys2</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/0b4d386cc779db18e9fdb266cf76bff341fb126a...7d26bf41f46bbbe9f1479fdb970d171f2f867326#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/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">@@ -1434,7 +1434,7 @@ uUnfilledVar2 origin t_or_k swapped tv1 ty2</td>
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<pre style="margin: 0;"> <span id="LC1434" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1435
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1435
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<pre style="margin: 0;"> <span id="LC1435" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">cur_lvl</span></span>
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1436
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1436
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<pre style="margin: 0;"> <span id="LC1436" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">canSolveByUnification</span> <span class="n" style="color: #333;">cur_lvl</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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1437
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<pre style="margin: 0;">-<span id="LC1437" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Prevent unification with type families] about the <span class="idiff left right">False</span>:</span></span>
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<pre style="margin: 0;">+<span id="LC1437" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Prevent unification with type families] about the <span class="idiff left right">NoTypeFamilies</span>:</span></span>
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<pre style="margin: 0;"> <span id="LC1438" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="n" style="color: #333;">ty2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">metaTyVarUpdateOK</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">NoTypeFamilies</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC1439" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">co_k</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">uType</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="n" style="color: #333;">kind_origin</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty2'</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1440" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"uUnfilledVar2 ok"</span> <span class="o" style="font-weight: 600;">$</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">@@ -1677,6 +1677,9 @@ It would be lovely in the future to revisit this problem and remove this</td>
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<pre style="margin: 0;"> <span id="LC1677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">extra, unnecessary check. But we retain it for now as it seems to work</span></span>
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<pre style="margin: 0;"> <span id="LC1678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">better in practice.</span></span>
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<pre style="margin: 0;"> <span id="LC1679" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Revisited in Nov '20, along with removing flattening variables. Problem</span></span>
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<pre style="margin: 0;">+<span id="LC1681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is still present, and the solution (NoTypeFamilies) is still the same.</span></span>
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<pre style="margin: 0;">+<span id="LC1682" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Refactoring hazard: metaTyVarUpdateOK]</span></span>
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<pre style="margin: 0;"> <span id="LC1684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC1685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">I (Richard E.) have a sad story about refactoring this code, retained here</span></span>
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