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<h3>
Richard Eisenberg pushed to branch wip/T16762
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a777a490038b2c6db8cdaa17ec4af18db5dc619">7a777a49</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-10-09T13:21:06-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Still freshen existentials, though.
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<h4>2 changed files:</h4>
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<a href="#3ee8be814b6c6727880deab3772e6af922524bf0">
compiler/GHC/Tc/Gen/Pat.hs
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<a href="#59d42d45d27a766c3ef299d73c226697153b7f6e">
compiler/GHC/Tc/Utils/Instantiate.hs
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<h4>Changes:</h4>
<li id="3ee8be814b6c6727880deab3772e6af922524bf0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a777a490038b2c6db8cdaa17ec4af18db5dc619#3ee8be814b6c6727880deab3772e6af922524bf0"><strong>compiler/GHC/Tc/Gen/Pat.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">@@ -837,6 +837,15 @@ between alternatives.</td>
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837
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837
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<pre style="margin: 0;"> <span id="LC837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">RIP GADT refinement: refinements have been replaced by the use of explicit</span></span>
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838
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838
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equality constraints that are used in conjunction with implication constraints</span></span>
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839
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839
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to express the local scope of GADT refinements.</span></span>
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840
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"></span>
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841
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<pre style="margin: 0;">+<span id="LC841" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Freshen existentials]</span></span>
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842
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<pre style="margin: 0;">+<span id="LC842" 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="LC843" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It is essential that these existentials are freshened.</span></span>
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Otherwise, if we have something like</span></span>
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<pre style="margin: 0;">+<span id="LC845" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case (a :: Ex, b :: Ex) of (MkEx ..., MkEx ...) -> ...</span></span>
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we'll give both unpacked existential variables the</span></span>
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">same name, leading to shadowing.</span></span>
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<pre style="margin: 0;">+<span id="LC848" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC849" 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="LC850" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Running example:</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">@@ -887,6 +896,7 @@ tcDataConPat penv (L con_span con_name) data_con pat_ty_scaled</td>
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887
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<pre style="margin: 0;"> <span id="LC896" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC897" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tenv</span><span class="p">,</span> <span class="n" style="color: #333;">ex_tvs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="n" style="color: #333;">tenv</span> <span class="n" style="color: #333;">ex_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC898" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Get location from monad, not from ex_tvs</span></span>
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This freshens: See Note [Freshen existentials]</span></span>
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<pre style="margin: 0;"> <span id="LC900" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC901" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="c1" style="color: #998; font-style: italic;">-- pat_ty' = mkTyConApp tycon ctxt_res_tys</span></span>
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892
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902
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<pre style="margin: 0;"> <span id="LC902" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pat_ty' is type of the actual constructor application</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">@@ -973,6 +983,8 @@ tcPatSynPat penv (L con_span _) pat_syn pat_ty arg_pats thing_inside</td>
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973
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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">prov_theta</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">)</span></span>
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974
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984
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<pre style="margin: 0;"> <span id="LC984" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkExistentials</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">all_arg_tys</span> <span class="n" style="color: #333;">penv</span></span>
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975
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985
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<pre style="margin: 0;"> <span id="LC985" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tenv</span><span class="p">,</span> <span class="n" style="color: #333;">ex_tvs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ex_tvs</span></span>
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986
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<pre style="margin: 0;">+<span id="LC986" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This freshens: Note [Freshen existentials]</span></span>
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987
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<pre style="margin: 0;">+<span id="LC987" class="line" lang="haskell"></span>
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988
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<pre style="margin: 0;"> <span id="LC988" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">tenv</span> <span class="n" style="color: #333;">ty</span></span>
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977
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989
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<pre style="margin: 0;"> <span id="LC989" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_tys'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substScaledTys</span> <span class="n" style="color: #333;">tenv</span> <span class="n" style="color: #333;">arg_tys</span></span>
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978
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990
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<pre style="margin: 0;"> <span id="LC990" class="line" lang="haskell"> <span class="n" style="color: #333;">pat_mult</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">scaledMult</span> <span class="n" style="color: #333;">pat_ty</span></span>
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<li id="59d42d45d27a766c3ef299d73c226697153b7f6e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a777a490038b2c6db8cdaa17ec4af18db5dc619#59d42d45d27a766c3ef299d73c226697153b7f6e"><strong>compiler/GHC/Tc/Utils/Instantiate.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">@@ -486,7 +486,7 @@ tcInstTypeBndrs id</td>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolDFunType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DFunId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC488" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Instantiate a type signature with skolem constants.</span></span>
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<pre style="margin: 0;">-<span id="LC489" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">We could give them fresh</span> names, but no need to do so</span></span>
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">This freshens the</span> names, but no need to do so</span></span>
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490
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolDFunType</span> <span class="n" style="color: #333;">dfun</span></span>
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491
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<pre style="margin: 0;"> <span id="LC491" 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="p">(</span><span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstType</span> <span class="n" style="color: #333;">tcInstSuperSkolTyVars</span> <span class="n" style="color: #333;">dfun</span></span>
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</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">@@ -518,20 +518,34 @@ tcInstSkolTyVarsX = tcInstSkolTyVarsPushLevel False</td>
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518
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This version freshens the names and creates "super skolems";</span></span>
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- see comments around superSkolemTv.</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>
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<pre style="margin: 0;"> <span id="LC524" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This version freshens the names and creates "super skolems";</span></span>
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- see comments around superSkolemTv.</span></span>
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;"> <span id="LC530" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC527" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <=> make "super skolem" AND</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- freshen names</span></span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Skolemise one level deeper, hence pushTcLevel</span></span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>
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<pre style="margin: 0;">-<span id="LC531" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="n" style="color: #333;">overlappable</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="n" style="color: #333;">overlappable<span class="idiff left right">_and_freshen</span></span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;"> <span id="LC538" 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;">tc_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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533
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539
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pushed_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pushTcLevel</span> <span class="n" style="color: #333;">tc_lvl</span></span>
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534
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<pre style="margin: 0;">-<span id="LC534" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">tcInstSkolTyVarsAt</span> <span class="n" style="color: #333;">pushed_lvl</span> <span class="n" style="color: #333;">overlappable</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">overlappable_and_freshen</span></span>
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541
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">freshenTyCoVarsX</span> <span class="p">(</span><span class="n" style="color: #333;">mk_skol</span> <span class="n" style="color: #333;">pushed_lvl</span><span class="p">)</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span></span>
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542
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">tcInstSkolTyVarsAt</span> <span class="n" style="color: #333;">pushed_lvl</span> <span class="n" style="color: #333;">overlappable_and_freshen</span></span>
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543
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC545" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_skol</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span></span>
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<pre style="margin: 0;">+<span id="LC546" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_skol</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">nm</span> <span class="n" style="color: #333;">ki</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyVar</span> <span class="n" style="color: #333;">nm</span> <span class="n" style="color: #333;">ki</span> <span class="n" style="color: #333;">details</span></span>
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<pre style="margin: 0;">+<span id="LC547" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="haskell"> <span class="n" style="color: #333;">details</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">overlappable_and_freshen</span></span>
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<pre style="margin: 0;"> <span id="LC549" class="line" lang="haskell"></span>
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550
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsAt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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