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Marge Bot pushed to branch master
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/9334467f5dd59f9ea7c231c5ff0b1987df4d1570">9334467f</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2019-05-28T04:24:50Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve comments around injectivity checks
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<h4>3 changed files:</h4>
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<a href="#b402d55a665933a2d571616f57dd6bd465d29ae6">
compiler/typecheck/FamInst.hs
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<a href="#39976578d614a500311fd7c538d70e9e4244a564">
compiler/typecheck/TcValidity.hs
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<a href="#650f968dabaaf0f93c1caa167d85c981c45e3fc1">
compiler/types/FamInstEnv.hs
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<h4>Changes:</h4>
<li id="b402d55a665933a2d571616f57dd6bd465d29ae6">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/9334467f5dd59f9ea7c231c5ff0b1987df4d1570#b402d55a665933a2d571616f57dd6bd465d29ae6"><strong>compiler/typecheck/FamInst.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">@@ -768,14 +768,14 @@ makeInjectivityErrors fi_ax axiom inj conflicts</td>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- declaration. The returned Pair includes invisible vars followed by visible ones</span></span>
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769
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"><span class="n" style="color: #333;">unusedInjTvsInRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarSet</span></span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- INVARIANT: [Bool] list contains at least one True value</span></span>
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<pre style="margin: 0;">-<span id="LC771" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Verifying injectivity annotation]<span class="idiff left right">. This function implements fourth</span></span></span>
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<pre style="margin: 0;">-<span id="LC772" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">check</span> described there.</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Verifying injectivity annotation]<span class="idiff left right"> in FamInstEnv.</span></span></span>
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">This function implements check (4)</span> described there.</span></span>
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<pre style="margin: 0;"> <span id="LC773" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In theory, instead of implementing this whole check in this way, we could</span></span>
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<pre style="margin: 0;"> <span id="LC774" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- attempt to unify equation with itself. We would reject exactly the same</span></span>
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<pre style="margin: 0;"> <span id="LC775" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equations but this method gives us more precise error messages by returning</span></span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- precise names of variables that are not mentioned in the RHS.</span></span>
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="haskell"><span class="n" style="color: #333;">unusedInjTvsInRHS</span> <span class="n" style="color: #333;">tycon</span> <span class="n" style="color: #333;">injList</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC778" class="line" lang="haskell"> <span class="p">(`</span><span class="n" style="color: #333;">minusVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">injRhsVars</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">injL<span class="idiff left right">HS</span>Vars</span></span>
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"> <span class="p">(`</span><span class="n" style="color: #333;">minusVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">injRhsVars</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">injL<span class="idiff left right">hs</span>Vars</span></span>
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"> <span class="n" style="color: #333;">inj_pairs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span><span class="p">)]</span></span>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- All the injective arguments, paired with their visibility</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">@@ -789,7 +789,7 @@ unusedInjTvsInRHS tycon injList lhs rhs =</td>
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC790" class="line" lang="haskell"> <span class="n" style="color: #333;">invis_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">invis_lhs</span></span>
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<pre style="margin: 0;"> <span id="LC791" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">invis_vars'</span> <span class="n" style="color: #333;">vis_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitVisVarsOfTypes</span> <span class="n" style="color: #333;">vis_lhs</span></span>
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<pre style="margin: 0;">-<span id="LC792" class="line" lang="haskell"> <span class="n" style="color: #333;">injL<span class="idiff left right">HS</span>Vars</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"> <span class="n" style="color: #333;">injL<span class="idiff left right">hs</span>Vars</span></span>
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="p">(</span><span class="n" style="color: #333;">invis_vars</span> <span class="p">`</span><span class="n" style="color: #333;">minusVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">vis_vars</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">invis_vars'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC794" class="line" lang="haskell"> <span class="n" style="color: #333;">vis_vars</span></span>
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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"></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">@@ -813,7 +813,7 @@ injTyVarsOfType (TyVarTy v)</td>
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<pre style="margin: 0;"> <span id="LC813" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitVarSet</span> <span class="n" style="color: #333;">v</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">injTyVarsOfType</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"><span class="n" style="color: #333;">injTyVarsOfType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC815" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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<pre style="margin: 0;">-<span id="LC816" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tyConInjectivityInfo</span> <span class="n" style="color: #333;">tc</span> <span class="kr" style="font-weight: 600;">of</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="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tyConInjectivityInfo</span> <span class="n" style="color: #333;">tc</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC817" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NotInjective</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Injective</span> <span class="n" style="color: #333;">inj</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">injTyVarsOfTypes</span> <span class="p">(</span><span class="n" style="color: #333;">filterByList</span> <span class="n" style="color: #333;">inj</span> <span class="n" style="color: #333;">tys</span><span class="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="n" style="color: #333;">otherwise</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">@@ -835,8 +835,7 @@ injTyVarsOfTypes tys = mapUnionVarSet injTyVarsOfType tys</td>
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"><span class="cd">-- | Is type headed by a type family application?</span></span>
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<pre style="margin: 0;"> <span id="LC837" class="line" lang="haskell"><span class="n" style="color: #333;">isTFHeaded</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC838" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Verifying injectivity annotation]. This function implements third</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;">-- check described there.</span></span>
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Verifying injectivity annotation], case 3.</span></span>
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"><span class="n" style="color: #333;">isTFHeaded</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreView</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTFHeaded</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"><span class="n" style="color: #333;">isTFHeaded</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ty</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">@@ -848,8 +847,7 @@ isTFHeaded _ = False</td>
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"><span class="cd">-- | If a RHS is a bare type variable return a set of LHS patterns that are not</span></span>
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- bare type variables.</span></span>
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"><span class="n" style="color: #333;">bareTvInRHSViolated</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span></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;">-- See Note [Verifying injectivity annotation]. This function implements second</span></span>
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<pre style="margin: 0;">-<span id="LC852" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- check described there.</span></span>
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Verifying injectivity annotation], case 2.</span></span>
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"><span class="n" style="color: #333;">bareTvInRHSViolated</span> <span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVarTy</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isTyVarTy</span><span class="p">)</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"><span class="n" style="color: #333;">bareTvInRHSViolated</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9334467f5dd59f9ea7c231c5ff0b1987df4d1570#39976578d614a500311fd7c538d70e9e4244a564"><strong>compiler/typecheck/TcValidity.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">@@ -2031,6 +2031,7 @@ checkValidCoAxiom ax@(CoAxiom { co_ax_tc = fam_tc, co_ax_branches = branches })</td>
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<pre style="margin: 0;"> <span id="LC2031" class="line" lang="haskell"> <span class="n" style="color: #333;">gather_conflicts</span> <span class="n" style="color: #333;">inj</span> <span class="n" style="color: #333;">prev_branches</span> <span class="n" style="color: #333;">cur_branch</span> <span class="p">(</span><span class="n" style="color: #333;">acc</span><span class="p">,</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="n" style="color: #333;">branch</span></span>
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<pre style="margin: 0;"> <span id="LC2032" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- n is 0-based index of branch in prev_branches</span></span>
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<pre style="margin: 0;"> <span id="LC2033" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">injectiveBranches</span> <span class="n" style="color: #333;">inj</span> <span class="n" style="color: #333;">cur_branch</span> <span class="n" style="color: #333;">branch</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC2034" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Case 1B2 in Note [Verifying injectivity annotation] in FamInstEnv</span></span>
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<pre style="margin: 0;"> <span id="LC2035" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InjectivityUnified</span> <span class="n" style="color: #333;">ax1</span> <span class="n" style="color: #333;">ax2</span></span>
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<pre style="margin: 0;"> <span id="LC2036" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ax1</span> <span class="p">`</span><span class="n" style="color: #333;">isDominatedBy</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">replace_br</span> <span class="n" style="color: #333;">prev_branches</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ax2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2037" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">acc</span><span class="p">,</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</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">@@ -534,12 +534,12 @@ injectiveBranches :: [Bool] -> CoAxBranch -> CoAxBranch</td>
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="haskell"><span class="n" style="color: #333;">injectiveBranches</span> <span class="n" style="color: #333;">injectivity</span></span>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="haskell"> <span class="n" style="color: #333;">ax1</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs1</span><span class="p">,</span> <span class="n" style="color: #333;">cab_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs1</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"> <span class="n" style="color: #333;">ax2</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs2</span><span class="p">,</span> <span class="n" style="color: #333;">cab_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs2</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Verifying injectivity annotation]. This function implements first</span></span>
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<pre style="margin: 0;">-<span id="LC538" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- check described there.</span></span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Verifying injectivity annotation], case 1.</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;">let</span> <span class="n" style="color: #333;">getInjArgs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterByList</span> <span class="n" style="color: #333;">injectivity</span></span>
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcUnifyTyWithTFs</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">rhs1</span> <span class="n" style="color: #333;">rhs2</span> <span class="kr" style="font-weight: 600;">of</span> <span class="c1" style="color: #998; font-style: italic;">-- True = two-way pre-unification</span></span>
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<pre style="margin: 0;">-<span id="LC541" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InjectivityAccepted</span> <span class="c1" style="color: #998; font-style: italic;">-- RHS are different, so equations are</span></span>
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<pre style="margin: 0;">-<span id="LC542" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- injective.</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InjectivityAccepted</span></span>
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- RHS are different, so equations are injective.</span></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is case 1A from Note [Verifying injectivity annotation]</span></span>
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">-></span> <span class="c1" style="color: #998; font-style: italic;">-- RHS unify under a substitution</span></span>
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lhs1Subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substTys</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">getInjArgs</span> <span class="n" style="color: #333;">lhs1</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs2Subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substTys</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">getInjArgs</span> <span class="n" style="color: #333;">lhs2</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">@@ -548,12 +548,14 @@ injectiveBranches injectivity</td>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equal under that substitution then this pair of equations violates</span></span>
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<pre style="margin: 0;"> <span id="LC549" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- injectivity annotation, but for closed type families it still might</span></span>
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- be the case that one LHS after substitution is unreachable.</span></span>
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<pre style="margin: 0;">-<span id="LC551" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">eqTypes</span> <span class="n" style="color: #333;">lhs1Subst</span> <span class="n" style="color: #333;">lhs2Subst</span></span>
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<pre style="margin: 0;">+<span id="LC551" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">eqTypes</span> <span class="n" style="color: #333;">lhs1Subst</span> <span class="n" style="color: #333;">lhs2Subst</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- check case 1B1 from Note.</span></span></span>
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">InjectivityAccepted</span></span>
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<pre style="margin: 0;"> <span id="LC553" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">InjectivityUnified</span> <span class="p">(</span> <span class="n" style="color: #333;">ax1</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substTys</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">lhs1</span></span>
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<pre style="margin: 0;"> <span id="LC554" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rhs1</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC555" class="line" lang="haskell"> <span class="p">(</span> <span class="n" style="color: #333;">ax2</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substTys</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">lhs2</span></span>
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rhs2</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC557" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- payload of InjectivityUnified used only for check 1B2, only</span></span>
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for closed type families</span></span>
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<pre style="margin: 0;"> <span id="LC559" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC560" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- takes a CoAxiom with unknown branch incompatibilities and computes</span></span>
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the compatibilities</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">@@ -826,7 +828,7 @@ conditions hold:</td>
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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. For each pair of *different* equations of a type family, one of the following</span></span>
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> conditions holds:</span></span>
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A: RHSs are different.</span></span>
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A: RHSs are different.<span class="idiff left right"> (Check done in FamInstEnv.injectiveBranches)</span></span></span>
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> B1: OPEN TYPE FAMILIES: If the RHSs can be unified under some substitution</span></span>
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then it must be possible to unify the LHSs under the same substitution.</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">@@ -838,7 +840,7 @@ conditions hold:</td>
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RHSs of these two equations unify under [ a |-> Int ] substitution.</span></span>
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Under this substitution LHSs are equal therefore these equations don't</span></span>
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<pre style="margin: 0;">-<span id="LC841" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> violate injectivity annotation.</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;"> violate injectivity annotation.<span class="idiff left right"> (Check done in FamInstEnv.injectiveBranches)</span></span></span>
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"></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;"> B2: CLOSED TYPE FAMILIES: If the RHSs can be unified under some</span></span>
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846
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<pre style="margin: 0;"> <span id="LC846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> substitution then either the LHSs unify under the same substitution or</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">@@ -855,7 +857,7 @@ conditions hold:</td>
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of last equation and check whether it is overlapped by any of previous</span></span>
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856
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> equations. Since it is overlapped by the first equation we conclude</span></span>
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that pair of last two equations does not violate injectivity</span></span>
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<pre style="margin: 0;">-<span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> annotation.</span></span>
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> annotation.<span class="idiff left right"> (Check done in TcValidity.checkValidCoAxiom#gather_conflicts)</span></span></span>
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859
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A special case of B is when RHSs unify with an empty substitution ie. they</span></span>
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863
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> are identical.</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">@@ -869,7 +871,7 @@ conditions hold:</td>
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871
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note that we only take into account these LHS patterns that were declared</span></span>
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870
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872
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> as injective.</span></span>
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873
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<pre style="margin: 0;"> <span id="LC873" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. If a RHS of a type family equation is a bare type variable then</span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. If a<span class="idiff left right">n</span> RHS of a type family equation is a bare type variable then</span></span>
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875
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> all LHS variables (including implicit kind variables) also have to be bare.</span></span>
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874
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876
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In other words, this has to be a sole equation of that type family and it has</span></span>
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<pre style="margin: 0;"> <span id="LC877" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to cover all possible patterns. So for example this definition will be</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">@@ -880,15 +882,16 @@ conditions hold:</td>
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882
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"></span>
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883
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<pre style="margin: 0;"> <span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If it were accepted we could call `W1 [W1 Int]`, which would reduce to</span></span>
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884
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<pre style="margin: 0;"> <span id="LC884" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `W1 Int` and then by injectivity we could conclude that `[W1 Int] ~ Int`,</span></span>
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883
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<pre style="margin: 0;">-<span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> which is bogus.</span></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> which is bogus.<span class="idiff left right"> Checked FamInst.bareTvInRHSViolated.</span></span></span>
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884
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886
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<pre style="margin: 0;"> <span id="LC886" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. If <span class="idiff left right">a</span> RHS of a type family equation is a type family application then the type</span></span>
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886
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<pre style="margin: 0;">-<span id="LC886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> family is rejected as not injective.</span></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. If <span class="idiff left right">the</span> RHS of a type family equation is a type family application then the type</span></span>
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> family is rejected as not injective.<span class="idiff left right"> This is checked by FamInst.isTFHeaded.</span></span></span>
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887
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889
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<pre style="margin: 0;"> <span id="LC889" class="line" lang="haskell"></span>
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890
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<pre style="margin: 0;"> <span id="LC890" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">4. If a LHS type variable that is declared as injective is not mentioned on</span></span>
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891
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<pre style="margin: 0;"> <span id="LC891" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> injective position in the RHS then the type family is rejected as not</span></span>
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<pre style="margin: 0;"> <span id="LC892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> injective. "Injective position" means either an argument to a type</span></span>
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893
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<pre style="margin: 0;"> <span id="LC893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constructor or argument to a type family on injective position.</span></span>
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894
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is checked by FamInst.unusedInjTvsInRHS.</span></span>
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892
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895
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<pre style="margin: 0;"> <span id="LC895" class="line" lang="haskell"></span>
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893
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896
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<pre style="margin: 0;"> <span id="LC896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Injective type families] in TyCon</span></span>
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897
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<pre style="margin: 0;"> <span id="LC897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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