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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/11802fc3cb9d1a9bfe84193ed7f58508389f839c">11802fc3</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-24T15:04:23-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Kill off Note [Unification with skolems]
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<h4>3 changed files:</h4>
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compiler/GHC/Core/InstEnv.hs
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compiler/GHC/Core/Unify.hs
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compiler/GHC/Tc/Solver/Rewrite.hs
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<h4>Changes:</h4>
<li id="5596bb0f228bd2a308c4391df97375ae879430a8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/11802fc3cb9d1a9bfe84193ed7f58508389f839c#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">@@ -1044,7 +1044,9 @@ isOverlappableTyVar, and the use of Skolem in instanceBindFun, above, means</td>
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that these will be treated as fresh constants in the unification algorithm</span></span>
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<pre style="margin: 0;"> <span id="LC1045" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">during instance lookup. Without this treatment, GHC would complain, saying</span></span>
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that the choice of instance depended on the instantiation of 'a'; but of</span></span>
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<pre style="margin: 0;">-<span id="LC1047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">course it isn't *going* to be instantiated.</span></span>
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<pre style="margin: 0;">+<span id="LC1047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">course it isn't *going* to be instantiated. Note that it is necessary that</span></span>
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the unification algorithm returns SurelyApart for these super-skolems</span></span>
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for GHC to be able to commit to another instance.</span></span>
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<pre style="margin: 0;"> <span id="LC1050" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do this only for super skolems. For example we reject</span></span>
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<pre style="margin: 0;"> <span id="LC1052" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g :: forall a => [a] -> Int</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/11802fc3cb9d1a9bfe84193ed7f58508389f839c#89a2e0e1a3095c7a42b10f2819049908908080e8"><strong>compiler/GHC/Core/Unify.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -363,32 +363,6 @@ types are apart. This has practical consequences for the ability for closed</td>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type family applications to reduce. See test case</span></span>
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">indexed-types/should_compile/Overlap14.</span></span>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Unification with skolems]</span></span>
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<pre style="margin: 0;">-<span id="LC367" 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="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we discover that two types unify if and only if a skolem variable is</span></span>
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substituted, we can't properly unify the types. Perhaps surprisingly,</span></span>
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<pre style="margin: 0;">-<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we say that these types are SurelyApart. This is to allow an example</span></span>
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">like the following:</span></span>
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<pre style="margin: 0;">-<span id="LC372" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a b where</span></span>
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> meth :: a -> b -> ()</span></span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C a a where ...</span></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C a Int where</span></span>
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<pre style="margin: 0;">-<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> meth = meth -- a bit silly, but this is meant to be a small example</span></span>
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NB: No -XOverlappingInstances or overlapp(ing|able|ed) pragmas.</span></span>
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The recursive call within the definition of `meth` is actually ambiguous:</span></span>
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<pre style="margin: 0;">-<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">if the instance variable `a` becomes Int, then the first instance would</span></span>
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match. But this is silly, because if `a` were Int, then we would never</span></span>
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<pre style="margin: 0;">-<span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have ended up in the second instance in the first place.</span></span>
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<pre style="margin: 0;">-<span id="LC386" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We thus say that an unbindable variable is SurelyApart from other</span></span>
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">types. This allows us to accept the program above.</span></span>
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<pre style="margin: 0;">-<span id="LC389" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Binding when looking up instances] in GHC.Core.InstEnv.</span></span>
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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC366" 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="LC367" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC368" class="line" lang="haskell"><span class="cd">-- | Simple unification of two types; all type variables are bindable</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">@@ -1193,12 +1167,12 @@ uUnrefined env tv1' ty2 ty2' kco</td>
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1193
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1167
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<pre style="margin: 0;"> <span id="LC1167" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- How could this happen? If we're only matching and if</span></span>
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1194
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1168
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<pre style="margin: 0;"> <span id="LC1168" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we're comparing forall-bound variables.</span></span>
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1195
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1169
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<pre style="margin: 0;"> <span id="LC1169" class="line" lang="haskell"></span>
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1196
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<pre style="margin: 0;">-<span id="LC1196" 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;">surelyApart</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [Unification with skolems]</span></span></span>
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1170
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<pre style="margin: 0;">+<span id="LC1170" 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;">surelyApart</span></span>
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1197
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1171
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<pre style="margin: 0;"> <span id="LC1171" class="line" lang="haskell"> <span class="p">}}}}</span></span>
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1198
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1172
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<pre style="margin: 0;"> <span id="LC1172" class="line" lang="haskell"></span>
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1199
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1173
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<pre style="margin: 0;"> <span id="LC1173" class="line" lang="haskell"><span class="n" style="color: #333;">uUnrefined</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tv1'</span> <span class="n" style="color: #333;">ty2</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">kco</span> <span class="c1" style="color: #998; font-style: italic;">-- ty2 is not a type variable</span></span>
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1200
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1174
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<pre style="margin: 0;"> <span id="LC1174" 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;">tvBindFlag</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tv1'</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1201
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<pre style="margin: 0;">-<span id="LC1201" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Skolem</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">surelyApart</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [Unification with skolems]</span></span></span>
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1175
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<pre style="margin: 0;">+<span id="LC1175" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Skolem</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">surelyApart</span></span>
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1202
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1176
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<pre style="margin: 0;"> <span id="LC1176" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BindMe</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">bindTv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tv1'</span> <span class="p">(</span><span class="n" style="color: #333;">ty2</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span></span>
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1203
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1177
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<pre style="margin: 0;"> <span id="LC1177" class="line" lang="haskell"></span>
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1204
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1178
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<pre style="margin: 0;"> <span id="LC1178" class="line" lang="haskell"><span class="n" style="color: #333;">bindTv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UMEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OutTyVar</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;">UM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1242" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1216" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1242,6 +1216,8 @@ data BindFlag</td>
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1242
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1216
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<pre style="margin: 0;"> <span id="LC1216" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Skolem</span> <span class="c1" style="color: #998; font-style: italic;">-- This type variable is a skolem constant</span></span>
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1243
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1217
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<pre style="margin: 0;"> <span id="LC1217" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't bind it; it only matches itself</span></span>
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1244
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1218
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<pre style="margin: 0;"> <span id="LC1218" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These variables are SurelyApart from other types</span></span>
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1219
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<pre style="margin: 0;">+<span id="LC1219" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Binding when looking up instances] in GHC.Core.InstEnv</span></span>
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1220
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<pre style="margin: 0;">+<span id="LC1220" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for why it must be SurelyApart.</span></span>
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1245
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1221
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<pre style="margin: 0;"> <span id="LC1221" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>
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1246
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1222
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<pre style="margin: 0;"> <span id="LC1222" class="line" lang="haskell"></span>
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1247
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1223
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<pre style="margin: 0;"> <span id="LC1223" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/11802fc3cb9d1a9bfe84193ed7f58508389f839c#528aacc312e31d522c6e47247763aedb807caeec"><strong>compiler/GHC/Tc/Solver/Rewrite.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">@@ -1023,6 +1023,6 @@ ty_con_binders_ty_binders' = foldr go ([], False)</td>
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1023
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1023
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<pre style="margin: 0;"> <span id="LC1023" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NamedTCB</span> <span class="n" style="color: #333;">vis</span><span class="p">))</span> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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1024
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Named</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">vis</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="1025" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1025
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AnonTCB</span> <span class="n" style="color: #333;">af</span><span class="p">))</span> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1026" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1026
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<pre style="margin: 0;">-<span id="LC1026" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Anon</span> <span class="n" style="color: #333;">af</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">unrestricted</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tyVarKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv</span></span><span class="p"><span class="idiff">))</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1027" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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1026
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<pre style="margin: 0;">+<span id="LC1026" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Anon</span> <span class="n" style="color: #333;">af</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">tymult</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tyVarKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv</span></span><span class="p"><span class="idiff right">))</span></span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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1027
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1027
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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# INLINE go #-}</span></span>
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1028
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1028
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<pre style="margin: 0;"> <span id="LC1028" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE ty_con_binders_ty_binders' #-}</span></span></pre>
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