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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/99b6f9fa06dfb4338d20e205829d608160548e04">99b6f9fa</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-24T15:54:15-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Accommodate #18987
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ae2ad19e581fb0ad987c6b84ac291bd138f7991">6ae2ad19</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-24T15:55:45-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">let-bound skolems
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<h4>2 changed files:</h4>
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<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<h4>Changes:</h4>
<li id="f018e77421f495c6f75733fee4a511cfe57bebe8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/65a7815c04574e49e62cc457d8476287366f62a4...6ae2ad19e581fb0ad987c6b84ac291bd138f7991#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -710,8 +710,11 @@ canIrred ev</td>
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">new_ev</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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711
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<pre style="margin: 0;"> <span id="LC711" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassPred</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">canClassNC</span> <span class="n" style="color: #333;">new_ev</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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712
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">canEqNC</span> <span class="n" style="color: #333;">new_ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC713" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ForAllPred</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"rewriting revealed a ForAllTy"</span></span>
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<pre style="margin: 0;">-<span id="LC714" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ForAllPred</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">th</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">-></span> <span class="c1" style="color: #998; font-style: italic;">-- this is highly suspect; Quick Look</span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- should never leave a meta-var filled</span></span>
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in with a polytype. This is #18987.</span></span>
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canEvNC:forall"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"> <span class="n" style="color: #333;">canForAllNC</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">th</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC718" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IrredPred</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">continueWith</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="haskell"> <span class="n" style="color: #333;">mkIrredCt</span> <span class="kt" style="color: #458; font-weight: 600;">OtherCIS</span> <span class="n" style="color: #333;">new_ev</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC720" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/65a7815c04574e49e62cc457d8476287366f62a4...6ae2ad19e581fb0ad987c6b84ac291bd138f7991#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.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">@@ -2146,7 +2146,7 @@ getHasGivenEqs tclvl</td>
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<pre style="margin: 0;"> <span id="LC2146" class="line" lang="haskell"> <span class="n" style="color: #333;">check_local_given_tv_eq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HasGivenEqs</span></span>
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<pre style="margin: 0;"> <span id="LC2147" class="line" lang="haskell"> <span class="n" style="color: #333;">check_local_given_tv_eq</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span><span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC2148" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">given_here</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">-<span id="LC2149" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">is_outer_var</span> <span class="n" style="color: #333;">tv</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeGivenEqs</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Local</span>GivenEqs</span></span>
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<pre style="margin: 0;">+<span id="LC2149" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">is_outer_var</span> <span class="n" style="color: #333;">tv</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeGivenEqs</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">No</span>GivenEqs</span></span>
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<pre style="margin: 0;"> <span id="LC2150" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Let-bound skolems]</span></span>
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<pre style="margin: 0;"> <span id="LC2151" 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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<pre style="margin: 0;"> <span id="LC2152" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span></span>
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