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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/803bbf04f5df6bb58f8cf05b74c82535184430fe">803bbf04</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-24T15:14:44-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce canNC
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<h4>3 changed files:</h4>
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
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<h4>Changes:</h4>
<li id="f018e77421f495c6f75733fee4a511cfe57bebe8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/803bbf04f5df6bb58f8cf05b74c82535184430fe#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">@@ -92,32 +92,20 @@ last time through, so we can skip the classification step.</td>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"><span class="n" style="color: #333;">canonicalize</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;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="n" style="color: #333;">canonicalize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CNonCanonical</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="LC94" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC "canNC" #-}</span></span>
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<pre style="margin: 0;">-<span id="LC95" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="n" style="color: #333;">pred</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC96" 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="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canEvNC:cls"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC97" class="line" lang="haskell"> <span class="n" style="color: #333;">canClassNC</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC98" 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="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canEvNC:eq"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty1</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"> <span class="n" style="color: #333;">canEqNC</span> <span class="n" style="color: #333;">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="LC100" 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="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canEvNC:irred"</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="LC101" class="line" lang="haskell"> <span class="n" style="color: #333;">canIrred</span> <span class="kt" style="color: #458; font-weight: 600;">OtherCIS</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">-<span id="LC102" 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="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="LC103" 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="LC104" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC105" class="line" lang="haskell"> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"> <span class="n" style="color: #333;">canNC</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"><span class="n" style="color: #333;">canonicalize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CQuantCan</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">QCI</span> <span class="p">{</span> <span class="n" style="color: #333;">qci_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">qci_pend_sc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pend_sc</span> <span class="p">}))</span></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canForAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">pend_sc</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="haskell"><span class="n" style="color: #333;">canonicalize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CIrredCan</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 class="n" style="color: #333;">cc_status</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">status</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <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;">classifyPredType</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- For insolubles (all of which are equalities), do /not/ rewrite the arguments</span></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="n" style="color: #333;">canonicalize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CIrredCan</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="LC101" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canNC</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Instead of rewriting the evidence before classifying, it's possible we</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- can make progress without the rewrite. Try this first.</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For insolubles (all of which are equalities), do /not/ rewrite the arguments</span></span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In #14350 doing so led entire-unnecessary and ridiculously large</span></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type function expansion. Instead, canEqNC just applies</span></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the substitution to the predicate, and may do decomposition;</span></span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. a ~ [a], where [G] a ~ [Int], can decompose</span></span>
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<pre style="margin: 0;">-<span id="LC117" class="line" lang="haskell"> <span class="n" style="color: #333;">canEqNC</span> <span class="n" style="color: #333;">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="LC118" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC119" 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="LC120" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canIrred</span> <span class="n" style="color: #333;">status</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"><span class="n" style="color: #333;">canonicalize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CDictCan</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 class="n" style="color: #333;">cc_class</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cls</span></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_tyargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">xis</span><span class="p">,</span> <span class="n" style="color: #333;">cc_pend_sc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pend_sc</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">@@ -131,6 +119,20 @@ canonicalize (CEqCan { cc_ev = ev</td>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC "canEqLeafTyVarEq" #-}</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"> <span class="n" style="color: #333;">canEqNC</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="p">(</span><span class="n" style="color: #333;">canEqLHSType</span> <span class="n" style="color: #333;">lhs</span><span class="p">)</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"><span class="n" style="color: #333;">canNC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"><span class="n" style="color: #333;">canNC</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="n" style="color: #333;">pred</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC125" 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="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canEvNC:cls"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"> <span class="n" style="color: #333;">canClassNC</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC127" 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="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canEvNC:eq"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty1</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"> <span class="n" style="color: #333;">canEqNC</span> <span class="n" style="color: #333;">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="LC129" 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="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canEvNC:irred"</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="LC130" class="line" lang="haskell"> <span class="n" style="color: #333;">canIrred</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC131" 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="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="LC132" 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="LC133" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC136" 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="LC137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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138
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="694" 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="696" 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">@@ -694,24 +696,24 @@ See also Note [Evidence for quantified constraints] in GHC.Core.Predicate.</td>
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<pre style="margin: 0;"> <span id="LC696" 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="LC697" 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="LC698" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="haskell"><span class="n" style="color: #333;">canIrred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct<span class="idiff left">IrredStatus</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Ct</span>Evidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell"><span class="n" style="color: #333;">canIrred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: ty not a tuple and no other evidence form</span></span>
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<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell"><span class="n" style="color: #333;">canIrred</span> <span class="n" style="color: #333;"><span class="idiff left">status</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC701" class="line" lang="haskell"><span class="n" style="color: #333;">canIrred</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC702" 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="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"can_pred"</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"IrredPred = "</span> <span class="o" style="font-weight: 600;"><+></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="LC704" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi</span><span class="p">,</span><span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewrite</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">pred</span> <span class="c1" style="color: #998; font-style: italic;">-- co :: xi ~ pred</span></span>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span> <span class="p">`</span><span class="n" style="color: #333;">andWhenContinue</span><span class="p">`</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Re-classify, in case rewriting has improved its shape</span></span>
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<pre style="margin: 0;">-<span id="LC706" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Code is like the <span class="idiff left right">CNonCanonical case of canonicalize</span>, except</span></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Code is like the <span class="idiff left right">canNC</span>, except</span></span>
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<pre style="margin: 0;"> <span id="LC709" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that the IrredPred branch stops work</span></span>
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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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<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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<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="LC711" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ForAllPred</span> <span class="n" style="color: #333;"><span class="idiff left">tvs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">th</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">p</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">do</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">traceTcS</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"canEvNC:forall"</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pred</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">-<span id="LC712" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">canForAllNC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">th</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">p</span></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 class="idiff left">{}</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pprPanic</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff right">"rewriting revealed a ForAllTy"</span></span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC715" 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="LC714" class="line" lang="haskell"> <span class="n" style="color: #333;">mkIrredCt</span> <span class="n" style="color: #333;"><span class="idiff left right">status</span></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="LC716" class="line" lang="haskell"> <span class="n" style="color: #333;">mkIrredCt</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">OtherCIS</span></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="LC717" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC718" 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="LC719" 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/803bbf04f5df6bb58f8cf05b74c82535184430fe#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.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">@@ -1448,7 +1448,7 @@ data TcEvDest</td>
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<pre style="margin: 0;"> <span id="LC1448" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1449" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HoleDest</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ fill in this hole with the evidence</span></span>
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<pre style="margin: 0;"> <span id="LC1450" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- HoleDest is always used for type-equalities</span></span>
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<pre style="margin: 0;">-<span id="LC1451" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Coercion holes] in <span class="idiff left right">"GHC.Core.TyCo.Rep"</span></span></span>
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<pre style="margin: 0;">+<span id="LC1451" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Coercion holes] in <span class="idiff left right">GHC.Core.TyCo.Rep</span></span></span>
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<pre style="margin: 0;"> <span id="LC1452" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1453" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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<pre style="margin: 0;"> <span id="LC1454" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtGiven</span> <span class="c1" style="color: #998; font-style: italic;">-- Truly given, not depending on subgoals</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/803bbf04f5df6bb58f8cf05b74c82535184430fe#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590"><strong>compiler/GHC/Tc/Utils/TcType.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">@@ -83,7 +83,7 @@ module GHC.Tc.Utils.TcType (</td>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isIntegerTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNaturalTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isBoolTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUnitTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCharTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCallStackTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCallStackPred</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isTauTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTauTyCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcIsTyVarTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcIsForAllTy</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC86" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isPredTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTyVarClassPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">is<span class="idiff left">TyVarHead</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">is</span>InsolubleOccursCheck</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isPredTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTyVarClassPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isInsolubleOccursCheck</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkValidClsArgs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hasTyVarHead</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isRigidTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC89" 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">@@ -2136,18 +2136,6 @@ is_tc uniq ty = case tcSplitTyConApp_maybe ty of</td>
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2136
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2136
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<pre style="margin: 0;"> <span id="LC2136" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">getUnique</span> <span class="n" style="color: #333;">tc</span></span>
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2137
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<pre style="margin: 0;"> <span id="LC2137" 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;">False</span></span>
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2138
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2138
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<pre style="margin: 0;"> <span id="LC2138" class="line" lang="haskell"></span>
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2139
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<pre style="margin: 0;">-<span id="LC2139" class="line" lang="haskell"><span class="cd">-- | Does the given tyvar appear at the head of a chain of applications</span></span>
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<pre style="margin: 0;">-<span id="LC2140" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a t1 ... tn)</span></span>
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2141
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<pre style="margin: 0;">-<span id="LC2141" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVarHead</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</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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2142
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<pre style="margin: 0;">-<span id="LC2142" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVarHead</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tv'</span></span>
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2143
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<pre style="margin: 0;">-<span id="LC2143" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVarHead</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="n" style="color: #333;">fun</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTyVarHead</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">fun</span></span>
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2144
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<pre style="margin: 0;">-<span id="LC2144" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVarHead</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTyVarHead</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span></span>
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2145
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<pre style="margin: 0;">-<span id="LC2145" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVarHead</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2146
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<pre style="margin: 0;">-<span id="LC2146" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVarHead</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LitTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2147
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<pre style="margin: 0;">-<span id="LC2147" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVarHead</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC2148" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVarHead</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2149
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<pre style="margin: 0;">-<span id="LC2149" class="line" lang="haskell"><span class="n" style="color: #333;">isTyVarHead</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2150
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<pre style="margin: 0;">-<span id="LC2150" class="line" lang="haskell"></span>
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2151
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2139
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<pre style="margin: 0;"> <span id="LC2139" class="line" lang="haskell"></span>
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2152
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2140
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<pre style="margin: 0;"> <span id="LC2140" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [AppTy and ReprEq]</span></span>
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2153
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2141
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<pre style="margin: 0;"> <span id="LC2141" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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