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<h3>
Sebastian Graf pushed to branch wip/T18341
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1cf8d5e6d8fc8736a88a6740fb9577b6ab318f8">f1cf8d5e</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-07-02T15:54:13+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a few bugs
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1888d46e4cbb27f7d0a3ba89bf4f69bfc5776f0">d1888d46</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-07-02T15:54:22+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Accept tests
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<h4>4 changed files:</h4>
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<li class="file-stats">
<a href="#ac0a6473a902628a18b3a470122e5cc1ce09de14">
compiler/GHC/HsToCore/PmCheck.hs
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<li class="file-stats">
<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
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<li class="file-stats">
<a href="#e77c2349085a6a6d7d8497374e962fb5a3507b84">
testsuite/tests/pmcheck/should_compile/TooManyDeltas.hs
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<li class="file-stats">
<a href="#94aa51e6715e17adfa284ea82a9eb53d9dce2bde">
testsuite/tests/pmcheck/should_compile/TooManyDeltas.stderr
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<h4>Changes:</h4>
<li id="ac0a6473a902628a18b3a470122e5cc1ce09de14">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/874ab47e9924257eff4887a710a7c62dc51de854...d1888d46e4cbb27f7d0a3ba89bf4f69bfc5776f0#ac0a6473a902628a18b3a470122e5cc1ce09de14"><strong>compiler/GHC/HsToCore/PmCheck.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">@@ -992,19 +992,21 @@ checkGrdTree' (Rhs sdoc) deltas = do</td>
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<pre style="margin: 0;"> <span id="LC992" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- let x = e: Refine with x ~ e</span></span>
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<pre style="margin: 0;"> <span id="LC993" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrdTree'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Guard</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmLet</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">tree</span><span class="p">)</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC994" class="line" lang="haskell"> <span class="n" style="color: #333;">deltas'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmCoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC995" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"check:Let"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'='</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC996" class="line" lang="haskell"> <span class="n" style="color: #333;">checkGrdTree'</span> <span class="n" style="color: #333;">tree</span> <span class="n" style="color: #333;">deltas'</span></span>
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<pre style="margin: 0;"> <span id="LC997" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Bang x: Diverge on x ~ ⊥, refine with x /~ ⊥</span></span>
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<pre style="margin: 0;"> <span id="LC998" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrdTree'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Guard</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmBang</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">tree</span><span class="p">)</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC999" class="line" lang="haskell"> <span class="n" style="color: #333;">has_diverged</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">isInhabited</span></span>
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<pre style="margin: 0;">-<span id="LC999" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"checkGrdTree':PmBang"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">has_diverged</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1000" class="line" lang="haskell"> <span class="n" style="color: #333;">deltas'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1001" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"check:Bang"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">has_diverged</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">deltas'</span><span class="p">)</span></span>
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1002
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<pre style="margin: 0;"> <span id="LC1002" class="line" lang="haskell"> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGrdTree'</span> <span class="n" style="color: #333;">tree</span> <span class="n" style="color: #333;">deltas'</span></span>
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">res</span><span class="p">{</span> <span class="n" style="color: #333;">cr_clauses</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">applyWhen</span> <span class="n" style="color: #333;">has_diverged</span> <span class="n" style="color: #333;">mayDiverge</span> <span class="p">(</span><span class="n" style="color: #333;">cr_clauses</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1004" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Con: Fall through on x /~ K, refine with x ~ K ys and type info</span></span>
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1005
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<pre style="margin: 0;"> <span id="LC1005" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrdTree'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Guard</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmCon</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="n" style="color: #333;">tree</span><span class="p">)</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC1006" class="line" lang="haskell"> <span class="n" style="color: #333;">unc_this</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNotConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1006" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"checkGrdTree'"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">pmConCts</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC1007" class="line" lang="haskell"> <span class="n" style="color: #333;">deltas'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtsDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="n" style="color: #333;">pmConCts</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pmConCts</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span></span>
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1008
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"check:Con"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span></span>
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1009
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<pre style="margin: 0;">+<span id="LC1009" class="line" lang="haskell"> <span class="n" style="color: #333;">deltas'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtsDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="n" style="color: #333;">cts</span></span>
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1008
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1010
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<pre style="margin: 0;"> <span id="LC1010" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="n" style="color: #333;">tree'</span> <span class="n" style="color: #333;">unc_inner</span> <span class="n" style="color: #333;">prec</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGrdTree'</span> <span class="n" style="color: #333;">tree</span> <span class="n" style="color: #333;">deltas'</span></span>
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1009
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1011
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<pre style="margin: 0;"> <span id="LC1011" class="line" lang="haskell"> <span class="n" style="color: #333;">limit</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">maxPmCheckModels</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getDynFlags</span></span>
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1010
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1012
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<pre style="margin: 0;"> <span id="LC1012" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">prec'</span><span class="p">,</span> <span class="n" style="color: #333;">unc'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">throttle</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="n" style="color: #333;">unc_this</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">unc_inner</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1016" 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">@@ -1014,6 +1016,7 @@ checkGrdTree' (Guard (PmCon x con tvs dicts args) tree) deltas = do</td>
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prec</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">prec'</span> <span class="p">}</span></span>
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1015
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Sequence: Thread residual uncovered sets from equation to equation</span></span>
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1018
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<pre style="margin: 0;"> <span id="LC1018" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrdTree'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Sequence</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">unc_0</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"check:Sequence:l"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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1017
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="n" style="color: #333;">l'</span> <span class="n" style="color: #333;">unc_1</span> <span class="n" style="color: #333;">prec_l</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGrdTree'</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">unc_0</span></span>
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1018
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="n" style="color: #333;">r'</span> <span class="n" style="color: #333;">unc_2</span> <span class="n" style="color: #333;">prec_r</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGrdTree'</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">unc_1</span></span>
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1019
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1022
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span></span>
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<li id="8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/874ab47e9924257eff4887a710a7c62dc51de854...d1888d46e4cbb27f7d0a3ba89bf4f69bfc5776f0#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564"><strong>compiler/GHC/HsToCore/PmCheck/Oracle.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="518" 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">@@ -518,7 +518,7 @@ tyIsSatisfiable recheck_complete_sets new_ty_cs = SC $ \delta -></td>
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518
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518
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty_st'</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">delta'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">delta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_ty_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_st'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">recheck_complete_sets</span></span>
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<pre style="margin: 0;">-<span id="LC521" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">ensureAll<span class="idiff left right">PossibleMatches</span>Inhabited</span> <span class="n" style="color: #333;">delta'</span></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">ensureAllInhabited</span> <span class="n" style="color: #333;">delta'</span></span>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">delta'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC524" 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">@@ -705,13 +705,6 @@ initPossibleMatches ty_st vi@VI{ vi_ty = ty, vi_cache = NoPM } = do</td>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PM</span> <span class="p">(</span><span class="n" style="color: #333;">mkUniqDSet</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">cs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"><span class="n" style="color: #333;">initPossibleMatches</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">vi</span></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC708" class="line" lang="haskell"><span class="cd">-- | @initLookupVarInfo ts x@ looks up the 'VarInfo' for @x@ in @ts@ and tries</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;">-- to initialise the 'vi_cache' component if it was 'NoPM' through</span></span>
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<pre style="margin: 0;">-<span id="LC710" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'initPossibleMatches'.</span></span>
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<pre style="margin: 0;">-<span id="LC711" class="line" lang="haskell"><span class="n" style="color: #333;">initLookupVarInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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<pre style="margin: 0;">-<span id="LC712" class="line" lang="haskell"><span class="n" style="color: #333;">initLookupVarInfo</span> <span class="kt" style="color: #458; font-weight: 600;">MkDelta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">,</span> <span class="n" style="color: #333;">delta_ty_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_st</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC713" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initPossibleMatches</span> <span class="n" style="color: #333;">ty_st</span> <span class="p">(</span><span class="n" style="color: #333;">lookupVarInfo</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC714" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [COMPLETE sets on data families]</span></span>
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<pre style="margin: 0;"> <span id="LC709" 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="LC710" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">User-defined COMPLETE sets involving data families are attached to the family</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">@@ -919,8 +912,8 @@ addBotCt delta@MkDelta{ delta_tm_st = TmSt env reps } x = do</td>
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912
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<pre style="margin: 0;"> <span id="LC912" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that leads to a contradiction.</span></span>
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<pre style="margin: 0;"> <span id="LC913" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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914
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<pre style="margin: 0;"> <span id="LC914" class="line" lang="haskell"><span class="n" style="color: #333;">addNotConCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span></span>
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<pre style="margin: 0;">-<span id="LC922" class="line" lang="haskell"><span class="n" style="color: #333;">addNotConCt</span> <span class="n" style="color: #333;">delta</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkDelta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TmSt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">reps</span></span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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923
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<pre style="margin: 0;">-<span id="LC923" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">vi</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">VI</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">neg</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pm</span></span><span class="p"><span class="idiff">)</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">lift</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">initLookupVarInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC915" class="line" lang="haskell"><span class="n" style="color: #333;">addNotConCt</span> <span class="n" style="color: #333;">delta</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkDelta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">ts</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmSt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">reps</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vi</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">VI</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">neg</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pm</span></span><span class="p"><span class="idiff">)</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">lookupVarInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">x</span></span></span>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. Bail out quickly when nalt contradicts a solution</span></span>
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925
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918
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">contradicts</span> <span class="n" style="color: #333;">nalt</span> <span class="p">(</span><span class="n" style="color: #333;">cl</span><span class="p">,</span> <span class="n" style="color: #333;">_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqPmAltCon</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Equal</span></span>
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926
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919
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<pre style="margin: 0;"> <span id="LC919" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">contradicts</span> <span class="n" style="color: #333;">nalt</span><span class="p">)</span> <span class="n" style="color: #333;">pos</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">@@ -932,13 +925,13 @@ addNotConCt delta@MkDelta{ delta_tm_st = TmSt env reps } x nalt = do</td>
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932
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925
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<pre style="margin: 0;"> <span id="LC925" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Completeness checking with required Thetas]</span></span>
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933
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926
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">hasRequiredTheta</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg</span></span>
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934
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927
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendPmAltConSet</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">nalt</span></span>
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935
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<pre style="margin: 0;">-<span id="LC935" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi<span class="idiff left right">_ext</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg'</span> <span class="p">}</span></span>
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928
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<pre style="margin: 0;">+<span id="LC928" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi<span class="idiff left right">1</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neg'</span> <span class="p">}</span></span>
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936
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929
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<pre style="margin: 0;"> <span id="LC929" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. Make sure there's at least one other possible constructor</span></span>
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<pre style="margin: 0;">-<span id="LC937" class="line" lang="haskell"> <span class="n" style="color: #333;">vi<span class="idiff left right">'</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">nalt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"> <span class="n" style="color: #333;">vi<span class="idiff left right">2</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">nalt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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938
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931
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<pre style="margin: 0;"> <span id="LC931" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span></span>
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939
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<pre style="margin: 0;">-<span id="LC939" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="p">(</span><span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">vi<span class="idiff left right">_ext</span></span><span class="p">{</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">markMatched</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">pm</span> <span class="p">})</span></span>
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940
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<pre style="margin: 0;">-<span id="LC940" 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;">pure</span> <span class="n" style="color: #333;">vi<span class="idiff left right">_ext</span></span></span>
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941
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<pre style="margin: 0;">-<span id="LC941" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">delta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">vi<span class="idiff left right">'</span></span><span class="p">)</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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932
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<pre style="margin: 0;">+<span id="LC932" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="p">(</span><span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">vi<span class="idiff left right">1</span></span><span class="p">{</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">markMatched</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">pm</span> <span class="p">})</span></span>
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933
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<pre style="margin: 0;">+<span id="LC933" 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;">pure</span> <span class="n" style="color: #333;">vi<span class="idiff left right">1</span></span></span>
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<pre style="margin: 0;">+<span id="LC934" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">delta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">vi<span class="idiff left right">2</span></span><span class="p">)</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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935
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<pre style="margin: 0;"> <span id="LC935" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC936" class="line" lang="haskell"><span class="n" style="color: #333;">hasRequiredTheta</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</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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937
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<pre style="margin: 0;"> <span id="LC937" class="line" lang="haskell"><span class="n" style="color: #333;">hasRequiredTheta</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">notNull</span> <span class="n" style="color: #333;">req_theta</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1003" 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">@@ -1010,8 +1003,8 @@ addNotBotCt delta@MkDelta{ delta_tm_st = TmSt env reps } x = do</td>
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1010
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1003
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mzero</span> <span class="c1" style="color: #998; font-style: italic;">-- There was x ~ ⊥. Contradiction!</span></span>
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1011
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1004
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<pre style="margin: 0;"> <span id="LC1004" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">delta</span> <span class="c1" style="color: #998; font-style: italic;">-- There already is x /~ ⊥. Nothing left to do</span></span>
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1012
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1005
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<pre style="margin: 0;"> <span id="LC1005" 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="kr" style="font-weight: 600;">do</span> <span class="c1" style="color: #998; font-style: italic;">-- We add x /~ ⊥ and test if x is still inhabited</span></span>
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1013
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<pre style="margin: 0;">-<span id="LC1013" class="line" lang="haskell"> <span class="n" style="color: #333;">vi<span class="idiff left right">'</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">}</span></span>
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1014
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<pre style="margin: 0;">-<span id="LC1014" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">delta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">vi<span class="idiff left right">'</span></span><span class="p">)</span> <span class="n" style="color: #333;">reps</span><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">}</span></span>
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1007
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">delta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="p">(</span><span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span> <span class="n" style="color: #333;">reps</span><span class="p">}</span></span>
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1015
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1008
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<pre style="margin: 0;"> <span id="LC1008" class="line" lang="haskell"></span>
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1016
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1009
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<pre style="margin: 0;"> <span id="LC1009" class="line" lang="haskell"><span class="n" style="color: #333;">ensureInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span><span class="p">)</span></span>
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1017
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1010
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<pre style="margin: 0;"> <span id="LC1010" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Returns (Just vi) if at least one member of each ConLike in the COMPLETE</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1017" 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">@@ -1024,7 +1017,9 @@ ensureInhabited :: Delta -> VarInfo -> DsM (Maybe VarInfo)</td>
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1024
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- avoids doing unnecessary work.</span></span>
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1025
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1018
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<pre style="margin: 0;"> <span id="LC1018" class="line" lang="haskell"><span class="n" style="color: #333;">ensureInhabited</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">VI</span><span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span></span>
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1026
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"><span class="n" style="color: #333;">ensureInhabited</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">VI</span><span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span></span>
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1027
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<pre style="margin: 0;">-<span id="LC1027" class="line" lang="haskell"><span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fmap</span> <span class="p">(</span><span class="n" style="color: #333;">set_cache</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">test</span> <span class="p">(</span><span class="n" style="color: #333;">vi_cache</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- This would be much less tedious with lenses</span></span>
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1020
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"><span class="n" style="color: #333;">ensureInhabited</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">initPossibleMatches</span> <span class="p">(</span><span class="n" style="color: #333;">delta_ty_st</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="n" style="color: #333;">vi</span></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"> <span class="n" style="color: #333;">fmap</span> <span class="p">(</span><span class="n" style="color: #333;">set_cache</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">test</span> <span class="p">(</span><span class="n" style="color: #333;">vi_cache</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span></span>
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1028
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1023
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<pre style="margin: 0;"> <span id="LC1023" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1029
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"> <span class="n" style="color: #333;">set_cache</span> <span class="n" style="color: #333;">vi</span> <span class="n" style="color: #333;">cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vi</span> <span class="p">{</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cache</span> <span class="p">}</span></span>
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1030
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1054" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1059,7 +1054,7 @@ ensureInhabited delta vi = fmap (set_cache vi) <$> test (vi_cache vi) -- This wo</td>
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1059
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1054
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<pre style="margin: 0;"> <span id="LC1054" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No need to run the term oracle compared to pmIsSatisfiable</span></span>
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1060
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1055
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<pre style="margin: 0;"> <span id="LC1055" class="line" lang="haskell"> <span class="n" style="color: #333;">fmap</span> <span class="n" style="color: #333;">isJust</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">runSatisfiabilityCheck</span> <span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mconcat</span></span>
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1061
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1056
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<pre style="margin: 0;"> <span id="LC1056" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Important to pass False to tyIsSatisfiable here, so that we won't</span></span>
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1062
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<pre style="margin: 0;">-<span id="LC1062" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- recursively call ensureAll<span class="idiff left right">PossibleMatches</span>Inhabited, leading to an</span></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- recursively call ensureAllInhabited, leading to an</span></span>
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1063
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1058
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<pre style="margin: 0;"> <span id="LC1058" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- endless recursion.</span></span>
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1064
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1059
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<pre style="margin: 0;"> <span id="LC1059" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">tyIsSatisfiable</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ty_cs</span></span>
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1065
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1060
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tysAreNonVoid</span> <span class="n" style="color: #333;">initRecTc</span> <span class="n" style="color: #333;">strict_arg_tys</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">@@ -1069,8 +1064,8 @@ ensureInhabited delta vi = fmap (set_cache vi) <$> test (vi_cache vi) -- This wo</td>
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1069
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'vi_cache', considering the current type information in 'Delta'.</span></span>
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1070
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This check is necessary after having matched on a GADT con to weed out</span></span>
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1071
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1066
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<pre style="margin: 0;"> <span id="LC1066" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- impossible matches.</span></span>
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1072
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<pre style="margin: 0;">-<span id="LC1072" class="line" lang="haskell"><span class="n" style="color: #333;">ensureAll<span class="idiff left right">PossibleMatches</span>Inhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span><span class="p">)</span></span>
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1073
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<pre style="margin: 0;">-<span id="LC1073" class="line" lang="haskell"><span class="n" style="color: #333;">ensureAll<span class="idiff left right">PossibleMatches</span>Inhabited</span> <span class="n" style="color: #333;">delta</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkDelta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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1067
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"><span class="n" style="color: #333;">ensureAllInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span><span class="p">)</span></span>
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1068
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<pre style="margin: 0;">+<span id="LC1068" class="line" lang="haskell"><span class="n" style="color: #333;">ensureAllInhabited</span> <span class="n" style="color: #333;">delta</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkDelta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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1074
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1069
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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</span> <span class="p">(</span><span class="n" style="color: #333;">set_tm_cs_env</span> <span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverseSDIE</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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1075
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1070
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1076
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1071
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="n" style="color: #333;">set_tm_cs_env</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">delta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1136" 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="1131" 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">@@ -1136,8 +1131,8 @@ equate delta@MkDelta{ delta_tm_st = TmSt env reps } x y</td>
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1136
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1131
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<pre style="margin: 0;"> <span id="LC1131" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1137
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1132
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<pre style="margin: 0;"> <span id="LC1132" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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1138
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1133
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<pre style="margin: 0;"> <span id="LC1133" class="line" lang="haskell"><span class="n" style="color: #333;">addConCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span></span>
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1139
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<pre style="margin: 0;">-<span id="LC1139" class="line" lang="haskell"><span class="n" style="color: #333;">addConCt</span> <span class="n" style="color: #333;">delta</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkDelta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TmSt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">reps</span></span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1140
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<pre style="margin: 0;">-<span id="LC1140" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">VI</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">neg</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bot</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cache</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">lift</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">initLookupVarInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff right">)</span></span></span>
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1134
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<pre style="margin: 0;">+<span id="LC1134" class="line" lang="haskell"><span class="n" style="color: #333;">addConCt</span> <span class="n" style="color: #333;">delta</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkDelta</span><span class="p">{</span> <span class="n" style="color: #333;">delta_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">ts</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmSt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">reps</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1135
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<pre style="margin: 0;">+<span id="LC1135" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">VI</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">neg</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bot</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cache</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">lookupVarInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">x</span></span></span>
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1141
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1136
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<pre style="margin: 0;"> <span id="LC1136" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First try to refute with a negative fact</span></span>
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1142
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1137
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<pre style="margin: 0;"> <span id="LC1137" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">elemPmAltConSet</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">neg</span><span class="p">))</span></span>
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1143
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1138
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<pre style="margin: 0;"> <span id="LC1138" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then see if any of the other solutions (remember: each of them is an</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">@@ -1562,7 +1557,7 @@ provideEvidence = go</td>
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1562
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1557
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<pre style="margin: 0;"> <span id="LC1557" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">[</span><span class="n" style="color: #333;">delta</span><span class="p">]</span></span>
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1563
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1558
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<pre style="margin: 0;"> <span id="LC1558" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1564
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1559
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<pre style="margin: 0;"> <span id="LC1559" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"provideEvidence"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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1565
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<pre style="margin: 0;">-<span id="LC1565" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">VI</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">neg</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</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">initLookupVarInfo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">delta</span></span> <span class="n" style="color: #333;">x</span></span>
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1560
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<pre style="margin: 0;">+<span id="LC1560" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">VI</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pos</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">neg</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</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">lookupVarInfo</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">delta_tm_st</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">delta</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">x</span></span>
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1566
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1561
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<pre style="margin: 0;"> <span id="LC1561" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">pos</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1567
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1562
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<pre style="margin: 0;"> <span id="LC1562" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1568
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1563
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<pre style="margin: 0;"> <span id="LC1563" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- All solutions must be valid at once. Try to find candidates for their</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">@@ -1600,8 +1595,9 @@ provideEvidence = go</td>
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<pre style="margin: 0;"> <span id="LC1595" 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="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC1596" 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;">y</span><span class="p">,</span> <span class="n" style="color: #333;">newty_delta</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1602
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1597
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<pre style="margin: 0;"> <span id="LC1597" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Pick a COMPLETE set and instantiate it (n at max). Take care of ⊥.</span></span>
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<pre style="margin: 0;">-<span id="LC1603" class="line" lang="haskell"> <span class="n" style="color: #333;">pm</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">vi_cache</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">initLookupVarInfo</span> <span class="n" style="color: #333;">newty_delta</span> <span class="n" style="color: #333;">y</span></span>
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1604
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<pre style="margin: 0;">-<span id="LC1604" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_cls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pickMinimalCompleteSet</span> <span class="n" style="color: #333;">newty_delta</span> <span class="n" style="color: #333;">pm</span></span>
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<pre style="margin: 0;">+<span id="LC1598" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarInfo</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_st</span> <span class="n" style="color: #333;">newty_delta</span><span class="p">)</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC1599" class="line" lang="haskell"> <span class="n" style="color: #333;">vi</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">initPossibleMatches</span> <span class="p">(</span><span class="n" style="color: #333;">delta_ty_st</span> <span class="n" style="color: #333;">newty_delta</span><span class="p">)</span> <span class="n" style="color: #333;">vi</span></span>
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<pre style="margin: 0;">+<span id="LC1600" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_cls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pickMinimalCompleteSet</span> <span class="n" style="color: #333;">newty_delta</span> <span class="p">(</span><span class="n" style="color: #333;">vi_cache</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1601" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">uniqDSetToList</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mb_cls</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1602
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<pre style="margin: 0;"> <span id="LC1602" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cls</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</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;">instantiate_cons</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">core_ty</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">newty_delta</span> <span class="n" style="color: #333;">cls</span></span>
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<pre style="margin: 0;"> <span id="LC1603" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">canDiverge</span> <span class="n" style="color: #333;">newty_delta</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/874ab47e9924257eff4887a710a7c62dc51de854...d1888d46e4cbb27f7d0a3ba89bf4f69bfc5776f0#e77c2349085a6a6d7d8497374e962fb5a3507b84"><strong>testsuite/tests/pmcheck/should_compile/TooManyDeltas.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">@@ -3,8 +3,10 @@</td>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- As a result, these functions elicit the symptoms describe in the warnings</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- message, e.g.</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - False positives on exhaustivity</span></span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - Turns redundant into inaccessible clauses</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - Fails to report redundant matches</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We used to turn redundant into inaccessible clauses, but SG was unable to</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- produce a testcase. See the comment below.</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">TooManyDeltas</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">B</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">@@ -13,12 +15,19 @@ data T = A | B</td>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- SG: As of July 2020, g doesn't reproduce anymore.</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Because we treat constructor matches lazily and push data con match</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- strictness into a preceding bang guard, The single place that calls the</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- throttling function will not regress in laziness. Note that by throttling we</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- can only "forget" the x /~ K constraint from unc_this, not the preceding</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- x /~ ⊥ constraint.</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="cd">-- | Reports that the third clause is inaccessible, when really it is</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundant.</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- inaccessible, correctly flagged</span></span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- redundant, <span class="idiff left right">not inaccessible!</span></span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- redundant, <span class="idiff left right">used to be inaccessible (see above).</span></span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- (this one is not about exhaustivity)</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="cd">-- | Fails to report that the second clause is redundant.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/874ab47e9924257eff4887a710a7c62dc51de854...d1888d46e4cbb27f7d0a3ba89bf4f69bfc5776f0#94aa51e6715e17adfa284ea82a9eb53d9dce2bde"><strong>testsuite/tests/pmcheck/should_compile/TooManyDeltas.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">TooManyDeltas.hs:1<span class="idiff left right">4</span>:1: warning:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">TooManyDeltas.hs:1<span class="idiff left right">6</span>:1: warning:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> Pattern match checker ran into -fmax-pmcheck-models=0 limit, so</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> • Redundant clauses might not be reported at all</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • Redundant clauses might be reported as inaccessible</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • Patterns reported as unmatched might actually be matched</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> Increase the limit or resolve the warnings to suppress this message.</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">TooManyDeltas.hs:1<span class="idiff left right">4</span>:1: warning: [-Wincomplete-patterns (in -Wextra)]</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">TooManyDeltas.hs:1<span class="idiff left right">6</span>:1: warning: [-Wincomplete-patterns (in -Wextra)]</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> Pattern match(es) are non-exhaustive</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> In an equation for ‘f’:</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> Patterns not matched:</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">@@ -15,17 +15,17 @@ TooManyDeltas.hs:14:1: warning: [-Wincomplete-patterns (in -Wextra)]</td>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> B A</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"> B B</span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext">TooManyDeltas.hs:<span class="idiff left right">19</span>:1: warning:</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">TooManyDeltas.hs:<span class="idiff left right">28</span>:1: warning:</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"> Pattern match checker ran into -fmax-pmcheck-models=0 limit, so</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"> • Redundant clauses might not be reported at all</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"> • Redundant clauses might be reported as inaccessible</span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext"> • Patterns reported as unmatched might actually be matched</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"> Increase the limit or resolve the warnings to suppress this message.</span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext">TooManyDeltas.hs:2<span class="idiff left right">0</span>:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">TooManyDeltas.hs:2<span class="idiff left right">9</span>:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"> Pattern match has inaccessible right hand side</span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"> In an equation for ‘g’: g A A = ...</span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext">TooManyDeltas.hs:<span class="idiff left right">21</span>:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="plaintext"> Pattern match <span class="idiff left right">has inaccessible right hand side</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext">TooManyDeltas.hs:<span class="idiff left right">30</span>:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> Pattern match <span class="idiff left right">is redundant</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"> In an equation for ‘g’: g A A = ...</span></pre>
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