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<h3>
Sebastian Graf pushed to branch wip/pmcheck-ncon
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/b9d1a3c002f97a57e1f9056dd975ea17a82d41ad">b9d1a3c0</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2019-06-16T21:49:03Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More efficient normalisation
</pre>
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<h4>1 changed file:</h4>
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<a href="#bd37d71fa68b0980d832d992b427fd6a6bdb891d">
compiler/deSugar/Check.hs
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<h4>Changes:</h4>
<li id="bd37d71fa68b0980d832d992b427fd6a6bdb891d">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/b9d1a3c002f97a57e1f9056dd975ea17a82d41ad#bd37d71fa68b0980d832d992b427fd6a6bdb891d"><strong>compiler/deSugar/Check.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">@@ -43,7 +43,6 @@ import Util</td>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">FastString</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DataCon</span></span>
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<pre style="margin: 0;">-<span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PatSyn</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">HscTypes</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CompleteMatch</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">BasicTypes</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Boxity</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="59" 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">@@ -60,7 +59,7 @@ import DsUtils (isTrueLHsExpr)</td>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Maybes</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">expectJust</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">find</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">\\</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">find</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">catMaybes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isJust</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">fromMaybe</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">forM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">when</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">guard</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">forM_</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zipWithM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">filterM</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad.Trans.Class</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">lift</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="612" 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="611" 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">@@ -612,65 +611,59 @@ tmTyCsAreSatisfiable</td>
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">term_cs</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC612" class="line" lang="haskell"> <span class="n" style="color: #333;">_unsat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC613" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC615" class="line" lang="haskell"><span class="cd">-- | Tests whether the 'Id' can inhabit the given 'ConLike' in the context</span></span>
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<pre style="margin: 0;">-<span id="LC616" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- expressed by the 'Delta'.</span></span>
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<pre style="margin: 0;">-<span id="LC617" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">InhabitationTest</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;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC618" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC619" class="line" lang="haskell"><span class="cd">-- | An 'InhabitationTest' consulting 'mkOneSatisfiableConFull'. Precise, but</span></span>
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<pre style="margin: 0;">-<span id="LC620" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- expensive.</span></span>
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"><span class="n" style="color: #333;">isConSatisfiable</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InhabitationTest</span></span>
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<pre style="margin: 0;">-<span id="LC622" class="line" lang="haskell"><span class="n" style="color: #333;">isConSatisfiable</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</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="LC623" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"conInhabitsId"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con</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="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC624" class="line" lang="haskell"> <span class="n" style="color: #333;">isJust</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mkOneSatisfiableConFull</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;">-<span id="LC625" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC626" class="line" lang="haskell"><span class="cd">-- | Cheap 'InhabitationTest', always returning @True@.</span></span>
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<pre style="margin: 0;">-<span id="LC627" class="line" lang="haskell"><span class="n" style="color: #333;">cheapInhabitationTest</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InhabitationTest</span></span>
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<pre style="margin: 0;">-<span id="LC628" class="line" lang="haskell"><span class="n" style="color: #333;">cheapInhabitationTest</span> <span class="kr" style="font-weight: 600;">_</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="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC629" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC630" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValAbs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InhabitationTest</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;">ValAbs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Delta</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ValAbs</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC631" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValAbs</span> <span class="n" style="color: #333;">is_con_inh</span> <span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">go_va</span> <span class="n" style="color: #333;">delta</span></span>
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValAbs</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;">ValAbs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Delta</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ValAbs</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC615" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValAbs</span> <span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">go_va</span> <span class="n" style="color: #333;">delta</span></span>
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<pre style="margin: 0;"> <span id="LC616" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC617" class="line" lang="haskell"> <span class="n" style="color: #333;">go_va</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;">ValAbs</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;">PmM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Delta</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ValAbs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC618" class="line" lang="haskell"> <span class="n" style="color: #333;">go_va</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">pm</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">PmCon</span><span class="p">{</span> <span class="n" style="color: #333;">pm_con_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</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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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">delta'</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;">mapAccumLM</span> <span class="n" style="color: #333;">go_va</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"> <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 class="n" style="color: #333;">pm</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_con_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args'</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC637" class="line" lang="haskell"> <span class="n" style="color: #333;">go_va</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">va</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC638" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">pacs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupRefutableAltCons</span> <span class="p">(</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC639" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Even if ncons is empty, we might have a complete match ('Void',</span></span>
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<pre style="margin: 0;">-<span id="LC640" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constraints). Figure out how to the complete matches solely from</span></span>
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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @ty@.</span></span>
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<pre style="margin: 0;">-<span id="LC642" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ncons</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">cl</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="p">[</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pacs</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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<pre style="margin: 0;">-<span id="LC643" class="line" lang="haskell"> <span class="n" style="color: #333;">grps</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">allCompleteMatches</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">is_grp_inh</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterM</span> <span class="p">(</span><span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">is_con_inh</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">(</span><span class="o" style="font-weight: 600;">\\</span> <span class="n" style="color: #333;">ncons</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC645" class="line" lang="haskell"> <span class="n" style="color: #333;">incomplete_grps</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">is_grp_inh</span> <span class="n" style="color: #333;">grps</span></span>
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<pre style="margin: 0;">-<span id="LC646" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If all cons of any COMPLETE set are matched, the ValAbs is vacuous.</span></span>
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<pre style="margin: 0;">-<span id="LC647" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"normaliseValAbs"</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="p">(</span><span class="n" style="color: #333;">idType</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;">ppr</span> <span class="n" style="color: #333;">grps</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">incomplete_grps</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC648" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">notNull</span> <span class="n" style="color: #333;">incomplete_grps</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC649" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If there's a unique singleton incomplete group, turn it into a</span></span>
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @PmCon@ for better readability of warning messages.</span></span>
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<pre style="margin: 0;">-<span id="LC651" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">incomplete_grps</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC652" class="line" lang="haskell"> <span class="p">[[</span><span class="n" style="color: #333;">con</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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<pre style="margin: 0;">-<span id="LC653" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't want to simplify to a @PmCon@ (which won't normalise</span></span>
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<pre style="margin: 0;">-<span id="LC654" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- any further) when @p@ is just the 'cheapInhabitationTest'.</span></span>
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<pre style="margin: 0;">-<span id="LC655" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Thus, we have to assert satisfiability here, even if the</span></span>
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<pre style="margin: 0;">-<span id="LC656" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expensive 'isConSatisfiable' already did so. Also, we have to</span></span>
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<pre style="margin: 0;">-<span id="LC657" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- store the constraints in @delta@.</span></span>
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<pre style="margin: 0;">-<span id="LC658" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">ic</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="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkOneSatisfiableConFull</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;">-<span id="LC659" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"normaliseValAbs2"</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="p">(</span><span class="n" style="color: #333;">idType</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;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ic_val_abs</span> <span class="n" style="color: #333;">ic</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC660" class="line" lang="haskell"> <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 class="n" style="color: #333;">ic_val_abs</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC661" 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="p">(</span><span class="n" style="color: #333;">delta</span><span class="p">,</span> <span class="n" style="color: #333;">va</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"> <span class="n" style="color: #333;">go_va</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">va</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmVar</span> <span class="n" style="color: #333;">x</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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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"> <span class="n" style="color: #333;">grps</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">allCompleteMatches</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"> <span class="n" style="color: #333;">incomplete_grps</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">go_grp</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="n" style="color: #333;">grps</span></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If all cons of any COMPLETE set are matched, the ValAbs is vacuous.</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"normaliseValAbs"</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="p">(</span><span class="n" style="color: #333;">idType</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;">ppr</span> <span class="n" style="color: #333;">grps</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">incomplete_grps</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">notNull</span> <span class="n" style="color: #333;">incomplete_grps</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If there's a unique singleton incomplete group, turn it into a</span></span>
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @PmCon@ for better readability of warning messages.</span></span>
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">incomplete_grps</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"> <span class="p">[[</span><span class="n" style="color: #333;">con</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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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't want to simplify to a @PmCon@ (which won't normalise</span></span>
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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- any further) when @p@ is just the 'cheapInhabitationTest'.</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Thus, we have to assert satisfiability here, even if the</span></span>
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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expensive 'isConSatisfiable' already did so. Also, we have to</span></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- store the constraints in @delta@.</span></span>
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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">ic</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="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkOneSatisfiableConFull</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;">+<span id="LC637" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"normaliseValAbs2"</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="p">(</span><span class="n" style="color: #333;">idType</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;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ic_val_abs</span> <span class="n" style="color: #333;">ic</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC638" class="line" lang="haskell"> <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 class="n" style="color: #333;">ic_val_abs</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC639" 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="p">(</span><span class="n" style="color: #333;">delta</span><span class="p">,</span> <span class="n" style="color: #333;">va</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"> <span class="n" style="color: #333;">go_va</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">va</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 class="n" style="color: #333;">va</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"> <span class="n" style="color: #333;">go_grp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</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;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</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;">PmM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"> <span class="n" style="color: #333;">go_grp</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"> <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="LC645" class="line" lang="haskell"> <span class="n" style="color: #333;">go_grp</span> <span class="n" style="color: #333;">n_inh</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">group</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n_inh</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't attempt to reduce the group any further when there is more than</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- one inhabitant! There's nothing to gain from this information.</span></span>
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For huge groups, this saves a lot of unnecessary oracle queries!</span></span>
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">group</span></span>
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"> <span class="n" style="color: #333;">go_grp</span> <span class="n" style="color: #333;">n_inh</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">delta</span> <span class="p">(</span><span class="n" style="color: #333;">con</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">group</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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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_delta_ic</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">mkOneSatisfiableConFull</span> <span class="n" style="color: #333;">delta</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="LC653" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_delta_ic</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC654" 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;">go_grp</span> <span class="n" style="color: #333;">n_inh</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">group</span></span>
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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">con</span><span class="o" style="font-weight: 600;">:</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">go_grp</span> <span class="p">(</span><span class="n" style="color: #333;">n_inh</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">group</span></span>
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC657" class="line" lang="haskell"><span class="cd">-- | Something that normalises a 'ValVec' by consulting the given</span></span>
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<pre style="margin: 0;"> <span id="LC658" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'InhabitationTest' to weed out vacuous 'ValAbs'.</span></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also 'normaliseValVecHead' and 'normaliseValVec'.</span></span>
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<pre style="margin: 0;">-<span id="LC667" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">ValVecNormaliser</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">InhabitationTest</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmM</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;">ValVec</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">ValVecNormaliser</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmM</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;">ValVec</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC661" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC662" class="line" lang="haskell"><span class="cd">-- | A 'ValVecNormaliser' that normalises all components of a 'ValVec'. This is</span></span>
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the 'ValVecNormaliser' to choose once at the end.</span></span>
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValVec</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ValVecNormaliser</span></span>
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<pre style="margin: 0;">-<span id="LC672" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValVec</span> <span class="n" style="color: #333;"><span class="idiff left">test</span></span><span class="idiff right"> </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="n" style="color: #333;">vva</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC673" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">vva'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapAccumLM</span> <span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">.</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">normaliseValAbs</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">test</span></span><span class="p">)</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">vva</span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValVec</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="n" style="color: #333;">vva</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">vva'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapAccumLM</span> <span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">.</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">normaliseValAbs</span><span class="p">)</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">vva</span></span>
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<pre style="margin: 0;"> <span id="LC667" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="n" style="color: #333;">vva'</span> <span class="n" style="color: #333;">delta'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC668" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC669" class="line" lang="haskell"><span class="cd">-- | A 'ValVecNormaliser' that only tries to normalise the head of each</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">@@ -679,26 +672,23 @@ normaliseValVec test (ValVec vva delta) = runMaybeT $ do</td>
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<pre style="margin: 0;"> <span id="LC672" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Of course we could 'normaliseValVec' instead, but that's unnecessarily</span></span>
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<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- expensive.</span></span>
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<pre style="margin: 0;"> <span id="LC674" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValVecHead</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ValVecNormaliser</span></span>
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<pre style="margin: 0;">-<span id="LC682" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValVecHead</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vva</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">ValVec</span></span><span class="idiff"> </span><span class="kt" style="color: #458; 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="p"><span class="idiff">)</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vva</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValVecHead</span> <span class="n" style="color: #333;"><span class="idiff left">test</span></span><span class="idiff right"> </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="p">(</span><span class="n" style="color: #333;">va</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">vva</span><span class="p">)</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</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="LC684" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">va'</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="p">(</span><span class="n" style="color: #333;">normaliseValAbs</span> <span class="n" style="color: #333;"><span class="idiff left">test</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">va</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC675" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValVecHead</span> <span class="n" style="color: #333;"><span class="idiff left">vva</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">ValVec</span></span><span class="idiff"> </span><span class="kt" style="color: #458; 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="p"><span class="idiff right">)</span></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;">vva</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseValVecHead</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="p">(</span><span class="n" style="color: #333;">va</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">vva</span><span class="p">)</span> <span class="n" style="color: #333;">delta</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</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="LC677" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">va'</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="p">(</span><span class="n" style="color: #333;">normaliseValAbs</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">va</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC678" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="p">(</span><span class="n" style="color: #333;">va'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">vva</span><span class="p">)</span> <span class="n" style="color: #333;">delta'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC679" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC680" class="line" lang="haskell"><span class="cd">-- | This weeds out 'ValVec's with 'PmVar's where at least one COMPLETE set is</span></span>
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- rendered vacuous by equality constraints, by calling out the given</span></span>
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<pre style="margin: 0;">-<span id="LC689" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'ValVecNormaliser'<span class="idiff left right"> with different 'InhabitationTest's</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'ValVecNormaliser'.</span></span>
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<pre style="margin: 0;"> <span id="LC683" 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="LC684" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is quite costly due to the many oracle queries, so we only call this at</span></span>
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the last possible moment. I.e., with 'normaliseValVecHead' when leaving a</span></span>
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<pre style="margin: 0;"> <span id="LC686" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- pattern guard and with 'normaliseValVec' on the final uncovered set.</span></span>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseUncovered</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ValVecNormaliser</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Uncovered</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmM</span> <span class="kt" style="color: #458; font-weight: 600;">Uncovered</span></span>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseUncovered</span> <span class="n" style="color: #333;">normalise_val_vec</span> <span class="n" style="color: #333;">us</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="LC696" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We'll first do a cheap sweep without consulting the oracles</span></span>
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="haskell"> <span class="n" style="color: #333;">us1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapMaybeM</span> <span class="p">(</span><span class="n" style="color: #333;">normalise_val_vec</span> <span class="n" style="color: #333;">cheapInhabitationTest</span><span class="p">)</span> <span class="n" style="color: #333;">us</span></span>
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<pre style="margin: 0;">-<span id="LC698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then we'll do another pass trying to weed out the rest with (in)equalities</span></span>
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<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell"> <span class="n" style="color: #333;">us2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapMaybeM</span> <span class="p">(</span><span class="n" style="color: #333;">normalise_val_vec</span> <span class="n" style="color: #333;">isConSatisfiable</span><span class="p">)</span> <span class="n" style="color: #333;">us1</span></span>
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<pre style="margin: 0;">-<span id="LC700" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"normaliseUncovered"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">us2</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC701" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">us2</span></span>
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell"> <span class="n" style="color: #333;">us'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapMaybeM</span> <span class="n" style="color: #333;">normalise_val_vec</span> <span class="n" style="color: #333;">us</span></span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"normaliseUncovered"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">us'</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">us'</span></span>
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="haskell"><span class="cd">-- | Implements two performance optimizations, as described in the</span></span>
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- \"Strict argument type constraints\" section of</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">@@ -1077,7 +1067,7 @@ translatePat fam_insts pat = case pat of</td>
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<pre style="margin: 0;"> <span id="LC1067" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ex_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ps</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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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">conLikeResTy</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">arg_tys</span></span>
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<pre style="margin: 0;">-<span id="LC1080" class="line" lang="haskell"> <span class="n" style="color: #333;">groups</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">allCompleteMatches</span> <span class="n" style="color: #333;"><span class="idiff left">con</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1070" class="line" lang="haskell"> <span class="n" style="color: #333;">groups</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">allCompleteMatches</span> <span class="n" style="color: #333;">ty</span></span>
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1081
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1071
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">groups</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1082
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1072
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkCanFailPmPat</span> <span class="n" style="color: #333;">ty</span></span>
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1083
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1073
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<pre style="margin: 0;"> <span id="LC1073" 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;">do</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">@@ -1841,7 +1831,7 @@ coercePmPat PmFake = [] -- drop the guards</td>
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1841
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1831
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<pre style="margin: 0;"> <span id="LC1831" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'allCompleteMatches' and Note [Single match constructors].</span></span>
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1842
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1832
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<pre style="margin: 0;"> <span id="LC1832" class="line" lang="haskell"><span class="n" style="color: #333;">singleMatchConstructor</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1843
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1833
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<pre style="margin: 0;"> <span id="LC1833" class="line" lang="haskell"><span class="n" style="color: #333;">singleMatchConstructor</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span></span>
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1844
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<pre style="margin: 0;">-<span id="LC1844" class="line" lang="haskell"> <span class="n" style="color: #333;">any</span> <span class="n" style="color: #333;">isSingleton</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">allCompleteMatches</span> <span class="n" style="color: #333;"><span class="idiff left">cl</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">conLikeResTy</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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1834
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<pre style="margin: 0;">+<span id="LC1834" class="line" lang="haskell"> <span class="n" style="color: #333;">any</span> <span class="n" style="color: #333;">isSingleton</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">allCompleteMatches</span> <span class="p">(</span><span class="n" style="color: #333;">conLikeResTy</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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1835
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<pre style="margin: 0;"> <span id="LC1835" class="line" lang="haskell"></span>
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1846
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1836
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<pre style="margin: 0;"> <span id="LC1836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1847
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1837
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<pre style="margin: 0;"> <span id="LC1837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Single match constructors]</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">@@ -1868,39 +1858,35 @@ the single-match property. We currently don't (can't) check this in the</td>
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1868
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1858
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<pre style="margin: 0;"> <span id="LC1858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">translation step. See #15753 for why this yields surprising results.</span></span>
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1869
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1859
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<pre style="margin: 0;"> <span id="LC1859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1870
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1860
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<pre style="margin: 0;"> <span id="LC1860" class="line" lang="haskell"></span>
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1871
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<pre style="margin: 0;">-<span id="LC1871" class="line" lang="haskell"><span class="cd">-- | For a given conlike, finds all the sets of patterns which could</span></span>
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1872
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<pre style="margin: 0;">-<span id="LC1872" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- be relevant to that conlike by consulting the result type.</span></span>
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1861
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<pre style="margin: 0;">+<span id="LC1861" class="line" lang="haskell"><span class="cd">-- | For a given type, finds all the COMPLETE sets of conlikes that inhabit it.</span></span>
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1873
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1862
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<pre style="margin: 0;"> <span id="LC1862" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1874
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1863
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<pre style="margin: 0;"> <span id="LC1863" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- These come from two places.</span></span>
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1875
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1864
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<pre style="margin: 0;"> <span id="LC1864" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 1. From data constructors defined with the result type constructor.</span></span>
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1876
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<pre style="margin: 0;"> <span id="LC1865" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. From `COMPLETE` pragmas which have the same type as the result</span></span>
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1877
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1866
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<pre style="margin: 0;"> <span id="LC1866" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type constructor. Note that we only use `COMPLETE` pragmas</span></span>
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1878
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1867
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<pre style="margin: 0;"> <span id="LC1867" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- *all* of whose pattern types match. See #14135</span></span>
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1879
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<pre style="margin: 0;">-<span id="LC1879" class="line" lang="haskell"><span class="n" style="color: #333;">allCompleteMatches</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">[[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">]]</span></span>
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1880
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<pre style="margin: 0;">-<span id="LC1880" class="line" lang="haskell"><span class="n" style="color: #333;">allCompleteMatches</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1881
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<pre style="margin: 0;">-<span id="LC1881" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fam</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cl</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1882
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<pre style="margin: 0;">-<span id="LC1882" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">-></span></span>
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1883
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<pre style="margin: 0;">-<span id="LC1883" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">map</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="p">(</span><span class="n" style="color: #333;">tyConDataCons</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))]</span></span>
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1884
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<pre style="margin: 0;">-<span id="LC1884" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1885
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<pre style="margin: 0;">-<span id="LC1885" class="line" lang="haskell"> <span class="n" style="color: #333;">pragmas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1886
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<pre style="margin: 0;">-<span id="LC1886" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">dsGetCompleteMatches</span> <span class="n" style="color: #333;">tc</span></span>
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1887
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<pre style="margin: 0;">-<span id="LC1887" 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;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1888
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<pre style="margin: 0;">-<span id="LC1888" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fams</span> <span class="n" style="color: #333;">cm</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">dsLookupConLike</span> <span class="p">(</span><span class="n" style="color: #333;">completeMatchConLikes</span> <span class="n" style="color: #333;">cm</span><span class="p">)</span></span>
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1889
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<pre style="margin: 0;">-<span id="LC1889" class="line" lang="haskell"> <span class="n" style="color: #333;">from_pragma</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">filter</span> <span class="p">(</span><span class="n" style="color: #333;">isValidCompleteMatch</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">fams</span> <span class="n" style="color: #333;">pragmas</span></span>
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1890
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<pre style="margin: 0;">-<span id="LC1890" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_groups</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fam</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">from_pragma</span></span>
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1891
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<pre style="margin: 0;">-<span id="LC1891" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">final_groups</span></span>
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1892
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<pre style="margin: 0;">-<span id="LC1892" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1893
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<pre style="margin: 0;">-<span id="LC1893" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that all the pattern synonym return types in a `COMPLETE`</span></span>
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1894
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<pre style="margin: 0;">-<span id="LC1894" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pragma subsume the type we're matching.</span></span>
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1895
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<pre style="margin: 0;">-<span id="LC1895" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Filtering out non-matching COMPLETE sets]</span></span>
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1896
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<pre style="margin: 0;">-<span id="LC1896" class="line" lang="haskell"> <span class="n" style="color: #333;">isValidCompleteMatch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">]</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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1897
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<pre style="margin: 0;">-<span id="LC1897" class="line" lang="haskell"> <span class="n" style="color: #333;">isValidCompleteMatch</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">go</span></span>
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1898
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<pre style="margin: 0;">-<span id="LC1898" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1899
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<pre style="margin: 0;">-<span id="LC1899" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1900
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<pre style="margin: 0;">-<span id="LC1900" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="n" style="color: #333;">psc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJust</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">tcMatchTy</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">patSynResTy</span></span>
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1901
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<pre style="margin: 0;">-<span id="LC1901" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">patSynSig</span> <span class="n" style="color: #333;">psc</span></span>
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1902
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<pre style="margin: 0;">-<span id="LC1902" class="line" lang="haskell"></span>
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1903
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<pre style="margin: 0;">-<span id="LC1903" class="line" lang="haskell"> <span class="n" style="color: #333;">patSynResTy</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_ty</span></span>
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1868
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<pre style="margin: 0;">+<span id="LC1868" class="line" lang="haskell"><span class="n" style="color: #333;">allCompleteMatches</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">[[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">]]</span></span>
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1869
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<pre style="margin: 0;">+<span id="LC1869" class="line" lang="haskell"><span class="n" style="color: #333;">allCompleteMatches</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1870
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<pre style="margin: 0;">+<span id="LC1870" 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 class="c1" style="color: #998; font-style: italic;">-- NB: We don't know any COMPLETE set, as opposed to [[]]</span></span>
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1871
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<pre style="margin: 0;">+<span id="LC1871" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1872
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<pre style="margin: 0;">+<span id="LC1872" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">mb_rdcs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">tyConDataCons_maybe</span> <span class="n" style="color: #333;">tc</span></span>
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1873
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<pre style="margin: 0;">+<span id="LC1873" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">maybe_to_list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">(</span><span class="o" style="font-weight: 600;">:</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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1874
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<pre style="margin: 0;">+<span id="LC1874" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rdcs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybe_to_list</span> <span class="n" style="color: #333;">mb_rdcs</span></span>
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1875
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<pre style="margin: 0;">+<span id="LC1875" class="line" lang="haskell"> <span class="n" style="color: #333;">pragmas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGetCompleteMatches</span> <span class="n" style="color: #333;">tc</span></span>
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1876
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<pre style="margin: 0;">+<span id="LC1876" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fams</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">dsLookupConLike</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">completeMatchConLikes</span></span>
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1877
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<pre style="margin: 0;">+<span id="LC1877" class="line" lang="haskell"> <span class="n" style="color: #333;">pscs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">fams</span> <span class="n" style="color: #333;">pragmas</span></span>
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1878
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<pre style="margin: 0;">+<span id="LC1878" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">candidates</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rdcs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">pscs</span></span>
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1879
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<pre style="margin: 0;">+<span id="LC1879" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that all the pattern synonym return types in a `COMPLETE`</span></span>
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1880
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<pre style="margin: 0;">+<span id="LC1880" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pragma subsume the type we're matching.</span></span>
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<pre style="margin: 0;">+<span id="LC1881" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Filtering out non-matching COMPLETE sets]</span></span>
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<pre style="margin: 0;">+<span id="LC1882" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Check if we need to do this any longer</span></span>
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1883
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<pre style="margin: 0;">+<span id="LC1883" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">filter</span> <span class="p">(</span><span class="n" style="color: #333;">isValidCompleteMatch</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">candidates</span><span class="p">)</span></span>
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1884
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<pre style="margin: 0;">+<span id="LC1884" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1885
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<pre style="margin: 0;">+<span id="LC1885" class="line" lang="haskell"> <span class="n" style="color: #333;">isValidCompleteMatch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC1886" class="line" lang="haskell"> <span class="n" style="color: #333;">isValidCompleteMatch</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">p</span></span>
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1887
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<pre style="margin: 0;">+<span id="LC1887" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1888" class="line" lang="haskell"> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJust</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">tcMatchTy</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">projResTy</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">conLikeFullSig</span></span>
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<pre style="margin: 0;">+<span id="LC1889" class="line" lang="haskell"> <span class="n" style="color: #333;">projResTy</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_ty</span></span>
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1890
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<pre style="margin: 0;"> <span id="LC1890" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1891" 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="LC1892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Filtering out non-matching COMPLETE sets]</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">@@ -2436,7 +2422,7 @@ mkUnmatched x nalt (ValVec vva delta) =</td>
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<pre style="margin: 0;"> <span id="LC2422" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- otherwise</span></span>
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2437
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2423
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<pre style="margin: 0;"> <span id="LC2423" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * hide redundant pattern match warnings</span></span>
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2438
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2424
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<pre style="margin: 0;"> <span id="LC2424" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * turn redundant pattern match warnings into inaccessible RHS</span></span>
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2439
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<pre style="margin: 0;">-<span id="LC2439" 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;">normaliseValAbs</span> <span class="n" style="color: #333;"><span class="idiff left">isConSatisfiable</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">{</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tms</span><span class="p">})</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2425" 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;">normaliseValAbs</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">{</span><span class="n" style="color: #333;">delta_tm_cs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tms</span><span class="p">})</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmVar</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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2440
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2426
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<pre style="margin: 0;"> <span id="LC2426" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">res</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2441
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2427
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<pre style="margin: 0;"> <span id="LC2427" 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="n" style="color: #333;">mempty</span></span>
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2442
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2428
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<pre style="margin: 0;"> <span id="LC2428" 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;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">va'</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="n" style="color: #333;">usimple</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ValVec</span> <span class="p">(</span><span class="n" style="color: #333;">va'</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">vva</span><span class="p">)</span> <span class="n" style="color: #333;">delta'</span><span class="p">])</span></span>
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