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<h3>
Simon Jakobi pushed to branch wip/sjakobi/nondetfolds
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb7a7b79d5001f351668afb24397554e85583a99">eb7a7b79</a></strong>
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<span>by Simon Jakobi</span>
<i>at 2020-03-31T04:08:00+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add and use evBindMapToVarSet
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<h4>3 changed files:</h4>
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<a href="#266bc13b57ed8c43a461b6d9a429c917879e16b4">
compiler/GHC/Types/Unique/DFM.hs
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<a href="#89165943f253c43100bca06548eba40ff0519ca5">
compiler/typecheck/TcEvidence.hs
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<a href="#75d517f701402b106e4d98d255eb24b57ba72aab">
compiler/typecheck/TcSimplify.hs
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<h4>Changes:</h4>
<li id="266bc13b57ed8c43a461b6d9a429c917879e16b4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb7a7b79d5001f351668afb24397554e85583a99#266bc13b57ed8c43a461b6d9a429c917879e16b4"><strong>compiler/GHC/Types/Unique/DFM.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">@@ -359,7 +359,7 @@ delListFromUDFM = foldl' delFromUDFM</td>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell"><span class="cd">-- | This allows for lossy conversion from UniqDFM to UniqFM</span></span>
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="haskell"><span class="n" style="color: #333;">udfmToUfm</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UniqDFM</span> <span class="n" style="color: #333;">elt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UniqFM</span> <span class="n" style="color: #333;">elt</span></span>
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell"><span class="n" style="color: #333;">udfmToUfm</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UDFM</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">_i</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="haskell"> <span class="n" style="color: #333;">listToUFM_Directly</span> <span class="p">[(</span><span class="n" style="color: #333;">getUnique</span> <span class="n" style="color: #333;">k</span><span class="p">,</span> <span class="n" style="color: #333;">taggedFst</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">k</span><span class="p">,</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">M</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">toList</span> <span class="n" style="color: #333;">m</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"> <span class="n" style="color: #333;">listToUFM_Directly</span> <span class="p">[(</span><span class="n" style="color: #333;">getUnique</span> <span class="n" style="color: #333;">k</span><span class="p">,</span> <span class="n" style="color: #333;">taggedFst</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">k</span><span class="p">,</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">M</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">toList</span> <span class="n" style="color: #333;">m</span><span class="p">]</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- TODO</span></span></span>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"><span class="n" style="color: #333;">listToUDFM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Uniquable</span> <span class="n" style="color: #333;">key</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">[(</span><span class="n" style="color: #333;">key</span><span class="p">,</span><span class="n" style="color: #333;">elt</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UniqDFM</span> <span class="n" style="color: #333;">elt</span></span>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"><span class="n" style="color: #333;">listToUDFM</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl'</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">k</span><span class="p">,</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addToUDFM</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="n" style="color: #333;">emptyUDFM</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb7a7b79d5001f351668afb24397554e85583a99#89165943f253c43100bca06548eba40ff0519ca5"><strong>compiler/typecheck/TcEvidence.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">@@ -19,6 +19,7 @@ module TcEvidence (</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">foldEvBindMap</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nonDetStrictFoldEvBindMap</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">filterEvBindMap</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isEmptyEvBindMap</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">evBindMapToVarSet</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">EvBind</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;">emptyTcEvBinds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEmptyTcEvBinds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkGivenEvBind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWantedEvBind</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">evBindVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCoEvBindsVar</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -57,6 +58,8 @@ module TcEvidence (</td>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"></span>
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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;">GhcPrelude</span></span>
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60
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.DFM</span></span>
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62
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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;">GHC.Types.Unique.FM</span></span>
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63
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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;">GHC.Types.Var</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;">GHC.Core.Coercion.Axiom</span></span>
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65
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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;">GHC.Core.Coercion</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">@@ -505,6 +508,9 @@ filterEvBindMap :: (EvBind -> Bool) -> EvBindMap -> EvBindMap</td>
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505
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508
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"><span class="n" style="color: #333;">filterEvBindMap</span> <span class="n" style="color: #333;">k</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvBindMap</span> <span class="p">{</span> <span class="n" style="color: #333;">ev_bind_varenv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">})</span></span>
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506
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509
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EvBindMap</span> <span class="p">{</span> <span class="n" style="color: #333;">ev_bind_varenv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterDVarEnv</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">env</span> <span class="p">}</span></span>
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507
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510
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell"></span>
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511
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="haskell"><span class="n" style="color: #333;">evBindMapToVarSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EvBindMap</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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512
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="haskell"><span class="n" style="color: #333;">evBindMapToVarSet</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvBindMap</span> <span class="n" style="color: #333;">dve</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafeUFMToUniqSet</span> <span class="p">(</span><span class="n" style="color: #333;">mapUFM</span> <span class="n" style="color: #333;">evBindVar</span> <span class="p">(</span><span class="n" style="color: #333;">udfmToUfm</span> <span class="n" style="color: #333;">dve</span><span class="p">))</span></span>
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513
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell"></span>
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508
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514
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<pre style="margin: 0;"> <span id="LC514" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">EvBindMap</span> <span class="kr" style="font-weight: 600;">where</span></span>
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509
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<pre style="margin: 0;"> <span id="LC515" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvBindMap</span> <span class="n" style="color: #333;">m</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;">m</span></span>
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516
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<pre style="margin: 0;"> <span id="LC516" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb7a7b79d5001f351668afb24397554e85583a99#75d517f701402b106e4d98d255eb24b57ba72aab"><strong>compiler/typecheck/TcSimplify.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">@@ -2381,7 +2381,7 @@ floatEqualities skols given_ids ev_binds_var no_given_eqs</td>
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2381
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2381
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<pre style="margin: 0;"> <span id="LC2381" class="line" lang="haskell"> <span class="n" style="color: #333;">seed_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">skols</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span></span>
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2382
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<pre style="margin: 0;"> <span id="LC2382" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">given_ids</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span></span>
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2383
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2383
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<pre style="margin: 0;"> <span id="LC2383" class="line" lang="haskell"> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add_non_flt_ct</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">no_float_cts</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span></span>
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<pre style="margin: 0;">-<span id="LC2384" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">foldEvBindMap</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">add_one_bind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">emptyVarSet</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binds</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- TODO</span></span></span>
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<pre style="margin: 0;">+<span id="LC2384" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">evBindMapToVarSet</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">binds</span></span></span>
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<pre style="margin: 0;"> <span id="LC2385" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- seed_skols: See Note [What prevents a constraint from floating] (1,2,3)</span></span>
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<pre style="margin: 0;"> <span id="LC2386" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Include the EvIds of any non-floating constraints</span></span>
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<pre style="margin: 0;"> <span id="LC2387" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2406,9 +2406,6 @@ floatEqualities skols given_ids ev_binds_var no_given_eqs</td>
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<pre style="margin: 0;"> <span id="LC2406" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">flt_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">remaining_simples</span> <span class="p">}</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2407" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2408" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC2409" class="line" lang="haskell"> <span class="n" style="color: #333;">add_one_bind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EvBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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<pre style="margin: 0;">-<span id="LC2410" class="line" lang="haskell"> <span class="n" style="color: #333;">add_one_bind</span> <span class="n" style="color: #333;">bind</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarSet</span> <span class="n" style="color: #333;">acc</span> <span class="p">(</span><span class="n" style="color: #333;">evBindVar</span> <span class="n" style="color: #333;">bind</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2411" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2409" class="line" lang="haskell"> <span class="n" style="color: #333;">add_non_flt_ct</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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<pre style="margin: 0;"> <span id="LC2410" class="line" lang="haskell"> <span class="n" style="color: #333;">add_non_flt_ct</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDerivedCt</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC2411" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarSet</span> <span class="n" style="color: #333;">acc</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvId</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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