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<h3>
Richard Eisenberg pushed to branch wip/cfuneqcan-refactor
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c65dc7261c1ccef93fd3e54fb2d84282f3225dbd">c65dc726</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-04T22:45:26-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify getNoGivenEqs
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<h4>1 changed file:</h4>
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<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<h4>Changes:</h4>
<li id="0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c65dc7261c1ccef93fd3e54fb2d84282f3225dbd#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2055,9 +2055,34 @@ getNoGivenEqs :: TcLevel -- TcLevel of this implication</td>
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<pre style="margin: 0;"> <span id="LC2055" class="line" lang="haskell"><span class="n" style="color: #333;">getNoGivenEqs</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">skol_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC2056" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">inerts</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ieqs</span><span class="p">,</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">funeqs</span><span class="p">,</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irreds</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC2057" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInertCans</span></span>
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<pre style="margin: 0;">-<span id="LC2058" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">has_given_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</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;">ct_given_here</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">irreds</span></span>
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<pre style="margin: 0;">-<span id="LC2059" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">anyDVarEnv</span> <span class="n" style="color: #333;">tv_eqs_given_here</span> <span class="n" style="color: #333;">ieqs</span></span>
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<pre style="margin: 0;">-<span id="LC2060" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">anyFunEqMap</span> <span class="n" style="color: #333;">funeqs</span> <span class="n" style="color: #333;">fun_eqs_given_here</span></span>
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<pre style="margin: 0;">+<span id="LC2058" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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<pre style="margin: 0;">+<span id="LC2059" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">is_local_given_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;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC2060" class="line" lang="haskell"> <span class="n" style="color: #333;">is_local_given_ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_given_here</span> <span class="o" style="font-weight: 600;"><&&></span> <span class="n" style="color: #333;">ct_mentions_outer_var</span></span>
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<pre style="margin: 0;">+<span id="LC2061" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2062" class="line" lang="haskell"> <span class="n" style="color: #333;">is_local_given_equal_ct_list</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</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="LC2063" class="line" lang="haskell"> <span class="n" style="color: #333;">is_local_given_equal_ct_list</span> <span class="p">[</span><span class="n" style="color: #333;">ct</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">is_local_given_ct</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">+<span id="LC2064" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Givens are always singletons in an EqualCtList</span></span>
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<pre style="margin: 0;">+<span id="LC2065" class="line" lang="haskell"> <span class="n" style="color: #333;">is_local_given_equal_ct_list</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;">False</span></span>
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<pre style="margin: 0;">+<span id="LC2066" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2067" class="line" lang="haskell"> <span class="n" style="color: #333;">ct_given_here</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;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC2068" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True for a Given bound by the current implication,</span></span>
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<pre style="margin: 0;">+<span id="LC2069" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- i.e. the current level</span></span>
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<pre style="margin: 0;">+<span id="LC2070" class="line" lang="haskell"> <span class="n" style="color: #333;">ct_given_here</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isGiven</span> <span class="n" style="color: #333;">ev</span></span>
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2071
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<pre style="margin: 0;">+<span id="LC2071" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">tclvl</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">ctLocLevel</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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2072
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<pre style="margin: 0;">+<span id="LC2072" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2073
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<pre style="margin: 0;">+<span id="LC2073" class="line" lang="haskell"> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span></span>
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2074
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<pre style="margin: 0;">+<span id="LC2074" class="line" lang="haskell"></span>
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2075
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<pre style="margin: 0;">+<span id="LC2075" class="line" lang="haskell"> <span class="n" style="color: #333;">ct_mentions_outer_var</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;">Bool</span></span>
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2076
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<pre style="margin: 0;">+<span id="LC2076" class="line" lang="haskell"> <span class="n" style="color: #333;">ct_mentions_outer_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">anyFreeVarsOfType</span> <span class="n" style="color: #333;">is_outer_var</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ctPred</span></span>
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2077
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<pre style="margin: 0;">+<span id="LC2077" class="line" lang="haskell"></span>
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2078
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<pre style="margin: 0;">+<span id="LC2078" class="line" lang="haskell"> <span class="n" style="color: #333;">is_outer_var</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</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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2079
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<pre style="margin: 0;">+<span id="LC2079" class="line" lang="haskell"> <span class="n" style="color: #333;">is_outer_var</span> <span class="n" style="color: #333;">tv</span></span>
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2080
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<pre style="margin: 0;">+<span id="LC2080" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="p">`</span><span class="n" style="color: #333;">strictlyDeeperThan</span><span class="p">`</span> <span class="n" style="color: #333;">tcTyVarLevel</span> <span class="n" style="color: #333;">tv</span></span>
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2081
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<pre style="margin: 0;">+<span id="LC2081" 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="kt" style="color: #458; font-weight: 600;">False</span></span>
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2082
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<pre style="margin: 0;">+<span id="LC2082" class="line" lang="haskell"></span>
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2083
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<pre style="margin: 0;">+<span id="LC2083" class="line" lang="haskell"> <span class="n" style="color: #333;">has_given_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">anyBag</span> <span class="n" style="color: #333;">is_local_given_ct</span> <span class="n" style="color: #333;">irreds</span></span>
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2084
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<pre style="margin: 0;">+<span id="LC2084" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">anyDVarEnv</span> <span class="n" style="color: #333;">is_local_given_equal_ct_list</span> <span class="n" style="color: #333;">ieqs</span></span>
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2085
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<pre style="margin: 0;">+<span id="LC2085" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">anyFunEqMap</span> <span class="n" style="color: #333;">funeqs</span> <span class="n" style="color: #333;">is_local_given_equal_ct_list</span></span>
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2061
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2086
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<pre style="margin: 0;"> <span id="LC2086" class="line" lang="haskell"> <span class="n" style="color: #333;">insols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterBag</span> <span class="n" style="color: #333;">insolubleEqCt</span> <span class="n" style="color: #333;">irreds</span></span>
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2062
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2087
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<pre style="margin: 0;"> <span id="LC2087" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Specifically includes ones that originated in some</span></span>
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2088
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<pre style="margin: 0;"> <span id="LC2088" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- outer context but were refined to an insoluble by</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">@@ -2070,30 +2095,6 @@ getNoGivenEqs tclvl skol_tvs</td>
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2095
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<pre style="margin: 0;"> <span id="LC2095" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Inerts:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inerts</span></span>
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2096
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<pre style="margin: 0;"> <span id="LC2096" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Insols:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">insols</span><span class="p">]</span></span>
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2072
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2097
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<pre style="margin: 0;"> <span id="LC2097" 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;">not</span> <span class="n" style="color: #333;">has_given_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">insols</span><span class="p">)</span> <span class="p">}</span></span>
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2073
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<pre style="margin: 0;">-<span id="LC2073" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2074
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<pre style="margin: 0;">-<span id="LC2074" class="line" lang="haskell"> <span class="n" style="color: #333;">tv_eqs_given_here</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</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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2075
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<pre style="margin: 0;">-<span id="LC2075" class="line" lang="haskell"> <span class="n" style="color: #333;">tv_eqs_given_here</span> <span class="p">[</span><span class="n" style="color: #333;">ct</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="p">})]</span></span>
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2076
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<pre style="margin: 0;">-<span id="LC2076" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Givens are always a singleton</span></span>
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2077
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<td class="diff-line-num new_line old" data-linenumber="2098" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2077" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">skolem_bound_here</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">ct_given_here</span> <span class="n" style="color: #333;">ct</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2078" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2078
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<td class="diff-line-num new_line old" data-linenumber="2098" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2078" class="line" lang="haskell"> <span class="n" style="color: #333;">tv_eqs_given_here</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;">False</span></span>
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2079
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<pre style="margin: 0;">-<span id="LC2079" class="line" lang="haskell"></span>
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2080
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<pre style="margin: 0;">-<span id="LC2080" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_eqs_given_here</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</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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2081
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<pre style="margin: 0;">-<span id="LC2081" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_eqs_given_here</span> <span class="p">[</span><span class="n" style="color: #333;">ct</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_given_here</span> <span class="n" style="color: #333;">ct</span></span>
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2082
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<pre style="margin: 0;">-<span id="LC2082" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_eqs_given_here</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;">False</span></span>
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2083
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<pre style="margin: 0;">-<span id="LC2083" class="line" lang="haskell"></span>
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2084
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<pre style="margin: 0;">-<span id="LC2084" class="line" lang="haskell"> <span class="n" style="color: #333;">ct_given_here</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;">Bool</span></span>
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2085
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<pre style="margin: 0;">-<span id="LC2085" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True for a Given bound by the current implication,</span></span>
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2086
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<pre style="margin: 0;">-<span id="LC2086" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- i.e. the current level</span></span>
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2087
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<pre style="margin: 0;">-<span id="LC2087" class="line" lang="haskell"> <span class="n" style="color: #333;">ct_given_here</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isGiven</span> <span class="n" style="color: #333;">ev</span></span>
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2088
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<pre style="margin: 0;">-<span id="LC2088" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">tclvl</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">ctLocLevel</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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2089
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<pre style="margin: 0;">-<span id="LC2089" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2090
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<pre style="margin: 0;">-<span id="LC2090" class="line" lang="haskell"> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span></span>
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2091
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<pre style="margin: 0;">-<span id="LC2091" class="line" lang="haskell"></span>
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2092
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<pre style="margin: 0;">-<span id="LC2092" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_tv_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">skol_tvs</span></span>
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<pre style="margin: 0;">-<span id="LC2093" class="line" lang="haskell"> <span class="n" style="color: #333;">skolem_bound_here</span> <span class="n" style="color: #333;">tv</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Let-bound skolems]</span></span>
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<pre style="margin: 0;">-<span id="LC2094" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcTyVarDetails</span> <span class="n" style="color: #333;">tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2095
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<pre style="margin: 0;">-<span id="LC2095" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">skol_tv_set</span></span>
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2096
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<pre style="margin: 0;">-<span id="LC2096" class="line" lang="haskell"> <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;">False</span></span>
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2098
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<pre style="margin: 0;"> <span id="LC2098" class="line" lang="haskell"></span>
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2099
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<pre style="margin: 0;"> <span id="LC2099" class="line" lang="haskell"><span class="cd">-- | Returns Given constraints that might,</span></span>
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<pre style="margin: 0;"> <span id="LC2100" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- potentially, match the given pred. This is used when checking to see if a</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">@@ -2248,6 +2249,8 @@ are some wrinkles:</td>
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<pre style="margin: 0;"> <span id="LC2249" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Let-bound skolems]</span></span>
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<pre style="margin: 0;"> <span id="LC2251" 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="LC2252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"RAE": Update note.</span></span>
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<pre style="margin: 0;">+<span id="LC2253" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If * the inert set contains a canonical Given CEqCan (a ~ ty)</span></span>
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<pre style="margin: 0;"> <span id="LC2255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and * 'a' is a skolem bound in this very implication,</span></span>
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<pre style="margin: 0;"> <span id="LC2256" class="line" lang="haskell"></span>
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