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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>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb9c27acd0c6c38d5788169088fa6dc0737c440b">fb9c27ac</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-11-05T15:34:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">test LocalGivenEqs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29a8f7a2f7e5da3074345a54d4b93011d507866c">29a8f7a2</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-11-05T17:30:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update commentary about HasGivenEqs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3557866f4b965ac370a3d5f33bb69a0fe156bcf4">3557866f</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-11-05T18:24:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update notes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a98b07cb7e635ea438cee1895561d5b9d3f6e711">a98b07cb</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-11-07T11:30:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More documentation around LocalGivenEqs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc6d9ef035bcf26483c7eec7fd8d47692f771727">dc6d9ef0</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-11-07T12:33:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename the flat-cache. Document it, too.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/058f4acbdce00694b250beaefa7cf21c3e6a493a">058f4acb</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-11-07T13:16:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make EqualCtList into a newtype with NonEmpty
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e2ec2adab5f5af4756b0769dd8af8eb192700c05">e2ec2ada</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-11-07T13:28:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove Note [No FunEq improvement for Givens]
</pre>
</li>
</ul>
<h4>15 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#2fefe3125c649bc5377b06a7cca18e785855b79c">
compiler/GHC/Data/Bag.hs
</a>
</li>
<li class="file-stats">
<a href="#2e5692f568fd7b67a6b172e2a60469da8392508c">
compiler/GHC/Driver/Flags.hs
</a>
</li>
<li class="file-stats">
<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
</a>
</li>
<li class="file-stats">
<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
compiler/GHC/Tc/Errors.hs
</a>
</li>
<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
</a>
</li>
<li class="file-stats">
<a href="#81707f1fe21087531cefd70879aa09c2be5c1d22">
compiler/GHC/Tc/Solver/Flatten.hs
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<li class="file-stats">
<a href="#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
compiler/GHC/Tc/Solver/Interact.hs
</a>
</li>
<li class="file-stats">
<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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</li>
<li class="file-stats">
<a href="#c69ed1e399ce62d9f23fc51d2806dab1d9b7bfd6">
docs/users_guide/expected-undocumented-flags.txt
</a>
</li>
<li class="file-stats">
<a href="#e72e1315ef8d24f4072dd823e6b645eb886fbe4a">
docs/users_guide/exts/type_families.rst
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</li>
<li class="file-stats">
<a href="#450c4d136f7e999d04363e35060e5ea43ab3aac5">
testsuite/tests/indexed-types/should_fail/T13784.stderr
</a>
</li>
<li class="file-stats">
<a href="#31dd222895d4f077f4769c6b6b7302983c4402e7">
testsuite/tests/patsyn/should_fail/T11010.stderr
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</li>
<li class="file-stats">
<a href="#d5faea44a771b5950df6244ebeb7a33b28089d2b">
<span class="new-file">
+
testsuite/tests/typecheck/should_compile/LocalGivenEqs.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#780007b4b21071a8dbf28e54b71aac4e0f3a4b31">
<span class="new-file">
+
testsuite/tests/typecheck/should_compile/LocalGivenEqs2.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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</li>
</ul>
<h4>Changes:</h4>
<li id="2fefe3125c649bc5377b06a7cca18e785855b79c">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#2fefe3125c649bc5377b06a7cca18e785855b79c"><strong>compiler/GHC/Data/Bag.hs</strong></a>
<hr>
<table class="code white" style="font-family: monospace; font-size: 90%;" bgcolor="#fff" width="100%" cellpadding="0" cellspacing="0">
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="17" 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="17" 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">@@ -17,7 +17,7 @@ module GHC.Data.Bag (</td>
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<td class="diff-line-num old_line" data-linenumber="17" 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">
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">filterBag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">partitionBag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">partitionBagWith</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="18" 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">
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<td class="diff-line-num new_line" data-linenumber="18" 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">
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">concatBag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">catBagMaybes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">foldBag</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="19" 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">
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<td class="diff-line-num new_line" data-linenumber="19" 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">
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isEmptyBag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isSingletonBag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">consBag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">snocBag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">anyBag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">allBag</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="20" 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="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">listToBag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bagToList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAccumBagL</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="20" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">listToBag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">nonEmptyToBag</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">bagToList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAccumBagL</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="21" 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">
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<td class="diff-line-num new_line" data-linenumber="21" 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">
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">concatMapBag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">concatMapBagPair</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapMaybeBag</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="22" 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">
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mapBagM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapBagM_</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="23" 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">
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">flatMapBagM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">flatMapBagPairM</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="35" 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="35" 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">@@ -35,6 +35,7 @@ import Control.Monad</td>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Data</span></span>
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<td class="diff-line-num old_line" data-linenumber="36" 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">
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<pre style="margin: 0;"> <span id="LC36" 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="n" style="color: #333;">mapMaybe</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC37" 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;">partition</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAccumL</span> <span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="38" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC39" 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;">Data.Foldable</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Foldable</span></span>
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40
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">infixr</span> <span class="mi" style="color: #099;">3</span> <span class="p">`</span><span class="n" style="color: #333;">consBag</span><span class="p">`</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -299,6 +300,10 @@ listToBag [] = EmptyBag</td>
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299
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"><span class="n" style="color: #333;">listToBag</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UnitBag</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="haskell"><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">vs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ListBag</span> <span class="n" style="color: #333;">vs</span></span>
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"><span class="n" style="color: #333;">nonEmptyToBag</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"><span class="n" style="color: #333;">nonEmptyToBag</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:|</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;">UnitBag</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="n" style="color: #333;">nonEmptyToBag</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:|</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ListBag</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC307" class="line" lang="haskell"><span class="n" style="color: #333;">bagToList</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC308" class="line" lang="haskell"><span class="n" style="color: #333;">bagToList</span> <span class="n" style="color: #333;">b</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="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;"> <span id="LC309" class="line" lang="haskell"></span>
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<li id="2e5692f568fd7b67a6b172e2a60469da8392508c">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#2e5692f568fd7b67a6b172e2a60469da8392508c"><strong>compiler/GHC/Driver/Flags.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">@@ -260,7 +260,7 @@ data GeneralFlag</td>
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_RPath</span></span>
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_RelativeDynlibPaths</span></span>
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<pre style="margin: 0;"> <span id="LC262" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_Hpc</span></span>
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_F<span class="idiff left right">lat</span>Cache</span></span>
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_F<span class="idiff left right">amApp</span>Cache</span></span>
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<pre style="margin: 0;"> <span id="LC264" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_ExternalInterpreter</span></span>
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_OptimalApplicativeDo</span></span>
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266
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266
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_VersionMacros</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#774d88050336ef660c7a219fb06c480c2fc639bc"><strong>compiler/GHC/Driver/Session.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3404" 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">@@ -3404,7 +3404,7 @@ fFlagsDeps = [</td>
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3404
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3404
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<pre style="margin: 0;"> <span id="LC3404" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"expose-all-unfoldings"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_ExposeAllUnfoldings</span><span class="p">,</span></span>
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3405
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3405
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<pre style="margin: 0;"> <span id="LC3405" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"external-dynamic-refs"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_ExternalDynamicRefs</span><span class="p">,</span></span>
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3406
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3406
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<pre style="margin: 0;"> <span id="LC3406" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"external-interpreter"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_ExternalInterpreter</span><span class="p">,</span></span>
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3407
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<td class="diff-line-num new_line old" data-linenumber="3407" 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="LC3407" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"f<span class="idiff left">lat-cache"</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Opt_Flat</span>Cache</span><span class="p">,</span></span>
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<td class="diff-line-num new old_line" data-linenumber="3408" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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3407
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<pre style="margin: 0;">+<span id="LC3407" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"f<span class="idiff left">amily-application-cache"</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Opt_FamApp</span>Cache</span><span class="p">,</span></span>
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3408
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3408
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<pre style="margin: 0;"> <span id="LC3408" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"float-in"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_FloatIn</span><span class="p">,</span></span>
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3409
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3409
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<pre style="margin: 0;"> <span id="LC3409" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"force-recomp"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_ForceRecomp</span><span class="p">,</span></span>
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3410
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3410
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<pre style="margin: 0;"> <span id="LC3410" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"ignore-optim-changes"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_IgnoreOptimChanges</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3760" 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="3760" 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">@@ -3760,7 +3760,7 @@ defaultFlags settings</td>
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3760
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3760
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<pre style="margin: 0;"> <span id="LC3760" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_AutoLinkPackages</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="3761" 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">
3761
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<td class="diff-line-num new_line" data-linenumber="3761" 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">
3761
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<pre style="margin: 0;"> <span id="LC3761" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Opt_DiagnosticsShowCaret</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="3762" 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">
3762
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3762
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<pre style="margin: 0;"> <span id="LC3762" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Opt_EmbedManifest</span><span class="p">,</span></span>
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<td class="diff-line-num old old_line" data-linenumber="3763" 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">
3763
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<pre style="margin: 0;">-<span id="LC3763" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Opt_F<span class="idiff left right">lat</span>Cache</span><span class="p">,</span></span>
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<td class="diff-line-num new old_line" data-linenumber="3764" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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3763
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<pre style="margin: 0;">+<span id="LC3763" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Opt_F<span class="idiff left right">amApp</span>Cache</span><span class="p">,</span></span>
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3764
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3764
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<pre style="margin: 0;"> <span id="LC3764" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Opt_GenManifest</span><span class="p">,</span></span>
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3765
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3765
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<pre style="margin: 0;"> <span id="LC3765" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Opt_GhciHistory</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="3766" 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">
3766
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3766
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<pre style="margin: 0;"> <span id="LC3766" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Opt_GhciSandbox</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="5100" 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="5100" 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">@@ -5100,4 +5100,3 @@ initSDocContext dflags style = SDC</td>
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5100
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5100
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<pre style="margin: 0;"> <span id="LC5100" class="line" lang="haskell"><span class="cd">-- | Initialize the pretty-printing options using the default user style</span></span>
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<td class="diff-line-num old_line" data-linenumber="5101" 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">
5101
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5101
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<pre style="margin: 0;"> <span id="LC5101" class="line" lang="haskell"><span class="n" style="color: #333;">initDefaultSDocContext</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDocContext</span></span>
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5102
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5102
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<pre style="margin: 0;"> <span id="LC5102" class="line" lang="haskell"><span class="n" style="color: #333;">initDefaultSDocContext</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initSDocContext</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">defaultUserStyle</span></span></pre>
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5103
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<pre style="margin: 0;">-<span id="LC5103" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76"><strong>compiler/GHC/Tc/Errors.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">@@ -1688,7 +1688,10 @@ When reporting that GHC can't solve (a ~ c), there are two givens in scope:</td>
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1688
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1688
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<pre style="margin: 0;"> <span id="LC1688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">redundant), so it's not terribly useful to report it in an error message.</span></span>
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1689
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1689
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<pre style="margin: 0;"> <span id="LC1689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To accomplish this, we discard any Implications that do not bind any</span></span>
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1690
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1690
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<pre style="margin: 0;"> <span id="LC1690" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equalities by filtering the `givens` selected in `misMatchOrCND` (based on</span></span>
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1691
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<pre style="margin: 0;">-<span id="LC1691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the `ic_given_eqs` field of the Implication).</span></span>
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1691
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<pre style="margin: 0;">+<span id="LC1691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the `ic_given_eqs` field of the Implication). Note that we discard givens</span></span>
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1692
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<pre style="margin: 0;">+<span id="LC1692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that have no equalities whatsoever, but we want to keep ones with only *local*</span></span>
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1693
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<pre style="margin: 0;">+<span id="LC1693" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equalities, as these may be helpful to the user in understanding what went</span></span>
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1694
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<pre style="margin: 0;">+<span id="LC1694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">wrong.</span></span>
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1692
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1695
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<pre style="margin: 0;"> <span id="LC1695" class="line" lang="haskell"></span>
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1693
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<pre style="margin: 0;"> <span id="LC1696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But this is not enough to avoid all redundant givens! Consider this example,</span></span>
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1694
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1697
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<pre style="margin: 0;"> <span id="LC1697" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from #15361:</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1596,7 +1596,7 @@ In this Note, "decomposition" refers to taking the constraint</td>
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1596
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1596
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<pre style="margin: 0;"> <span id="LC1596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where that notation indicates a list of new constraints, where the</span></span>
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1597
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1597
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<pre style="margin: 0;"> <span id="LC1597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">new constraints may have different flavours and different roles.</span></span>
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1598
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1598
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<pre style="margin: 0;"> <span id="LC1598" class="line" lang="haskell"></span>
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1599
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<pre style="margin: 0;">-<span id="LC1599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key property to consider is injectivity. When decomposing a Given the</span></span>
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1599
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<pre style="margin: 0;">+<span id="LC1599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key property to consider is injectivity. When decomposing a Given<span class="idiff left right">,</span> the</span></span>
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1600
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1600
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<pre style="margin: 0;"> <span id="LC1600" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">decomposition is sound if and only if T is injective in all of its type</span></span>
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1601
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1601
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<pre style="margin: 0;"> <span id="LC1601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">arguments. When decomposing a Wanted, the decomposition is sound (assuming the</span></span>
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1602
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1602
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<pre style="margin: 0;"> <span id="LC1602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">correct roles in the produced equality constraints), but it may be a guess --</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">@@ -1614,13 +1614,13 @@ Pursuing the details requires exploring three axes:</td>
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1614
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<pre style="margin: 0;"> <span id="LC1614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Role: Nominal vs. Representational</span></span>
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1615
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<pre style="margin: 0;"> <span id="LC1615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* TyCon species: datatype vs. newtype vs. data family vs. type family vs. type variable</span></span>
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1616
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1616
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<pre style="margin: 0;"> <span id="LC1616" class="line" lang="haskell"></span>
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1617
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<pre style="margin: 0;">-<span id="LC1617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(<span class="idiff left right">So a type variable isn't a TyCon</span>, but it's convenient to put the AppTy case</span></span>
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<pre style="margin: 0;">+<span id="LC1617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(<span class="idiff left right">A type variable isn't a TyCon, of course</span>, but it's convenient to put the AppTy case</span></span>
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1618
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<pre style="margin: 0;"> <span id="LC1618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the same table.)</span></span>
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1619
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<pre style="margin: 0;"> <span id="LC1619" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1620" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Right away, we can say that Derived behaves just as Wanted for the purposes</span></span>
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1621
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<pre style="margin: 0;"> <span id="LC1621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of decomposition. The difference between Derived and Wanted is the handling of</span></span>
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<pre style="margin: 0;"> <span id="LC1622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">evidence. Since decomposition in these cases isn't a matter of soundness but of</span></span>
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<pre style="margin: 0;">-<span id="LC1623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">guessing, we want the same behavior regardless of evidence.</span></span>
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<pre style="margin: 0;">+<span id="LC1623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">guessing, we want the same behavio<span class="idiff left right">u</span>r regardless of evidence.</span></span>
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<pre style="margin: 0;"> <span id="LC1624" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here is a table (discussion following) detailing where decomposition of</span></span>
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1626
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<pre style="margin: 0;"> <span id="LC1626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (T s1 ... sn) ~r (T t1 .. tn)</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">@@ -1634,7 +1634,7 @@ NOMINAL GIVEN WANTED WHERE</td>
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<pre style="margin: 0;"> <span id="LC1634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Datatype YES YES canTyConApp</span></span>
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<pre style="margin: 0;"> <span id="LC1635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Newtype YES YES canTyConApp</span></span>
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<pre style="margin: 0;"> <span id="LC1636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Data family YES YES canTyConApp</span></span>
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<pre style="margin: 0;">-<span id="LC1637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Type family NO{1} YES, in injective args{1} canEq<span class="idiff left right">Fun</span></span></span>
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<pre style="margin: 0;">+<span id="LC1637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Type family NO{1} YES, in injective args{1} canEq<span class="idiff left right">CanLHS2</span></span></span>
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<pre style="margin: 0;"> <span id="LC1638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">AppTy YES YES can_eq_app</span></span>
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<pre style="margin: 0;"> <span id="LC1639" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1640" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">REPRESENTATIONAL GIVEN WANTED</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">@@ -1642,11 +1642,9 @@ REPRESENTATIONAL GIVEN WANTED</td>
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<pre style="margin: 0;"> <span id="LC1642" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Datatype YES YES canTyConApp</span></span>
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<pre style="margin: 0;"> <span id="LC1643" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Newtype NO{2} MAYBE{2} canTyConApp(can_decompose)</span></span>
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<pre style="margin: 0;"> <span id="LC1644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Data family NO{3} MAYBE{3} canTyConApp(can_decompose)</span></span>
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<pre style="margin: 0;">-<span id="LC1645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Type family NO NO canEq<span class="idiff left right">Fun</span></span></span>
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<pre style="margin: 0;">+<span id="LC1645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Type family NO NO canEq<span class="idiff left right">CanLHS2</span></span></span>
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<pre style="margin: 0;"> <span id="LC1646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">AppTy NO{4} NO{4} can_eq_nc'</span></span>
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<pre style="margin: 0;"> <span id="LC1647" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"RAE" update all this; no more canEqFun</span></span>
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<pre style="margin: 0;">-<span id="LC1649" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{1}: Type families can be injective in some, but not all, of their arguments,</span></span>
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<pre style="margin: 0;"> <span id="LC1649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so we want to do partial decomposition. This is quite different than the way</span></span>
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<pre style="margin: 0;"> <span id="LC1650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">other decomposition is done, where the decomposed equalities replace the original</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">@@ -1658,9 +1656,9 @@ decompose an injective-type-family Given.</td>
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<pre style="margin: 0;"> <span id="LC1656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{2}: See Note [Decomposing newtypes at representational role]</span></span>
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<pre style="margin: 0;"> <span id="LC1657" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{3}: Because of the possibility of newtype instances, we must treat</span></span>
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<pre style="margin: 0;">-<span id="LC1661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data families like newtypes. See also<span class="idiff left right"> Note [Decomposing newtypes at</span></span></span>
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<pre style="margin: 0;">-<span id="LC1662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">representational role]. See #10534 and test case</span></span></span>
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<pre style="margin: 0;">-<span id="LC1663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">typecheck/should_fail/T10534.</span></span>
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<pre style="margin: 0;">+<span id="LC1659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data families like newtypes. See also</span></span>
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<pre style="margin: 0;">+<span id="LC1660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Note [Decomposing newtypes at representational role]. See #10534 and</span></span></span>
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<pre style="margin: 0;">+<span id="LC1661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">t<span class="idiff left right">est case t</span>ypecheck/should_fail/T10534.</span></span>
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<pre style="margin: 0;"> <span id="LC1662" class="line" lang="haskell"></span>
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1663
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<pre style="margin: 0;"> <span id="LC1663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{4}: See Note [Decomposing AppTy at representational role]</span></span>
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<pre style="margin: 0;"> <span id="LC1664" 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">@@ -2189,7 +2187,8 @@ canEqCanLHS2 ev eq_rel swapped lhs1 ps_xi1 lhs2 ps_xi2 mco</td>
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<pre style="margin: 0;"> <span id="LC2187" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- ordinary, non-injective type family</span></span>
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<pre style="margin: 0;"> <span id="LC2188" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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2191
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2189
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<pre style="margin: 0;"> <span id="LC2189" class="line" lang="haskell"></span>
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2192
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<pre style="margin: 0;">-<span id="LC2192" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">unifyDerived</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 class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span> <span class="n" style="color: #333;">inj_eqns</span></span>
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<pre style="margin: 0;">+<span id="LC2190" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">isGiven</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2191" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">unifyDerived</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 class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span> <span class="n" style="color: #333;">inj_eqns</span></span>
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2193
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2192
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<pre style="margin: 0;"> <span id="LC2192" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2193" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tclvl</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="LC2194" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<li id="81707f1fe21087531cefd70879aa09c2be5c1d22">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#81707f1fe21087531cefd70879aa09c2be5c1d22"><strong>compiler/GHC/Tc/Solver/Flatten.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">@@ -31,6 +31,7 @@ import GHC.Tc.Solver.Monad as TcS</td>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">zipWith3M</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Arrow</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">first</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC37" 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">@@ -273,11 +274,9 @@ flattenType loc ty</td>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Flattening]</span></span>
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<pre style="margin: 0;"> <span id="LC276" 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="LC276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"RAE": update</span></span>
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<pre style="margin: 0;">-<span id="LC277" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> flatten ty ==> (xi, co)</span></span>
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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<pre style="margin: 0;">-<span id="LC280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> xi has no <span class="idiff left right">type functions, unless they appear under ForAll</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> xi has no <span class="idiff left right">reducible type function</span>s</span></span>
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> has no skolems that are mapped in the inert set</span></span>
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<pre style="margin: 0;"> <span id="LC281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> has no filled-in metavariables</span></span>
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co :: xi ~ ty</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">@@ -287,8 +286,7 @@ Key invariants:</td>
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<pre style="margin: 0;"> <span id="LC286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (F1) tcTypeKind(xi) succeeds and returns a fully zonked kind</span></span>
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (F2) tcTypeKind(xi) `eqType` zonk(tcTypeKind(ty))</span></span>
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<pre style="margin: 0;"> <span id="LC288" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that it is flatten's job to flatten *every type function it sees*.</span></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">flatten is only called on *arguments* to type functions, by canEqGiven.</span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that it is flatten's job to try to reduce *every type function it sees*.</span></span>
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<pre style="margin: 0;"> <span id="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Flattening also:</span></span>
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * zonks, removing any metavariables, and</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">@@ -323,22 +321,12 @@ Recall that in comments we use alpha[flat = ty] to represent a</td>
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<pre style="margin: 0;"> <span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">flattening skolem variable alpha which has been generated to stand in</span></span>
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<pre style="margin: 0;"> <span id="LC322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for ty.</span></span>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">----- Example of flattening a constraint: ------</span></span>
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<pre style="margin: 0;">-<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> flatten (List (F (G Int))) ==> (xi, cc)</span></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where</span></span>
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> xi = List alpha</span></span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> cc = { G Int ~ beta[flat = G Int],</span></span>
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F beta ~ alpha[flat = F beta] }</span></span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here</span></span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * alpha and beta are 'flattening skolem variables'.</span></span>
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<pre style="margin: 0;">-<span id="LC334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * All the constraints in cc are 'given', and all their coercion terms</span></span>
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<pre style="margin: 0;">-<span id="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> are the identity.</span></span>
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<pre style="margin: 0;">-<span id="LC336" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that we prefer to leave type synonyms unexpanded when possible,</span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so when the flattener encounters one, it first asks whether its</span></span>
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<pre style="margin: 0;">-<span id="LC339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">transitive expansion contains any type function applications. If so,</span></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">transitive expansion contains any type function applications or is</span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">forgetful -- that is, omits one or more type variables in its RHS. If so,</span></span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it expands the synonym and proceeds; if not, it simply returns the</span></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unexpanded synonym.</span></span>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unexpanded synonym.<span class="idiff left right"> See also Note [Flattening synonyms].</span></span></span>
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [flatten_args performance]</span></span>
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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">@@ -796,8 +784,8 @@ flatten_exact_fam_app_fully tc tys</td>
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<pre style="margin: 0;"> <span id="LC784" class="line" lang="haskell"> <span class="n" style="color: #333;">ret_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConAppCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">cos</span></span>
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<pre style="margin: 0;"> <span id="LC785" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ret_co :: F xis ~ F tys; might be heterogeneous</span></span>
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<pre style="margin: 0;"> <span id="LC786" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC799" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now, look in the cache</span></span>
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb_ct</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lookupF<span class="idiff left right">latCache</span></span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xis</span></span>
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now, look in the <span class="idiff left right">inerts and the </span>cache</span></span>
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb_ct</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lookupF<span class="idiff left right">amApp</span></span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xis</span></span>
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789
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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790
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<pre style="margin: 0;"> <span id="LC790" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLoc</span></span>
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791
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<pre style="margin: 0;"> <span id="LC791" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_ct</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="871" 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">@@ -883,7 +871,7 @@ flatten_exact_fam_app_fully tc tys</td>
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871
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">flavour</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getFlavour</span></span>
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872
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: only extend cache with nominal, given equalities</span></span>
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873
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<pre style="margin: 0;"> <span id="LC873" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">eq_rel</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">flavour</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Given</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC886" class="line" lang="haskell"> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extendF<span class="idiff left right">lat</span>Cache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extendF<span class="idiff left right">amApp</span>Cache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</span><span class="p">)</span></span>
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875
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">role</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqRelRole</span> <span class="n" style="color: #333;">eq_rel</span></span>
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876
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"> <span class="n" style="color: #333;">xi'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">xi</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">kind_co</span></span>
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877
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<pre style="margin: 0;"> <span id="LC877" class="line" lang="haskell"> <span class="n" style="color: #333;">co'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">update_co</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1027" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1015" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1027,8 +1015,8 @@ flatten_tyvar2 :: TcTyVar -> CtFlavourRole -> FlatM FlattenTvResult</td>
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1027
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_tyvar2</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">fr</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">eq_rel</span><span class="p">)</span></span>
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1028
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ieqs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">getInertEqs</span></span>
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1029
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupDVarEnv</span> <span class="n" style="color: #333;">ieqs</span> <span class="n" style="color: #333;">tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1030
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<pre style="margin: 0;">-<span id="LC1030" 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;"><span class="idiff left">ct</span></span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- If the first doesn't work,</span></span>
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<pre style="margin: 0;">-<span id="LC1031" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the subsequent ones won't either</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">EqualCtList</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:|</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff right">)</span>)</span> <span class="c1" style="color: #998; font-style: italic;">-- If the first doesn't work,</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- the subsequent ones won't either</span></span>
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1032
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev</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>
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1033
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">,</span> <span class="n" style="color: #333;">cc_eq_rel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_eq_rel</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ct</span></span>
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1034
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1022
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ct_fr</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ctev</span><span class="p">,</span> <span class="n" style="color: #333;">ct_eq_rel</span><span class="p">)</span></span>
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<li id="f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e"><strong>compiler/GHC/Tc/Solver/Interact.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">@@ -57,6 +57,7 @@ import GHC.Types.Unique( hasKey )</td>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></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="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="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</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="LC62" 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>
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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;">Control.Monad.Trans.Maybe</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">@@ -1247,11 +1248,9 @@ improveLocalFunEqs :: CtEvidence -> InertCans -> TyCon -> [TcType] -> TcType</td>
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1247
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1248
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<pre style="margin: 0;"> <span id="LC1248" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- E.g. x + y ~ z, x + y' ~ z => [D] y ~ y'</span></span>
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1248
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1249
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<pre style="margin: 0;"> <span id="LC1249" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1249
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1250
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<pre style="margin: 0;"> <span id="LC1250" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [FunDep and implicit parameter reactions]</span></span>
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1250
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<pre style="margin: 0;">-<span id="LC1250" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- No Givens here: Note [No FunEq improvement for Givens]</span></span>
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1251
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1251
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<pre style="margin: 0;"> <span id="LC1251" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: isImprovable work_ev</span></span>
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1252
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<pre style="margin: 0;"> <span id="LC1252" class="line" lang="haskell"><span class="n" style="color: #333;">improveLocalFunEqs</span> <span class="n" style="color: #333;">work_ev</span> <span class="n" style="color: #333;">inerts</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC1253" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isGiven</span> <span class="n" style="color: #333;">work_ev</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1254" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isImprovable</span> <span class="n" style="color: #333;">work_ev</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1253" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isImprovable</span> <span class="n" style="color: #333;">work_ev</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1254" class="line" lang="haskell"> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">improvement_eqns</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1256
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<pre style="margin: 0;"> <span id="LC1255" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"interactFunEq improvements: "</span> <span class="o" style="font-weight: 600;">$</span></span>
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1257
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<pre style="margin: 0;"> <span id="LC1256" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Eqns:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">improvement_eqns</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">@@ -1260,7 +1259,8 @@ improveLocalFunEqs work_ev inerts fam_tc args rhs</td>
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<pre style="margin: 0;"> <span id="LC1259" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitFunDepDeriveds</span> <span class="n" style="color: #333;">improvement_eqns</span> <span class="p">}</span></span>
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1261
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<pre style="margin: 0;"> <span id="LC1260" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1262
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<pre style="margin: 0;"> <span id="LC1261" class="line" lang="haskell"> <span class="n" style="color: #333;">funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">inerts</span></span>
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1263
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<pre style="margin: 0;">-<span id="LC1263" class="line" lang="haskell"> <span class="n" style="color: #333;">funeqs_for_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="n" style="color: #333;">funeq_ct</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">funeq_ct</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findFunEqsByTyCon</span> <span class="n" style="color: #333;">funeqs</span> <span class="n" style="color: #333;">fam_tc</span></span>
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<pre style="margin: 0;">+<span id="LC1262" class="line" lang="haskell"> <span class="n" style="color: #333;">funeqs_for_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="n" style="color: #333;">funeq_ct</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="p">(</span><span class="n" style="color: #333;">funeq_ct</span> <span class="o" style="font-weight: 600;">:|</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1263" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findFunEqsByTyCon</span> <span class="n" style="color: #333;">funeqs</span> <span class="n" style="color: #333;">fam_tc</span></span>
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<pre style="margin: 0;"> <span id="LC1264" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">ctEqRel</span> <span class="n" style="color: #333;">funeq_ct</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1265" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- representational equalities don't interact</span></span>
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<pre style="margin: 0;"> <span id="LC1266" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with type family dependencies</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">@@ -1315,16 +1315,12 @@ improveLocalFunEqs work_ev inerts fam_tc args rhs</td>
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1315
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<pre style="margin: 0;"> <span id="LC1315" class="line" lang="haskell"> <span class="n" style="color: #333;">ctl_depth</span> <span class="n" style="color: #333;">work_loc</span> <span class="p">}</span></span>
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1316
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1316
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<pre style="margin: 0;"> <span id="LC1316" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Type inference for type families with injectivity]</span></span>
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1318
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<pre style="margin: 0;">-<span id="LC1318" 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="LC1319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"RAE": Update this Note.</span></span>
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<pre style="margin: 0;">-<span id="LC1320" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1318" 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="LC1319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we have a type family with an injectivity annotation:</span></span>
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<pre style="margin: 0;"> <span id="LC1320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F a b = r | r -> b</span></span>
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<pre style="margin: 0;"> <span id="LC1321" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then if we have two CFunEqCan constraints for F with the same RHS</span></span>
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<pre style="margin: 0;">-<span id="LC1325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F s1 t1 ~ rhs</span></span>
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<pre style="margin: 0;">-<span id="LC1326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F s2 t2 ~ rhs</span></span>
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<pre style="margin: 0;">-<span id="LC1327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then we can use the injectivity to get a new Derived constraint on</span></span>
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<pre style="margin: 0;">+<span id="LC1322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then if we have an equality like F s1 t1 ~ F s2 t2,</span></span>
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<pre style="margin: 0;">+<span id="LC1323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we can use the injectivity to get a new Derived constraint on</span></span>
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<pre style="margin: 0;"> <span id="LC1324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the injective argument</span></span>
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<pre style="margin: 0;"> <span id="LC1325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [D] t1 ~ t2</span></span>
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<pre style="margin: 0;"> <span id="LC1326" 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">@@ -1351,8 +1347,20 @@ We could go further and offer evidence from decomposing injective type-function</td>
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<pre style="margin: 0;"> <span id="LC1347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applications, but that would require new evidence forms, and an extension to</span></span>
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<pre style="margin: 0;"> <span id="LC1348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">FC, so we don't do that right now (Dec 14).</span></span>
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<pre style="margin: 0;"> <span id="LC1349" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Injective type families] in GHC.Core.TyCon</span></span>
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<pre style="margin: 0;">+<span id="LC1350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We generate these Deriveds in three places, depending on how we notice the</span></span>
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<pre style="margin: 0;">+<span id="LC1351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">injectivity.</span></span>
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<pre style="margin: 0;">+<span id="LC1352" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. When we have a [W/D] F tys1 ~ F tys2. This is handled in canEqCanLHS2, and</span></span>
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<pre style="margin: 0;">+<span id="LC1354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">described in Note [Decomposing equality] in GHC.Tc.Solver.Canonical.</span></span>
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<pre style="margin: 0;">+<span id="LC1355" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. When we have [W] F tys1 ~ T and [W] F tys2 ~ T. Note that neither of these</span></span>
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<pre style="margin: 0;">+<span id="LC1357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraints rewrites the other, as they have different LHSs. This is done</span></span>
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<pre style="margin: 0;">+<span id="LC1358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in improveLocalFunEqs, called during the interactWithInertsStage.</span></span>
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<pre style="margin: 0;">+<span id="LC1359" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. When we have [W] F tys ~ T and an equation for F that looks like F tys' = T.</span></span>
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<pre style="margin: 0;">+<span id="LC1361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is done in improve_top_fun_eqs, called from the top-level reactions stage.</span></span>
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<pre style="margin: 0;"> <span id="LC1362" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Injective type families] in GHC.Core.TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC1364" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Cache-caused loops]</span></span>
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<pre style="margin: 0;"> <span id="LC1366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</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">@@ -1454,22 +1462,19 @@ interactEq tclvl inerts workItem@(CEqCan { cc_lhs = lhs</td>
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<pre style="margin: 0;"> <span id="LC1462" 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;">traceTcS</span> <span class="s" style="color: #d14;">"Not unifying representational equality"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">workItem</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1463" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">workItem</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1464" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1457" class="line" lang="haskell"> <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 class="c1" style="color: #998; font-style: italic;">-- See Note [Touchables and givens]</span></span>
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<pre style="margin: 0;">-<span id="LC1458" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [No FunEq improvement for Givens]</span></span>
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<pre style="margin: 0;">-<span id="LC1459" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">workItem</span></span>
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<pre style="margin: 0;">+<span id="LC1465" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- try improvement, if possible</span></span>
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<pre style="margin: 0;">+<span id="LC1466" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lhs</span></span>
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<pre style="margin: 0;">+<span id="LC1467" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isImprovable</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC1468" 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;">improveLocalFunEqs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">inerts</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC1469" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">workItem</span> <span class="p">}</span></span>
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1460
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1470
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<pre style="margin: 0;"> <span id="LC1470" class="line" lang="haskell"></span>
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1461
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1471
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<pre style="margin: 0;"> <span id="LC1471" class="line" lang="haskell"> <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="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lhs</span></span>
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1472
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<pre style="margin: 0;">+<span id="LC1472" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isGiven</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Touchables and givens]</span></span>
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1462
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1473
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<pre style="margin: 0;"> <span id="LC1473" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">canSolveByUnification</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">rhs</span></span>
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1463
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1474
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<pre style="margin: 0;"> <span id="LC1474" 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;">solveByUnification</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">rhs</span></span>
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1464
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1475
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<pre style="margin: 0;"> <span id="LC1475" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">n_kicked</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">kickOutAfterUnification</span> <span class="n" style="color: #333;">tv</span></span>
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1465
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1476
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<pre style="margin: 0;"> <span id="LC1476" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Stop</span> <span class="n" style="color: #333;">ev</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Solved by unification"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprKicked</span> <span class="n" style="color: #333;">n_kicked</span><span class="p">))</span> <span class="p">}</span></span>
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1466
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1477
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<pre style="margin: 0;"> <span id="LC1477" class="line" lang="haskell"></span>
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1467
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<pre style="margin: 0;">-<span id="LC1467" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- try improvement, if possible</span></span>
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1468
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<pre style="margin: 0;">-<span id="LC1468" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lhs</span></span>
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1469
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<pre style="margin: 0;">-<span id="LC1469" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isImprovable</span> <span class="n" style="color: #333;">ev</span></span>
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1470
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<pre style="margin: 0;">-<span id="LC1470" 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;">improveLocalFunEqs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">inerts</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span> <span class="n" style="color: #333;">rhs</span></span>
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1471
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<pre style="margin: 0;">-<span id="LC1471" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">workItem</span> <span class="p">}</span></span>
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1472
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<pre style="margin: 0;">-<span id="LC1472" class="line" lang="haskell"></span>
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1473
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1478
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<pre style="margin: 0;"> <span id="LC1478" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1479
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<pre style="margin: 0;"> <span id="LC1479" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">workItem</span></span>
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1480
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<pre style="margin: 0;"> <span id="LC1480" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1745" 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">@@ -1740,8 +1745,7 @@ doTopReactEq work_item = doTopReactOther work_item</td>
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1740
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1745
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<pre style="margin: 0;"> <span id="LC1745" class="line" lang="haskell"><span class="n" style="color: #333;">improveTopFunEqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1741
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1746
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<pre style="margin: 0;"> <span id="LC1746" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [FunDep and implicit parameter reactions]</span></span>
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1742
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1747
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<pre style="margin: 0;"> <span id="LC1747" class="line" lang="haskell"><span class="n" style="color: #333;">improveTopFunEqs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC1743" class="line" lang="haskell"> <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 class="c1" style="color: #998; font-style: italic;">-- See Note [No FunEq improvement for Givens]</span></span>
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1744
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<pre style="margin: 0;">-<span id="LC1744" 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;">isImprovable</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1748" 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;">isImprovable</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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1745
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1749
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<pre style="margin: 0;"> <span id="LC1749" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1746
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1750
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<pre style="margin: 0;"> <span id="LC1750" class="line" lang="haskell"></span>
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1751
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<pre style="margin: 0;"> <span id="LC1751" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1871,24 +1875,6 @@ kinds much match too; so it's easier to let the normal machinery</td>
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1871
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1875
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<pre style="margin: 0;"> <span id="LC1875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">handle it. Instead we are careful to orient the new derived</span></span>
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1872
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1876
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<pre style="margin: 0;"> <span id="LC1876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equality with the template on the left. Delicate, but it works.</span></span>
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1873
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1877
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<pre style="margin: 0;"> <span id="LC1877" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [No FunEq improvement for Givens]</span></span>
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1875
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<pre style="margin: 0;">-<span id="LC1875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1876
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<pre style="margin: 0;">-<span id="LC1876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't do improvements (injectivity etc) for Givens. Why?</span></span>
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1877
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<pre style="margin: 0;">-<span id="LC1877" class="line" lang="haskell"></span>
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1878
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<pre style="margin: 0;">-<span id="LC1878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* It generates Derived constraints on skolems, which don't do us</span></span>
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1879
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<pre style="margin: 0;">-<span id="LC1879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> much good, except perhaps identify inaccessible branches.</span></span>
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1880
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<pre style="margin: 0;">-<span id="LC1880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (They'd be perfectly valid though.)</span></span>
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1881
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<pre style="margin: 0;">-<span id="LC1881" class="line" lang="haskell"></span>
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1882
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<pre style="margin: 0;">-<span id="LC1882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* For type-nat stuff the derived constraints include type families;</span></span>
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1883
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<pre style="margin: 0;">-<span id="LC1883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> e.g. (a < b), (b < c) ==> a < c If we generate a Derived for this,</span></span>
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1884
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<pre style="margin: 0;">-<span id="LC1884" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we'll generate a Derived/Wanted CFunEqCan; and, since the same</span></span>
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1885
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<pre style="margin: 0;">-<span id="LC1885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> InertCans (after solving Givens) are used for each iteration, that</span></span>
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1886
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<pre style="margin: 0;">-<span id="LC1886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> massively confused the unflattening step (GHC.Tc.Solver.Flatten.unflatten).</span></span>
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1887
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<pre style="margin: 0;">-<span id="LC1887" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In fact it led to some infinite loops:</span></span>
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<pre style="margin: 0;">-<span id="LC1889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> indexed-types/should_compile/T10806</span></span>
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<pre style="margin: 0;">-<span id="LC1890" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> indexed-types/should_compile/T10507</span></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;"> polykinds/T10742</span></span>
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<pre style="margin: 0;"> <span id="LC1878" 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="LC1879" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *******************************************************************</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.hs</strong></a>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP, DeriveFunctor, TypeFamilies, ScopedTypeVariables #-}</span></span>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP, DeriveFunctor, TypeFamilies, ScopedTypeVariables, TypeApplications,</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> DerivingStrategies, GeneralizedNewtypeDeriving #-}</span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-incomplete-record-updates -Wno-incomplete-uni-patterns #-}</span></span>
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<pre style="margin: 0;"> <span id="LC5" 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">@@ -80,7 +81,7 @@ module GHC.Tc.Solver.Monad (</td>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addDictsByClass</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">delDict</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">foldDicts</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">filterDicts</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">findDict</span><span class="p">,</span></span>
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81
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Inert CEqCans</span></span>
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83
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<pre style="margin: 0;">-<span id="LC83" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">findTyEqs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">foldTyEqs</span><span class="p">,</span></span>
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84
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span><span class="p"><span class="idiff left">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff right">)</span>,</span> <span class="nf" style="color: #900; font-weight: 600;">findTyEqs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">foldTyEqs</span><span class="p">,</span></span>
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84
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">findEq</span><span class="p">,</span></span>
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85
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86
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="haskell"></span>
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86
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Inert solved dictionaries</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="91" 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">@@ -90,7 +91,7 @@ module GHC.Tc.Solver.Monad (</td>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">foldIrreds</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The flattening cache</span></span>
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<pre style="margin: 0;">-<span id="LC93" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lookupF<span class="idiff left">latCache</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">extendFlat</span>Cache</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lookupF<span class="idiff left">amApp</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">extendFamApp</span>Cache</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprKicked</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Inert function equalities</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">@@ -186,6 +187,8 @@ import GHC.Utils.Monad</td>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.IORef</span></span>
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<pre style="margin: 0;"> <span id="LC188" 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;">partition</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAccumL</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC189" 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;">Data.Semigroup</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">S</span></span>
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</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;">cons</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nonEmpty</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC191" 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;">Data.List.NonEmpty</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">NE</span></span>
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">defined</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DEBUG</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Graph.Directed</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">@@ -399,12 +402,13 @@ data InertSet</td>
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399
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402
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- used to undo the cycle-breaking needed to handle</span></span>
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403
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<pre style="margin: 0;"> <span id="LC403" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Type variable cycles in Givens] in GHC.Tc.Solver.Canonical</span></span>
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401
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404
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="haskell"></span>
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402
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_f<span class="idiff left right">lat</span>_cache</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_f<span class="idiff left right">amapp</span>_cache</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If F tys :-> (co, rhs, flav),</span></span>
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- then co :: F tys ~ rhs</span></span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- flav is [G]</span></span>
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<pre style="margin: 0;"> <span id="LC409" 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="LC407" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Just a hash-cons cache for use when flattening only</span></span>
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Just a hash-cons cache for use when reducing family applications</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- only</span></span>
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<pre style="margin: 0;"> <span id="LC412" 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="LC413" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Only nominal, Given equalities end up in here (along with</span></span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- top-level instances)</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">@@ -438,7 +442,7 @@ emptyInert :: InertSet</td>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"><span class="n" style="color: #333;">emptyInert</span></span>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IS</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_cans</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyInertCans</span></span>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_cycle_breakers</span> <span class="o" 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="LC441" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_f<span class="idiff left">lat_cache</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyFunEqs</span></span>
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<pre style="margin: 0;">+<span id="LC445" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_f<span class="idiff left right">amapp_cache</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyFunEqs</span></span>
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_solved_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyDictMap</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC447" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC448" 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">@@ -715,7 +719,35 @@ data InertCans -- See Note [Detailed InertCans Invariants] for more</td>
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC720" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">InertEqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DTyVarEnv</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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<pre style="margin: 0;">-<span id="LC718" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [EqualCtList invariants]</span></span>
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</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;">EqualCtList</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC724" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span></span>
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [EqualCtList invariants]</span></span>
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726
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<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"></span>
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727
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<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"><span class="n" style="color: #333;">unitEqualCtList</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;">EqualCtList</span></span>
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728
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"><span class="n" style="color: #333;">unitEqualCtList</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="p">(</span><span class="n" style="color: #333;">ct</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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729
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<pre style="margin: 0;">+<span id="LC729" class="line" lang="haskell"></span>
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730
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"><span class="n" style="color: #333;">addToEqualCtList</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;">EqualCtList</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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731
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<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: This function maintains the "derived-before-wanted" invariant of EqualCtList,</span></span>
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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but not the others. See Note [EqualCtList invariants]</span></span>
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733
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"><span class="n" style="color: #333;">addToEqualCtList</span> <span class="n" style="color: #333;">ct</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="n" style="color: #333;">old_eqs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isWantedCt</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eq1</span> <span class="o" style="font-weight: 600;">:|</span> <span class="n" style="color: #333;">eqs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">old_eqs</span></span>
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="p">(</span><span class="n" style="color: #333;">eq1</span> <span class="o" style="font-weight: 600;">:|</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eqs</span><span class="p">)</span></span>
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737
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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738
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="p">(</span><span class="n" style="color: #333;">ct</span> <span class="p">`</span><span class="n" style="color: #333;">cons</span><span class="p">`</span> <span class="n" style="color: #333;">old_eqs</span><span class="p">)</span></span>
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739
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"><span class="n" style="color: #333;">filterEqualCtList</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</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 class="p">)</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;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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741
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<pre style="margin: 0;">+<span id="LC741" class="line" lang="haskell"><span class="n" style="color: #333;">filterEqualCtList</span> <span class="n" style="color: #333;">pred</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fmap</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="p">(</span><span class="n" style="color: #333;">nonEmpty</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">filter</span> <span class="n" style="color: #333;">pred</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"><span class="n" style="color: #333;">equalCtListToList</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"><span class="n" style="color: #333;">equalCtListToList</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">toList</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;">+<span id="LC746" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC747" class="line" lang="haskell"><span class="n" style="color: #333;">listToEqualCtList</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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<pre style="margin: 0;">+<span id="LC748" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: This does not maintain invariants other than having the EqualCtList be</span></span>
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<pre style="margin: 0;">+<span id="LC749" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- non-empty</span></span>
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<pre style="margin: 0;">+<span id="LC750" class="line" lang="haskell"><span class="n" style="color: #333;">listToEqualCtList</span> <span class="n" style="color: #333;">cts</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="n" style="color: #333;">nonEmpty</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;"> <span id="LC751" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC752" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Detailed InertCans Invariants]</span></span>
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<pre style="margin: 0;"> <span id="LC753" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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">@@ -756,8 +788,6 @@ The Wanteds can't rewrite anything which is why we put them last</td>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [inert_eqs: the inert equalities]</span></span>
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<pre style="margin: 0;"> <span id="LC790" 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="LC759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"RAE": update. Don't forget to update (K1). See kick_out_rewritable</span></span>
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<pre style="margin: 0;">-<span id="LC760" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Definition [Can-rewrite relation]</span></span>
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<pre style="margin: 0;"> <span id="LC792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A "can-rewrite" relation between flavours, written f1 >= f2, is a</span></span>
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">binary relation with the following properties</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">@@ -770,25 +800,24 @@ Lemma. If f1 >= f then f1 >= f1</td>
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Proof. By property (R2), with f1=f2</span></span>
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Definition [Generalised substitution]</span></span>
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<pre style="margin: 0;">-<span id="LC773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A "generalised substitution" S is a set of triples (<span class="idiff left right">a</span> -f-> t), where</span></span>
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774
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<pre style="margin: 0;">-<span id="LC774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">a is a type variable</span></span></span>
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803
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A "generalised substitution" S is a set of triples (<span class="idiff left right">t0</span> -f-> t), where</span></span>
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804
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">t0 is a type variable or an exactly-saturated type family application</span></span></span>
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775
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805
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> t is a type</span></span>
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776
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806
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f is a flavour</span></span>
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777
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807
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">such that</span></span>
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778
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<pre style="margin: 0;">-<span id="LC778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (WF1) if (<span class="idiff left right">a</span> -f1-> t1) in S</span></span>
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779
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<pre style="margin: 0;">-<span id="LC779" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (<span class="idiff left right">a</span> -f2-> t2) in S</span></span>
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780
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<pre style="margin: 0;">-<span id="LC780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then <span class="idiff left right">neither (f1 >= f2) nor (f2 >= f1) hold</span></span></span>
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781
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<pre style="margin: 0;">-<span id="LC781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (WF2) if (<span class="idiff left right">a -f-> t) is in S, then t /= a</span></span></span>
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<pre style="margin: 0;">+<span id="LC808" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (WF1) if (<span class="idiff left right">t0</span> -f1-> t1) in S</span></span>
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809
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (<span class="idiff left right">t0'</span> -f2-> t2) in S</span></span>
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then <span class="idiff left right">either not (f1 >= f2) or t0 does not appear within t0'</span></span></span>
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811
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<pre style="margin: 0;">+<span id="LC811" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (WF2) if (<span class="idiff left right">t0 -f-> t) is in S, then t /= t0</span></span></span>
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782
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812
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="haskell"></span>
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783
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813
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<pre style="margin: 0;"> <span id="LC813" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Definition [Applying a generalised substitution]</span></span>
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784
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814
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If S is a generalised substitution</span></span>
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785
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<pre style="margin: 0;">-<span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> S(f,a) = t, if (a -fs-> t) in S, and fs >= f</span></span>
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786
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<pre style="margin: 0;">-<span id="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = a, otherwise</span></span>
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787
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<pre style="margin: 0;">-<span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Application extends naturally to types S(f,t), modulo roles.</span></span>
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788
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<pre style="margin: 0;">-<span id="LC788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [Flavours with roles].</span></span>
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<pre style="margin: 0;">+<span id="LC815" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> S(f,t0) = t, if (t0 -fs-> t) in S, and fs >= f</span></span>
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<pre style="margin: 0;">+<span id="LC816" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = apply S to components of t0, otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC817" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Flavours with roles].</span></span>
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818
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Theorem: S(f,<span class="idiff left right">a</span>) is well defined as a function.</span></span>
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791
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<pre style="margin: 0;">-<span id="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Proof: Suppose (<span class="idiff left right">a -f1-> t1) and (a</span> -f2-> t2) are both in S,</span></span>
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<pre style="margin: 0;">+<span id="LC819" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Theorem: S(f,<span class="idiff left right">t0</span>) is well defined as a function.</span></span>
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<pre style="margin: 0;">+<span id="LC820" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Proof: Suppose (<span class="idiff left right">t0 -f1-> t1) and (t0</span> -f2-> t2) are both in S,</span></span>
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<pre style="margin: 0;"> <span id="LC821" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and f1 >= f and f2 >= f</span></span>
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<pre style="margin: 0;"> <span id="LC822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Then by (R2) f1 >= f2 or f2 >= f1, which contradicts (WF1)</span></span>
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<pre style="margin: 0;"> <span id="LC823" 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">@@ -811,40 +840,41 @@ Our main invariant:</td>
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<pre style="margin: 0;"> <span id="LC840" 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="LC841" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that inertness is not the same as idempotence. To apply S to a</span></span>
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<pre style="margin: 0;">-<span id="LC814" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type, you may have to apply it recursive. But inertness does</span></span>
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type, you may have to apply it recursive<span class="idiff left right">ly</span>. But inertness does</span></span>
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">guarantee that this recursive use will terminate.</span></span>
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845
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Extending the inert equalities]</span></span>
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847
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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848
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Main Theorem [Stability under extension]</span></span>
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849
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Suppose we have a "work item"</span></span>
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<pre style="margin: 0;">-<span id="LC821" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">a</span> -fw-> t</span></span>
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">t0</span> -fw-> t</span></span>
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822
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851
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and an inert generalised substitution S,</span></span>
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823
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<pre style="margin: 0;">-<span id="LC823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> THEN the extended substitution T = S+(<span class="idiff left right">a</span> -fw-> t)</span></span>
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852
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> THEN the extended substitution T = S+(<span class="idiff left right">t0</span> -fw-> t)</span></span>
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824
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853
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is an inert generalised substitution</span></span>
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825
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854
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> PROVIDED</span></span>
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826
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<pre style="margin: 0;">-<span id="LC826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (T1) S(fw,<span class="idiff left right">a) = a</span> -- LHS of work-item is a fixpoint of S(fw,_)</span></span>
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827
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<pre style="margin: 0;">-<span id="LC827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (T2) S(fw,t) <span class="idiff left right">= t</span> -- RHS of work-item is a fixpoint of S(fw,_)</span></span>
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828
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<pre style="margin: 0;">-<span id="LC828" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (T3) <span class="idiff left right">a not in t</span> -- No occurs check in the work item</span></span>
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855
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (T1) S(fw,<span class="idiff left right">t0) = t0</span> -- LHS of work-item is a fixpoint of S(fw,_)</span></span>
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856
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (T2) S(fw,t) <span class="idiff left right"> = t </span> -- RHS of work-item is a fixpoint of S(fw,_)</span></span>
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857
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (T3) <span class="idiff left right">t0 not in t </span> -- No occurs check in the work item</span></span>
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829
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"></span>
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830
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<pre style="margin: 0;">-<span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> AND, for every (<span class="idiff left right">b</span> -fs-> s) in S:</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> AND, for every (<span class="idiff left right">t0'</span> -fs-> s) in S:</span></span>
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831
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860
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (K0) not (fw >= fs)</span></span>
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832
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Reason: suppose we kick out (a -fs-> s),</span></span>
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833
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<pre style="margin: 0;">-<span id="LC833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and add (<span class="idiff left right">a</span> -fw-> t) to the inert set.</span></span>
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862
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and add (<span class="idiff left right">t0</span> -fw-> t) to the inert set.</span></span>
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834
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863
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The latter can't rewrite the former,</span></span>
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835
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864
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so the kick-out achieved nothing</span></span>
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836
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"></span>
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837
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<pre style="margin: 0;">-<span id="LC837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> OR { (K1) not (</span></span>
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866
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> OR { (K1) t0 is not rewritable in t0'. That is, t0 does not occur</span></span>
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867
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<pre style="margin: 0;">+<span id="LC867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in t0' (except perhaps in a cast or coercion).</span></span>
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Reason: if fw >= fs, WF1 says we can't have both</span></span>
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<pre style="margin: 0;">-<span id="LC839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">a -fw-> t and a</span> -fs-> s</span></span>
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<pre style="margin: 0;">+<span id="LC869" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">t0 -fw-> t and F t0</span> -fs-> s</span></span>
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> AND (K2): guarantees inertness of the new substitution</span></span>
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { (K2a) not (fs >= fs)</span></span>
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873
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<pre style="margin: 0;"> <span id="LC873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> OR (K2b) fs >= fw</span></span>
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<pre style="margin: 0;">-<span id="LC844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> OR (K2d) <span class="idiff left right">a</span> not in s }</span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> OR (K2d) <span class="idiff left right">t0</span> not in s }</span></span>
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875
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> AND (K3) See Note [K3: completeness of solving]</span></span>
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<pre style="margin: 0;">-<span id="LC847" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { (K3a) If the role of fs is nominal: s /= <span class="idiff left right">a</span></span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { (K3a) If the role of fs is nominal: s /= <span class="idiff left right">t0</span></span></span>
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (K3b) If the role of fs is representational:</span></span>
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> s is not of form (a t1 .. tn) } }</span></span>
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<pre style="margin: 0;"> <span id="LC880" 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">@@ -883,10 +913,10 @@ The idea is that</td>
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<pre style="margin: 0;"> <span id="LC913" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It's used to avoid even looking for constraint to kick out.</span></span>
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<pre style="margin: 0;"> <span id="LC914" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC915" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Lemma (L1): The conditions of the Main Theorem imply that there is no</span></span>
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<pre style="margin: 0;">-<span id="LC886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (<span class="idiff left right">a</span> -fs-> t) in S, s.t. (fs >= fw).</span></span>
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (<span class="idiff left right">t0</span> -fs-> t) in S, s.t. (fs >= fw).</span></span>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Proof. Suppose the contrary (fs >= fw). Then because of (T1),</span></span>
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<pre style="margin: 0;">-<span id="LC888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> S(fw,<span class="idiff left right">a)=a. But since fs>=fw, S(fw,a) = s, hence s=a</span>. But now we</span></span>
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<pre style="margin: 0;">-<span id="LC889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have (<span class="idiff left right">a -fs-> a</span>) in S, which contradicts (WF2).</span></span>
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<pre style="margin: 0;">+<span id="LC918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> S(fw,<span class="idiff left right">t0)=t0. But since fs>=fw, S(fw,t0) = s, hence s=t0</span>. But now we</span></span>
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have (<span class="idiff left right">t0 -fs-> t0</span>) in S, which contradicts (WF2).</span></span>
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The extended substitution satisfies (WF1) and (WF2)</span></span>
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (K1) plus (L1) guarantee that the extended substitution satisfies (WF1).</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">@@ -1034,7 +1064,7 @@ instance Outputable InertCans where</td>
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1034
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Unsolved goals ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">int</span> <span class="n" style="color: #333;">count</span></span>
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1035
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"> <span class="p">]</span></span>
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1036
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1066
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<pre style="margin: 0;"> <span id="LC1066" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1037
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<pre style="margin: 0;">-<span id="LC1037" class="line" lang="haskell"> <span class="n" style="color: #333;">folder</span> <span class="n" style="color: #333;"><span class="idiff left">eqs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rest</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">list</span>ToBag</span> <span class="n" style="color: #333;">eqs</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span> <span class="n" style="color: #333;">rest</span></span>
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"> <span class="n" style="color: #333;">folder</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">EqualCtList</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eqs</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rest</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nonEmpty</span>ToBag</span> <span class="n" style="color: #333;">eqs</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span> <span class="n" style="color: #333;">rest</span></span>
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1068
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"></span>
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1069
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<pre style="margin: 0;"> <span id="LC1069" 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="LC1070" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</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">@@ -1364,7 +1394,7 @@ should_split_match_args inert_eqs fun_eqs tys</td>
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<pre style="margin: 0;"> <span id="LC1394" class="line" lang="haskell"></span>
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1395
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<pre style="margin: 0;"> <span id="LC1395" class="line" lang="haskell"><span class="n" style="color: #333;">canRewriteTv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertEqs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EqRel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</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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1366
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1396
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<pre style="margin: 0;"> <span id="LC1396" class="line" lang="haskell"><span class="n" style="color: #333;">canRewriteTv</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">tv</span></span>
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1367
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<pre style="margin: 0;">-<span id="LC1367" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupDVarEnv</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">tv</span></span>
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1397
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<pre style="margin: 0;">+<span id="LC1397" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">EqualCtList</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:|</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</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;">lookupDVarEnv</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">tv</span></span>
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1398
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<pre style="margin: 0;"> <span id="LC1398" class="line" lang="haskell"> <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_eq_rel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eq_rel1</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ct</span></span>
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1369
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1399
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<pre style="margin: 0;"> <span id="LC1399" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eq_rel1</span> <span class="p">`</span><span class="n" style="color: #333;">eqCanRewrite</span><span class="p">`</span> <span class="n" style="color: #333;">eq_rel</span></span>
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1370
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1400
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<pre style="margin: 0;"> <span id="LC1400" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1402" 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">@@ -1372,7 +1402,7 @@ canRewriteTv inert_eqs eq_rel tv</td>
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1372
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1402
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<pre style="margin: 0;"> <span id="LC1402" class="line" lang="haskell"></span>
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1373
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1403
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<pre style="margin: 0;"> <span id="LC1403" class="line" lang="haskell"><span class="n" style="color: #333;">canRewriteTyFam</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</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;">EqRel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</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;">Bool</span></span>
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1374
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1404
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<pre style="margin: 0;"> <span id="LC1404" class="line" lang="haskell"><span class="n" style="color: #333;">canRewriteTyFam</span> <span class="n" style="color: #333;">fun_eqs</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">tf</span> <span class="n" style="color: #333;">args</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1375" 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">
1375
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<pre style="margin: 0;">-<span id="LC1375" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findFunEq</span> <span class="n" style="color: #333;">fun_eqs</span> <span class="n" style="color: #333;">tf</span> <span class="n" style="color: #333;">args</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1405" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1405
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<pre style="margin: 0;">+<span id="LC1405" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">EqualCtList</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:|</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</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;">findFunEq</span> <span class="n" style="color: #333;">fun_eqs</span> <span class="n" style="color: #333;">tf</span> <span class="n" style="color: #333;">args</span></span>
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1376
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1406
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<pre style="margin: 0;"> <span id="LC1406" class="line" lang="haskell"> <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_eq_rel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eq_rel1</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ct</span></span>
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1377
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1407
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<pre style="margin: 0;"> <span id="LC1407" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eq_rel1</span> <span class="p">`</span><span class="n" style="color: #333;">eqCanRewrite</span><span class="p">`</span> <span class="n" style="color: #333;">eq_rel</span></span>
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1378
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1408
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1392" 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="1422" 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">@@ -1392,7 +1422,7 @@ isImprovable _ = True</td>
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1392
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1422
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="haskell"></span>
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1393
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1423
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<pre style="margin: 0;"> <span id="LC1423" class="line" lang="haskell"><span class="n" style="color: #333;">addTyEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertEqs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InertEqs</span></span>
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1394
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1424
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<pre style="margin: 0;"> <span id="LC1424" class="line" lang="haskell"><span class="n" style="color: #333;">addTyEq</span> <span class="n" style="color: #333;">old_eqs</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ct</span></span>
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1395
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<pre style="margin: 0;">-<span id="LC1395" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendDVarEnv_C</span> <span class="n" style="color: #333;">add_eq</span> <span class="n" style="color: #333;">old_eqs</span> <span class="n" style="color: #333;">tv</span> <span class="p"><span class="idiff left">[</span></span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="p"><span class="idiff right">]</span></span></span>
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1425
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<pre style="margin: 0;">+<span id="LC1425" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendDVarEnv_C</span> <span class="n" style="color: #333;">add_eq</span> <span class="n" style="color: #333;">old_eqs</span> <span class="n" style="color: #333;">tv</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">unitEqualCtList</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="p"><span class="idiff right">)</span></span></span>
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1396
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1426
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<pre style="margin: 0;"> <span id="LC1426" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1397
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1427
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<pre style="margin: 0;"> <span id="LC1427" class="line" lang="haskell"> <span class="n" style="color: #333;">add_eq</span> <span class="n" style="color: #333;">old_eqs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addToEqualCtList</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">old_eqs</span></span>
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1398
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1428
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<pre style="margin: 0;"> <span id="LC1428" 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">@@ -1402,43 +1432,36 @@ addCanFunEq old_eqs fun_tc fun_args ct</td>
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1402
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1432
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<pre style="margin: 0;"> <span id="LC1432" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alterTcApp</span> <span class="n" style="color: #333;">old_eqs</span> <span class="n" style="color: #333;">fun_tc</span> <span class="n" style="color: #333;">fun_args</span> <span class="n" style="color: #333;">upd</span></span>
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1403
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1433
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<pre style="margin: 0;"> <span id="LC1433" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1404
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<td class="diff-line-num new_line" data-linenumber="1434" 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">
1434
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<pre style="margin: 0;"> <span id="LC1434" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">old_equal_ct_list</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addToEqualCtList</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">old_equal_ct_list</span></span>
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1405
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<td class="diff-line-num new_line old" data-linenumber="1435" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1405" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="p">[</span><span class="n" style="color: #333;">ct</span><span class="p">]</span></span>
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1406
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<pre style="margin: 0;">-<span id="LC1406" class="line" lang="haskell"></span>
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1407
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<pre style="margin: 0;">-<span id="LC1407" class="line" lang="haskell"><span class="n" style="color: #333;">addToEqualCtList</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;">EqualCtList</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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1408
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<pre style="margin: 0;">-<span id="LC1408" class="line" lang="haskell"><span class="n" style="color: #333;">addToEqualCtList</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">old_eqs</span></span>
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1409
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<pre style="margin: 0;">-<span id="LC1409" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isWantedCt</span> <span class="n" style="color: #333;">ct</span></span>
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1410
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<pre style="margin: 0;">-<span id="LC1410" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">eq1</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eqs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">old_eqs</span></span>
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1411
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<td class="diff-line-num new_line old" data-linenumber="1435" 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="LC1411" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eq1</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">eqs</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1412" 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">
1412
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<pre style="margin: 0;">-<span id="LC1412" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1413
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<pre style="margin: 0;">-<span id="LC1413" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">old_eqs</span></span>
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1435
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<pre style="margin: 0;">+<span id="LC1435" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unitEqualCtList</span> <span class="n" style="color: #333;">ct</span></span>
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1414
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1436
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<pre style="margin: 0;"> <span id="LC1436" class="line" lang="haskell"></span>
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1415
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1437
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<pre style="margin: 0;"> <span id="LC1437" class="line" lang="haskell"><span class="n" style="color: #333;">foldTyEqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InertEqs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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1416
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1438
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<pre style="margin: 0;"> <span id="LC1438" class="line" lang="haskell"><span class="n" style="color: #333;">foldTyEqs</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">eqs</span> <span class="n" style="color: #333;">z</span></span>
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1417
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<pre style="margin: 0;">-<span id="LC1417" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldDVarEnv</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;"><span class="idiff left right">cts</span></span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">eqs</span></span>
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1439
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<pre style="margin: 0;">+<span id="LC1439" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldDVarEnv</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">EqualCtList</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cts</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">eqs</span></span>
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1418
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1440
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<pre style="margin: 0;"> <span id="LC1440" class="line" lang="haskell"></span>
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1419
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<pre style="margin: 0;">-<span id="LC1419" class="line" lang="haskell"><span class="n" style="color: #333;">findTyEqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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1420
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<pre style="margin: 0;">-<span id="LC1420" class="line" lang="haskell"><span class="n" style="color: #333;">findTyEqs</span> <span class="n" style="color: #333;">icans</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupDVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">icans</span><span class="p">)</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">orElse</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1441
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<pre style="margin: 0;">+<span id="LC1441" class="line" lang="haskell"><span class="n" style="color: #333;">findTyEqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span></span>
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1442
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<pre style="margin: 0;">+<span id="LC1442" class="line" lang="haskell"><span class="n" style="color: #333;">findTyEqs</span> <span class="n" style="color: #333;">icans</span> <span class="n" style="color: #333;">tv</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="n" style="color: #333;">id</span> <span class="p">(</span><span class="n" style="color: #333;">fmap</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">equalCtListToList</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1443" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1443
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<pre style="margin: 0;">+<span id="LC1443" class="line" lang="haskell"> <span class="n" style="color: #333;">lookupDVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">icans</span><span class="p">)</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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1421
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1444
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<pre style="margin: 0;"> <span id="LC1444" class="line" lang="haskell"></span>
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1422
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<td class="diff-line-num new_line" data-linenumber="1445" 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">
1445
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<pre style="margin: 0;"> <span id="LC1445" class="line" lang="haskell"><span class="n" style="color: #333;">delEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqLHS</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span></span>
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1423
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1446
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<pre style="margin: 0;"> <span id="LC1446" class="line" lang="haskell"><span class="n" style="color: #333;">delEq</span> <span class="n" style="color: #333;">ic</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lhs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1424
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1447
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<pre style="margin: 0;"> <span id="LC1447" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span></span>
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1425
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<pre style="margin: 0;">-<span id="LC1425" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">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;"><span class="idiff left">modifyDVarEnv</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">filter</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">not</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isThisOne</span></span><span class="p"><span class="idiff right">))</span></span> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span> <span class="n" style="color: #333;">tv</span> <span class="p">}</span></span>
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1448
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<pre style="margin: 0;">+<span id="LC1448" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">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;"><span class="idiff left">alterDVarEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">upd</span></span> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span> <span class="n" style="color: #333;">tv</span> <span class="p">}</span></span>
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1426
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1449
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<pre style="margin: 0;"> <span id="LC1449" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">tf</span> <span class="n" style="color: #333;">args</span></span>
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1427
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<td class="diff-line-num new_line" data-linenumber="1450" 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">
1450
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<pre style="margin: 0;"> <span id="LC1450" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ic</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;">alterTcApp</span> <span class="p">(</span><span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span> <span class="n" style="color: #333;">tf</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">upd</span> <span class="p">}</span></span>
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1428
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<pre style="margin: 0;">-<span id="LC1428" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1429
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<pre style="margin: 0;">-<span id="LC1429" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">eq_ct_list</span><span class="p">)</span></span>
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1430
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<td class="diff-line-num new_line old" data-linenumber="1451" 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="LC1430" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">filtered</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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<td class="diff-line-num old old_line" data-linenumber="1431" 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">
1431
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<td class="diff-line-num new_line old" data-linenumber="1451" 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="LC1431" 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;">Just</span> <span class="n" style="color: #333;">filtered</span></span>
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1432
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<pre style="margin: 0;">-<span id="LC1432" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">filtered</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;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isThisOne</span><span class="p">)</span> <span class="n" style="color: #333;">eq_ct_list</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1433" 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">
1433
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<td class="diff-line-num new_line old" data-linenumber="1451" 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="LC1433" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1434
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1451
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<pre style="margin: 0;"> <span id="LC1451" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1452
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"> <span class="n" style="color: #333;">isThisOne</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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1435
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<td class="diff-line-num new_line" data-linenumber="1453" 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">
1453
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<pre style="margin: 0;"> <span id="LC1453" class="line" lang="haskell"> <span class="n" style="color: #333;">isThisOne</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_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">t1</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcEqTypeNoKindCheck</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">t1</span></span>
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1436
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<td class="diff-line-num new_line" data-linenumber="1454" 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">
1454
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<pre style="margin: 0;"> <span id="LC1454" class="line" lang="haskell"> <span class="n" style="color: #333;">isThisOne</span> <span class="n" style="color: #333;">other</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"delEq"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ic</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">other</span><span class="p">)</span></span>
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1437
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<td class="diff-line-num new_line" data-linenumber="1455" 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">
1455
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<pre style="margin: 0;"> <span id="LC1455" class="line" lang="haskell"></span>
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1438
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<td class="diff-line-num new_line old" data-linenumber="1456" 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="LC1438" class="line" lang="haskell"><span class="n" style="color: #333;">findEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqLHS</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1439" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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1456
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<pre style="margin: 0;">+<span id="LC1456" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</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;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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1457
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<pre style="margin: 0;">+<span id="LC1457" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">eq_ct_list</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterEqualCtList</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isThisOne</span><span class="p">)</span> <span class="n" style="color: #333;">eq_ct_list</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1458" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1458
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<pre style="margin: 0;">+<span id="LC1458" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1459
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<pre style="margin: 0;">+<span id="LC1459" class="line" lang="haskell"></span>
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1460
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<pre style="margin: 0;">+<span id="LC1460" class="line" lang="haskell"><span class="n" style="color: #333;">findEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqLHS</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span></span>
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1439
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<td class="diff-line-num new_line" data-linenumber="1461" 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">
1461
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<pre style="margin: 0;"> <span id="LC1461" class="line" lang="haskell"><span class="n" style="color: #333;">findEq</span> <span class="n" style="color: #333;">icans</span> <span class="p">(</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 class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findTyEqs</span> <span class="n" style="color: #333;">icans</span> <span class="n" style="color: #333;">tv</span></span>
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1440
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<td class="diff-line-num new_line" data-linenumber="1462" 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">
1462
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<pre style="margin: 0;"> <span id="LC1462" class="line" lang="haskell"><span class="n" style="color: #333;">findEq</span> <span class="n" style="color: #333;">icans</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">fun_tc</span> <span class="n" style="color: #333;">fun_args</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1441" 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">
1441
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<td class="diff-line-num new_line old" data-linenumber="1463" 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="LC1441" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findFunEq</span> <span class="p">(</span><span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">icans</span><span class="p">)</span> <span class="n" style="color: #333;">fun_tc</span> <span class="n" style="color: #333;">fun_args</span> <span class="p">`</span><span class="n" style="color: #333;">orElse</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1463
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<pre style="margin: 0;">+<span id="LC1463" class="line" lang="haskell"> <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="n" style="color: #333;">id</span> <span class="p">(</span><span class="n" style="color: #333;">fmap</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">equalCtListToList</span> <span class="o" style="font-weight: 600;">$</span></span>
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1464
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<pre style="margin: 0;">+<span id="LC1464" class="line" lang="haskell"> <span class="n" style="color: #333;">findFunEq</span> <span class="p">(</span><span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">icans</span><span class="p">)</span> <span class="n" style="color: #333;">fun_tc</span> <span class="n" style="color: #333;">fun_args</span><span class="p">)</span></span>
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1442
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1465
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<pre style="margin: 0;"> <span id="LC1465" class="line" lang="haskell"></span>
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1443
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1466
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<pre style="margin: 0;"> <span id="LC1466" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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1467
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<pre style="margin: 0;"> <span id="LC1467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</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">@@ -1707,11 +1730,12 @@ kick_out_rewritable new_fr new_lhs</td>
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1707
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1730
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<pre style="margin: 0;"> <span id="LC1730" class="line" lang="haskell"> <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="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">],</span> <span class="n" style="color: #333;">container</span><span class="p">)</span></span>
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1708
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1731
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<pre style="margin: 0;"> <span id="LC1731" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">],</span> <span class="n" style="color: #333;">container</span><span class="p">)</span></span>
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1709
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1732
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<pre style="margin: 0;"> <span id="LC1732" class="line" lang="haskell"> <span class="n" style="color: #333;">kick_out_eqs</span> <span class="n" style="color: #333;">extend</span> <span class="n" style="color: #333;">eqs</span> <span class="p">(</span><span class="n" style="color: #333;">acc_out</span><span class="p">,</span> <span class="n" style="color: #333;">acc_in</span><span class="p">)</span></span>
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1710
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<pre style="margin: 0;">-<span id="LC1710" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">eqs_out</span> <span class="p">`</span><span class="n" style="color: #333;">chkAppend</span><span class="p">`</span> <span class="n" style="color: #333;">acc_out</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">eqs_in</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1711
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<pre style="margin: 0;">-<span id="LC1711" 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;">acc_in</span></span>
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1712
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<pre style="margin: 0;">-<span id="LC1712" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">eq1</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">extend</span> <span class="n" style="color: #333;">acc_in</span> <span class="p">(</span><span class="n" style="color: #333;">cc_lhs</span> <span class="n" style="color: #333;">eq1</span><span class="p">)</span> <span class="n" style="color: #333;">eqs_in</span><span class="p">)</span></span>
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1733
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<pre style="margin: 0;">+<span id="LC1733" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">eqs_out</span> <span class="p">`</span><span class="n" style="color: #333;">chkAppend</span><span class="p">`</span> <span class="n" style="color: #333;">acc_out</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">listToEqualCtList</span> <span class="n" style="color: #333;">eqs_in</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1734
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<pre style="margin: 0;">+<span id="LC1734" 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;">acc_in</span></span>
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1735
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<pre style="margin: 0;">+<span id="LC1735" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">eqs_in_ecl</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="p">(</span><span class="n" style="color: #333;">eq1</span> <span class="o" style="font-weight: 600;">:|</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1736" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1736
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<pre style="margin: 0;">+<span id="LC1736" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">extend</span> <span class="n" style="color: #333;">acc_in</span> <span class="p">(</span><span class="n" style="color: #333;">cc_lhs</span> <span class="n" style="color: #333;">eq1</span><span class="p">)</span> <span class="n" style="color: #333;">eqs_in_ecl</span><span class="p">)</span></span>
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1713
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1737
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<pre style="margin: 0;"> <span id="LC1737" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1714
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<pre style="margin: 0;">-<span id="LC1714" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">eqs_out</span><span class="p">,</span> <span class="n" style="color: #333;">eqs_in</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="n" style="color: #333;">kick_out_eq</span> <span class="n" style="color: #333;"><span class="idiff left right">eqs</span></span></span>
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1738
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<pre style="margin: 0;">+<span id="LC1738" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">eqs_out</span><span class="p">,</span> <span class="n" style="color: #333;">eqs_in</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="n" style="color: #333;">kick_out_eq</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">equalCtListToList</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eqs</span></span><span class="p"><span class="idiff right">)</span></span></span>
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1715
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1739
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<pre style="margin: 0;"> <span id="LC1739" class="line" lang="haskell"></span>
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1716
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1740
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Implements criteria K1-K3 in Note [Extending the inert equalities]</span></span>
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1717
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1741
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<pre style="margin: 0;"> <span id="LC1741" class="line" lang="haskell"> <span class="n" style="color: #333;">kick_out_eq</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="n" style="color: #333;">lhs</span><span class="p">,</span> <span class="n" style="color: #333;">cc_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1955" 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="1979" 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">@@ -1955,8 +1979,9 @@ getInertGivens :: TcS [Ct]</td>
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1955
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1979
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<pre style="margin: 0;"> <span id="LC1979" class="line" lang="haskell"><span class="n" style="color: #333;">getInertGivens</span></span>
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1956
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1980
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<pre style="margin: 0;"> <span id="LC1980" 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="n" style="color: #333;">getInertCans</span></span>
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1957
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1981
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<pre style="margin: 0;"> <span id="LC1981" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldDicts</span> <span class="p">(</span><span class="o" style="font-weight: 600;">:</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">inert_dicts</span> <span class="n" style="color: #333;">inerts</span><span class="p">)</span></span>
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1958
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<pre style="margin: 0;">-<span id="LC1958" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">foldFunEqs</span> <span class="p">(</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">inerts</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1959" 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">
1959
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<td class="diff-line-num new_line old" data-linenumber="1982" 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="LC1959" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">concat</span> <span class="p">(</span><span class="n" style="color: #333;">dVarEnvElts</span> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">inerts</span><span class="p">))</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1960" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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1982
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<pre style="margin: 0;">+<span id="LC1982" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">foldFunEqs</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">ecl</span> <span class="n" style="color: #333;">out</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">equalCtListToList</span> <span class="n" style="color: #333;">ecl</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">out</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1983" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1983
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<pre style="margin: 0;">+<span id="LC1983" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">inerts</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1984" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1984
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<pre style="margin: 0;">+<span id="LC1984" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">concatMap</span> <span class="n" style="color: #333;">equalCtListToList</span> <span class="p">(</span><span class="n" style="color: #333;">dVarEnvElts</span> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">inerts</span><span class="p">))</span></span>
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1960
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<td class="diff-line-num new_line" data-linenumber="1985" 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">
1985
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<pre style="margin: 0;"> <span id="LC1985" 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;">filter</span> <span class="n" style="color: #333;">isGivenCt</span> <span class="n" style="color: #333;">all_cts</span><span class="p">)</span> <span class="p">}</span></span>
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1961
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1986
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<pre style="margin: 0;"> <span id="LC1986" class="line" lang="haskell"></span>
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1962
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1987
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<pre style="margin: 0;"> <span id="LC1987" class="line" lang="haskell"><span class="n" style="color: #333;">getPendingGivenScs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2043" 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="2068" 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">@@ -2043,8 +2068,9 @@ getUnsolvedInerts</td>
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2043
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2068
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<pre style="margin: 0;"> <span id="LC2068" class="line" lang="haskell"> <span class="n" style="color: #333;">add_if_unsolved</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_unsolved</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct</span> <span class="p">`</span><span class="n" style="color: #333;">consCts</span><span class="p">`</span> <span class="n" style="color: #333;">cts</span></span>
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2044
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2069
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<pre style="margin: 0;"> <span id="LC2069" 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;">cts</span></span>
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2045
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2070
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<pre style="margin: 0;"> <span id="LC2070" class="line" lang="haskell"></span>
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2046
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<pre style="margin: 0;">-<span id="LC2046" class="line" lang="haskell"> <span class="n" style="color: #333;">add_if_unsolveds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span></span>
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2047
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<pre style="margin: 0;">-<span id="LC2047" class="line" lang="haskell"> <span class="n" style="color: #333;">add_if_unsolveds</span> <span class="n" style="color: #333;">new_cts</span> <span class="n" style="color: #333;">old_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add_if_unsolved</span> <span class="n" style="color: #333;">old_cts</span> <span class="n" style="color: #333;">new_cts</span></span>
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2071
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<pre style="margin: 0;">+<span id="LC2071" class="line" lang="haskell"> <span class="n" style="color: #333;">add_if_unsolveds</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;">Cts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span></span>
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2072
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<pre style="margin: 0;">+<span id="LC2072" class="line" lang="haskell"> <span class="n" style="color: #333;">add_if_unsolveds</span> <span class="n" style="color: #333;">new_cts</span> <span class="n" style="color: #333;">old_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add_if_unsolved</span> <span class="n" style="color: #333;">old_cts</span></span>
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2073
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<pre style="margin: 0;">+<span id="LC2073" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">equalCtListToList</span> <span class="n" style="color: #333;">new_cts</span><span class="p">)</span></span>
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2048
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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;">is_unsolved</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isGivenCt</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Wanted or Derived</span></span>
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2050
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2076
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<pre style="margin: 0;"> <span id="LC2076" 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">@@ -2079,8 +2105,8 @@ getHasGivenEqs tclvl</td>
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2079
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2105
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<pre style="margin: 0;"> <span id="LC2105" class="line" lang="haskell"> <span class="n" style="color: #333;">lift_equal_ct_list</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</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;">HasGivenEqs</span><span class="p">)</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;">HasGivenEqs</span></span>
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2080
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2106
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<pre style="margin: 0;"> <span id="LC2106" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- returns NoGivenEqs for non-singleton lists, as Given lists are always</span></span>
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2081
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2107
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<pre style="margin: 0;"> <span id="LC2107" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- singletons</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;">lift_equal_ct_list</span> <span class="n" style="color: #333;">check</span> <span class="p"><span class="idiff left">[</span></span><span class="n" style="color: #333;"><span class="idiff">ct</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;">check</span> <span class="n" style="color: #333;">ct</span></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;">lift_equal_ct_list</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="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span></span>
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2108
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<pre style="margin: 0;">+<span id="LC2108" class="line" lang="haskell"> <span class="n" style="color: #333;">lift_equal_ct_list</span> <span class="n" style="color: #333;">check</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">EqualCtList</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:|</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">[]</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;">check</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">+<span id="LC2109" class="line" lang="haskell"> <span class="n" style="color: #333;">lift_equal_ct_list</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span></span>
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2084
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2110
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<pre style="margin: 0;"> <span id="LC2110" class="line" lang="haskell"></span>
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2111
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<pre style="margin: 0;"> <span id="LC2111" class="line" lang="haskell"> <span class="n" style="color: #333;">check_local_given_tv_eq</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;">HasGivenEqs</span></span>
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2086
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2112
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<pre style="margin: 0;"> <span id="LC2112" class="line" lang="haskell"> <span class="n" style="color: #333;">check_local_given_tv_eq</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 class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span><span class="p">})</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2102,7 +2128,10 @@ getHasGivenEqs tclvl</td>
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2102
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2128
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<pre style="margin: 0;"> <span id="LC2128" class="line" lang="haskell"></span>
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2103
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2129
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<pre style="margin: 0;"> <span id="LC2129" 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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2104
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2130
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<pre style="margin: 0;"> <span id="LC2130" 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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2105
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<pre style="margin: 0;">-<span id="LC2105" 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;">tclvl</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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2131
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<pre style="margin: 0;">+<span id="LC2131" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: a meta-tv alpha[3] may end up unifying with skolem b[2],</span></span>
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2132
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<pre style="margin: 0;">+<span id="LC2132" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so treat it as an "outer" var, even at level 3.</span></span>
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<pre style="margin: 0;">+<span id="LC2133" 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;">isTouchableMetaTyVar</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">||</span></span>
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2134
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<pre style="margin: 0;">+<span id="LC2134" class="line" lang="haskell"> <span class="n" style="color: #333;">tclvl</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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2106
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2135
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<pre style="margin: 0;"> <span id="LC2135" 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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2107
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2136
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<pre style="margin: 0;"> <span id="LC2136" class="line" lang="haskell"></span>
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2108
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2137
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<pre style="margin: 0;"> <span id="LC2137" class="line" lang="haskell"><span class="cd">-- | Returns Given constraints that might,</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">@@ -2215,8 +2244,6 @@ considered rigid.</td>
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2215
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2244
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<pre style="margin: 0;"> <span id="LC2244" class="line" lang="haskell"></span>
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2216
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2245
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<pre style="margin: 0;"> <span id="LC2245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [When does an implication have given equalities?]</span></span>
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2217
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2246
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<pre style="margin: 0;"> <span id="LC2246" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2218
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<pre style="margin: 0;">-<span id="LC2218" 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="LC2219" class="line" lang="haskell"></span>
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2220
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2247
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<pre style="margin: 0;"> <span id="LC2247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider an implication</span></span>
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2248
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<pre style="margin: 0;"> <span id="LC2248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> beta => alpha ~ Int</span></span>
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2249
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<pre style="margin: 0;"> <span id="LC2249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where beta is a unification variable that has already been unified</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">@@ -2245,23 +2272,38 @@ are some wrinkles:</td>
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2272
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<pre style="margin: 0;"> <span id="LC2272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> beta => ...blah...</span></span>
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2273
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<pre style="margin: 0;"> <span id="LC2273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we still don't know what beta is, we conservatively treat it as potentially</span></span>
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2274
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<pre style="margin: 0;"> <span id="LC2274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> becoming an equality. Hence including 'irreds' in the calculation or has_given_eqs.</span></span>
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<pre style="margin: 0;">+<span id="LC2275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note that we can't really know what's in an irred, so any irred is considered</span></span>
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2276
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<pre style="margin: 0;">+<span id="LC2276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a potential equality.</span></span>
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<pre style="margin: 0;">+<span id="LC2277" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * What about something like forall a b. a ~ F b => [W] c ~ X y z? That Given</span></span>
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<pre style="margin: 0;">+<span id="LC2279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> cannot affect the Wanted, because the Given is entirely *local*: it mentions</span></span>
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<pre style="margin: 0;">+<span id="LC2280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> only skolems bound in the very same implication. Such equalities need not</span></span>
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2281
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<pre style="margin: 0;">+<span id="LC2281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> prevent floating. (Test case typecheck/should_compile/LocalGivenEqs has a</span></span>
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2282
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<pre style="margin: 0;">+<span id="LC2282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> real-life motivating example, with some detailed commentary.) These</span></span>
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2283
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<pre style="margin: 0;">+<span id="LC2283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> equalities are noted with LocalGivenEqs: they do not prevent floating, but</span></span>
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2284
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<pre style="margin: 0;">+<span id="LC2284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> they also are allowed to show up in error messages. See</span></span>
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2285
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<pre style="margin: 0;">+<span id="LC2285" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Suppress redundant givens during error reporting] in GHC.Tc.Errors.</span></span>
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2286
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<pre style="margin: 0;">+<span id="LC2286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The difference between what stops floating and what is suppressed from</span></span>
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2287
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<pre style="margin: 0;">+<span id="LC2287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> error messages is why we need three options for HasGivenEqs.</span></span>
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2288
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<pre style="margin: 0;">+<span id="LC2288" class="line" lang="haskell"></span>
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2289
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<pre style="margin: 0;">+<span id="LC2289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> There is also a simpler case that triggers this behaviour:</span></span>
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2248
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2290
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<pre style="margin: 0;"> <span id="LC2290" class="line" lang="haskell"></span>
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2249
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<pre style="margin: 0;">-<span id="LC2249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * When flattening givens, we generate Given equalities like</span></span>
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2250
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<pre style="margin: 0;">-<span id="LC2250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <F [a]> : F [a] ~ f,</span></span>
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2251
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<pre style="margin: 0;">-<span id="LC2251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with Refl evidence, and we *don't* want those to count as an equality</span></span>
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2252
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<pre style="margin: 0;">-<span id="LC2252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the givens! After all, the entire flattening business is just an</span></span>
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2253
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<pre style="margin: 0;">-<span id="LC2253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> internal matter, and the evidence does not mention any of the 'givens'</span></span>
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2254
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<pre style="margin: 0;">-<span id="LC2254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of this implication. So we do not treat inert_funeqs as a 'given equality'.</span></span>
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2291
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<pre style="margin: 0;">+<span id="LC2291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T where</span></span>
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2292
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<pre style="margin: 0;">+<span id="LC2292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: F a ~ G b => a -> b -> T</span></span>
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2293
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<pre style="margin: 0;">+<span id="LC2293" class="line" lang="haskell"></span>
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2294
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<pre style="margin: 0;">+<span id="LC2294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT _ _) = True</span></span>
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2295
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<pre style="margin: 0;">+<span id="LC2295" class="line" lang="haskell"></span>
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2296
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<pre style="margin: 0;">+<span id="LC2296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Because of this behaviour around local equality givens, we can infer the</span></span>
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2297
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<pre style="margin: 0;">+<span id="LC2297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type of f. This is typecheck/should_compile/LocalGivenEqs2.</span></span>
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2255
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2298
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<pre style="margin: 0;"> <span id="LC2298" class="line" lang="haskell"></span>
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2256
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2299
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<pre style="margin: 0;"> <span id="LC2299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * See Note [Let-bound skolems] for another wrinkle</span></span>
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2300
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<pre style="margin: 0;"> <span id="LC2300" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We do *not* need to worry about representational equalities, because</span></span>
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2259
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<pre style="margin: 0;">-<span id="LC2259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> these do not affect the ability to float constraints.</span></span>
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2301
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<pre style="margin: 0;">+<span id="LC2301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We need not look at the equality relation involved (nominal vs representational),</span></span>
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2302
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<pre style="margin: 0;">+<span id="LC2302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> because representational equalities can still imply nominal ones. For example,</span></span>
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2303
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<pre style="margin: 0;">+<span id="LC2303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if (G a ~R G b) and G's argument's role is nominal, then we can deduce a ~N b.</span></span>
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2260
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2304
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<pre style="margin: 0;"> <span id="LC2304" class="line" lang="haskell"></span>
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2261
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2305
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<pre style="margin: 0;"> <span id="LC2305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Let-bound skolems]</span></span>
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2262
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2306
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<pre style="margin: 0;"> <span id="LC2306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2263
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<pre style="margin: 0;">-<span id="LC2263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"RAE": Update note.</span></span>
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2264
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<pre style="margin: 0;">-<span id="LC2264" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2307" 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="LC2308" 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="LC2309" 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">@@ -2326,20 +2368,22 @@ removeInertCt is ct =</td>
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<pre style="margin: 0;"> <span id="LC2368" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"removeInertCt: CIrredEvCan"</span></span>
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<pre style="margin: 0;"> <span id="LC2369" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CNonCanonical</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"removeInertCt: CNonCanonical"</span></span>
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2370
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<pre style="margin: 0;"> <span id="LC2370" class="line" lang="haskell"></span>
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2329
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<pre style="margin: 0;">-<span id="LC2329" class="line" lang="haskell"><span class="n" style="color: #333;">lookupFlatCache</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</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;">TcS</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;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavourRole</span><span class="p">))</span></span>
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2330
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<pre style="margin: 0;">-<span id="LC2330" class="line" lang="haskell"><span class="n" style="color: #333;">lookupFlatCache</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span></span>
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2331
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<pre style="margin: 0;">-<span id="LC2331" 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="kt" style="color: #458; font-weight: 600;">IS</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_flat_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flat_cache</span></span>
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<pre style="margin: 0;">+<span id="LC2371" class="line" lang="haskell"><span class="cd">-- | Looks up a family application in both the inerts and the famapp-cache</span></span>
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<pre style="margin: 0;">+<span id="LC2372" class="line" lang="haskell"><span class="n" style="color: #333;">lookupFamApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</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;">TcS</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;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavourRole</span><span class="p">))</span></span>
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2373
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<pre style="margin: 0;">+<span id="LC2373" class="line" lang="haskell"><span class="n" style="color: #333;">lookupFamApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span></span>
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2374
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<pre style="margin: 0;">+<span id="LC2374" 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="kt" style="color: #458; font-weight: 600;">IS</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_famapp_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">famapp_cache</span></span>
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2332
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2375
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<pre style="margin: 0;"> <span id="LC2375" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_cans</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IC</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;">inert_funeqs</span> <span class="p">}</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcSInerts</span></span>
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2333
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<td class="diff-line-num new_line" data-linenumber="2376" 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">
2376
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<pre style="margin: 0;"> <span id="LC2376" 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;">firstJusts</span> <span class="p">[</span><span class="n" style="color: #333;">lookup_inerts</span> <span class="n" style="color: #333;">inert_funeqs</span><span class="p">,</span></span>
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2334
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<td class="diff-line-num new_line old" data-linenumber="2377" 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="LC2334" class="line" lang="haskell"> <span class="n" style="color: #333;">lookup_f<span class="idiff left">lats</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">flat</span>_cache</span><span class="p">])</span> <span class="p">}</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2377" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2377
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<pre style="margin: 0;">+<span id="LC2377" class="line" lang="haskell"> <span class="n" style="color: #333;">lookup_f<span class="idiff left">amapps</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">famapp</span>_cache</span><span class="p">])</span> <span class="p">}</span></span>
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2335
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<td class="diff-line-num new_line" data-linenumber="2378" 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">
2378
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<pre style="margin: 0;"> <span id="LC2378" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2336
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<td class="diff-line-num new_line" data-linenumber="2379" 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">
2379
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<pre style="margin: 0;"> <span id="LC2379" class="line" lang="haskell"> <span class="n" style="color: #333;">lookup_inerts</span> <span class="n" style="color: #333;">inert_funeqs</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2337" 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">
2337
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<td class="diff-line-num new_line old" data-linenumber="2380" 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="LC2337" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</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_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev</span><span class="p">,</span> <span class="n" style="color: #333;">cc_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findFunEq</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span></span>
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2380
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<pre style="margin: 0;">+<span id="LC2380" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqualCtList</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_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev</span><span class="p">,</span> <span class="n" style="color: #333;">cc_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">:|</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2381" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2381
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<pre style="margin: 0;">+<span id="LC2381" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findFunEq</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span></span>
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2338
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<td class="diff-line-num new_line" data-linenumber="2382" 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">
2382
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<pre style="margin: 0;"> <span id="LC2382" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvCoercion</span> <span class="n" style="color: #333;">ctev</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="n" style="color: #333;">ctEvFlavourRole</span> <span class="n" style="color: #333;">ctev</span><span class="p">)</span></span>
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2339
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<td class="diff-line-num new_line" data-linenumber="2383" 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">
2383
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<pre style="margin: 0;"> <span id="LC2383" 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;">Nothing</span></span>
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2340
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<td class="diff-line-num new_line" data-linenumber="2384" 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">
2384
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<pre style="margin: 0;"> <span id="LC2384" class="line" lang="haskell"></span>
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2341
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<td class="diff-line-num new_line old" data-linenumber="2385" 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="LC2341" class="line" lang="haskell"> <span class="n" style="color: #333;">lookup_f<span class="idiff left">lats</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">flat</span>_cache</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2342" 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">
2342
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<td class="diff-line-num new_line old" data-linenumber="2385" 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="LC2342" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findFunEq</span> <span class="n" style="color: #333;">f<span class="idiff left right">lat</span>_cache</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span></span>
</pre>
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2385
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<pre style="margin: 0;">+<span id="LC2385" class="line" lang="haskell"> <span class="n" style="color: #333;">lookup_f<span class="idiff left">amapps</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">famapp</span>_cache</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2386" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2386
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<pre style="margin: 0;">+<span id="LC2386" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findFunEq</span> <span class="n" style="color: #333;">f<span class="idiff left right">amapp</span>_cache</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC2387" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Given</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC2388" 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;">Nothing</span></span>
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2389
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<pre style="margin: 0;"> <span id="LC2389" 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">@@ -2841,10 +2885,8 @@ nestImplicTcS ref inner_tclvl (TcS thing_inside)</td>
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2841
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<pre style="margin: 0;"> <span id="LC2885" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_count</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">count</span></span>
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2886
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<pre style="margin: 0;"> <span id="LC2886" class="line" lang="haskell"> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span></span>
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2843
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2887
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<pre style="margin: 0;"> <span id="LC2887" class="line" lang="haskell"> <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="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">readTcRef</span> <span class="n" style="color: #333;">old_inert_var</span></span>
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<pre style="margin: 0;">-<span id="LC2844" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nest_inert</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyInert</span></span>
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<pre style="margin: 0;">-<span id="LC2845" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">inert_cans</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inert_cans</span> <span class="n" style="color: #333;">inerts</span></span>
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2846
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<pre style="margin: 0;">-<span id="LC2846" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_solved_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inert_solved_dicts</span> <span class="n" style="color: #333;">inerts</span> <span class="p">}</span></span>
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2847
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<pre style="margin: 0;">-<span id="LC2847" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not inherit the flat cache]</span></span>
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<pre style="margin: 0;">+<span id="LC2888" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nest_inert</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inerts</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_cycle_breakers</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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<pre style="margin: 0;">+<span id="LC2889" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- all other InertSet fields are inherited</span></span>
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<pre style="margin: 0;"> <span id="LC2890" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_inert_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newTcRef</span> <span class="n" style="color: #333;">nest_inert</span></span>
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2891
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<pre style="margin: 0;"> <span id="LC2891" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_wl_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newTcRef</span> <span class="n" style="color: #333;">emptyWorkList</span></span>
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2892
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<pre style="margin: 0;"> <span id="LC2892" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nest_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcSEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">tcs_ev_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ref</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2865" 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>
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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">@@ -2865,22 +2907,10 @@ nestImplicTcS ref inner_tclvl (TcS thing_inside)</td>
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2907
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<pre style="margin: 0;"> <span id="LC2907" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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2908
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<pre style="margin: 0;"> <span id="LC2908" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">res</span> <span class="p">}</span></span>
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2909
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<pre style="margin: 0;"> <span id="LC2909" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Do not inherit the flat cache]</span></span>
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2869
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<pre style="margin: 0;">-<span id="LC2869" 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="LC2870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do not want to inherit the flat cache when processing nested</span></span>
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<pre style="margin: 0;">-<span id="LC2871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">implications. Consider</span></span>
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<pre style="margin: 0;">-<span id="LC2872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a ~ F b, forall c. b~Int => blah</span></span>
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<pre style="margin: 0;">-<span id="LC2873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we have F b ~ fsk in the flat-cache, and we push that into the</span></span>
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<pre style="margin: 0;">-<span id="LC2874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">nested implication, we might miss that F b can be rewritten to F Int,</span></span>
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<pre style="margin: 0;">-<span id="LC2875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and hence perhaps solve it. Moreover, the fsk from outside is</span></span>
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<pre style="margin: 0;">-<span id="LC2876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">flattened out after solving the outer level, but and we don't</span></span>
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<pre style="margin: 0;">-<span id="LC2877" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">do that flattening recursively.</span></span>
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<pre style="margin: 0;">-<span id="LC2878" 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="LC2879" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2910" class="line" lang="haskell"><span class="n" style="color: #333;">nestTcS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="n" style="color: #333;">a</span></span>
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2911
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<pre style="margin: 0;"> <span id="LC2911" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Use the current untouchables, augmenting the current</span></span>
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<pre style="margin: 0;"> <span id="LC2912" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- evidence bindings, and solved dictionaries</span></span>
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<pre style="margin: 0;">-<span id="LC2883" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- But have no effect on the InertCans, or on the inert_f<span class="idiff left right">lat</span>_cache</span></span>
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<pre style="margin: 0;">+<span id="LC2913" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- But have no effect on the InertCans, or on the inert_f<span class="idiff left right">amapp</span>_cache</span></span>
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2884
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<pre style="margin: 0;"> <span id="LC2914" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (we want to inherit the latter from processing the Givens)</span></span>
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2915
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<pre style="margin: 0;"> <span id="LC2915" class="line" lang="haskell"><span class="n" style="color: #333;">nestTcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="n" style="color: #333;">thing_inside</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2916" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">env</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcSEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">tcs_inerts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inerts_var</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">-></span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3168" 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>
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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">@@ -3168,15 +3198,15 @@ zonkTyCoVarKind :: TcTyCoVar -> TcS TcTyCoVar</td>
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<pre style="margin: 0;"> <span id="LC3198" class="line" lang="haskell"><span class="n" style="color: #333;">zonkTyCoVarKind</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrapTcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">zonkTyCoVarKind</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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3199
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<pre style="margin: 0;"> <span id="LC3199" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3200" 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="LC3171" class="line" lang="haskell"><span class="n" style="color: #333;">extendF<span class="idiff left right">lat</span>Cache</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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3172
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<pre style="margin: 0;">-<span id="LC3172" class="line" lang="haskell"><span class="n" style="color: #333;">extendF<span class="idiff left right">lat</span>Cache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xi_args</span> <span class="n" style="color: #333;">stuff</span><span class="o" 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;">ty</span><span class="p">)</span></span>
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3201
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<pre style="margin: 0;">+<span id="LC3201" class="line" lang="haskell"><span class="n" style="color: #333;">extendF<span class="idiff left right">amApp</span>Cache</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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3202
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<pre style="margin: 0;">+<span id="LC3202" class="line" lang="haskell"><span class="n" style="color: #333;">extendF<span class="idiff left right">amApp</span>Cache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xi_args</span> <span class="n" style="color: #333;">stuff</span><span class="o" 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;">ty</span><span class="p">)</span></span>
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3173
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3203
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<pre style="margin: 0;"> <span id="LC3203" 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;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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3174
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<pre style="margin: 0;">-<span id="LC3174" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_F<span class="idiff left right">lat</span>Cache</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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3175
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<pre style="margin: 0;">-<span id="LC3175" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"extendF<span class="idiff left right">lat</span>Cache"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xi_args</span></span>
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3176
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<pre style="margin: 0;">-<span id="LC3176" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span> <span class="p">])</span></span>
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3204
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<pre style="margin: 0;">+<span id="LC3204" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_F<span class="idiff left right">amApp</span>Cache</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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3205
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<pre style="margin: 0;">+<span id="LC3205" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"extendF<span class="idiff left right">amApp</span>Cache"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xi_args</span></span>
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<pre style="margin: 0;">+<span id="LC3206" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span> <span class="p">])</span></span>
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3177
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3207
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<pre style="margin: 0;"> <span id="LC3207" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'co' can be bottom, in the case of derived items</span></span>
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3178
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<pre style="margin: 0;">-<span id="LC3178" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">updInertTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">is</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IS</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_f<span class="idiff left right">lat</span>_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fc</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">-></span></span>
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3179
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<pre style="margin: 0;">-<span id="LC3179" class="line" lang="haskell"> <span class="n" style="color: #333;">is</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_f<span class="idiff left right">lat</span>_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insertFunEq</span> <span class="n" style="color: #333;">fc</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xi_args</span> <span class="n" style="color: #333;">stuff</span> <span class="p">}</span> <span class="p">}</span> <span class="p">}</span></span>
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3208
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<pre style="margin: 0;">+<span id="LC3208" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">updInertTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">is</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IS</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_f<span class="idiff left right">amapp</span>_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fc</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">-></span></span>
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3209
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<pre style="margin: 0;">+<span id="LC3209" class="line" lang="haskell"> <span class="n" style="color: #333;">is</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_f<span class="idiff left right">amapp</span>_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insertFunEq</span> <span class="n" style="color: #333;">fc</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xi_args</span> <span class="n" style="color: #333;">stuff</span> <span class="p">}</span> <span class="p">}</span> <span class="p">}</span></span>
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3180
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3210
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<pre style="margin: 0;"> <span id="LC3210" class="line" lang="haskell"></span>
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3181
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3211
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<pre style="margin: 0;"> <span id="LC3211" class="line" lang="haskell"><span class="n" style="color: #333;">pprKicked</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;">SDoc</span></span>
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3182
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3212
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<pre style="margin: 0;"> <span id="LC3212" class="line" lang="haskell"><span class="n" style="color: #333;">pprKicked</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#c69ed1e399ce62d9f23fc51d2806dab1d9b7bfd6"><strong>docs/users_guide/expected-undocumented-flags.txt</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">@@ -70,7 +70,6 @@</td>
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70
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70
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext">-fextended-default-rules</span>
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71
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71
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext">-fffi</span>
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72
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72
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="plaintext">-ffi</span>
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73
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<pre style="margin: 0;">-<span id="LC73" class="line" lang="plaintext">-fflat-cache</span>
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74
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73
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="plaintext">-ffloat-all-lams</span>
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75
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74
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="plaintext">-ffloat-lam-args</span>
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76
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75
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="plaintext">-ffrontend-opt</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#e72e1315ef8d24f4072dd823e6b645eb886fbe4a"><strong>docs/users_guide/exts/type_families.rst</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">@@ -581,6 +581,51 @@ If the option :extension:`UndecidableInstances` is passed to the compiler, the</td>
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581
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581
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="plaintext">above restrictions are not enforced and it is on the programmer to ensure</span>
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582
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582
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="plaintext">termination of the normalisation of type families during type inference.</span>
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583
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583
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="plaintext">Reducing type family applications</span>
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585
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="plaintext">.. ghc-flag:: -ffamily-application-cache</span>
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="plaintext"> :shortdesc: Use a cache when reducing type family applications</span>
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589
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<pre style="margin: 0;">+<span id="LC589" class="line" lang="plaintext"> :type: dynamic</span>
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590
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<pre style="margin: 0;">+<span id="LC590" class="line" lang="plaintext"> :reverse: -fno-family-application-cache</span>
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591
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="plaintext"> :category:</span>
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="plaintext"> The flag :ghc-flag:`-ffamily-application-cache` (on by default) instructs</span>
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="plaintext"> GHC to use a cache when reducing type family applications. In most cases,</span>
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="plaintext"> this will speed up compilation. The use of this flag will not affect</span>
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596
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="plaintext"> runtime behaviour.</span>
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597
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="plaintext"></span>
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598
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="plaintext">When GHC encounters a type family application (like ``F Int a``) in a program,</span>
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599
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<pre style="margin: 0;">+<span id="LC599" class="line" lang="plaintext">it must often reduce it in order to complete type checking. Here is a simple</span>
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600
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<pre style="margin: 0;">+<span id="LC600" class="line" lang="plaintext">example::</span>
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601
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="plaintext"></span>
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602
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<pre style="margin: 0;">+<span id="LC602" class="line" lang="plaintext"> type family F a where</span>
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603
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="plaintext"> F Int = Bool</span>
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604
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="plaintext"> F (Maybe Double) = Char</span>
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605
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="plaintext"></span>
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606
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="plaintext"> g :: F Int -> Bool</span>
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607
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="plaintext"> g = not</span>
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608
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="plaintext"></span>
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609
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="plaintext">Despite the fact that ``g``\'s type mentions ``F Int``, GHC must recognize that</span>
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610
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<pre style="margin: 0;">+<span id="LC610" class="line" lang="plaintext">``g``\'s argument really has type ``Bool``. This is done by *reducing* ``F Int``</span>
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611
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<pre style="margin: 0;">+<span id="LC611" class="line" lang="plaintext">to become ``Bool``. Sometimes, there is not enough information to reduce a type</span>
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612
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<pre style="margin: 0;">+<span id="LC612" class="line" lang="plaintext">family application; we say such an application is *stuck*. Continuing this example,</span>
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613
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<pre style="margin: 0;">+<span id="LC613" class="line" lang="plaintext">an occurrence of ``F (Maybe a)`` (for some type variable ``a``) would be stuck, as</span>
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614
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="plaintext">no equation applies.</span>
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615
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<pre style="margin: 0;">+<span id="LC615" class="line" lang="plaintext"></span>
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616
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<pre style="margin: 0;">+<span id="LC616" class="line" lang="plaintext">During type checking, GHC uses heuristics to determine which type family application</span>
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617
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="plaintext">to reduce next; there is no predictable ordering among different type family applications.</span>
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618
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<pre style="margin: 0;">+<span id="LC618" class="line" lang="plaintext">The non-determinism rarely matters in practice. In most programs, type family reduction</span>
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619
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<pre style="margin: 0;">+<span id="LC619" class="line" lang="plaintext">terminates, and so these choices are immaterial. However, if a type family application</span>
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620
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="plaintext">does not terminate, it is possible that type-checking may unpredictably diverge. (GHC</span>
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="plaintext">will always take the same path for a given source program, but small changes in that</span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="plaintext">source program may induce GHC to take a different path. Compiling a given, unchanged</span>
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="plaintext">source program is still deterministic.)</span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="plaintext">In order to speed up type family reduction, GHC normally uses a cache, remembering what</span>
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="plaintext">type family applications it has previously reduced. This feature can be disabled with</span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="plaintext">:ghc-flag:`-fno-family-application-cache`.</span>
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="plaintext">.. _type-wildcards-lhs:</span>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="plaintext">Wildcards on the LHS of data and type family instances</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#450c4d136f7e999d04363e35060e5ea43ab3aac5"><strong>testsuite/tests/indexed-types/should_fail/T13784.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T13784.hs:29:28: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘as’ with ‘a : Divide a as’</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Could not deduce: as ~ (a : Divide a as)</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> from the context: (a : as) ~ (a1 : as1)</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> bound by a pattern with constructor:</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> :* :: forall a (as :: [*]). a -> Product as -> Product (a : as),</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> in an equation for ‘divide’</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> at T13784.hs:29:13-19</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> Expected: Product (Divide a (a : as))</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> Actual: Product as1</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> ‘as’ is a rigid type variable bound by</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#31dd222895d4f077f4769c6b6b7302983c4402e7"><strong>testsuite/tests/patsyn/should_fail/T11010.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T11010.hs:9:36: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘a1’ with ‘Int’</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Could not deduce: a1 ~ Int</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> from the context: a ~ Int</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> bound by the signature for pattern synonym ‘IntFun’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> at T11010.hs:9:9-14</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> Expected: a -> b</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> Actual: a1 -> b</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> ‘a1’ is a rigid type variable bound by</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#d5faea44a771b5950df6244ebeb7a33b28089d2b"><strong>testsuite/tests/typecheck/should_compile/LocalGivenEqs.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes, TypeFamilies, FlexibleInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-missing-methods -Wno-unused-matches #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">LocalGivenEqs</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [When does an implication have given equalities?] in GHC.Tc.Solver.Monad;</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- this tests custom treatment for LocalGivenEqs</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" 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="LC10" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">I (Richard E) tried somewhat half-heartedly to minimize this, but failed.</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key bit is the use of the ECP constructor inside the lambda in happyReduction_508.</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(The lack of a type signature on that is not at issue, I believe.) The type</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of ECP is</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (forall b. DisambECP b => PV (Located b)) -> ECP</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So, the argument to ECP gets a [G] DisambECP b, which (via its superclass) grants</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">us [G] b ~ (Body b) GhcPs. In order to infer the type of happy_var_2, we need to</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">float some wanted out past this equality. We have Note [Let-bound skolems]</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in GHC.Tc.Solver.Monad to consider this Given equality to be let-like, and thus</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not prevent floating. But, note that the equality isn't quite let-like, because</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it mentions b in its RHS. It thus triggers Note [Type variable cycles in Givens]</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in GHC.Tc.Solver.Canonical. That Note says we change the situation to</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] b ~ cbv GhcPs</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] Body b ~ cbv</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for some fresh CycleBreakerTv cbv. Now, our original equality looks to be let-like,</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but the new cbv equality is *not* let-like -- note that the variable is on the RHS.</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The solution is to consider any equality whose free variables are all at the current</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">level to not stop equalities from floating. These are called *local*. Because both</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Givens are local in this way, they no longer prevent floating, and we can type-check</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this example.</span></span>
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<pre style="margin: 0;">+<span id="LC30" 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="LC31" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Any</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">infixr</span> <span class="mi" style="color: #099;">9</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">HappyStk</span><span class="p">`</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HappyStk</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HappyStk</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HappyStk</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">HappyWrap201</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HappyWrap201</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ECP</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">HappyWrap205</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HappyWrap205</span> <span class="p">(([</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Token</span><span class="p">],</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">HappyAbsSyn</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HappyAbsSyn</span> <span class="kt" style="color: #458; font-weight: 600;">HappyAny</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">HappyAny</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Any</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="p">{</span> <span class="n" style="color: #333;">unECP</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">DisambECP</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">PV</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PV</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Token</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">AnnKeywordId</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AnnIf</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AnnThen</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AnnElse</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AnnSemi</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">AddAnn</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Body</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">DisambECP</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Body</span> <span class="n" style="color: #333;">b</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;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsIfPV</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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61
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- semicolon?</span></span>
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62
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span></span>
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63
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- semicolon?</span></span>
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64
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span></span>
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65
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PV</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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66
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"></span>
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67
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">DisambECP</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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68
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Body</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span></span>
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69
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsIfPV</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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70
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"></span>
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71
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Functor</span> <span class="kt" style="color: #458; font-weight: 600;">P</span></span>
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72
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Applicative</span> <span class="kt" style="color: #458; font-weight: 600;">P</span></span>
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73
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="kt" style="color: #458; font-weight: 600;">P</span></span>
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74
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"></span>
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75
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Functor</span> <span class="kt" style="color: #458; font-weight: 600;">PV</span></span>
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76
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Applicative</span> <span class="kt" style="color: #458; font-weight: 600;">PV</span></span>
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77
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="kt" style="color: #458; font-weight: 600;">PV</span></span>
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78
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"></span>
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79
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"><span class="n" style="color: #333;">mj</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnnKeywordId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AddAnn</span></span>
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80
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"><span class="n" style="color: #333;">mj</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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81
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"></span>
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82
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"><span class="n" style="color: #333;">amms</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">AddAnn</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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83
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"><span class="n" style="color: #333;">amms</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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84
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"></span>
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85
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="n" style="color: #333;">happyIn208</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HappyAbsSyn</span></span>
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86
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"><span class="n" style="color: #333;">happyIn208</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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87
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"></span>
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88
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"><span class="n" style="color: #333;">happyReturn</span> <span class="o" style="font-weight: 600;">::</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="n" style="color: #333;">a</span></span>
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89
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"><span class="n" style="color: #333;">happyReturn</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">return</span><span class="p">)</span></span>
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90
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"></span>
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91
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"><span class="n" style="color: #333;">happyThen</span> <span class="o" style="font-weight: 600;">::</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="n" style="color: #333;">b</span></span>
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92
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"><span class="n" style="color: #333;">happyThen</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">>>=</span><span class="p">)</span></span>
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93
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"></span>
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94
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"><span class="n" style="color: #333;">comb2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span></span>
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95
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"><span class="n" style="color: #333;">comb2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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96
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"></span>
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97
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="n" style="color: #333;">runPV</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PV</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="n" style="color: #333;">a</span></span>
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98
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"><span class="n" style="color: #333;">runPV</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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99
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"></span>
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100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="n" style="color: #333;">happyOutTok</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HappyAbsSyn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Token</span></span>
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<td class="diff-line-num new new_line" data-linenumber="101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="n" style="color: #333;">happyOutTok</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"></span>
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103
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="n" style="color: #333;">happyOut201</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HappyAbsSyn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HappyWrap201</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="n" style="color: #333;">happyOut201</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"></span>
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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"><span class="n" style="color: #333;">happyOut205</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HappyAbsSyn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HappyWrap205</span></span>
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107
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"><span class="n" style="color: #333;">happyOut205</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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108
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"></span>
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109
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="n" style="color: #333;">happyReduction_508</span> <span class="p">(</span><span class="n" style="color: #333;">happy_x_8</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">HappyStk</span><span class="p">`</span></span>
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110
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"> <span class="n" style="color: #333;">happy_x_7</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">HappyStk</span><span class="p">`</span></span>
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111
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"> <span class="n" style="color: #333;">happy_x_6</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">HappyStk</span><span class="p">`</span></span>
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112
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"> <span class="n" style="color: #333;">happy_x_5</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">HappyStk</span><span class="p">`</span></span>
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113
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"> <span class="n" style="color: #333;">happy_x_4</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">HappyStk</span><span class="p">`</span></span>
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114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"> <span class="n" style="color: #333;">happy_x_3</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">HappyStk</span><span class="p">`</span></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"> <span class="n" style="color: #333;">happy_x_2</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">HappyStk</span><span class="p">`</span></span>
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116
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="n" style="color: #333;">happy_x_1</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">HappyStk</span><span class="p">`</span></span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"> <span class="n" style="color: #333;">happyRest</span><span class="p">)</span> <span class="n" style="color: #333;">tk</span></span>
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118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">happyThen</span> <span class="p">((</span><span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">happyOutTok</span> <span class="n" style="color: #333;">happy_x_1</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="n" style="color: #333;">happy_var_1</span> <span class="o" style="font-weight: 600;">-></span></span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">happyOut201</span> <span class="n" style="color: #333;">happy_x_2</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HappyWrap201</span> <span class="n" style="color: #333;">happy_var_2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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120
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">happyOut205</span> <span class="n" style="color: #333;">happy_x_3</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HappyWrap205</span> <span class="n" style="color: #333;">happy_var_3</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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121
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">happyOutTok</span> <span class="n" style="color: #333;">happy_x_4</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="n" style="color: #333;">happy_var_4</span> <span class="o" style="font-weight: 600;">-></span></span>
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122
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">happyOut201</span> <span class="n" style="color: #333;">happy_x_5</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HappyWrap201</span> <span class="n" style="color: #333;">happy_var_5</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">happyOut205</span> <span class="n" style="color: #333;">happy_x_6</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HappyWrap205</span> <span class="n" style="color: #333;">happy_var_6</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">happyOutTok</span> <span class="n" style="color: #333;">happy_x_7</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="n" style="color: #333;">happy_var_7</span> <span class="o" style="font-weight: 600;">-></span></span>
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125
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">happyOut201</span> <span class="n" style="color: #333;">happy_x_8</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HappyWrap201</span> <span class="n" style="color: #333;">happy_var_8</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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126
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- uncomment this next signature to avoid the need</span></span>
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127
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for special treatment of floating described above</span></span>
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128
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"> <span class="p">(</span> <span class="n" style="color: #333;">runPV</span> <span class="p">(</span><span class="n" style="color: #333;">unECP</span> <span class="n" style="color: #333;">happy_var_2</span> <span class="cm" style="color: #998; font-style: italic;">{- :: PV (LHsExpr GhcPs) -}</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">happy_var_2</span> <span class="o" style="font-weight: 600;">-></span></span>
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129
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">$</span></span>
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130
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="haskell"> <span class="n" style="color: #333;">unECP</span> <span class="n" style="color: #333;">happy_var_5</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">happy_var_5</span> <span class="o" style="font-weight: 600;">-></span></span>
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131
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"> <span class="n" style="color: #333;">unECP</span> <span class="n" style="color: #333;">happy_var_8</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">happy_var_8</span> <span class="o" style="font-weight: 600;">-></span></span>
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132
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"> <span class="n" style="color: #333;">amms</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsIfPV</span> <span class="p">(</span><span class="n" style="color: #333;">comb2</span> <span class="n" style="color: #333;">happy_var_1</span> <span class="n" style="color: #333;">happy_var_8</span><span class="p">)</span> <span class="n" style="color: #333;">happy_var_2</span> <span class="p">(</span><span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">happy_var_3</span><span class="p">)</span> <span class="n" style="color: #333;">happy_var_5</span> <span class="p">(</span><span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">happy_var_6</span><span class="p">)</span> <span class="n" style="color: #333;">happy_var_8</span><span class="p">)</span></span>
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133
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnIf</span> <span class="n" style="color: #333;">happy_var_1</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnThen</span> <span class="n" style="color: #333;">happy_var_4</span></span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnElse</span> <span class="n" style="color: #333;">happy_var_7</span></span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span><span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnSemi</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">happy_var_3</span><span class="p">))</span></span>
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136
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">++</span><span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnSemi</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">happy_var_6</span><span class="p">))))}}}}}}}})</span></span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"> <span class="p">)</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">happyReturn</span> <span class="p">(</span><span class="n" style="color: #333;">happyIn208</span> <span class="n" style="color: #333;">r</span><span class="p">))</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#780007b4b21071a8dbf28e54b71aac4e0f3a4b31"><strong>testsuite/tests/typecheck/should_compile/LocalGivenEqs2.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies, GADTSyntax, ExistentialQuantification #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is a simple case that exercises the LocalGivenEqs bullet</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of Note [When does an implication have given equalities?] in GHC.Tc.Solver.Monad</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If a future change rejects this, that's not the end of the world, but it's nice</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to be able to infer `f`.</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">LocalGivenEqs2</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">G</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~</span> <span class="kt" style="color: #458; font-weight: 600;">G</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="kr" 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="kt" style="color: #458; font-weight: 600;">True</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/86418442e025aa6e00f752bd65b67b40b66326db...e2ec2adab5f5af4756b0769dd8af8eb192700c05#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</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">@@ -726,3 +726,5 @@ test('T15942', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC726" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">CbvOverlap</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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727
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727
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<pre style="margin: 0;"> <span id="LC727" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">InstanceGivenOverlap</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC728" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">InstanceGivenOverlap2</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC729" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LocalGivenEqs</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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730
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LocalGivenEqs2</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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