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<h3>
Richard Eisenberg pushed to branch wip/derived-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/3e5514ec8a2567dec529d01faf35da3b5501ad23">3e5514ec</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-06-19T11:54:15+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't produce Deriveds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f5433f0bc06f65deb96a44b62d47875ec4bc5b38">f5433f0b</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-06-19T23:54:41+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Checkpoint. Want more CI.
</pre>
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<h4>23 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
compiler/GHC/Tc/Errors.hs
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<li class="file-stats">
<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<li class="file-stats">
<a href="#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
compiler/GHC/Tc/Solver/Interact.hs
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<li class="file-stats">
<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<li class="file-stats">
<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<li class="file-stats">
<a href="#93bba9b9e0195db135fec54160523a427ea042fd">
compiler/GHC/Tc/Types/Origin.hs
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<li class="file-stats">
<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">
compiler/GHC/Tc/Utils/TcMType.hs
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<li class="file-stats">
<a href="#31fcb928c5966c783c0b5c6b2ef7a897b58e4daa">
testsuite/tests/indexed-types/should_fail/SimpleFail16.stderr
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<li class="file-stats">
<a href="#450c4d136f7e999d04363e35060e5ea43ab3aac5">
testsuite/tests/indexed-types/should_fail/T13784.stderr
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<li class="file-stats">
<a href="#fdad8ca739f3d61752da4e6fec4e8e7e5604fb9a">
testsuite/tests/partial-sigs/should_compile/T10403.stderr
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<li class="file-stats">
<a href="#ac122c96475dd685d19229121246af1623ce5aa8">
testsuite/tests/polykinds/T11142.stderr
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<li class="file-stats">
<a href="#580bc848e0ce06fa5fde84bbd40dbbcc7bbf3518">
testsuite/tests/polykinds/T12444.stderr
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<li class="file-stats">
<a href="#f6f3fe949a2cbc72ebd9c2a22b3067595b1831a9">
testsuite/tests/polykinds/T14172.stderr
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<li class="file-stats">
<a href="#778f16c490e0368e143014f33761355a3acb23e5">
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testsuite/tests/typecheck/should_compile/FunDepOrigin1.hs
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<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<li class="file-stats">
<a href="#f72282051f998cf10c629b48eaa08cc0a6e3dd08">
testsuite/tests/typecheck/should_compile/hole_constraints.stderr
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<li class="file-stats">
<a href="#98324bfd33fc7908f03dbee94a5e8bd5c72ea545">
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testsuite/tests/typecheck/should_fail/FunDepOrigin1b.hs
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<li class="file-stats">
<a href="#769a20b7cf6a476e32366a570555eea2cea37bd2">
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testsuite/tests/typecheck/should_fail/FunDepOrigin1b.stderr
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<a href="#a65a3ee62514972c41618851c54e682121851e89">
testsuite/tests/typecheck/should_fail/T14325.stderr
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<li class="file-stats">
<a href="#4a61fc1c319324b4178596746c12f7efdf560697">
testsuite/tests/typecheck/should_fail/T15767.stderr
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<li class="file-stats">
<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">
testsuite/tests/typecheck/should_fail/all.T
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<li class="file-stats">
<a href="#6544261c560cd0344b7a1682b390319089d5b1cb">
testsuite/tests/typecheck/should_fail/tcfail204.stderr
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<h4>Changes:</h4>
<li id="e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76"><strong>compiler/GHC/Tc/Errors.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_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">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -22,7 +22,8 @@ import GHC.Tc.Utils.Monad</td>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Constraint</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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<td class="diff-line-num new_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="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Predicate</span></span>
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<td class="diff-line-num old_line" data-linenumber="24" 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="24" 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="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span></span>
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<td class="diff-line-num new_line old" data-linenumber="25" 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="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span><span class="p">(</span> <span class="n" style="color: #333;">occCheckForErrors</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="n" style="color: #333;">swapOverTyVars</span> <span class="p">)</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="26" 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="25" 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="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span><span class="p">(</span> <span class="n" style="color: #333;">occCheckForErrors</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="n" style="color: #333;">swapOverTyVars</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="26" 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="26" 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="LC26" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">canSolveByUnification</span> <span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="26" 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="27" 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="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span><span class="p">(</span> <span class="n" style="color: #333;">tcInitTidyEnv</span> <span class="p">)</span></span>
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<td class="diff-line-num new_line" data-linenumber="28" 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="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span></span>
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<td class="diff-line-num old_line" data-linenumber="28" 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="29" 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="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Origin</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="45" 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="46" 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">@@ -45,11 +46,12 @@ import GHC.Tc.Types.EvTerm</td>
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<td class="diff-line-num new_line" data-linenumber="46" 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="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.Binds</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">PatSynBind</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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<td class="diff-line-num new_line" data-linenumber="47" 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="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<td class="diff-line-num new_line" data-linenumber="48" 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="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Reader</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">lookupGRE_Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GlobalRdrEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkRdrUnqual</span> <span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="48" 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="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span><span class="idiff left"> </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">typeableClassName</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">)</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="49" 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="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Set</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Set</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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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.Utils.Error</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">errDoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprLocErrMsg</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">@@ -234,7 +236,8 @@ report_unsolved type_errors expr_holes</td>
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #15539 and c.f. setting ic_status</span></span>
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Solver.setImplicationStatus</span></span>
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<pre style="margin: 0;"> <span id="LC238" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_warn_redundant</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">warn_redundant</span></span>
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<pre style="margin: 0;">-<span id="LC237" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binds_var</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binds_var</span></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_already_reported</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyUniqSet</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC241" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">reportWanteds</span> <span class="n" style="color: #333;">err_ctxt</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">wanted</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="345" 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">@@ -342,6 +345,8 @@ data ReportErrCtxt</td>
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<pre style="margin: 0;"> <span id="LC345" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so create bindings if need be, but</span></span>
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<pre style="margin: 0;"> <span id="LC346" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- don't issue any more errors/warnings</span></span>
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<pre style="margin: 0;"> <span id="LC347" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing error messages]</span></span>
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_already_reported</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UniqSet</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Avoid reporting duplicates]</span></span>
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"> <span class="p">}</span></span>
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351
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"></span>
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352
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="kr" style="font-weight: 600;">where</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">@@ -535,6 +540,8 @@ data ErrorItem</td>
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<pre style="margin: 0;"> <span id="LC540" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_evdest</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;">TcEvDest</span> <span class="c1" style="color: #998; font-style: italic;">-- for Wanteds, where to put evidence</span></span>
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span></span>
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<pre style="margin: 0;"> <span id="LC542" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_unique</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span></span>
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for deduplication; see Note [Avoid reporting duplicates]</span></span>
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span> <span class="kr" style="font-weight: 600;">where</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">@@ -553,17 +560,19 @@ mkErrorItem ct = EI { ei_pred = tyvar_first pred</td>
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<pre style="margin: 0;"> <span id="LC560" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_evdest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m_evdest</span></span>
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctFlavour</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC556" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_unique</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unique</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLoc</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">m_evdest</span><span class="p">,</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">m_evdest</span><span class="p">,</span> <span class="n" style="color: #333;">pred</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">unique</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span></span>
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span></span>
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562
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570
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_pred</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span></span>
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563
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<pre style="margin: 0;">-<span id="LC563" 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;">Just</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">ctPredToReport</span> <span class="n" style="color: #333;">ct_pred</span> <span class="n" style="color: #333;">report_as</span><span class="p">)</span></span>
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571
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<pre style="margin: 0;">+<span id="LC571" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctPredToReport</span> <span class="n" style="color: #333;">dest</span> <span class="n" style="color: #333;">ct_pred</span> <span class="n" style="color: #333;">report_as</span></span>
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<pre style="margin: 0;">+<span id="LC572" 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;">Just</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">u</span><span class="p">)</span></span>
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573
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC574" 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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<pre style="margin: 0;">-<span id="LC566" 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;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC575" 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;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ct</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We reorient any tyvar equalities to put the tyvar first; this</span></span>
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- allows fewer cases when choosing how to treat errors. Forgetting</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">@@ -636,13 +645,17 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">reportHoles</span> <span class="n" style="color: #333;">tidy_items</span> <span class="n" style="color: #333;">ctxt_for_insols</span> <span class="n" style="color: #333;">other_holes</span></span>
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<pre style="margin: 0;"> <span id="LC646" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- holes never suppress</span></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC639" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt1</span><span class="p">,</span> <span class="n" style="color: #333;">items1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tryReporters</span> <span class="n" style="color: #333;">ctxt_for_insols</span> <span class="n" style="color: #333;">report1</span> <span class="n" style="color: #333;">tidy_items</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing confusing errors]</span></span>
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<pre style="margin: 0;">+<span id="LC649" 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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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">suppressed_items</span><span class="p">,</span> <span class="n" style="color: #333;">items0</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="p">(</span><span class="n" style="color: #333;">suppress</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">tidy_items</span></span>
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"reportWanteds suppressed:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">suppressed_items</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt1</span><span class="p">,</span> <span class="n" style="color: #333;">items1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tryReporters</span> <span class="n" style="color: #333;">ctxt_for_insols</span> <span class="n" style="color: #333;">report1</span> <span class="n" style="color: #333;">items0</span></span>
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<pre style="margin: 0;"> <span id="LC653" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now all the other constraints. We suppress errors here if</span></span>
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<pre style="margin: 0;"> <span id="LC655" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- any of the first batch failed, or if the enclosing context</span></span>
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<pre style="margin: 0;"> <span id="LC656" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- says to suppress</span></span>
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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ctxt2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">{</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt1</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC645" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="kr" style="font-weight: 600;"><span class="idiff left right">_</span></span><span class="p">,</span> <span class="n" style="color: #333;">leftovers</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tryReporters</span> <span class="n" style="color: #333;">ctxt2</span> <span class="n" style="color: #333;">report2</span> <span class="n" style="color: #333;">items1</span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ctxt2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt<span class="idiff left right">1</span></span> <span class="p">{</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt1</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">ctxt3</span></span><span class="p">,</span> <span class="n" style="color: #333;">leftovers</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tryReporters</span> <span class="n" style="color: #333;">ctxt2</span> <span class="n" style="color: #333;">report2</span> <span class="n" style="color: #333;">items1</span></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">MASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">leftovers</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">leftovers</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC660" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC661" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- All the Derived ones have been filtered out of simples</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">@@ -650,49 +663,79 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to report unsolved Derived goals as errors</span></span>
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not report derived but soluble errors]</span></span>
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<pre style="margin: 0;"> <span id="LC665" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC653" class="line" lang="haskell"> <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mapBagM_</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">reportImplic</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt2</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">implics</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">;</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inner_ctxt</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">ctxt2</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cec_already_reported</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">cec_already_reported</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ctxt3</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC667" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB ctxt2: don't suppress inner insolubles if there's only a</span></span>
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<pre style="margin: 0;"> <span id="LC668" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wanted insoluble here; but do suppress inner insolubles</span></span>
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<pre style="margin: 0;"> <span id="LC669" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if there's a *given* insoluble here (= inaccessible code)</span></span>
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<pre style="margin: 0;">+<span id="LC670" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapBagM_</span> <span class="p">(</span><span class="n" style="color: #333;">reportImplic</span> <span class="n" style="color: #333;">inner_ctxt</span><span class="p">)</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC673" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Only now, if there are no errors, do we report suppressed ones</span></span>
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<pre style="margin: 0;">+<span id="LC674" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing confusing errors]</span></span>
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<pre style="margin: 0;">+<span id="LC675" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't need to update the context further because of the</span></span>
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- whenNoErrs guard</span></span>
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<pre style="margin: 0;">+<span id="LC677" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">whenNoErrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC678" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">more_leftovers</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tryReporters</span> <span class="n" style="color: #333;">ctxt3</span> <span class="n" style="color: #333;">report3</span> <span class="n" style="color: #333;">suppressed_items</span></span>
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">MASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">more_leftovers</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">more_leftovers</span> <span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC680" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cec_tidy</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;"> <span id="LC682" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_items</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bagToList</span> <span class="p">(</span><span class="n" style="color: #333;">mapBag</span> <span class="p">(</span><span class="n" style="color: #333;">mkErrorItem</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">tidyCt</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC683" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bagToList</span> <span class="p">(</span><span class="n" style="color: #333;">mapBag</span> <span class="p">(</span><span class="n" style="color: #333;">tidyHole</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">holes</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC684" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing confusing errors]</span></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"> <span class="n" style="color: #333;">suppress</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;">ErrorItem</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="haskell"> <span class="n" style="color: #333;">suppress</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">badCoercionHole</span> <span class="n" style="color: #333;">pred</span></span>
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689
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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690
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"></span>
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691
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Equalities with incompatible kinds] in GHC.Tc.Solver.Canonical;</span></span>
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692
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- point (4c)</span></span>
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693
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<pre style="margin: 0;">+<span id="LC693" 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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ty1</span><span class="p">,</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getEqPredTys_maybe</span> <span class="n" style="color: #333;">pred</span></span>
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694
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTyVar_maybe</span> <span class="n" style="color: #333;">ty1</span></span>
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695
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">canSolveByUnification</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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696
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">occCheckForErrors</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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697
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this last line checks for e.g. impredicative situations; we don't</span></span>
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698
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- want to suppress an error if the problem is impredicativity</span></span>
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699
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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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700
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell"></span>
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701
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<pre style="margin: 0;">+<span id="LC701" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_ww_fundep_item</span> <span class="n" style="color: #333;">item</span></span>
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702
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<pre style="margin: 0;">+<span id="LC702" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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703
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"></span>
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704
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<pre style="margin: 0;">+<span id="LC704" 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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705
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<pre style="margin: 0;">+<span id="LC705" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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706
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<pre style="margin: 0;">+<span id="LC706" class="line" lang="haskell"></span>
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662
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707
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- report1: ones that should *not* be suppressed by</span></span>
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663
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708
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- an insoluble somewhere else in the tree</span></span>
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664
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709
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<pre style="margin: 0;"> <span id="LC709" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's crucial that anything that is considered insoluble</span></span>
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665
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710
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (see GHC.Tc.Utils.insolubleCt) is caught here, otherwise</span></span>
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666
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711
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<pre style="margin: 0;"> <span id="LC711" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we might suppress its error message, and proceed on past</span></span>
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type checking to get a Lint error later</span></span>
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<pre style="margin: 0;">-<span id="LC668" class="line" lang="haskell"> <span class="n" style="color: #333;">report1</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="s" style="color: #d14;">"custom_error"</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">unblocked</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">is_user_type_error</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkUserTypeErrorReporter</span><span class="p">)</span></span>
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713
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"> <span class="n" style="color: #333;">report1</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="s" style="color: #d14;">"custom_error"</span><span class="p">,</span> <span class="n" style="color: #333;">is_user_type_error</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkUserTypeErrorReporter</span><span class="p">)</span></span>
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714
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"></span>
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670
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">given_eq_spec</span></span>
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671
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<pre style="margin: 0;">-<span id="LC671" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"insoluble2"</span><span class="p">,</span> <span class="n" style="color: #333;">u<span class="idiff left">nblocked</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">u</span>tterly_wrong</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkEqErr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC672" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"skolem eq1"</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">unblocked</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">very_wrong</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkSkolReporter</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC673" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"skolem eq2"</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">unblocked</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">skolem_eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkSkolReporter</span><span class="p">)</span></span>
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674
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<pre style="margin: 0;">-<span id="LC674" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"non-tv eq"</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">unblocked</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">non_tv_eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkSkolReporter</span><span class="p">)</span></span>
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716
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"insoluble2"</span><span class="p">,</span> <span class="n" style="color: #333;">utterly_wrong</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkEqErr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"skolem eq1"</span><span class="p">,</span> <span class="n" style="color: #333;">very_wrong</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkSkolReporter</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"skolem eq2"</span><span class="p">,</span> <span class="n" style="color: #333;">skolem_eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkSkolReporter</span><span class="p">)</span></span>
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719
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"non-tv eq"</span><span class="p">,</span> <span class="n" style="color: #333;">non_tv_eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkSkolReporter</span><span class="p">)</span></span>
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720
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<pre style="margin: 0;"> <span id="LC720" class="line" lang="haskell"></span>
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721
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The only remaining equalities are alpha ~ ty,</span></span>
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677
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722
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where alpha is untouchable; and representational equalities</span></span>
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723
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Prefer homogeneous equalities over hetero, because the</span></span>
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679
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724
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- former might be holding up the latter.</span></span>
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680
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725
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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 [Equalities with incompatible kinds] in GHC.Tc.Solver.Canonical</span></span>
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681
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<pre style="margin: 0;">-<span id="LC681" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"Homo eqs"</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">unblocked</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">is_homo_equality</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkEqErr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC682" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"Other eqs"</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">unblocked</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">is_non_blocked_equality</span></span><span class="p"><span class="idiff right">,</span></span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkEqErr</span><span class="p">)</span></span>
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683
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="s" style="color: #d14;"><span class="idiff">"Blocked eqs"</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">is_equality</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">False</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkSuppressReporter</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkBlockedEqErr</span></span><span class="p"><span class="idiff right">)</span>]</span></span>
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726
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<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"Homo eqs"</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">is_homo_equality</span></span><span class="p"><span class="idiff right">,</span></span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkEqErr</span><span class="p">)</span></span>
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727
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<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"Other eqs"</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">is_equality</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkEqErr</span><span class="p">)</span></span>
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728
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"> <span class="p">]</span></span>
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684
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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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685
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730
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<pre style="margin: 0;"> <span id="LC730" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- report2: we suppress these if there are insolubles elsewhere in the tree</span></span>
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686
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731
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"> <span class="n" style="color: #333;">report2</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="s" style="color: #d14;">"Implicit params"</span><span class="p">,</span> <span class="n" style="color: #333;">is_ip</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkIPErr</span><span class="p">)</span></span>
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687
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732
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"Irreds"</span><span class="p">,</span> <span class="n" style="color: #333;">is_irred</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkIrredErr</span><span class="p">)</span></span>
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688
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733
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<pre style="margin: 0;"> <span id="LC733" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"Dicts"</span><span class="p">,</span> <span class="n" style="color: #333;">is_dict</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkDictErr</span><span class="p">)</span> <span class="p">]</span></span>
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689
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734
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<pre style="margin: 0;"> <span id="LC734" class="line" lang="haskell"></span>
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690
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<pre style="margin: 0;">-<span id="LC690" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- also checks to make sure the constraint isn't BlockedCIS</span></span>
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691
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See GHC.Tc.Solver.Canonical Note [Equalities with incompatible kinds], (4)</span></span>
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692
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell"> <span class="n" style="color: #333;">unblocked</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pred</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;">ErrorItem</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pred</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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693
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="haskell"> <span class="n" style="color: #333;">unblocked</span> <span class="n" style="color: #333;">checker</span> <span class="n" style="color: #333;">item</span> <span class="n" style="color: #333;">pred</span></span>
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694
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<pre style="margin: 0;">-<span id="LC694" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">badCoercionHole</span> <span class="p">(</span><span class="n" style="color: #333;">ei_pred</span> <span class="n" style="color: #333;">item</span><span class="p">)</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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695
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<pre style="margin: 0;">-<span id="LC695" 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;">checker</span> <span class="n" style="color: #333;">item</span> <span class="n" style="color: #333;">pred</span></span>
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735
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- report3: suppressed errors should be reported as categorized by either report1</span></span>
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736
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- or report2.</span></span>
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"> <span class="n" style="color: #333;">report3</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="s" style="color: #d14;">"wanted/wanted fundeps"</span><span class="p">,</span> <span class="n" style="color: #333;">is_ww_fundep</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkEqErr</span><span class="p">)</span></span>
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738
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"Blocked eqs"</span><span class="p">,</span> <span class="n" style="color: #333;">is_equality</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkBlockedEqErr</span><span class="p">)</span> <span class="p">]</span></span>
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696
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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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697
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740
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<pre style="margin: 0;"> <span id="LC740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- rigid_nom_eq, rigid_nom_tv_eq,</span></span>
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698
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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;">is_dict</span><span class="p">,</span> <span class="n" style="color: #333;">is_equality</span><span class="p">,</span> <span class="n" style="color: #333;">is_ip</span><span class="p">,</span> <span class="n" style="color: #333;">is_irred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pred</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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -723,15 +766,6 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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723
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766
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"> <span class="n" style="color: #333;">is_homo_equality</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty1</span> <span class="p">`</span><span class="n" style="color: #333;">tcEqType</span><span class="p">`</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty2</span></span>
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724
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767
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<pre style="margin: 0;"> <span id="LC767" class="line" lang="haskell"> <span class="n" style="color: #333;">is_homo_equality</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;">False</span></span>
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725
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768
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"></span>
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726
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<pre style="margin: 0;">-<span id="LC726" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we've already checked homogeneous equalities, so this one must be hetero</span></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;">is_non_blocked_equality</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty1</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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728
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<pre style="margin: 0;">-<span id="LC728" 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="n" style="color: #333;">tv1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTyVar_maybe</span> <span class="n" style="color: #333;">ty1</span></span>
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729
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<pre style="margin: 0;">-<span id="LC729" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isTouchableMetaTyVar</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">tv1</span></span>
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730
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<pre style="margin: 0;">-<span id="LC730" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Equalities with incompatible kinds] in GHC.Tc.Solver.Canonical,</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;">-- wrinkle (4c).</span></span>
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732
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<pre style="margin: 0;">-<span id="LC732" class="line" lang="haskell"> <span class="n" style="color: #333;">is_non_blocked_equality</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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733
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<pre style="margin: 0;">-<span id="LC733" class="line" lang="haskell"> <span class="n" style="color: #333;">is_non_blocked_equality</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;">False</span></span>
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734
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<pre style="margin: 0;">-<span id="LC734" class="line" lang="haskell"></span>
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735
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769
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"> <span class="n" style="color: #333;">is_equality</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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736
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770
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"> <span class="n" style="color: #333;">is_equality</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;">False</span></span>
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737
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771
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<pre style="margin: 0;"> <span id="LC771" 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">@@ -744,6 +778,10 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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744
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778
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="haskell"> <span class="n" style="color: #333;">is_irred</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IrredPred</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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745
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779
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"> <span class="n" style="color: #333;">is_irred</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;">False</span></span>
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746
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780
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"></span>
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781
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See situation (2) of Note [Suppress confusing errors]</span></span>
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782
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"> <span class="n" style="color: #333;">is_ww_fundep</span> <span class="n" style="color: #333;">item</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">is_ww_fundep_item</span> <span class="n" style="color: #333;">item</span></span>
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783
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"> <span class="n" style="color: #333;">is_ww_fundep_item</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isWantedWantedFunDepOrigin</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">errorItemOrigin</span></span>
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784
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"></span>
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747
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785
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<pre style="margin: 0;"> <span id="LC785" class="line" lang="haskell"> <span class="n" style="color: #333;">given_eq_spec</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Given errors]</span></span>
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748
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786
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<pre style="margin: 0;"> <span id="LC786" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">has_gadt_match</span> <span class="p">(</span><span class="n" style="color: #333;">cec_encl</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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749
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787
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="s" style="color: #d14;">"insoluble1a"</span><span class="p">,</span> <span class="n" style="color: #333;">is_given_eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGivenErrorReporter</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">@@ -785,6 +823,75 @@ isTyFun_maybe ty = case tcSplitTyConApp_maybe ty of</td>
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785
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823
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<pre style="margin: 0;"> <span id="LC823" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc</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;">tc</span></span>
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786
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<pre style="margin: 0;"> <span id="LC824" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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787
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825
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<pre style="margin: 0;"> <span id="LC825" class="line" lang="haskell"></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;">{- Note [Suppressing confusing errors]</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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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;">Certain errors we might encounter are potentially confusing to users.</span></span>
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829
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If there are any other errors to report, at all, we want to suppress these.</span></span>
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830
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"></span>
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831
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which errors:</span></span>
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832
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"></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;">1) Errors which are blocked by a coercion hole. This is described</span></span>
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834
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in point (4) of Note [Equalities with incompatible kinds] in Tc.Solver.Canonical.</span></span>
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835
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"></span>
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836
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2) Errors which arise from the interaction of two Wanted fun-dep constraints.</span></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;"> Example:</span></span>
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838
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"></span>
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839
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a b | a -> b where</span></span>
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840
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> op :: a -> b -> b</span></span>
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841
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<pre style="margin: 0;">+<span id="LC841" class="line" lang="haskell"></span>
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842
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo _ = op True Nothing</span></span>
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843
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"></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;"> bar _ = op False []</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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846
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here, we could infer</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;"> foo :: C Bool (Maybe a) => p -> Maybe a</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;"> bar :: C Bool [a] => p -> [a]</span></span>
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849
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"></span>
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850
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (The unused arguments suppress the monomorphism restriction.) The problem</span></span>
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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;"> is that these types can't both be correct, as they violate the functional</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;"> dependency. Yet reporting an error here is awkward: we must</span></span>
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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;"> non-deterministically choose either foo or bar to reject. We thus want</span></span>
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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;"> to report this problem only when there is nothing else to report.</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;"> See typecheck/should_fail/T13506 for an example of when to suppress</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;"> the error. The case above is actually accepted, because foo and bar</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;"> are checked separately, and thus the two fundep constraints never</span></span>
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858
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> encounter each other. It is test case typecheck/should_compile/FunDepOrigin1.</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"></span>
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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;"> This case applies only when both fundeps are *Wanted* fundeps; when</span></span>
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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;"> both are givens, the error represents unreachable code. For</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;"> a Given/Wanted case, see #9612.</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"></span>
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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;">Mechanism:</span></span>
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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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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;">We use the `suppress` function within reportWanteds to filter out these two</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;">cases, then report all other errors. Lastly, we return to these suppressed</span></span>
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868
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<pre style="margin: 0;">+<span id="LC868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ones and report them only if there have been no errors so far.</span></span>
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869
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<pre style="margin: 0;">+<span id="LC869" class="line" lang="haskell"></span>
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870
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<pre style="margin: 0;">+<span id="LC870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Avoid reporting duplicates]</span></span>
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871
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<pre style="margin: 0;">+<span id="LC871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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872
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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It would be embarrassing to report two identical errors to the user. We</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;">avoid doing so by logging a Unique associated with every error, in the</span></span>
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874
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cec_already_reported field of a ReportErrCtxt. These Uniques come from:</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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876
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * For Givens: it's the Unique on the ctev_evar storing the Given evidence.</span></span>
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877
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"></span>
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878
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * For Wanteds with CtReportAsSame: it's the Unique associated with the</span></span>
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879
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TcEvDest.</span></span>
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880
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"></span>
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881
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * For Wanteds with CtReportAsOther: it's the Unique in the CtReportAsOther,</span></span>
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882
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> which in turn comes from the TcEvDest of the originating Wanted, as placed</span></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> there in updateReportAs.</span></span>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We still must be sure to process all errors, including duplicates, because</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;">of the possibility of -fdefer-type-errors; each duplicate may carry its own</span></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">evidence (in the case of several constraints sharing the same CtReportAsOther).</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;">But when an error appears already in the cec_already_reported, we suppress</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;">the user-visible error report.</span></span>
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<pre style="margin: 0;">+<span id="LC891" 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="LC895" 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="LC896" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Reporters</span></span>
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<pre style="margin: 0;"> <span id="LC897" class="line" lang="haskell"><span class="c1" 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">@@ -822,7 +929,7 @@ reportHoles tidy_items ctxt</td>
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<pre style="margin: 0;"> <span id="LC929" class="line" lang="haskell"><span class="n" style="color: #333;">mkUserTypeErrorReporter</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Reporter</span></span>
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930
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<pre style="margin: 0;"> <span id="LC930" class="line" lang="haskell"><span class="n" style="color: #333;">mkUserTypeErrorReporter</span> <span class="n" style="color: #333;">ctxt</span></span>
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931
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<pre style="margin: 0;"> <span id="LC931" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM_</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;">item</span> <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;">err</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkUserTypeError</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item</span></span>
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<pre style="margin: 0;">-<span id="LC825" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">maybeReportError</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;">+<span id="LC932" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">maybeReportError</span> <span class="n" style="color: #333;">ctxt</span> <span class="p"><span class="idiff left">[</span></span><span class="n" style="color: #333;"><span class="idiff">item</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">err</span></span>
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826
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933
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<pre style="margin: 0;"> <span id="LC933" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">addDeferredBinding</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span> <span class="n" style="color: #333;">item</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC934" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC935" class="line" lang="haskell"><span class="n" style="color: #333;">mkUserTypeError</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1017" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -910,11 +1017,6 @@ mkGroupReporter :: (ReportErrCtxt -> [ErrorItem] -> TcM ErrMsg)</td>
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910
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"><span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mk_err</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">items</span></span>
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911
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1018
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<pre style="margin: 0;"> <span id="LC1018" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">reportGroup</span> <span class="n" style="color: #333;">mk_err</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">toList</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">equivClasses</span> <span class="n" style="color: #333;">cmp_loc</span> <span class="n" style="color: #333;">items</span><span class="p">)</span></span>
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912
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"></span>
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913
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<pre style="margin: 0;">-<span id="LC913" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Like mkGroupReporter, but doesn't actually print error messages</span></span>
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914
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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"><span class="n" style="color: #333;">mkSuppressReporter</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Reporter</span></span>
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915
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<pre style="margin: 0;">-<span id="LC915" class="line" lang="haskell"><span class="n" style="color: #333;">mkSuppressReporter</span> <span class="n" style="color: #333;">mk_err</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">items</span></span>
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916
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<pre style="margin: 0;">-<span id="LC916" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">suppressGroup</span> <span class="n" style="color: #333;">mk_err</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">toList</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">equivClasses</span> <span class="n" style="color: #333;">cmp_loc</span> <span class="n" style="color: #333;">items</span><span class="p">)</span></span>
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917
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="918" 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">
918
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"><span class="n" style="color: #333;">eq_lhs_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</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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<td class="diff-line-num old_line" data-linenumber="919" 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">
919
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"><span class="n" style="color: #333;">eq_lhs_type</span> <span class="n" style="color: #333;">item1</span> <span class="n" style="color: #333;">item2</span></span>
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920
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1022
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">classifyPredType</span> <span class="p">(</span><span class="n" style="color: #333;">ei_pred</span> <span class="n" style="color: #333;">item1</span><span class="p">),</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="p">(</span><span class="n" style="color: #333;">ei_pred</span> <span class="n" style="color: #333;">item2</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="933" 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="1035" 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">@@ -933,7 +1035,7 @@ reportGroup mk_err ctxt items =</td>
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933
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1035
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<pre style="margin: 0;"> <span id="LC1035" 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;">"Constraint:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">items</span></span>
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<td class="diff-line-num old_line" data-linenumber="934" 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">
934
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<td class="diff-line-num new_line" data-linenumber="1036" 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">
1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"cec_suppress ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="935" 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">
935
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<td class="diff-line-num new_line" data-linenumber="1037" 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">
1037
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"cec_defer_type_errors ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cec_defer_type_errors</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="p">]</span></span>
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936
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<td class="diff-line-num new_line old" data-linenumber="1038" 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="LC936" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">maybeReportError</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span></span>
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1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">maybeReportError</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;"><span class="idiff left">items</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">err</span></span>
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<td class="diff-line-num old_line" data-linenumber="937" 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">
937
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<td class="diff-line-num new_line" data-linenumber="1039" 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">
1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- But see Note [Always warn with -fdefer-type-errors]</span></span>
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938
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1040
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"reportGroup"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">items</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1041" 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;">addDeferredBinding</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span><span class="p">)</span> <span class="n" style="color: #333;">items</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">@@ -942,14 +1044,6 @@ reportGroup mk_err ctxt items =</td>
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but that's hard to know for sure, and if we don't</span></span>
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<pre style="margin: 0;"> <span id="LC1045" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- abort, we need bindings for all (e.g. #12156)</span></span>
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC945" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- like reportGroup, but does not actually report messages. It still adds</span></span>
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- -fdefer-type-errors bindings, though.</span></span>
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"><span class="n" style="color: #333;">suppressGroup</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Reporter</span></span>
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<pre style="margin: 0;">-<span id="LC948" class="line" lang="haskell"><span class="n" style="color: #333;">suppressGroup</span> <span class="n" style="color: #333;">mk_err</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">items</span></span>
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<pre style="margin: 0;">-<span id="LC949" 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;">err</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk_err</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">items</span></span>
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<pre style="margin: 0;">-<span id="LC950" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"Suppressing errors for"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">items</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC951" 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;">addDeferredBinding</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span><span class="p">)</span> <span class="n" style="color: #333;">items</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC952" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportHoleError</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportHoleError</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hole</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;"> <span id="LC1049" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isOutOfScopeHole</span> <span class="n" style="color: #333;">hole</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">@@ -989,12 +1083,19 @@ maybeReportHoleError ctxt hole@(Hole { hole_sort = ExprHole _ }) err</td>
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<pre style="margin: 0;"> <span id="LC1083" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleWarn</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">reportWarning</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reason</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnTypedHoles</span><span class="p">)</span> <span class="n" style="color: #333;">err</span></span>
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<pre style="margin: 0;"> <span id="LC1084" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleDefer</span> <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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<pre style="margin: 0;"> <span id="LC1085" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC992" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportError</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1086
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<pre style="margin: 0;">+<span id="LC1086" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportError</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="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">ErrorItem</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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993
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1087
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<pre style="margin: 0;"> <span id="LC1087" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Report the error and/or make a deferred binding for it</span></span>
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994
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<pre style="margin: 0;">-<span id="LC994" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportError</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span></span>
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1088
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<pre style="margin: 0;">+<span id="LC1088" class="line" lang="haskell"><span class="n" style="color: #333;">maybeReportError</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;"><span class="idiff left">items</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">err</span></span>
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995
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1089
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<pre style="margin: 0;"> <span id="LC1089" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span> <span class="c1" style="color: #998; font-style: italic;">-- Some worse error has occurred;</span></span>
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996
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1090
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<pre style="margin: 0;"> <span id="LC1090" 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 class="c1" style="color: #998; font-style: italic;">-- so suppress this error/warning</span></span>
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997
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1091
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<pre style="margin: 0;"> <span id="LC1091" class="line" lang="haskell"></span>
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1092
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<pre style="margin: 0;">+<span id="LC1092" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">any</span> <span class="p">((`</span><span class="n" style="color: #333;">elementOfUniqSet</span><span class="p">`</span> <span class="n" style="color: #333;">cec_already_reported</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ei_unique</span><span class="p">)</span> <span class="n" style="color: #333;">items</span></span>
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1093
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<pre style="margin: 0;">+<span id="LC1093" 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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1094
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<pre style="margin: 0;">+<span id="LC1094" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- suppress the group if any have been reported. Ideally, we'd like</span></span>
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1095
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<pre style="margin: 0;">+<span id="LC1095" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to suppress exactly those that have been reported, but this is</span></span>
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1096
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<pre style="margin: 0;">+<span id="LC1096" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- awkward, and it's more embarrassing to report the same error</span></span>
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1097
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<pre style="margin: 0;">+<span id="LC1097" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- twice than to suppress too eagerly</span></span>
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1098
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<pre style="margin: 0;">+<span id="LC1098" class="line" lang="haskell"></span>
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998
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1099
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<pre style="margin: 0;"> <span id="LC1099" 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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999
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1100
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cec_defer_type_errors</span> <span class="n" style="color: #333;">ctxt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1000
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1101
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<pre style="margin: 0;"> <span id="LC1101" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TypeDefer</span> <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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1074" 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="1175" 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">@@ -1074,9 +1175,15 @@ tryReporter ctxt (str, keep_me, suppress_after, reporter) items</td>
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1074
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1175
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<pre style="margin: 0;"> <span id="LC1175" 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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1075
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1176
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<pre style="margin: 0;"> <span id="LC1176" 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;">traceTc</span> <span class="s" style="color: #d14;">"tryReporter{ "</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">str</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">yeses</span><span class="p">)</span></span>
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1076
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1177
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<pre style="margin: 0;"> <span id="LC1177" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">no_errs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">askNoErrs</span> <span class="p">(</span><span class="n" style="color: #333;">reporter</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">yeses</span><span class="p">)</span></span>
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1077
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<pre style="margin: 0;">-<span id="LC1077" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">suppress_now</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">no_errs</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">suppress_after</span></span>
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<pre style="margin: 0;">+<span id="LC1178" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">suppress_these</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;">+<span id="LC1179" class="line" lang="haskell"> <span class="n" style="color: #333;">suppress_now</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">no_errs</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">suppress_after</span></span>
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<pre style="margin: 0;"> <span id="LC1180" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing error messages]</span></span>
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<pre style="margin: 0;">-<span id="LC1079" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">{</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">suppress_now</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1181" class="line" lang="haskell"> <span class="n" style="color: #333;">already_reported</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cec_already_reported</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;">+<span id="LC1182" class="line" lang="haskell"> <span class="n" style="color: #333;">already_reported'</span></span>
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<pre style="margin: 0;">+<span id="LC1183" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">suppress_these</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">already_reported</span></span>
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1184
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<pre style="margin: 0;">+<span id="LC1184" 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;">addListToUniqSet</span> <span class="n" style="color: #333;">already_reported</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ei_unique</span> <span class="n" style="color: #333;">yeses</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1185" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">{</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">suppress_now</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">suppress_these</span></span>
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<pre style="margin: 0;">+<span id="LC1186" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_already_reported</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">already_reported'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1187" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tryReporter end }"</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">str</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">suppress_after</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1188" 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;">ctxt'</span><span class="p">,</span> <span class="n" style="color: #333;">nos</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1189" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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 +1471,7 @@ validHoleFits :: ReportErrCtxt -- The context we're in, i.e. the</td>
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1471
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<pre style="margin: 0;"> <span id="LC1471" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with a possibly updated</span></span>
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1472
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<pre style="margin: 0;"> <span id="LC1472" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tidy environment, and</span></span>
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1366
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1473
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<pre style="margin: 0;"> <span id="LC1473" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the message.</span></span>
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1367
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<pre style="margin: 0;">-<span id="LC1367" class="line" lang="haskell"><span class="n" style="color: #333;">validHoleFits</span> <span class="n" style="color: #333;">ctxt</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEC</span> <span class="p">{</span><span class="n" style="color: #333;">cec_encl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span></span>
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1474
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<pre style="margin: 0;">+<span id="LC1474" class="line" lang="haskell"><span class="n" style="color: #333;">validHoleFits</span> <span class="n" style="color: #333;">ctxt</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEC</span> <span class="p">{</span><span class="idiff left right"> </span><span class="n" style="color: #333;">cec_encl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span></span>
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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;">cec_tidy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lcl_env</span><span class="p">})</span> <span class="n" style="color: #333;">simps</span> <span class="n" style="color: #333;">hole</span></span>
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1369
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1476
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<pre style="margin: 0;"> <span id="LC1476" 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="p">(</span><span class="n" style="color: #333;">tidy_env</span><span class="p">,</span> <span class="n" style="color: #333;">msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findValidHoleFits</span> <span class="n" style="color: #333;">lcl_env</span> <span class="n" style="color: #333;">implics</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mk_wanted</span> <span class="n" style="color: #333;">simps</span><span class="p">)</span> <span class="n" style="color: #333;">hole</span></span>
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1370
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1477
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<pre style="margin: 0;"> <span id="LC1477" 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;">ctxt</span> <span class="p">{</span><span class="n" style="color: #333;">cec_tidy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidy_env</span><span class="p">},</span> <span class="n" style="color: #333;">msg</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1739" 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">@@ -1632,7 +1739,7 @@ reportEqErr ctxt report item oriented ty1 ty2</td>
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1632
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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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1633
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1740
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"><span class="n" style="color: #333;">mkTyVarEqErr</span><span class="p">,</span> <span class="n" style="color: #333;">mkTyVarEqErr'</span></span>
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1634
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1741
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<pre style="margin: 0;"> <span id="LC1741" class="line" lang="haskell"> <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;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Report</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span></span>
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1635
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<pre style="margin: 0;">-<span id="LC1635" class="line" lang="haskell"> <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;">SwapFlag</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;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span></span>
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1742
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<pre style="margin: 0;">+<span id="LC1742" class="line" lang="haskell"> <span class="idiff left right"> </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;">SwapFlag</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;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span></span>
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1636
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1743
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<pre style="margin: 0;"> <span id="LC1743" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tv1 and ty2 are already tidied</span></span>
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1637
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1744
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<pre style="margin: 0;"> <span id="LC1744" class="line" lang="haskell"><span class="n" style="color: #333;">mkTyVarEqErr</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">report</span> <span class="n" style="color: #333;">item</span> <span class="n" style="color: #333;">oriented</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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1638
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1745
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<pre style="margin: 0;"> <span id="LC1745" 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;">traceTc</span> <span class="s" style="color: #d14;">"mkTyVarEqErr"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">item</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv1</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<li id="54436e21ea530a66a8a71bcc01c836f4740b8f02">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.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">@@ -1513,7 +1513,9 @@ solveWanteds wc@(WC { wc_simple = simples, wc_impl = implics, wc_holes = holes }</td>
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1513
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1513
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<pre style="margin: 0;"> <span id="LC1513" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">solved_wc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simpl_loop</span> <span class="mi" style="color: #099;">0</span> <span class="p">(</span><span class="n" style="color: #333;">solverIterations</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">floated_eqs</span></span>
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1514
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1514
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<pre style="margin: 0;"> <span id="LC1514" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">wc1</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics2</span> <span class="p">})</span></span>
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1515
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1515
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<pre style="margin: 0;"> <span id="LC1515" class="line" lang="haskell"></span>
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1516
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<pre style="margin: 0;">-<span id="LC1516" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_wc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">solved_wc</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1516" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">holes'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplifyHoles</span> <span class="n" style="color: #333;">holes</span></span>
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<pre style="margin: 0;">+<span id="LC1517" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_wc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">solved_wc</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes'</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1518" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1519" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ev_binds_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcEvBindsVar</span></span>
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<pre style="margin: 0;"> <span id="LC1520" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">bb</span> <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="n" style="color: #333;">getTcEvBindsMap</span> <span class="n" style="color: #333;">ev_binds_var</span></span>
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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"solveWanteds }"</span> <span class="o" style="font-weight: 600;">$</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">@@ -1880,6 +1882,15 @@ neededEvVars implic@(Implic { ic_given = givens</td>
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1882
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<pre style="margin: 0;"> <span id="LC1882" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_given</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">needs</span> <span class="c1" style="color: #998; font-style: italic;">-- Add the rhs vars of the Wanted bindings only</span></span>
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<pre style="margin: 0;"> <span id="LC1883" 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;">evVarsOfTerm</span> <span class="n" style="color: #333;">rhs</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">needs</span></span>
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<pre style="margin: 0;"> <span id="LC1884" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1885" 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="LC1886" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyHoles</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</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;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1887" class="line" lang="haskell"><span class="n" style="color: #333;">simplifyHoles</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapBagM</span> <span class="n" style="color: #333;">simpl_hole</span></span>
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<pre style="margin: 0;">+<span id="LC1888" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1889" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_hole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span></span>
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1890
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<pre style="margin: 0;">+<span id="LC1890" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_hole</span> <span class="n" style="color: #333;">h</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">hole_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1891" 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;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flattenType</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1892" 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;">h</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty'</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1893" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1894" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Delete dead Given evidence bindings]</span></span>
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1895
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<pre style="margin: 0;"> <span id="LC1895" 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="LC1896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As a result of superclass expansion, we speculatively</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#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">@@ -1894,7 +1894,7 @@ canCFunEqCan ev fn tys fsk</td>
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<pre style="margin: 0;"> <span id="LC1894" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1895" class="line" lang="haskell"> <span class="n" style="color: #333;">flav</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC1896" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1897" class="line" lang="haskell"> <span class="n" style="color: #333;">report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateReportAs</span> <span class="n" style="color: #333;">wrw</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvReportAs</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1897" class="line" lang="haskell"> <span class="n" style="color: #333;">report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateReportAs</span> <span class="n" style="color: #333;">wrw</span> <span class="p">(</span><span class="n" style="color: #333;">ctEv<span class="idiff left">Unique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff right">ctEv</span>Pred</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvReportAs</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1898" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ev'</span><span class="p">,</span> <span class="n" style="color: #333;">fsk'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1899" 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;">isTcReflexiveCo</span> <span class="n" style="color: #333;">kind_co</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [canCFunEqCan]</span></span>
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<pre style="margin: 0;"> <span id="LC1900" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</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;">"canCFunEqCan: refl"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_lhs</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">@@ -2380,7 +2380,7 @@ rewriteEvidence wrw ev@(CtWanted { ctev_pred = old_pred</td>
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<pre style="margin: 0;"> <span id="LC2380" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Fresh</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">new_ev</span></span>
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<pre style="margin: 0;"> <span id="LC2381" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Cached</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Cached wanted"</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2382" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC2383" class="line" lang="haskell"> <span class="n" style="color: #333;">report_as'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateReportAs</span> <span class="n" style="color: #333;">wrw</span> <span class="n" style="color: #333;">old_pred</span> <span class="n" style="color: #333;">report_as</span></span>
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<pre style="margin: 0;">+<span id="LC2383" class="line" lang="haskell"> <span class="n" style="color: #333;">report_as'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateReportAs</span> <span class="n" style="color: #333;">wrw</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">tcEvDestUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dest</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">old_pred</span> <span class="n" style="color: #333;">report_as</span></span>
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<pre style="margin: 0;"> <span id="LC2384" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2385" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2386" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span> <span class="c1" style="color: #998; font-style: italic;">-- YesWRW <=> a wanted rewrote a 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">@@ -2425,7 +2425,7 @@ rewriteEqEvidence wrw old_ev swapped nlhs nrhs lhs_co rhs_co</td>
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<pre style="margin: 0;"> <span id="LC2425" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span></span>
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<pre style="margin: 0;"> <span id="LC2426" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_nosh</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">si</span></span>
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<pre style="margin: 0;"> <span id="LC2427" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">old_ev</span></span>
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<pre style="margin: 0;">-<span id="LC2428" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">report_as'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateReportAs</span> <span class="n" style="color: #333;">wrw</span> <span class="n" style="color: #333;">old_pred</span> <span class="n" style="color: #333;">report_as</span></span>
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<pre style="margin: 0;">+<span id="LC2428" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">report_as'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateReportAs</span> <span class="n" style="color: #333;">wrw</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">tcEvDestUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dest</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">old_pred</span> <span class="n" style="color: #333;">report_as</span></span>
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<pre style="margin: 0;"> <span id="LC2429" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">dest</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC2430" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleDest</span> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC2431" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">new_ev</span><span class="p">,</span> <span class="n" style="color: #333;">hole_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEq_SI</span> <span class="p">(</span><span class="n" style="color: #333;">ch_blocker</span> <span class="n" style="color: #333;">hole</span><span class="p">)</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc'</span> <span class="n" style="color: #333;">report_as'</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#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">@@ -1587,7 +1587,7 @@ inertsCanDischarge inerts tv rhs fr</td>
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<pre style="margin: 0;"> <span id="LC1587" class="line" lang="haskell"> <span class="n" style="color: #333;">keep_deriv</span> <span class="n" style="color: #333;">ev_i</span></span>
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<pre style="margin: 0;"> <span id="LC1588" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Wanted</span> <span class="kt" style="color: #458; font-weight: 600;">WOnly</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ev_i</span> <span class="c1" style="color: #998; font-style: italic;">-- inert is [W]</span></span>
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<pre style="margin: 0;"> <span id="LC1589" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Wanted</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fr</span> <span class="c1" style="color: #998; font-style: italic;">-- work item is [WD]</span></span>
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<pre style="margin: 0;">-<span id="LC1590" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- Keep a derived version of the work item</span></span>
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<pre style="margin: 0;">+<span id="LC1590" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">False</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- "RAE" </span>True -- Keep a derived version of the work item</span></span>
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<pre style="margin: 0;"> <span id="LC1591" 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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<pre style="margin: 0;"> <span id="LC1592" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- Work item is fully discharged</span></span>
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<pre style="margin: 0;"> <span id="LC1593" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1416,17 +1416,17 @@ maybeEmitShadow :: InertCans -> Ct -> TcS Ct</td>
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<pre style="margin: 0;"> <span id="LC1416" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The improvement story and derived shadows]</span></span>
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<pre style="margin: 0;"> <span id="LC1417" class="line" lang="haskell"><span class="n" style="color: #333;">maybeEmitShadow</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC1419" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;">-<span id="LC1420" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_nosh</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC1419" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">{- "RAE" </span>ctev_pred = pred, ctev_loc = loc</span></span>
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1420
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<pre style="margin: 0;">+<span id="LC1420" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , <span class="idiff left">-}</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ctev_nosh</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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1421
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1421
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<pre style="margin: 0;"> <span id="LC1421" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">shouldSplitWD</span> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">ics</span><span class="p">)</span> <span class="n" style="color: #333;">ct</span></span>
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1422
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<pre style="margin: 0;">-<span id="LC1422" 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;">"Emit derived shadow"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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1423
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<pre style="margin: 0;">-<span id="LC1423" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">derived_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span></span>
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1422
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<pre style="margin: 0;">+<span id="LC1422" 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;">"<span class="idiff left right">RAE: NO: </span>Emit derived shadow"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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1423
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<pre style="margin: 0;">+<span id="LC1423" class="line" lang="haskell"> <span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">{-</span> ; let derived_ev = CtDerived { ctev_pred = pred</span></span>
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1424
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1424
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<pre style="margin: 0;"> <span id="LC1424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , ctev_loc = loc }</span></span>
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1425
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1425
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<pre style="margin: 0;"> <span id="LC1425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> shadow_ct = ct { cc_ev = derived_ev }</span></span>
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1426
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1426
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<pre style="margin: 0;"> <span id="LC1426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Te shadow constraint keeps the canonical shape.</span></span>
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1427
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<pre style="margin: 0;"> <span id="LC1427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- This just saves work, but is sometimes important;</span></span>
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<pre style="margin: 0;"> <span id="LC1428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- see Note [Keep CDictCan shadows as CDictCan]</span></span>
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1429
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<pre style="margin: 0;">-<span id="LC1429" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitWork</span> <span class="p">[</span><span class="n" style="color: #333;">shadow_ct</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; emitWork [shadow_ct]<span class="idiff left right"> -}</span></span></span>
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<pre style="margin: 0;"> <span id="LC1430" class="line" lang="haskell"></span>
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1431
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1431
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<pre style="margin: 0;"> <span id="LC1431" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ev'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_nosh</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WOnly</span> <span class="p">}</span></span>
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1432
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1432
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<pre style="margin: 0;"> <span id="LC1432" class="line" lang="haskell"> <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;">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="diff-line-num unfold js-unfold old_line" data-linenumber="3594" 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="3594" 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">@@ -3594,9 +3594,9 @@ emitNewDerivedEq loc role ty1 ty2</td>
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3594
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<pre style="margin: 0;"> <span id="LC3594" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Prioritise equalities] (Avoiding fundep iteration)</span></span>
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3595
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<pre style="margin: 0;"> <span id="LC3595" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3596" class="line" lang="haskell"><span class="n" style="color: #333;">newDerivedNC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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<pre style="margin: 0;">-<span id="LC3597" class="line" lang="haskell"><span class="n" style="color: #333;">newDerivedNC</span> <span class="n" style="color: #333;"><span class="idiff left">loc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pred</span></span></span>
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<pre style="margin: 0;">+<span id="LC3597" class="line" lang="haskell"><span class="n" style="color: #333;">newDerivedNC</span> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">newWantedNC</span></span><span class="idiff"> </span><span class="cm" style="color: #998; font-style: italic;"><span class="idiff right">{- "RAE"</span></span></span>
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<pre style="margin: 0;"> <span id="LC3598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = do { -- checkReductionDepth loc pred</span></span>
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<pre style="margin: 0;">-<span id="LC3599" 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;">CtDerived</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC3599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; return (CtDerived { ctev_pred = pred, ctev_loc = loc }) }<span class="idiff left right"> -}</span></span></span>
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<pre style="margin: 0;"> <span id="LC3600" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3601" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- --------- Check done in GHC.Tc.Solver.Interact.selectNewWorkItem???? ---------</span></span>
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<pre style="margin: 0;"> <span id="LC3602" class="line" lang="haskell"><span class="cd">-- | Checks if the depth of the given location is too much. Fails if</span></span>
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<li id="3b6d78a50c8462304f843b952a88e531718dbbd2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.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">@@ -22,7 +22,7 @@ module GHC.Tc.Types.Constraint (</td>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkIrredCt</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvLoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvOrigin</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvEqRel</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvTerm</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvCoercion</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvEvId</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctReportAs</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctReportAs</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">ctUnique</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCts</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCtList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCtsList</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC28" 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">@@ -51,7 +51,7 @@ module GHC.Tc.Types.Constraint (</td>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isWanted</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGiven</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isDerived</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGivenOrWDeriv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvRole</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setCtEvLoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">arisesFromGivens</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCtEvList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCtEv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCtEvsList</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvReportAs</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvReportAs</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">ctEvUnique</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">tcEvDestUnique</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</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;">ctPredToReport</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">substCtReportAs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">updateReportAs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</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;">wantedRewriteWanted</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">@@ -97,6 +97,7 @@ import GHC.Utils.FV</td>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>
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<pre style="margin: 0;"> <span id="LC98" 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="LC99" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique</span></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</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">@@ -467,6 +468,10 @@ ctReportAs ct = case ctEvidence ct of</td>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">report_as</span></span>
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<pre style="margin: 0;"> <span id="LC469" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"ctReportAs"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC470" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC471" class="line" lang="haskell"><span class="cd">-- | Extract a Unique from a 'Ct'</span></span>
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<pre style="margin: 0;">+<span id="LC472" class="line" lang="haskell"><span class="n" style="color: #333;">ctUnique</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;">Unique</span></span>
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<pre style="margin: 0;">+<span id="LC473" class="line" lang="haskell"><span class="n" style="color: #333;">ctUnique</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvUnique</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ctEvidence</span></span>
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<pre style="margin: 0;">+<span id="LC474" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC475" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC476" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">parens</span> <span class="n" style="color: #333;">pp_sort</span></span>
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477
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<pre style="margin: 0;"> <span id="LC477" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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">@@ -1024,10 +1029,11 @@ insolubleCt :: Ct -> Bool</td>
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1024
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1029
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<pre style="margin: 0;"> <span id="LC1029" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Definitely insoluble, in particular /excluding/ type-hole constraints</span></span>
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1025
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1030
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<pre style="margin: 0;"> <span id="LC1030" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Namely: a) an equality constraint</span></span>
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1026
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1031
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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- b) that is insoluble</span></span>
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1027
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<pre style="margin: 0;">-<span id="LC1027" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- c) and does not arise from a Given</span></span>
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1032
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- c) and does not arise from a Given<span class="idiff left right"> or a Wanted/Wanted fundep interaction</span></span></span>
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1028
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1033
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleCt</span> <span class="n" style="color: #333;">ct</span></span>
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1029
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1034
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<pre style="margin: 0;"> <span id="LC1034" 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;">insolubleEqCt</span> <span class="n" style="color: #333;">ct</span><span class="p">)</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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1030
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arisesFromGivens</span> <span class="p">(</span><span class="n" style="color: #333;">ctFlavour</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">ctLoc</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Given insolubles]</span></span>
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1036
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<pre style="margin: 0;">+<span id="LC1036" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isWantedWantedFunDepOrigin</span> <span class="p">(</span><span class="n" style="color: #333;">ctOrigin</span> <span class="n" style="color: #333;">ct</span><span class="p">)</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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1031
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1037
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<pre style="margin: 0;"> <span id="LC1037" 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;">True</span></span>
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1032
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"></span>
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1033
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleEqCt</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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1410,8 +1416,9 @@ data TcEvDest</td>
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1410
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1416
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<pre style="margin: 0;"> <span id="LC1416" class="line" lang="haskell"><span class="cd">-- | What should we report to the user when reporting this Wanted?</span></span>
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1411
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1417
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<pre style="margin: 0;"> <span id="LC1417" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds]</span></span>
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1412
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1418
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</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="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="c1" style="color: #998; font-style: italic;">-- just report the predicate in the Ct</span></span>
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1414
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<pre style="margin: 0;">-<span id="LC1414" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="c1" style="color: #998; font-style: italic;">-- report this other type</span></span>
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1419
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<pre style="margin: 0;">+<span id="LC1419" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="c1" style="color: #998; font-style: italic;">-- just report the predicate in the Ct</span></span>
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<pre style="margin: 0;">+<span id="LC1420" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="c1" style="color: #998; font-style: italic;">-- report this other type</span></span>
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1421
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<pre style="margin: 0;">+<span id="LC1421" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See GHC.Tc.Errors Note [Avoid reporting duplicates] about the Unique</span></span>
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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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1423
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<pre style="margin: 0;"> <span id="LC1423" class="line" lang="haskell"><span class="cd">-- | Did a wanted rewrite a wanted?</span></span>
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1417
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1424
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<pre style="margin: 0;"> <span id="LC1424" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds]</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">@@ -1488,12 +1495,21 @@ ctEvEvId (CtWanted { ctev_dest = HoleDest h }) = coHoleCoVar h</td>
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1488
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1495
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<pre style="margin: 0;"> <span id="LC1495" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvEvId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtGiven</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_evar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span></span>
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1489
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1496
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<pre style="margin: 0;"> <span id="LC1496" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvEvId</span> <span class="n" style="color: #333;">ctev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"ctEvId:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ctev</span><span class="p">)</span></span>
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1490
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1497
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<pre style="margin: 0;"> <span id="LC1497" class="line" lang="haskell"></span>
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1498
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<pre style="margin: 0;">+<span id="LC1498" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvUnique</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;">Unique</span></span>
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1499
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<pre style="margin: 0;">+<span id="LC1499" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvUnique</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtGiven</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_evar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varUnique</span> <span class="n" style="color: #333;">ev</span></span>
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1500
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<pre style="margin: 0;">+<span id="LC1500" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvUnique</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcEvDestUnique</span> <span class="n" style="color: #333;">dest</span></span>
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<pre style="margin: 0;">+<span id="LC1501" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvUnique</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkUniqueGrimily</span> <span class="mi" style="color: #099;">0</span> <span class="c1" style="color: #998; font-style: italic;">-- "RAE" this is evil.</span></span>
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1502
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<pre style="margin: 0;">+<span id="LC1502" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1503" class="line" lang="haskell"><span class="n" style="color: #333;">tcEvDestUnique</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcEvDest</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span></span>
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<pre style="margin: 0;">+<span id="LC1504" class="line" lang="haskell"><span class="n" style="color: #333;">tcEvDestUnique</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvVarDest</span> <span class="n" style="color: #333;">ev_var</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varUnique</span> <span class="n" style="color: #333;">ev_var</span></span>
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1505
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<pre style="margin: 0;">+<span id="LC1505" class="line" lang="haskell"><span class="n" style="color: #333;">tcEvDestUnique</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HoleDest</span> <span class="n" style="color: #333;">co_hole</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varUnique</span> <span class="p">(</span><span class="n" style="color: #333;">coHoleCoVar</span> <span class="n" style="color: #333;">co_hole</span><span class="p">)</span></span>
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1506
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<pre style="margin: 0;">+<span id="LC1506" class="line" lang="haskell"></span>
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1491
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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"><span class="n" style="color: #333;">setCtEvLoc</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;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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1492
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<pre style="margin: 0;"> <span id="LC1508" class="line" lang="haskell"><span class="n" style="color: #333;">setCtEvLoc</span> <span class="n" style="color: #333;">ctev</span> <span class="n" style="color: #333;">loc</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;">ctev_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">}</span></span>
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1493
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<pre style="margin: 0;"> <span id="LC1509" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1510" class="line" lang="haskell"><span class="n" style="color: #333;">arisesFromGivens</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</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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1511
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<pre style="margin: 0;"> <span id="LC1511" class="line" lang="haskell"><span class="n" style="color: #333;">arisesFromGivens</span> <span class="kt" style="color: #458; font-weight: 600;">Given</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;">True</span></span>
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<pre style="margin: 0;">-<span id="LC1496" class="line" lang="haskell"><span class="n" style="color: #333;">arisesFromGivens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Wanted</span> <span class="p">{})</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</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 right">False</span></span></span>
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<pre style="margin: 0;">+<span id="LC1512" class="line" lang="haskell"><span class="n" style="color: #333;">arisesFromGivens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Wanted</span> <span class="p">{})</span> <span class="n" style="color: #333;"><span class="idiff left">loc</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">isGivenLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- could be a Given FunDep</span></span></span>
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1497
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<pre style="margin: 0;"> <span id="LC1513" class="line" lang="haskell"><span class="n" style="color: #333;">arisesFromGivens</span> <span class="kt" style="color: #458; font-weight: 600;">Derived</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isGivenLoc</span> <span class="n" style="color: #333;">loc</span></span>
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1498
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1514
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<pre style="margin: 0;"> <span id="LC1514" class="line" lang="haskell"></span>
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1515
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<pre style="margin: 0;"> <span id="LC1515" class="line" lang="haskell"><span class="cd">-- | Return a 'CtReportAs' from a 'CtEvidence'. Returns</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">@@ -1504,31 +1520,31 @@ ctEvReportAs _ = CtReportAsSame</td>
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<pre style="margin: 0;"> <span id="LC1520" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell"><span class="cd">-- | Given the pred in a CtWanted and its 'CtReportAs', get</span></span>
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<pre style="margin: 0;"> <span id="LC1522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the pred to report. See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">-<span id="LC1507" class="line" lang="haskell"><span class="n" style="color: #333;">ctPredToReport</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Tc<span class="idiff left">PredType</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">CtReportAs</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 right">TcPredType</span></span></span>
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<pre style="margin: 0;">-<span id="LC1508" class="line" lang="haskell"><span class="n" style="color: #333;">ctPredToReport</span> <span class="n" style="color: #333;"><span class="idiff left">pred</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtReportAsSame</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">pred</span></span></span>
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<pre style="margin: 0;">-<span id="LC1509" class="line" lang="haskell"><span class="n" style="color: #333;">ctPredToReport</span> <span class="kr" style="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">CtReportAsOther</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pred</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pred</span></span></span>
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<pre style="margin: 0;">+<span id="LC1523" class="line" lang="haskell"><span class="n" style="color: #333;">ctPredToReport</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Tc<span class="idiff left">EvDest</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">TcPredType</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">CtReportAs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Unique</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcPredType</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1524" class="line" lang="haskell"><span class="n" style="color: #333;">ctPredToReport</span> <span class="n" style="color: #333;"><span class="idiff left">dest</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pred</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtReportAsSame</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tcEvDestUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dest</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pred</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"><span class="n" style="color: #333;">ctPredToReport</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtReportAsOther</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">u</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pred</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">u</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pred</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC1526" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1527" class="line" lang="haskell"><span class="cd">-- | Substitute in a 'CtReportAs'</span></span>
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1528
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<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"><span class="n" style="color: #333;">substCtReportAs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span></span>
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1513
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<pre style="margin: 0;">-<span id="LC1513" class="line" lang="haskell"><span class="n" style="color: #333;">substCtReportAs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span></span>
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1514
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<pre style="margin: 0;">-<span id="LC1514" class="line" lang="haskell"><span class="n" style="color: #333;">substCtReportAs</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;"><span class="idiff left">pred</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">CtReportAsOther</span></span> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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1529
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<pre style="margin: 0;">+<span id="LC1529" class="line" lang="haskell"><span class="n" style="color: #333;">substCtReportAs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span></span>
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1530
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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"><span class="n" style="color: #333;">substCtReportAs</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;"><span class="idiff left">u</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pred</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtReportAsOther</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">u</span></span> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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1515
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1531
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<pre style="margin: 0;"> <span id="LC1531" class="line" lang="haskell"></span>
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1516
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1532
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<pre style="margin: 0;"> <span id="LC1532" class="line" lang="haskell"><span class="cd">-- | After rewriting a Wanted, update the 'CtReportAs' for the new Wanted.</span></span>
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1517
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1533
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<pre style="margin: 0;"> <span id="LC1533" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the old CtReportAs is CtReportAsSame and a wanted rewrote a wanted,</span></span>
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1518
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1534
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<pre style="margin: 0;"> <span id="LC1534" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- record the old pred as the new CtReportAs.</span></span>
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1519
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1535
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<pre style="margin: 0;"> <span id="LC1535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">-<span id="LC1520" class="line" lang="haskell"><span class="n" style="color: #333;">updateReportAs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="c1" style="color: #998; font-style: italic;">-- _old_ pred type</span></span>
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1536
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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"><span class="n" style="color: #333;">updateReportAs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Unique</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="c1" style="color: #998; font-style: italic;">-- _old_ pred type</span></span>
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1537
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<pre style="margin: 0;"> <span id="LC1537" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span></span>
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1522
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<pre style="margin: 0;">-<span id="LC1522" class="line" lang="haskell"><span class="n" style="color: #333;">updateReportAs</span> <span class="kt" style="color: #458; font-weight: 600;">YesWRW</span> <span class="n" style="color: #333;"><span class="idiff left">old_pred</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtReportAsSame</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 right">CtReportAsOther</span></span> <span class="n" style="color: #333;">old_pred</span></span>
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1523
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<pre style="margin: 0;">-<span id="LC1523" class="line" lang="haskell"><span class="n" style="color: #333;">updateReportAs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span></span>
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1538
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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"><span class="n" style="color: #333;">updateReportAs</span> <span class="kt" style="color: #458; font-weight: 600;">YesWRW</span> <span class="n" style="color: #333;"><span class="idiff left">unique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">old_pred</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtReportAsSame</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">CtReportAsOther</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">unique</span></span> <span class="n" style="color: #333;">old_pred</span></span>
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1539
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"><span class="n" style="color: #333;">updateReportAs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span> <span class="n" style="color: #333;">report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span></span>
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1524
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1540
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<pre style="margin: 0;"> <span id="LC1540" class="line" lang="haskell"></span>
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1525
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1541
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<pre style="margin: 0;"> <span id="LC1541" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TcEvDest</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1526
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1542
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<pre style="margin: 0;"> <span id="LC1542" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HoleDest</span> <span class="n" style="color: #333;">h</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"hole"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">h</span></span>
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1527
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1543
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<pre style="margin: 0;"> <span id="LC1543" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvVarDest</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev</span></span>
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1528
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1544
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<pre style="margin: 0;"> <span id="LC1544" class="line" lang="haskell"></span>
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1529
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1545
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<pre style="margin: 0;"> <span id="LC1545" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1530
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<pre style="margin: 0;">-<span id="LC1530" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CtReportAsSame"</span></span>
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1531
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<pre style="margin: 0;">-<span id="LC1531" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;"><span class="idiff left">pred</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">parens</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">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff right">"CtReportAsOther"</span></span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pred</span></span>
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1546
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<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CtReportAsSame"</span></span>
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1547
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;"><span class="idiff left">u</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pred</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">parens</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">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"CtReportAsOther"</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">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">u</span></span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pred</span></span>
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1532
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1548
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<pre style="margin: 0;"> <span id="LC1548" class="line" lang="haskell"></span>
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1533
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1549
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<pre style="margin: 0;"> <span id="LC1549" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1534
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1550
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<pre style="margin: 0;"> <span id="LC1550" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">NoWRW</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"NoWRW"</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1676" 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="1692" 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">@@ -1676,6 +1692,9 @@ predicate with respect to any givens (only). That rewritten predicate</td>
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1676
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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;">is reported to the user. Simple, and it costs time only when errors</span></span>
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1677
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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;">are being reported.</span></span>
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1678
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1694
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<pre style="margin: 0;"> <span id="LC1694" class="line" lang="haskell"></span>
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1695
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<pre style="margin: 0;">+<span id="LC1695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"RAE": Givens don't rewrite CtReportAs. But that's OK because givens</span></span>
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1696
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<pre style="margin: 0;">+<span id="LC1696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">get there first.</span></span>
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1697
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<pre style="margin: 0;">+<span id="LC1697" class="line" lang="haskell"></span>
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1679
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1698
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<pre style="margin: 0;"> <span id="LC1698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Deriveds do rewrite Deriveds]</span></span>
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1680
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1699
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<pre style="margin: 0;"> <span id="LC1699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1681
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1700
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<pre style="margin: 0;"> <span id="LC1700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However we DO allow Deriveds to rewrite Deriveds, because that's how</span></span>
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<li id="93bba9b9e0195db135fec54160523a427ea042fd">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#93bba9b9e0195db135fec54160523a427ea042fd"><strong>compiler/GHC/Tc/Types/Origin.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">@@ -16,7 +16,7 @@ module GHC.Tc.Types.Origin (</td>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- CtOrigin</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</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;">exprCtOrigin</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lexprCtOrigin</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">matchesCtOrigin</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">grhssCtOrigin</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isVisibleOrigin</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toInvisibleOrigin</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprCtOrigin</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGivenOrigin</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprCtOrigin</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGivenOrigin</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">isWantedWantedFunDepOrigin</span></span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC22" 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">@@ -462,6 +462,12 @@ isGivenOrigin (FunDepOrigin1 _ o1 _ _ o2 _) = isGivenOrigin o1 && isGivenOrigin</td>
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell"><span class="n" style="color: #333;">isGivenOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunDepOrigin2</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">o1</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="n" style="color: #333;">isGivenOrigin</span> <span class="n" style="color: #333;">o1</span></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"><span class="n" style="color: #333;">isGivenOrigin</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC465" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing confusing errors] in GHC.Tc.Errors</span></span>
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<pre style="margin: 0;">+<span id="LC466" class="line" lang="haskell"><span class="n" style="color: #333;">isWantedWantedFunDepOrigin</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC467" class="line" lang="haskell"><span class="n" style="color: #333;">isWantedWantedFunDepOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunDepOrigin1</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">orig1</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">orig2</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC468" 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;">isGivenOrigin</span> <span class="n" style="color: #333;">orig1</span><span class="p">)</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;">isGivenOrigin</span> <span class="n" style="color: #333;">orig2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC469" class="line" lang="haskell"><span class="n" style="color: #333;">isWantedWantedFunDepOrigin</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC470" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprCtOrigin</span></span>
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<pre style="margin: 0;"> <span id="LC473" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb"><strong>compiler/GHC/Tc/Utils/TcMType.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">@@ -242,13 +242,7 @@ emitDerivedEqs origin pairs</td>
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<pre style="margin: 0;"> <span id="LC242" 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;">pairs</span></span>
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<pre style="margin: 0;"> <span id="LC243" 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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<pre style="margin: 0;"> <span id="LC244" 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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<pre style="margin: 0;">-<span id="LC245" 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;">loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCtLocM</span> <span class="n" style="color: #333;">origin</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">-<span id="LC246" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitSimples</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">mk_one</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">pairs</span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC247" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC248" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_one</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">ty1</span><span class="p">,</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkNonCanonical</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC250" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimEqPred</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC251" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">uncurry</span> <span class="p">(</span><span class="n" style="color: #333;">emitWantedEq</span> <span class="n" style="color: #333;">origin</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">))</span> <span class="n" style="color: #333;">pairs</span></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="haskell"><span class="cd">-- | Emits a new equality constraint</span></span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="haskell"><span class="n" style="color: #333;">emitWantedEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</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;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2091,8 +2085,8 @@ zonkCtEvidence ctev@(CtWanted { ctev_pred = pred</td>
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<pre style="margin: 0;"> <span id="LC2085" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- necessary in simplifyInfer</span></span>
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<pre style="margin: 0;"> <span id="LC2086" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleDest</span> <span class="n" style="color: #333;">h</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HoleDest</span> <span class="n" style="color: #333;">h</span></span>
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<pre style="margin: 0;"> <span id="LC2087" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">report_as'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">report_as</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC2094" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span></span>
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<pre style="margin: 0;">-<span id="LC2095" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;"><span class="idiff left">report_pred</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 right">CtReportAsOther</span></span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">report_pred</span></span>
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<pre style="margin: 0;">+<span id="LC2088" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span></span>
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<pre style="margin: 0;">+<span id="LC2089" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;"><span class="idiff left">u</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">report_pred</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtReportAsOther</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">u</span></span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">report_pred</span></span>
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<pre style="margin: 0;"> <span id="LC2090" 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;">ctev</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred'</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest'</span></span>
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<pre style="margin: 0;"> <span id="LC2091" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as'</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2092" class="line" lang="haskell"><span class="n" style="color: #333;">zonkCtEvidence</span> <span class="n" style="color: #333;">ctev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</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">@@ -2285,8 +2279,8 @@ tidyCtEvidence :: TidyEnv -> CtEvidence -> CtEvidence</td>
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<pre style="margin: 0;"> <span id="LC2279" class="line" lang="haskell"><span class="n" style="color: #333;">tidyCtEvidence</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ctev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC2280" class="line" lang="haskell"> <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;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">pred</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidy_report_as</span> <span class="n" style="color: #333;">report_as</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2281" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">tidy_report_as</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span></span>
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<pre style="margin: 0;">-<span id="LC2288" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_report_as</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;">report_pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2289" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="p">(</span><span class="n" style="color: #333;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">report_pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2282" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_report_as</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;"><span class="idiff left">u</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">report_pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2283" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;"><span class="idiff left">u</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">report_pred</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2284" class="line" lang="haskell"><span class="n" style="color: #333;">tidyCtEvidence</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ctev</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;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2285" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC2286" class="line" lang="haskell"> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="n" style="color: #333;">ctev</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#31fcb928c5966c783c0b5c6b2ef7a897b58e4daa"><strong>testsuite/tests/indexed-types/should_fail/SimpleFail16.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">SimpleFail16.hs:10:12: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> <span class="idiff left right">Couldn't match expected type ‘p0 a0’ with actual type ‘F ()</span>’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> The type variables ‘p0’, ‘a0’ are ambiguous</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> In the first argument of ‘foo’, namely ‘(undefined :: F ())’</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In the expression: foo (undefined :: F ())</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> In an equation for ‘bar’: bar = foo (undefined :: F ())</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext"> bar :: p0 a0 (bound at SimpleFail16.hs:10:1)</span></pre>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> <span class="idiff left right">• Couldn't match expected type ‘F ()’ with actual type ‘p0 a0</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right"> </span>The type variables ‘p0’, ‘a0’ are ambiguous</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> <span class="idiff left right">• </span>In the first argument of ‘foo’, namely ‘(undefined :: F ())’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> <span class="idiff left right"> </span>In the expression: foo (undefined :: F ())</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> <span class="idiff left right"> </span>In an equation for ‘bar’: bar = foo (undefined :: F ())</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> <span class="idiff left right">• </span>Relevant bindings include</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> <span class="idiff left right"> </span>bar :: p0 a0 (bound at SimpleFail16.hs:10:1)</span></pre>
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<li id="450c4d136f7e999d04363e35060e5ea43ab3aac5">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#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"> • Occurs check: cannot construct the infinite type:</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> t0 ~ Divide a (a : t0)</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> The type variable ‘t0’ is ambiguous</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> Expected type: Product (Divide a (a : as))</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> Actual type: Product as1</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> • In the expression: as</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> In the expression: (a, as)</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> In an equation for ‘divide’: divide (a :* as) = (a, as)</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> divide :: Product (a : as) -> (a, Product (Divide a (a : as)))</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> (bound at T13784.hs:29:5)</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext">T13784.hs:29:28: error:</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> • Couldn't match type ‘as’ with ‘a : a : a : t0’</span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext"> ‘as’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext"> the instance declaration</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"> at T13784.hs:25:10-30</span>
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<li id="fdad8ca739f3d61752da4e6fec4e8e7e5604fb9a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#fdad8ca739f3d61752da4e6fec4e8e7e5604fb9a"><strong>testsuite/tests/partial-sigs/should_compile/T10403.stderr</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">@@ -39,16 +39,17 @@ T10403.hs:22:15: warning: [-Wdeferred-type-errors (in -Wdefault)]</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext"> In the expression: H . fmap (const ())</span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext"> In the expression: (H . fmap (const ())) (fmap f b)</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="plaintext">T10403.hs:28:<span class="idiff left right">8</span>: warning: [-Wdeferred-type-errors (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext">T10403.hs:28:<span class="idiff left right">20</span>: warning: [-Wdeferred-type-errors (in -Wdefault)]</span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext"> • Couldn't match type ‘f0’ with ‘B t’</span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext"> because type variable ‘t’ would escape its scope</span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"> This (rigid, skolem) type variable is bound by</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext"> app2 :: forall t. H (B t)</span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="plaintext"> at T10403.hs:27:1-15</span>
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<pre style="margin: 0;">-<span id="LC49" class="line" lang="plaintext"> Expected type: H (B t)</span>
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<pre style="margin: 0;">-<span id="LC50" class="line" lang="plaintext"> Actual type: H f0</span>
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="plaintext"> • In the expression: h2 (H . I) (B ())</span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext"> Expected type: f0 ()</span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext"> Actual type: B t ()</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext"> • In the second argument of ‘h2’, namely ‘(B ())’</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext"> In the expression: h2 (H . I) (B ())</span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext"> In an equation for ‘app2’: app2 = h2 (H . I) (B ())</span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext"> app2 :: H (B t) (bound at T10403.hs:28:1)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#ac122c96475dd685d19229121246af1623ce5aa8"><strong>testsuite/tests/polykinds/T11142.stderr</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">@@ -4,14 +4,3 @@ T11142.hs:9:49: error:</td>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> • In the second argument of ‘SameKind’, namely ‘b’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> In the type signature:</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> foo :: forall b. (forall k (a :: k). SameKind a b) -> ()</span></pre>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">T11142.hs:10:7: error:</span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘a0’</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> with a type involving polytypes:</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> (forall k1 (a :: k1). SameKind a b) -> ()</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> GHC doesn't yet support impredicative polymorphism</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> • In the expression: undefined</span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"> In an equation for ‘foo’: foo = undefined</span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext"> foo :: (forall k1 (a :: k1). SameKind a b) -> ()</span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext"> (bound at T11142.hs:10:1)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#580bc848e0ce06fa5fde84bbd40dbbcc7bbf3518"><strong>testsuite/tests/polykinds/T12444.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">T12444.hs:19:11: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘b’ with ‘'Succ <span class="idiff left right">(c :+: b)</span>’</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘b’ with ‘'Succ <span class="idiff left right">t0</span>’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> ‘b’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> foo :: forall (c :: Nat) (b :: Nat).</span>
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<li id="f6f3fe949a2cbc72ebd9c2a22b3067595b1831a9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#f6f3fe949a2cbc72ebd9c2a22b3067595b1831a9"><strong>testsuite/tests/polykinds/T14172.stderr</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">@@ -11,12 +11,12 @@ T14172.hs:6:46: error:</td>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> In the type ‘(a -> f b) -> g a -> f (h _)’</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext">T14172.hs:7:19: error:</span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"> • <span class="idiff left right">Occurs check: cannot construct the infinite type: a ~ g'0 a</span></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext"> <span class="idiff left right">Expected type: (f'0 a -> f (f'0 b))</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext"> <span class="idiff left right"> -> Compose f'0 g'0 a -> f (h a')</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext"> <span class="idiff left right">Actual type: (Unwrapped (Compose f'0 g'0 a)</span></span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext"> <span class="idiff left right"> -> f (Unwrapped (h a'))</span>)</span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"> <span class="idiff left right"> -> Compose f'0 g'0 a -> f (h a')</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> • <span class="idiff left right">Couldn't match type ‘h’ with ‘Compose f'0 g'0’</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> <span class="idiff left right"> arising from a use of ‘_Wrapping’</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> <span class="idiff left right">‘h’ is a rigid type variable bound by</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> <span class="idiff left right">the inferred type of</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> <span class="idiff left right">traverseCompose :: (a -> f b) -> g a -> f (h a'</span>)</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> <span class="idiff left right">at T14172.hs:6:1-47</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"> • In the first argument of ‘(.)’, namely ‘_Wrapping Compose’</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"> In the expression: _Wrapping Compose . traverse</span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext"> In an equation for ‘traverseCompose’:</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">@@ -24,3 +24,15 @@ T14172.hs:7:19: error:</td>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"> traverseCompose :: (a -> f b) -> g a -> f (h a')</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"> (bound at T14172.hs:7:1)</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext">T14172.hs:7:19: error:</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"> • Couldn't match type ‘Compose f'0 g'1 a'0 -> f (h a')’</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> with ‘g a -> f (h a')’</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext"> Expected type: (a -> f b) -> g a -> f (h a')</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext"> Actual type: (a -> f b) -> Compose f'0 g'1 a'0 -> f (h a')</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"> • In the expression: _Wrapping Compose . traverse</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext"> In an equation for ‘traverseCompose’:</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext"> traverseCompose = _Wrapping Compose . traverse</span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext"> traverseCompose :: (a -> f b) -> g a -> f (h a')</span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext"> (bound at T14172.hs:7:1)</span></pre>
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<li id="778f16c490e0368e143014f33761355a3acb23e5">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#778f16c490e0368e143014f33761355a3acb23e5"><strong>testsuite/tests/typecheck/should_compile/FunDepOrigin1.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 MultiParamTypeClasses, FunctionalDependencies, FlexibleContexts #-}</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="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">FunDepOrigin1</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</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="kr" style="font-weight: 600;">where</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="n" style="color: #333;">op</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="n" style="color: #333;">b</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">op</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">bar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">op</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing confusing errors] in GHC.Tc.Errors</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#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">@@ -705,3 +705,4 @@ test('T18005', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18023</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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706
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706
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18036</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="LC707" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18036a</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="LC708" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FunDepOrigin1</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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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#f72282051f998cf10c629b48eaa08cc0a6e3dd08"><strong>testsuite/tests/typecheck/should_compile/hole_constraints.stderr</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">@@ -47,8 +47,8 @@ hole_constraints.hs:16:35: warning: [-Wtyped-holes (in -Wdefault)]</td>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext"> mempty :: forall a. Monoid a => a</span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">hole_constraints.hs:20:19: warning: [-Wtyped-holes (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC50" class="line" lang="plaintext"> • Found hole: _ :: <span class="idiff left right">a</span></span>
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="plaintext"> Where: ‘<span class="idiff left right">a</span>’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext"> • Found hole: _ :: <span class="idiff left right">b</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext"> Where: ‘<span class="idiff left right">b</span>’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext"> castWith :: forall a b. (a :~: b) -> a -> b</span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"> at hole_constraints.hs:19:1-29</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#98324bfd33fc7908f03dbee94a5e8bd5c72ea545"><strong>testsuite/tests/typecheck/should_fail/FunDepOrigin1b.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 MultiParamTypeClasses, FunctionalDependencies, FlexibleContexts #-}</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="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">FunDepOrigin1b</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</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="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="n" style="color: #333;">op</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="n" style="color: #333;">b</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="n" style="color: #333;">foo</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">op</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">op</span> <span class="kt" style="color: #458; font-weight: 600;">False</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="LC10" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing confusing errors] in GHC.Tc.Errors</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#769a20b7cf6a476e32366a570555eea2cea37bd2"><strong>testsuite/tests/typecheck/should_fail/FunDepOrigin1b.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">FunDepOrigin1b.hs:8:27: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘Maybe a’ with ‘[a1]’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> arising from a functional dependency between constraints:</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> ‘C Bool [a1]’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> arising from a use of ‘op’ at FunDepOrigin1b.hs:8:27-37</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> ‘C Bool (Maybe a)’</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> arising from a use of ‘op’ at FunDepOrigin1b.hs:8:10-24</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> • In the expression: op False []</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> In the expression: (op True Nothing, op False [])</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> In an equation for ‘foo’: foo _ = (op True Nothing, op False [])</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> foo :: p -> (Maybe a, [a1]) (bound at FunDepOrigin1b.hs:8:1)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#a65a3ee62514972c41618851c54e682121851e89"><strong>testsuite/tests/typecheck/should_fail/T14325.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">T14325.hs:11:9: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Could not deduce (C b (f b)) arising from a use of ‘foo’</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> from the context: C (f b) b</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> bound by the type signature for:</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> hm3 :: forall (f :: * -> *) b. C (f b) b => b -> f b</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> at T14325.hs:10:1-28</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Occurs check: cannot construct the infinite type: b ~ f b</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> arising from a use of ‘foo’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • In the expression: foo x</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> In an equation for ‘hm3’: hm3 x = foo x</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> x :: b (bound at T14325.hs:11:5)</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> hm3 :: b -> f b (bound at T14325.hs:11:1)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#4a61fc1c319324b4178596746c12f7efdf560697"><strong>testsuite/tests/typecheck/should_fail/T15767.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">T15767.hs:7:5: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • No instance for (C () b) arising from a use of ‘x’</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • No instance for (C () b<span class="idiff left right">0</span>) arising from a use of ‘x’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> • In the expression: x</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> In an equation for ‘y’:</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> y = x</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/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">@@ -563,3 +563,4 @@ test('T17021', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17021b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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564
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564
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<pre style="margin: 0;"> <span id="LC564" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17955</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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565
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17173</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FunDepOrigin1b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e091141d11228f719a56681736d5c2d75e760407...f5433f0bc06f65deb96a44b62d47875ec4bc5b38#6544261c560cd0344b7a1682b390319089d5b1cb"><strong>testsuite/tests/typecheck/should_fail/tcfail204.stderr</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">@@ -5,5 +5,9 @@ tcfail204.hs:10:7: error: [-Wtype-defaults (in -Wall), -Werror=type-defaults]</td>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> arising from a use of ‘ceiling’ at tcfail204.hs:10:7-17</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> (Fractional a0)</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> arising from the literal ‘6.3’ at tcfail204.hs:10:15-17</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> (Num a0) arising from the literal ‘6.3’ at tcfail204.hs:10:15-17</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> (Real a0) arising from a use of ‘ceiling’ at tcfail204.hs:10:7-17</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> (Ord a0) arising from a use of ‘ceiling’ at tcfail204.hs:10:7-17</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> (Eq a0) arising from a use of ‘ceiling’ at tcfail204.hs:10:7-17</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> • In the expression: ceiling 6.3</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> In an equation for ‘foo’: foo = ceiling 6.3</span></pre>
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