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<h3>
Simon Peyton Jones pushed to branch wip/T17775
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/c73bb2ecfa4aec49a915777adc698bc8839e9e71">c73bb2ec</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-28T00:52:10+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More wibbles
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<h4>17 changed files:</h4>
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<li class="file-stats">
<a href="#892acbb198a9095c917740d3c1297b56df4e3b7e">
compiler/GHC/Rename/HsType.hs
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</li>
<li class="file-stats">
<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
compiler/GHC/Tc/Errors.hs
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<li class="file-stats">
<a href="#b18f1cc437ab64ccd37a7cae3b8c3f9071aef45e">
compiler/GHC/Tc/Gen/Default.hs
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<li class="file-stats">
<a href="#902811828741e6bcd64702935bbb54edbbd070ef">
compiler/GHC/Tc/Gen/Expr.hs
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<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<li class="file-stats">
<a href="#eade747fa0a15693c67617629e286714fce958e4">
compiler/GHC/Tc/Gen/Sig.hs
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<li class="file-stats">
<a href="#9ea832ccdb4b5f7508a1efd6caedeafa16b269e7">
compiler/GHC/Tc/Gen/Splice.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="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<li class="file-stats">
<a href="#e63425e031ffe9350ee6b1687e506aaea75d11e1">
compiler/GHC/Tc/TyCl/Instance.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="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
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<li class="file-stats">
<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<li class="file-stats">
<a href="#bda6fd73ee46adb428d2f370a800d75d8870285b">
testsuite/tests/dependent/should_fail/T16326_Fail10.stderr
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<li class="file-stats">
<a href="#d8ffdc8dc2a88f5597df2257cd4ca89f8390d870">
testsuite/tests/typecheck/should_compile/T10072.stderr
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<li class="file-stats">
<a href="#7c46d0abb66fb7b4cc49c32adff78c4ec7f64517">
testsuite/tests/typecheck/should_fail/tcfail206.stderr
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<h4>Changes:</h4>
<li id="892acbb198a9095c917740d3c1297b56df4e3b7e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#892acbb198a9095c917740d3c1297b56df4e3b7e"><strong>compiler/GHC/Rename/HsType.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">@@ -972,12 +972,12 @@ bindLHsTyVarBndr _doc mb_assoc (L loc</td>
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<pre style="margin: 0;"> <span id="LC972" class="line" lang="haskell"><span class="n" style="color: #333;">bindLHsTyVarBndr</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">mb_assoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindedTyVar</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">lrdr</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">lv</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">kind</span><span class="p">))</span></span>
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973
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973
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<pre style="margin: 0;"> <span id="LC973" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span></span>
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974
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974
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<pre style="margin: 0;"> <span id="LC974" 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;">sig_ok</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">KindSignatures</span></span>
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975
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<td class="diff-line-num new_line old" data-linenumber="975" 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="LC975" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="n" style="color: #333;">sig_ok</span> <span class="p">(</span><span class="n" style="color: #333;">badKindSigErr</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="976" 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">
976
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<td class="diff-line-num new_line old" data-linenumber="975" 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="LC976" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">kind'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsKind</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">kind</span></span>
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<td class="diff-line-num old old_line" data-linenumber="977" 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">
977
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<td class="diff-line-num new_line old" data-linenumber="975" 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="LC977" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="n" style="color: #333;">tv_nm</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTyVarNameRn</span> <span class="n" style="color: #333;">mb_assoc</span> <span class="n" style="color: #333;">lrdr</span></span>
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<td class="diff-line-num old old_line" data-linenumber="978" 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">
978
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<pre style="margin: 0;">-<span id="LC978" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bindLocalNamesFV</span> <span class="p">[</span><span class="n" style="color: #333;">tv_nm</span><span class="p">]</span></span>
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<td class="diff-line-num old old_line" data-linenumber="979" 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">
979
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<pre style="margin: 0;">-<span id="LC979" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">thing_inside</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindedTyVar</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">lv</span> <span class="n" style="color: #333;">tv_nm</span><span class="p">)</span> <span class="n" style="color: #333;">kind'</span><span class="p">))</span></span>
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<td class="diff-line-num old old_line" data-linenumber="980" 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">
980
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<pre style="margin: 0;">-<span id="LC980" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="diff-line-num new old_line" data-linenumber="981" 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="975" 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">
975
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<pre style="margin: 0;">+<span id="LC975" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="n" style="color: #333;">sig_ok</span> <span class="p">(</span><span class="n" style="color: #333;">badKindSigErr</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="976" 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">
976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">kind'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsKind</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">kind</span></span>
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<td class="diff-line-num new new_line" data-linenumber="977" 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">
977
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tv_nm</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTyVarNameRn</span> <span class="n" style="color: #333;">mb_assoc</span> <span class="n" style="color: #333;">lrdr</span></span>
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978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bindLocalNamesFV</span> <span class="p">[</span><span class="n" style="color: #333;">tv_nm</span><span class="p">]</span></span>
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<td class="diff-line-num new new_line" data-linenumber="979" 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="LC979" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">thing_inside</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindedTyVar</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">lv</span> <span class="n" style="color: #333;">tv_nm</span><span class="p">)</span> <span class="n" style="color: #333;">kind'</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC980" 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;">b</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC981" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC982" class="line" lang="haskell"><span class="n" style="color: #333;">newTyVarNameRn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell"><span class="n" style="color: #333;">newTyVarNameRn</span> <span class="n" style="color: #333;">mb_assoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">rdr</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76"><strong>compiler/GHC/Tc/Errors.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -422,10 +422,12 @@ reportImplic ctxt implic@(Implic { ic_skols = tvs</td>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC423" 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="LC424" 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;">"reportImplic"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implic'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">bad_telescope</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">reportBadTelescope</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">tcl_env</span> <span class="n" style="color: #333;">info</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;">+<span id="LC426" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do /not/ use the tidied tvs because then are in the</span></span>
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<pre style="margin: 0;">+<span id="LC427" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wrong order, so tidying will rename things wrongly</span></span>
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">reportWanteds</span> <span class="n" style="color: #333;">ctxt'</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">wanted</span></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">cec_warn_redundant</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC427" class="line" lang="haskell"> <span class="n" style="color: #333;">warnRedundantConstraints</span> <span class="n" style="color: #333;">ctxt'</span> <span class="n" style="color: #333;">tcl_env</span> <span class="n" style="color: #333;">info'</span> <span class="n" style="color: #333;">dead_givens</span></span>
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<pre style="margin: 0;">-<span id="LC428" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">bad_telescope</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">reportBadTelescope</span> <span class="n" style="color: #333;">ctxt'</span> <span class="n" style="color: #333;">tcl_env</span> <span class="n" style="color: #333;">info'</span> <span class="n" style="color: #333;">tvs'</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC430" class="line" lang="haskell"> <span class="n" style="color: #333;">warnRedundantConstraints</span> <span class="n" style="color: #333;">ctxt'</span> <span class="n" style="color: #333;">tcl_env</span> <span class="n" style="color: #333;">info'</span> <span class="n" style="color: #333;">dead_givens</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC432" class="line" lang="haskell"> <span class="n" style="color: #333;">tcl_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ic_env</span> <span class="n" style="color: #333;">implic</span></span>
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"> <span class="n" style="color: #333;">insoluble</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isInsolubleStatus</span> <span class="n" style="color: #333;">status</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#b18f1cc437ab64ccd37a7cae3b8c3f9071aef45e"><strong>compiler/GHC/Tc/Gen/Default.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">@@ -70,8 +70,8 @@ tcDefaults decls@(L locn (DefaultDecl _ _) : _)</td>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="n" style="color: #333;">tc_default_ty</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Class</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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;">Type</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="n" style="color: #333;">tc_default_ty</span> <span class="n" style="color: #333;">deflt_clss</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC73" 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 class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_kind</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveEqualities</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">tcInferLHsType</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC73" 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;"><span class="idiff left right">ty</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveEqualities</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"> <span class="n" style="color: #333;">tcInferLHsType</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"> <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;">zonkTcTypeToType</span> <span class="n" style="color: #333;">ty</span> <span class="c1" style="color: #998; font-style: italic;">-- establish Type invariants</span></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkValidType</span> <span class="kt" style="color: #458; font-weight: 600;">DefaultDeclCtxt</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#902811828741e6bcd64702935bbb54edbbd070ef"><strong>compiler/GHC/Tc/Gen/Expr.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">@@ -436,11 +436,11 @@ tcExpr expr@(SectionR x op arg2) res_ty</td>
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<pre style="margin: 0;"> <span id="LC436" 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;">op'</span><span class="p">,</span> <span class="n" style="color: #333;">op_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferRhoNC</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_fun</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">arg1_ty</span><span class="p">,</span> <span class="n" style="color: #333;">arg2_ty</span><span class="p">],</span> <span class="n" style="color: #333;">op_res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">mk_op_msg</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">fn_orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">op</span><span class="p">))</span> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">op_ty</span></span>
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<pre style="margin: 0;">-<span id="LC439" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wrap_res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubTypeHR</span> <span class="kt" style="color: #458; font-weight: 600;">SectionOrigin</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC440" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkVisFunTy</span> <span class="n" style="color: #333;">arg1_ty</span> <span class="n" style="color: #333;">op_res_ty</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcArg</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">arg2</span> <span class="n" style="color: #333;">arg2_ty</span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;">-<span id="LC442" 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;">mkHsWrap</span> <span class="n" style="color: #333;">wrap_res</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC443" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SectionR</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">mkLHsWrap</span> <span class="n" style="color: #333;">wrap_fun</span> <span class="n" style="color: #333;">op'</span><span class="p">)</span> <span class="n" style="color: #333;">arg2'</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC440" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SectionR</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">mkLHsWrap</span> <span class="n" style="color: #333;">wrap_fun</span> <span class="n" style="color: #333;">op'</span><span class="p">)</span> <span class="n" style="color: #333;">arg2'</span></span>
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<pre style="margin: 0;">+<span id="LC441" class="line" lang="haskell"> <span class="n" style="color: #333;">act_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTy</span> <span class="n" style="color: #333;">arg1_ty</span> <span class="n" style="color: #333;">op_res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC442" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcWrapResultMono</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">expr'</span> <span class="n" style="color: #333;">act_res_ty</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC443" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"> <span class="n" style="color: #333;">fn_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's important to use the origin of 'op', so that call-stacks</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">@@ -456,11 +456,10 @@ tcExpr expr@(SectionL x arg1 op) res_ty</td>
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_fn</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">arg1_ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">arg_tys</span><span class="p">),</span> <span class="n" style="color: #333;">op_res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">mk_op_msg</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">fn_orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">op</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"> <span class="n" style="color: #333;">n_reqd_args</span> <span class="n" style="color: #333;">op_ty</span></span>
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<pre style="margin: 0;">-<span id="LC459" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wrap_res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubTypeHR</span> <span class="kt" style="color: #458; font-weight: 600;">SectionOrigin</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC460" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkVisFunTys</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">op_res_ty</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC459" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg1'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcArg</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">arg1</span> <span class="n" style="color: #333;">arg1_ty</span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">-<span id="LC462" 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;">mkHsWrap</span> <span class="n" style="color: #333;">wrap_res</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC463" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SectionL</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">arg1'</span> <span class="p">(</span><span class="n" style="color: #333;">mkLHsWrap</span> <span class="n" style="color: #333;">wrap_fn</span> <span class="n" style="color: #333;">op'</span><span class="p">)</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC460" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SectionL</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">arg1'</span> <span class="p">(</span><span class="n" style="color: #333;">mkLHsWrap</span> <span class="n" style="color: #333;">wrap_fn</span> <span class="n" style="color: #333;">op'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC461" class="line" lang="haskell"> <span class="n" style="color: #333;">act_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">op_res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC462" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcWrapResultMono</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">expr'</span> <span class="n" style="color: #333;">act_res_ty</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"> <span class="n" style="color: #333;">fn_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">op</span></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;">-- It's important to use the origin of 'op', so that call-stacks</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">@@ -490,18 +489,17 @@ tcExpr expr@(ExplicitTuple x tup_args boxity) res_ty</td>
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">boxity</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">Boxed</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">newFlexiTyVarTys</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">Unboxed</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">replicateM</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">newOpenFlexiTyVarTy</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC493" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">actual_res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC494" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="p">[</span><span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Missing</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;">arg_tys</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">tup_args</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC495" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTupleTy1</span> <span class="n" style="color: #333;">boxity</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC496" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Don't flatten tuples from HsSyn] in GHC.Core.Make</span></span>
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<pre style="margin: 0;">-<span id="LC497" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC498" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubTypeHR</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Shouldn'tHappenOrigin</span> <span class="s" style="color: #d14;">"ExpTuple"</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC499" class="line" lang="haskell"> <span class="n" style="color: #333;">actual_res_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Handle tuple sections where</span></span>
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tup_args1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcTupArgs</span> <span class="n" style="color: #333;">tup_args</span> <span class="n" style="color: #333;">arg_tys</span></span>
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkHsWrap</span> <span class="n" style="color: #333;">wrap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExplicitTuple</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">tup_args1</span> <span class="n" style="color: #333;">boxity</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExplicitTuple</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">tup_args1</span> <span class="n" style="color: #333;">boxity</span></span>
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<pre style="margin: 0;">+<span id="LC497" class="line" lang="haskell"> <span class="n" style="color: #333;">act_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="p">[</span><span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Missing</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)))</span></span>
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<pre style="margin: 0;">+<span id="LC498" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">arg_tys</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">tup_args</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC499" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTupleTy1</span> <span class="n" style="color: #333;">boxity</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC500" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Don't flatten tuples from HsSyn] in GHC.Core.Make</span></span>
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC502" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcWrapResultMono</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">expr'</span> <span class="n" style="color: #333;">act_res_ty</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC504" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExplicitSum</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC505" 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="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">sum_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sumTyCon</span> <span class="n" style="color: #333;">arity</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">@@ -673,25 +671,26 @@ tcExpr expr@(RecordCon { rcon_con_name = L loc con_name</td>
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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;">checkMissingFields</span> <span class="n" style="color: #333;">con_like</span> <span class="n" style="color: #333;">rbinds</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="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">con_expr</span><span class="p">,</span> <span class="n" style="color: #333;">con_sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferId</span> <span class="n" style="color: #333;">con_name</span></span>
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<pre style="margin: 0;">-<span id="LC676" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">con_wrap</span><span class="p">,</span> <span class="n" style="color: #333;">con_tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span></span>
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<pre style="margin: 0;">-<span id="LC677" class="line" lang="haskell"> <span class="n" style="color: #333;">topInstantiate</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OccurrenceOf</span> <span class="n" style="color: #333;">con_name</span><span class="p">)</span> <span class="n" style="color: #333;">con_sigma</span></span>
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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="n" style="color: #333;">con_wrap</span><span class="p">,</span> <span class="n" style="color: #333;">con_tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topInstantiate</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">con_sigma</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;">-- a shallow instantiation should really be enough for</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;">-- a data constructor.</span></span>
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<pre style="margin: 0;"> <span id="LC677" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">conLikeArity</span> <span class="n" style="color: #333;">con_like</span></span>
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<pre style="margin: 0;"> <span id="LC678" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="p">(</span><span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">actual_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitFunTysN</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">con_tau</span></span>
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<pre style="margin: 0;">-<span id="LC682" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">conLikeWrapId_maybe</span> <span class="n" style="color: #333;">con_like</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">nonBidirectionalErr</span> <span class="p">(</span><span class="n" style="color: #333;">conLikeName</span> <span class="n" style="color: #333;">con_like</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC684" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">con_id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC685" class="line" lang="haskell"> <span class="n" style="color: #333;">res_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubTypeHR</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Shouldn'tHappenOrigin</span> <span class="s" style="color: #d14;">"RecordCon"</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC686" class="line" lang="haskell"> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">actual_res_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC687" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rbinds'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcRecordBinds</span> <span class="n" style="color: #333;">con_like</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">rbinds</span></span>
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC689" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsWrap</span> <span class="n" style="color: #333;">res_wrap</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC690" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RecordCon</span> <span class="p">{</span> <span class="n" style="color: #333;">rcon_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RecordConTc</span></span>
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">rcon_con_like</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">con_like</span></span>
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rcon_con_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkHsWrap</span> <span class="n" style="color: #333;">con_wrap</span> <span class="n" style="color: #333;">con_expr</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rcon_con_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">con_id</span></span>
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<pre style="margin: 0;">-<span id="LC694" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rcon_flds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rbinds'</span> <span class="p">}</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">conLikeWrapId_maybe</span> <span class="n" style="color: #333;">con_like</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">nonBidirectionalErr</span> <span class="p">(</span><span class="n" style="color: #333;">conLikeName</span> <span class="n" style="color: #333;">con_like</span><span class="p">)</span> <span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">con_id</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rbinds'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcRecordBinds</span> <span class="n" style="color: #333;">con_like</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">rbinds</span></span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rcon_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RecordConTc</span></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">rcon_con_like</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">con_like</span></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rcon_con_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkHsWrap</span> <span class="n" style="color: #333;">con_wrap</span> <span class="n" style="color: #333;">con_expr</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="haskell"> <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RecordCon</span> <span class="p">{</span> <span class="n" style="color: #333;">rcon_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rcon_tc</span></span>
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rcon_con_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">con_id</span></span>
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rcon_flds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rbinds'</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcWrapResultMono</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">expr'</span> <span class="n" style="color: #333;">actual_res_ty</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"> <span class="n" style="color: #333;">orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OccurrenceOf</span> <span class="n" style="color: #333;">con_name</span></span>
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694
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC695" 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="LC696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Type of a record update]</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="941" 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">@@ -942,8 +941,6 @@ tcExpr expr@(RecordUpd { rupd_expr = record_expr, rupd_flds = rbnds }) res_ty</td>
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942
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<pre style="margin: 0;"> <span id="LC941" class="line" lang="haskell"> <span class="n" style="color: #333;">scrut_ty</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="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">scrut_subst</span> <span class="n" style="color: #333;">con1_res_ty</span></span>
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943
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942
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<pre style="margin: 0;"> <span id="LC942" class="line" lang="haskell"> <span class="n" style="color: #333;">con1_arg_tys'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">result_subst</span><span class="p">)</span> <span class="n" style="color: #333;">con1_arg_tys</span></span>
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944
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943
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<pre style="margin: 0;"> <span id="LC943" class="line" lang="haskell"></span>
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945
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<pre style="margin: 0;">-<span id="LC945" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wrap_res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubTypeHR</span> <span class="p">(</span><span class="n" style="color: #333;">exprCtOrigin</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span></span>
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946
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"> <span class="n" style="color: #333;">rec_res_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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947
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944
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<pre style="margin: 0;"> <span id="LC944" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">co_scrut</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">record_expr</span><span class="p">))</span> <span class="n" style="color: #333;">record_rho</span> <span class="n" style="color: #333;">scrut_ty</span></span>
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948
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<pre style="margin: 0;"> <span id="LC945" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: normal unification is OK here (as opposed to subsumption),</span></span>
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949
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946
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<pre style="margin: 0;"> <span id="LC946" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because for this to work out, both record_rho and scrut_ty have</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">@@ -973,16 +970,16 @@ tcExpr expr@(RecordUpd { rupd_expr = record_expr, rupd_flds = rbnds }) res_ty</td>
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973
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970
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<pre style="margin: 0;"> <span id="LC970" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">req_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">instCallConstraints</span> <span class="kt" style="color: #458; font-weight: 600;">RecordUpdOrigin</span> <span class="n" style="color: #333;">req_theta'</span></span>
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974
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971
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="haskell"></span>
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975
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972
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<pre style="margin: 0;"> <span id="LC972" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Phew!</span></span>
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976
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<pre style="margin: 0;">-<span id="LC976" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">return</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">$</span></span></span>
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977
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<pre style="margin: 0;">-<span id="LC977" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">mkHsWrap</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wrap_res</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">$</span></span></span>
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<pre style="margin: 0;">-<span id="LC978" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">RecordUpd</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 right">rupd_expr</span></span></span>
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<td class="diff-line-num old old_line" data-linenumber="979" 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">
979
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<pre style="margin: 0;">-<span id="LC979" class="line" lang="haskell"> <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">mkLHsWrap</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_co</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkLHsWrapCo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">co_scrut</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">record_expr'</span></span><span class="p"><span class="idiff right">)</span></span></span>
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980
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<pre style="margin: 0;">-<span id="LC980" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rupd_flds</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">rbinds'</span></span></span>
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981
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<td class="diff-line-num new_line old" data-linenumber="973" 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="LC981" 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">rupd_ext</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">RecordUpdTc</span></span></span>
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982
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<td class="diff-line-num new_line old" data-linenumber="973" 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="LC982" 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">rupd_cons</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">relevant_cons</span></span></span>
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983
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<pre style="margin: 0;">-<span id="LC983" 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">rupd_in_tys</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">scrut_inst_tys</span></span></span>
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984
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<pre style="margin: 0;">-<span id="LC984" class="line" lang="haskell"><span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rupd_out_tys</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">result_inst_tys</span></span></span>
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<td class="diff-line-num old old_line" data-linenumber="985" 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">
985
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<td class="diff-line-num new_line old" data-linenumber="973" 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="LC985" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rupd_wrap</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">req_wrap</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}}</span></span> <span class="p">}</span></span>
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973
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">upd_tc</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">RecordUpdTc</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">rupd_cons</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">relevant_cons</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="974" 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">
974
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<pre style="margin: 0;">+<span id="LC974" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rupd_in_tys</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">scrut_inst_tys</span></span></span>
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975
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<pre style="margin: 0;">+<span id="LC975" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rupd_out_tys</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">result_inst_tys</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="976" 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">
976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rupd_wrap</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">req_wrap</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="977" 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">
977
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">expr'</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">RecordUpd</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">rupd_expr</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">mkLHsWrap</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_co</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">$</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="978" 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">
978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">mkLHsWrapCo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">co_scrut</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">record_expr'</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="979" 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">
979
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rupd_flds</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">rbinds'</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="980" 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">
980
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rupd_ext</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">upd_tc</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="981" 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">
981
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"></span>
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982
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<pre style="margin: 0;">+<span id="LC982" 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">tcWrapResult</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">expr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">expr'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rec_res_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">res_ty</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC984" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC985" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcCheckRecSelId</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">res_ty</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1401,9 +1398,9 @@ tcArgs fun orig_fun_ty orig_args</td>
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<pre style="margin: 0;"> <span id="LC1398" 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;">ty_app_err</span> <span class="n" style="color: #333;">upsilon_ty</span> <span class="n" style="color: #333;">hs_ty_arg</span> <span class="p">}</span></span>
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1399
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<pre style="margin: 0;"> <span id="LC1399" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1400" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">so_far</span> <span class="n" style="color: #333;">fun_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsEValArg</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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1404
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<pre style="margin: 0;">-<span id="LC1404" 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;">wrap</span><span class="p">,</span> <span class="p"><span class="idiff left">[</span></span><span class="n" style="color: #333;"><span class="idiff">arg_ty</span></span><span class="p"><span class="idiff right">]</span>,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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1405
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<pre style="margin: 0;">-<span id="LC1405" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTy<span class="idiff left right">sPart</span></span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">fun_orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1406" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">n_val_args</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">so_far</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff right">1</span></span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1401" 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;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">arg_ty</span></span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1402" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTy</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">fun_orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1403" class="line" lang="haskell"> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">n_val_args</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">so_far</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1404" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcArg</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">arg_ty</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;"> <span id="LC1405" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">args'</span><span class="p">,</span> <span class="n" style="color: #333;">inner_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">arg_ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">so_far</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC1406" 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;">addArgWrap</span> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsEValArg</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">arg'</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">args'</span></span>
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<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="419" 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="419" 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">@@ -419,7 +419,7 @@ tcStandaloneKindSig (L _ kisig) = case kisig of</td>
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419
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<pre style="margin: 0;"> <span id="LC419" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="n" style="color: #333;">ksig</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSigCtxt</span> <span class="n" style="color: #333;">name</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="haskell"> <span class="n" style="color: #333;">addSigCtxt</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="n" style="color: #333;">hsSigType</span> <span class="n" style="color: #333;">ksig</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC422" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;"><span class="idiff left">mode</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">mkTcTy</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span></span>
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<pre style="margin: 0;">+<span id="LC422" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mode</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">mk</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span></span>
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<pre style="margin: 0;"> <span id="LC423" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ksig</span> <span class="p">(</span><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC424" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkValidType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;"> <span id="LC425" 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;">name</span><span class="p">,</span> <span class="n" style="color: #333;">kind</span><span class="p">)</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">@@ -427,8 +427,7 @@ tcStandaloneKindSig (L _ kisig) = case kisig of</td>
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"><span class="n" style="color: #333;">tcTopLHsType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ContextKind</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;">Type</span></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"><span class="n" style="color: #333;">tcTopLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">ctxt_kind</span></span>
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<pre style="margin: 0;">-<span id="LC430" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkTcTyMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>
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<pre style="margin: 0;">-<span id="LC431" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">ctxt_kind</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC430" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="p">(</span><span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span><span class="p">)</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">ctxt_kind</span></span>
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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC432" class="line" lang="haskell"><span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ContextKind</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;">Type</span></span>
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tcTopLHsType is used for kind-checking top-level HsType 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">@@ -522,7 +521,7 @@ tcHsTypeApp :: LHsWcType GhcRn -> Kind -> TcM Type</td>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Recipe for checking a signature] in GHC.Tc.Gen.HsType</span></span>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsTypeApp</span> <span class="n" style="color: #333;">wc_ty</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="p">{</span> <span class="n" style="color: #333;">hswc_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hswc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wc_ty</span></span>
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<pre style="margin: 0;">-<span id="LC525" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span></span>
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<pre style="margin: 0;">+<span id="LC524" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left right">Hole</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span></span>
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- HM_VTA: See Note [Wildcards in visible type application]</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"> <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;">addTypeCtxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="haskell"> <span class="n" style="color: #333;">solveLocalEqualities</span> <span class="s" style="color: #d14;">"tcHsTypeApp"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -584,7 +583,7 @@ tcFamTyPats fam_tc hs_pats</td>
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcFamTyPats {"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"arity:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_arity</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC587" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</span></span>
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left right">Hole</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</span></span>
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<pre style="margin: 0;"> <span id="LC587" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- HM_FamPat: See Note [Wildcards in family instances] in</span></span>
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<pre style="margin: 0;"> <span id="LC588" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Rename.Module</span></span>
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<pre style="margin: 0;"> <span id="LC589" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fun_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="kt" style="color: #458; 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">@@ -626,27 +625,28 @@ tcCheckLHsType hs_ty exp_kind</td>
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<pre style="margin: 0;"> <span id="LC625" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newExpectedKind</span> <span class="n" style="color: #333;">exp_kind</span></span>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">ek</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC629" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcType</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">TcKind</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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;"><span class="idiff left right">TcType</span></span></span>
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Called from outside: set the context</span></span>
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<pre style="margin: 0;">-<span id="LC631" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addTypeCtxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC632" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkTcTyMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>
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<pre style="margin: 0;">-<span id="LC633" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_infer_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsType</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addTypeCtxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC632" 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;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_infer_lhs_type</span> <span class="p">(</span><span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span><span class="p">)</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC635" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Like tcInferLHsType, but use it in a context where type synonyms and type families</span></span>
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<pre style="margin: 0;">-<span id="LC636" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- do not need to be saturated, like in a GHCi :kind call</span></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used to check the argument of GHCi :kind</span></span>
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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Allow and report wildcards, e.g. :kind T _</span></span>
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<pre style="margin: 0;">+<span id="LC637" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do not saturate family applications: see Note [Dealing with :kind]</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsTypeUnsaturated</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsTypeUnsaturated</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC639" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">hs_fun_ty</span><span class="p">,</span> <span class="n" style="color: #333;">hs_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitHsAppTys</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addTypeCtxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left">TcTyMode</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">TypeLevel</span></span></span>
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<pre style="margin: 0;">-<span id="LC642" class="line" lang="haskell"> <span class="p">;</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">fun_ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_ki</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">tcInferAppHead</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mode</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hs_fun_ty</span></span></span>
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<pre style="margin: 0;">-<span id="LC643" 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">tcInferTyApps_nosat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mode</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_fun_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fun_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_args</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- Notice the 'nosat'; do not instantiate trailing</span></span></span>
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<pre style="margin: 0;">-<span id="LC645" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- invisible arguments of a type family.</span></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;"><span class="idiff left right">-- See Note [Dealing with :kind]</span></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="LC648" class="line" lang="haskell"> <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 right">otherwise</span></span></span>
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<pre style="margin: 0;">-<span id="LC649" class="line" lang="haskell"> <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">tcInferLHsType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hs_ty</span></span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left">HoleMode</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TypeLevel</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HM_Sig</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Allow and report holes</span></span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">splitHsAppTys</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_ty</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">of</span></span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">hs_fun_ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_args</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">do</span></span><span class="idiff"> </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">fun_ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_ki</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">tcInferTyAppHead</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mode</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hs_fun_ty</span></span></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tcInferTyApps_nosat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mode</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_fun_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fun_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_args</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Notice the 'nosat'; do not instantiate trailing</span></span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- invisible arguments of a type family.</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- See Note [Dealing with :kind]</span></span></span>
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nothing</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">tc_infer_lhs_type</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mode</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_ty</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Dealing with :kind]</span></span>
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<pre style="margin: 0;"> <span id="LC652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -695,46 +695,39 @@ data TcTyMode</td>
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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="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span></span>
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696
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<pre style="margin: 0;"> <span id="LC696" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Levels for wildcards]</span></span>
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<pre style="margin: 0;">-<span id="LC698" 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">mode_lvl</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">TcLevel</span></span></span>
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<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">HoleMode</span></span></span>
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- Nothing <=> no wildcards expected</span></span></span>
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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Maybe</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">TcLevel</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">HoleMode</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- HoleMode says how to treat the occurrences</span></span>
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of anonymous wildcards; see tcAnonWildCardOcc</span></span>
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<pre style="margin: 0;">-<span id="LC704" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HoleMode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HM_NoHoles</span> <span class="c1" style="color: #998; font-style: italic;">-- No wildcard expected</span></span>
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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;">HM_Sig</span> <span class="c1" style="color: #998; font-style: italic;">-- Partial type signatures: f :: _ -> Int</span></span>
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HoleMode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span> <span class="c1" style="color: #998; font-style: italic;">-- Partial type signatures: f :: _ -> Int</span></span>
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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;">HM_FamPat</span> <span class="c1" style="color: #998; font-style: italic;">-- Family instances: F _ Int = Bool</span></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span> <span class="c1" style="color: #998; font-style: italic;">-- Visible type and kind application:</span></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- f @(Maybe _)</span></span>
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Maybe @(_ -> _)</span></span>
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<pre style="margin: 0;"> <span id="LC709" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC711" class="line" lang="haskell"><span class="n" style="color: #333;">holesOK</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HoleMode</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="LC712" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True <=> it's ok to encounter a hole</span></span>
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<pre style="margin: 0;">-<span id="LC713" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Should have been checked by the renamer</span></span>
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<pre style="margin: 0;">-<span id="LC714" class="line" lang="haskell"><span class="n" style="color: #333;">holesOK</span> <span class="kt" style="color: #458; font-weight: 600;">HM_NoHoles</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="LC715" class="line" lang="haskell"><span class="n" style="color: #333;">holesOK</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="LC710" class="line" lang="haskell"><span class="n" style="color: #333;">mkMode</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;">TcTyMode</span></span>
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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"><span class="n" style="color: #333;">mkMode</span> <span class="n" style="color: #333;">tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyki</span><span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC717" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcTyMode</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;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span></span>
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<pre style="margin: 0;">-<span id="LC718" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcTyMode</span> <span class="n" style="color: #333;">tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkMode</span> <span class="n" style="color: #333;">tyki</span> <span class="kt" style="color: #458; font-weight: 600;">HM_NoHoles</span></span>
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<pre style="margin: 0;">-<span id="LC719" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC720" class="line" lang="haskell"><span class="n" style="color: #333;">mkMode</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;">HoleMode</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;">TcTyMode</span></span>
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<pre style="margin: 0;">-<span id="LC721" class="line" lang="haskell"><span class="n" style="color: #333;">mkMode</span> <span class="n" style="color: #333;">tyki</span> <span class="n" style="color: #333;">hm</span></span>
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"><span class="n" style="color: #333;">mkHoleMode</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;">HoleMode</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;">TcTyMode</span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"><span class="n" style="color: #333;">mkHoleMode</span> <span class="n" style="color: #333;">tyki</span> <span class="n" style="color: #333;">hm</span></span>
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<pre style="margin: 0;"> <span id="LC715" 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;">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="LC716" 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;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyki</span></span>
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<pre style="margin: 0;">-<span id="LC724" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mode_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lvl</span></span>
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<pre style="margin: 0;">-<span id="LC725" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hm</span> <span class="p">})</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="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">lvl</span><span class="p">,</span><span class="n" style="color: #333;">hm</span><span class="p">)</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"><span class="n" style="color: #333;">kindLevel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span></span>
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"><span class="n" style="color: #333;">kindLevel</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC722" 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;">HoleMode</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC728" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">HM_NoHoles</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HM_NoHoles"</span></span>
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HM_Sig"</span></span>
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HM_FamPat"</span></span>
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<pre style="margin: 0;"> <span id="LC725" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HM_VTA"</span></span>
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726
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<pre style="margin: 0;"> <span id="LC726" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC727" 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;">TcTyMode</span> <span class="kr" style="font-weight: 600;">where</span></span>
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734
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<pre style="margin: 0;">-<span id="LC734" 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;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyki</span><span class="p">,</span> <span class="n" style="color: #333;">mode_<span class="idiff left">lvl</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">lvl</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mode_</span>holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hm</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC728" 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;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyki</span><span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hm</span> <span class="p">})</span></span>
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735
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<pre style="margin: 0;"> <span id="LC729" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"TcTyMode"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyki</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">comma</span></span>
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<pre style="margin: 0;">-<span id="LC736" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hm</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">comma</span></span>
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737
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"lvl:"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lvl</span> <span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hm</span> <span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC732" 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="LC733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Bidirectional type checking]</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">@@ -809,7 +802,7 @@ tc_infer_hs_type mode (HsParTy _ t)</td>
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802
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<pre style="margin: 0;"> <span id="LC802" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC803" class="line" lang="haskell"><span class="n" style="color: #333;">tc_infer_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">hs_fun_ty</span><span class="p">,</span> <span class="n" style="color: #333;">hs_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitHsAppTys</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC812" 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;">fun_ty</span><span class="p">,</span> <span class="n" style="color: #333;">_ki</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC805" 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;">fun_ty</span><span class="p">,</span> <span class="n" style="color: #333;">_ki</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInfer<span class="idiff left right">Ty</span>AppHead</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_fun_ty</span></span>
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcInferTyApps</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_fun_ty</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">hs_args</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"></span>
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808
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"><span class="n" style="color: #333;">tc_infer_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsKindSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">sig</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">@@ -850,8 +843,7 @@ tc_infer_hs_type mode other_ty</td>
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------</span></span>
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</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;">TcType</span></span>
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852
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845
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">exp_kind</span></span>
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<pre style="margin: 0;">-<span id="LC853" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkTcTyMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>
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<pre style="margin: 0;">-<span id="LC854" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">exp_kind</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_lhs_type</span> <span class="p">(</span><span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span><span class="p">)</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">exp_kind</span></span>
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847
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"><span class="n" style="color: #333;">tc_lhs_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</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;">TcType</span></span>
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849
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"><span class="n" style="color: #333;">tc_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">span</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">exp_kind</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">@@ -906,9 +898,13 @@ tc_hs_type mode (HsOpTy _ ty1 (L _ op) ty2) exp_kind</td>
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<pre style="margin: 0;"> <span id="LC898" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">forall</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_fvf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvf</span><span class="p">,</span> <span class="n" style="color: #333;">hst_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_tvs</span></span>
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899
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<pre style="margin: 0;"> <span id="LC899" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hst_body</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;">exp_kind</span></span>
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<pre style="margin: 0;"> <span id="LC900" 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;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">tvs'</span><span class="p">,</span> <span class="n" style="color: #333;">ty'</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC909" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelAndCaptureConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC910" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">hs_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC901" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelAndCaptureConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC902" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Skol_M</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC903" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The _M variant passes on the mode from the type, to</span></span>
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- any wildards in kind signatures on the forall'd variables</span></span>
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<pre style="margin: 0;">+<span id="LC905" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. f :: _ -> Int -> forall (a :: _). blah</span></span>
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<pre style="margin: 0;"> <span id="LC906" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">exp_kind</span></span>
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<pre style="margin: 0;">+<span id="LC907" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC908" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do not kind-generalise here! See Note [Kind generalisation]</span></span>
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909
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<pre style="margin: 0;"> <span id="LC909" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Why exp_kind? See Note [Body kind of HsForAllTy]</span></span>
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<pre style="margin: 0;"> <span id="LC910" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">argf</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">fvf</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1243,14 +1239,14 @@ splitHsAppTys hs_ty</td>
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<pre style="margin: 0;"> <span id="LC1239" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">as</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="n" style="color: #333;">as</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1240" class="line" lang="haskell"></span>
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1241
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<pre style="margin: 0;"> <span id="LC1241" 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="LC1246" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAppHead</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1242" class="line" lang="haskell"><span class="n" style="color: #333;">tcInfer<span class="idiff left right">Ty</span>AppHead</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1243" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Version of tc_infer_lhs_type specialised for the head of an</span></span>
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<pre style="margin: 0;"> <span id="LC1244" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- application. In particular, for a HsTyVar (which includes type</span></span>
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<pre style="margin: 0;"> <span id="LC1245" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constructors, it does not zoom off into tcInferTyApps and family</span></span>
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<pre style="margin: 0;"> <span id="LC1246" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- saturation</span></span>
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<pre style="margin: 0;">-<span id="LC1251" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">mode</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTyVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tv</span><span class="p">)))</span></span>
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<pre style="margin: 0;">+<span id="LC1247" class="line" lang="haskell"><span class="n" style="color: #333;">tcInfer<span class="idiff left right">Ty</span>AppHead</span> <span class="n" style="color: #333;">mode</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTyVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tv</span><span class="p">)))</span></span>
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<pre style="margin: 0;"> <span id="LC1248" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTyVar</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">-<span id="LC1253" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1249" class="line" lang="haskell"><span class="n" style="color: #333;">tcInfer<span class="idiff left right">Ty</span>AppHead</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1250" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1251" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1252" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1333" 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">@@ -1337,8 +1333,7 @@ tcInferTyApps_nosat mode orig_hs_ty fun orig_hs_args</td>
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1333
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<pre style="margin: 0;"> <span id="LC1333" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">subst</span> <span class="p">])</span></span>
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1334
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<pre style="margin: 0;"> <span id="LC1334" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1335" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">exp_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tyBinderType</span> <span class="n" style="color: #333;">ki_binder</span></span>
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<pre style="margin: 0;">-<span id="LC1340" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span></span>
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<pre style="margin: 0;">-<span id="LC1341" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1336" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg_mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkHoleMode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span></span>
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<pre style="margin: 0;"> <span id="LC1337" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- HM_VKA: see Note [Wildcards in visible kind application]</span></span>
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<pre style="margin: 0;"> <span id="LC1338" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ki_arg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">funAppCtxt</span> <span class="n" style="color: #333;">orig_hs_ty</span> <span class="n" style="color: #333;">hs_ki_arg</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1339" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_lhs_type</span> <span class="n" style="color: #333;">arg_mode</span> <span class="n" style="color: #333;">hs_ki_arg</span> <span class="n" style="color: #333;">exp_kind</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1649" 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">@@ -1654,12 +1649,10 @@ tcHsMbContext Nothing = return []</td>
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<pre style="margin: 0;"> <span id="LC1649" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsMbContext</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cxt</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">cxt</span></span>
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<pre style="margin: 0;"> <span id="LC1650" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1651" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsContext</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PredType</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC1657" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">cxt</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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkTcTyMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>
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<pre style="margin: 0;">-<span id="LC1658" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_hs_context</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">cxt</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1652" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">cxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_hs_context</span> <span class="p">(</span><span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span><span class="p">)</span> <span class="n" style="color: #333;">cxt</span></span>
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1653
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<pre style="margin: 0;"> <span id="LC1653" class="line" lang="haskell"></span>
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1654
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<pre style="margin: 0;"> <span id="LC1654" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsPredType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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;">PredType</span></span>
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<pre style="margin: 0;">-<span id="LC1661" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsPredType</span> <span class="n" style="color: #333;">pred</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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkTcTyMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>
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1662
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<pre style="margin: 0;">-<span id="LC1662" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_lhs_pred</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">pred</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1655" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsPredType</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_lhs_pred</span> <span class="p">(</span><span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span><span class="p">)</span> <span class="n" style="color: #333;">pred</span></span>
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1663
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1656
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<pre style="margin: 0;"> <span id="LC1656" class="line" lang="haskell"></span>
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1657
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<pre style="margin: 0;"> <span id="LC1657" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_context</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PredType</span><span class="p">]</span></span>
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1658
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<pre style="margin: 0;"> <span id="LC1658" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_context</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ctxt</span> <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;">tc_lhs_pred</span> <span class="n" style="color: #333;">mode</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">ctxt</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">@@ -1899,20 +1892,19 @@ newNamedWildTyVar _name -- Currently ignoring the "_x" wildcard name used in t</td>
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1892
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<pre style="margin: 0;"> <span id="LC1892" class="line" lang="haskell"></span>
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1893
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<pre style="margin: 0;"> <span id="LC1893" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC1894" class="line" lang="haskell"><span class="n" style="color: #333;">tcAnonWildCardOcc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</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;">TcType</span></span>
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<pre style="margin: 0;">-<span id="LC1902" class="line" lang="haskell"><span class="n" style="color: #333;">tcAnonWildCardOcc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_<span class="idiff left">lvl</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">lvl</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mode_holes</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">hole_mode</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1895" class="line" lang="haskell"><span class="n" style="color: #333;">tcAnonWildCardOcc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_<span class="idiff left">holes</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">Just</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">hole_lvl</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hole_mode</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC1896" class="line" lang="haskell"> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">exp_kind</span></span>
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1904
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<pre style="margin: 0;">-<span id="LC1904" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mode_lvl field: see Note [Checking partial type signatures]</span></span>
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<pre style="margin: 0;">-<span id="LC1905" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- esp the bullet on nested forall types</span></span>
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1906
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<pre style="margin: 0;">-<span id="LC1906" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">holesOK</span> <span class="n" style="color: #333;">hole_mode</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1907" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kv_details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTauTvDetailsAtLevel</span> <span class="n" style="color: #333;">lvl</span></span>
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1897
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<pre style="margin: 0;">+<span id="LC1897" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hole_lvl: see Note [Checking partial type signatures]</span></span>
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1898
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<pre style="margin: 0;">+<span id="LC1898" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- esp the bullet on nested forall types</span></span>
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1899
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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;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kv_details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTauTvDetailsAtLevel</span> <span class="n" style="color: #333;">hole_lvl</span></span>
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1908
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1900
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<pre style="margin: 0;"> <span id="LC1900" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kv_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVarName</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"k"</span><span class="p">)</span></span>
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1909
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<pre style="margin: 0;">-<span id="LC1909" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wc_details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTauTvDetailsAtLevel</span> <span class="n" style="color: #333;">lvl</span></span>
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1901
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<pre style="margin: 0;">+<span id="LC1901" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wc_details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTauTvDetailsAtLevel</span> <span class="n" style="color: #333;"><span class="idiff left right">hole_</span>lvl</span></span>
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1910
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1902
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<pre style="margin: 0;"> <span id="LC1902" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wc_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVarName</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="n" style="color: #333;">wc_nm</span><span class="p">)</span></span>
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1911
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1903
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<pre style="margin: 0;"> <span id="LC1903" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">kv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyVar</span> <span class="n" style="color: #333;">kv_name</span> <span class="n" style="color: #333;">liftedTypeKind</span> <span class="n" style="color: #333;">kv_details</span></span>
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1912
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1904
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<pre style="margin: 0;"> <span id="LC1904" class="line" lang="haskell"> <span class="n" style="color: #333;">wc_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">kv</span></span>
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1913
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1905
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<pre style="margin: 0;"> <span id="LC1905" class="line" lang="haskell"> <span class="n" style="color: #333;">wc_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyVar</span> <span class="n" style="color: #333;">wc_name</span> <span class="n" style="color: #333;">wc_kind</span> <span class="n" style="color: #333;">wc_details</span></span>
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1914
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1906
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<pre style="margin: 0;"> <span id="LC1906" class="line" lang="haskell"></span>
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1915
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<pre style="margin: 0;">-<span id="LC1915" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcAnonWildCardOcc"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lvl</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">emit_holes</span><span class="p">)</span></span>
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1907
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<pre style="margin: 0;">+<span id="LC1907" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcAnonWildCardOcc"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left right">hole_</span>lvl</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">emit_holes</span><span class="p">)</span></span>
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1916
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1908
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<pre style="margin: 0;"> <span id="LC1908" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">emit_holes</span> <span class="o" style="font-weight: 600;">$</span></span>
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1917
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1909
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<pre style="margin: 0;"> <span id="LC1909" class="line" lang="haskell"> <span class="n" style="color: #333;">emitAnonWildCardHoleConstraint</span> <span class="n" style="color: #333;">wc_tv</span></span>
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1918
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1910
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<pre style="margin: 0;"> <span id="LC1910" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Why the 'when' guard?</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1926" 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="1918" 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">@@ -1926,14 +1918,19 @@ tcAnonWildCardOcc (TcTyMode { mode_lvl = lvl, mode_holes = hole_mode })</td>
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1926
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1918
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<pre style="margin: 0;"> <span id="LC1918" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1927
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1919
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<pre style="margin: 0;"> <span id="LC1919" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wildcard names]</span></span>
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1928
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1920
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<pre style="margin: 0;"> <span id="LC1920" class="line" lang="haskell"> <span class="n" style="color: #333;">wc_nm</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">hole_mode</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1929
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<pre style="margin: 0;">-<span id="LC1929" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"w"</span></span>
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<pre style="margin: 0;">-<span id="LC1930" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"_"</span></span>
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<pre style="margin: 0;">-<span id="LC1931" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"w"</span></span>
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1921
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<pre style="margin: 0;">+<span id="LC1921" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"w"</span></span>
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1922
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<pre style="margin: 0;">+<span id="LC1922" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"_"</span></span>
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1923
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<pre style="margin: 0;">+<span id="LC1923" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"w"</span></span>
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1932
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1924
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<pre style="margin: 0;"> <span id="LC1924" class="line" lang="haskell"></span>
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1933
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1925
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<pre style="margin: 0;"> <span id="LC1925" class="line" lang="haskell"> <span class="n" style="color: #333;">emit_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">hole_mode</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1934
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<pre style="margin: 0;">-<span id="LC1934" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</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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1935
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<pre style="margin: 0;">-<span id="LC1935" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</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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1936
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<pre style="margin: 0;">-<span id="LC1936" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</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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1926
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<pre style="margin: 0;">+<span id="LC1926" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</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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1927
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<pre style="margin: 0;">+<span id="LC1927" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</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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1928
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<pre style="margin: 0;">+<span id="LC1928" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</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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1929
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<pre style="margin: 0;">+<span id="LC1929" class="line" lang="haskell"></span>
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1930
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<pre style="margin: 0;">+<span id="LC1930" class="line" lang="haskell"><span class="n" style="color: #333;">tcAnonWildCardOcc</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">+<span id="LC1931" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mode_holes is Nothing. Should not happen, because renamer</span></span>
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1932
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<pre style="margin: 0;">+<span id="LC1932" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- should already have rejected holes in unexpected places</span></span>
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1933
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<pre style="margin: 0;">+<span id="LC1933" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"tcWildCardOcc"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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1937
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1934
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<pre style="margin: 0;"> <span id="LC1934" class="line" lang="haskell"></span>
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1935
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<pre style="margin: 0;"> <span id="LC1935" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Wildcard names]</span></span>
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1939
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1936
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<pre style="margin: 0;"> <span id="LC1936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2822,9 +2819,16 @@ bindExplicitTKBndrs_Skol, bindExplicitTKBndrs_Tv</td>
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<pre style="margin: 0;"> <span id="LC2819" 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;">LHsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2820" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC2821" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">],</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2822" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Skol_M</span><span class="p">,</span> <span class="n" style="color: #333;">bindExplicitTKBndrs_Tv_M</span></span>
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<pre style="margin: 0;">+<span id="LC2823" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span></span>
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<pre style="margin: 0;">+<span id="LC2824" 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;">LHsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC2825" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC2826" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">],</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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2825
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2827
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<pre style="margin: 0;"> <span id="LC2827" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2826" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Skol</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">tcHsTyVarBndr</span> <span class="n" style="color: #333;">newSkolemTyVar</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2827" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">tcHsTyVarBndr</span> <span class="n" style="color: #333;">cloneTyVarTyVar</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2828" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Skol</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">tcHsTyVarBndr</span> <span class="p">(</span><span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span><span class="p">)</span> <span class="n" style="color: #333;">newSkolemTyVar</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2829" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Skol_M</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">tcHsTyVarBndr</span> <span class="p">(</span><span class="n" style="color: #333;">kindLevel</span> <span class="n" style="color: #333;">mode</span><span class="p">)</span> <span class="n" style="color: #333;">newSkolemTyVar</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2830" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">tcHsTyVarBndr</span> <span class="p">(</span><span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span><span class="p">)</span> <span class="n" style="color: #333;">cloneTyVarTyVar</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2831" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Tv_M</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">tcHsTyVarBndr</span> <span class="p">(</span><span class="n" style="color: #333;">kindLevel</span> <span class="n" style="color: #333;">mode</span><span class="p">)</span> <span class="n" style="color: #333;">cloneTyVarTyVar</span><span class="p">)</span></span>
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2832
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<pre style="margin: 0;"> <span id="LC2832" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- newSkolemTyVar: see Note [Non-cloning for tyvar binders]</span></span>
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<pre style="margin: 0;"> <span id="LC2833" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- cloneTyVarTyVar: see Note [Cloning for tyvar binders]</span></span>
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<pre style="margin: 0;"> <span id="LC2834" 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">@@ -2863,13 +2867,13 @@ bindExplicitTKBndrsX tc_tv hs_tvs thing_inside</td>
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<pre style="margin: 0;"> <span id="LC2867" 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;">tv</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2868" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2869" 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="LC2866" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsTyVarBndr</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</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;">TyVar</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2870" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsTyVarBndr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TcTyMode</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</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;">TyVar</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2871" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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;">TcTyVar</span></span>
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<pre style="margin: 0;">-<span id="LC2868" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsTyVarBndr</span> <span class="n" style="color: #333;">new_tv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UserTyVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tv_nm</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC2872" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsTyVarBndr</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;">new_tv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UserTyVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tv_nm</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC2873" 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;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaKindVar</span></span>
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<pre style="margin: 0;"> <span id="LC2874" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_tv</span> <span class="n" style="color: #333;">tv_nm</span> <span class="n" style="color: #333;">kind</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2871" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsTyVarBndr</span> <span class="n" style="color: #333;">new_tv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindedTyVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tv_nm</span><span class="p">)</span> <span class="n" style="color: #333;">lhs_kind</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2872" 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;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left right">LHsKindSig</span></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarBndrKindCtxt</span> <span class="n" style="color: #333;">tv_nm</span><span class="p">)</span> <span class="n" style="color: #333;">lhs_kind</span></span>
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<pre style="margin: 0;">+<span id="LC2875" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsTyVarBndr</span> <span class="n" style="color: #333;"><span class="idiff left">mode</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">new_tv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindedTyVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tv_nm</span><span class="p">)</span> <span class="n" style="color: #333;">lhs_kind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2876" 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;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left">_lhs_kind_sig</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mode</span></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarBndrKindCtxt</span> <span class="n" style="color: #333;">tv_nm</span><span class="p">)</span> <span class="n" style="color: #333;">lhs_kind</span></span>
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<pre style="margin: 0;"> <span id="LC2877" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_tv</span> <span class="n" style="color: #333;">tv_nm</span> <span class="n" style="color: #333;">kind</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2878" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2879" 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">@@ -3322,12 +3326,12 @@ tcHsPartialSigType ctxt sig_ty</td>
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3326
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<pre style="margin: 0;"> <span id="LC3326" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ib_ty</span></span>
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3327
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<pre style="margin: 0;"> <span id="LC3327" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">explicit_hs_tvs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">hs_ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">hs_tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsSigmaTyInvis</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC3328" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addSigCtxt</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC3325" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span></span>
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3329
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<pre style="margin: 0;">+<span id="LC3329" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left right">Hole</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span></span>
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3326
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<pre style="margin: 0;"> <span id="LC3330" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">implicit_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">explicit_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)))</span></span>
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3331
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<pre style="margin: 0;"> <span id="LC3331" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveLocalEqualities</span> <span class="s" style="color: #d14;">"tcHsPartialSigType"</span> <span class="o" style="font-weight: 600;">$</span></span>
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3328
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3332
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<pre style="margin: 0;"> <span id="LC3332" class="line" lang="haskell"> <span class="n" style="color: #333;">tcNamedWildCardBinders</span> <span class="n" style="color: #333;">sig_wcs</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;">wcs</span> <span class="o" style="font-weight: 600;">-></span></span>
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3329
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<pre style="margin: 0;">-<span id="LC3329" class="line" lang="haskell"> <span class="n" style="color: #333;">bindImplicitTKBndrs_Tv</span> <span class="n" style="color: #333;">implicit_hs_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC3330" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Tv</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">explicit_hs_tvs</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC3333" class="line" lang="haskell"> <span class="n" style="color: #333;">bindImplicitTKBndrs_Tv</span> <span class="n" style="color: #333;">implicit_hs_tvs</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC3334" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Tv<span class="idiff left">_M</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mode</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">explicit_hs_tvs</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC3335" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Instantiate the type-class context; but if there</span></span>
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<pre style="margin: 0;"> <span id="LC3336" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is an extra-constraints wildcard, just discard it here</span></span>
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<pre style="margin: 0;"> <span id="LC3337" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcPartialContext</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_ctxt</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">@@ -3457,12 +3461,13 @@ We achieve this as follows:</td>
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<pre style="margin: 0;"> <span id="LC3461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> can't unify with skolem 'a'.</span></span>
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3462
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<pre style="margin: 0;"> <span id="LC3462" class="line" lang="haskell"></span>
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3463
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<pre style="margin: 0;"> <span id="LC3463" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- For /anonymous/ wildcards, such as 'f' above, we carry the ambient</span></span>
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<pre style="margin: 0;">-<span id="LC3460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> level of the signature to the hole in the mode_lvl field of</span></span>
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3461
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<pre style="margin: 0;">-<span id="LC3461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TcTyMode. Then, in tcAnonWildCardOcc we us that level (and /not/</span></span>
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<pre style="margin: 0;">-<span id="LC3462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the level ambient at the occurrence of "_") to create the</span></span>
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3463
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<pre style="margin: 0;">-<span id="LC3463" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unificaiton variable for the wildcard. That is the sole</span></span>
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<pre style="margin: 0;">-<span id="LC3464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> purpose of the mode_lvl field: to transport the ambient level</span></span>
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<pre style="margin: 0;">-<span id="LC3465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of the signature down to the anonymous wildcard occurrences.</span></span>
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3464
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<pre style="margin: 0;">+<span id="LC3464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> level of the signature to the hole in the TcLevel part of the</span></span>
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3465
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<pre style="margin: 0;">+<span id="LC3465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mode_holes field of TcTyMode. Then, in tcAnonWildCardOcc we us that</span></span>
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3466
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<pre style="margin: 0;">+<span id="LC3466" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> level (and /not/ the level ambient at the occurrence of "_") to</span></span>
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3467
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<pre style="margin: 0;">+<span id="LC3467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> create the unification variable for the wildcard. That is the sole</span></span>
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3468
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<pre style="margin: 0;">+<span id="LC3468" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> purpose of the TcLevel in the mode_holes field: to transport the</span></span>
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3469
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<pre style="margin: 0;">+<span id="LC3469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ambient level of the signature down to the anonymous wildcard</span></span>
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3470
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<pre style="margin: 0;">+<span id="LC3470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> occurrences.</span></span>
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3471
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<pre style="margin: 0;"> <span id="LC3471" class="line" lang="haskell"></span>
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3467
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3472
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<pre style="margin: 0;"> <span id="LC3472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Extra-constraint holes in partial type signatures]</span></span>
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3468
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3473
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<pre style="margin: 0;"> <span id="LC3473" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3523,19 +3528,21 @@ tcHsPatSigType :: UserTypeCtxt</td>
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<pre style="margin: 0;"> <span id="LC3528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This may emit constraints</span></span>
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3524
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3529
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<pre style="margin: 0;"> <span id="LC3529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Recipe for checking a signature]</span></span>
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3530
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<pre style="margin: 0;"> <span id="LC3530" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsPatSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig_ty</span></span>
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3526
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<pre style="margin: 0;">-<span id="LC3526" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="p">{</span> <span class="n" style="color: #333;">hswc_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hswc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ib_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig_ty</span></span>
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3527
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<pre style="margin: 0;">-<span id="LC3527" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_ns</span></span>
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3528
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<pre style="margin: 0;">-<span id="LC3528" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ib_ty</span></span>
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3531
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<pre style="margin: 0;">+<span id="LC3531" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="p">{</span> <span class="n" style="color: #333;">hswc_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hswc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ib_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig_ty</span></span>
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3532
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<pre style="margin: 0;">+<span id="LC3532" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_ns</span><span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ib_ty</span></span>
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3529
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3533
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<pre style="margin: 0;"> <span id="LC3533" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addSigCtxt</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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3530
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3534
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<pre style="margin: 0;"> <span id="LC3534" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_tkv_prs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">new_implicit_tv</span> <span class="n" style="color: #333;">sig_ns</span></span>
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3535
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<pre style="margin: 0;">+<span id="LC3535" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkHoleMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span></span>
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3531
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3536
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<pre style="margin: 0;"> <span id="LC3536" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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3532
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<pre style="margin: 0;">-<span id="LC3532" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveLocalEqualities</span> <span class="s" style="color: #d14;">"tcHsPatSigType"</span> <span class="o" style="font-weight: 600;">$</span></span>
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3537
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<pre style="margin: 0;">+<span id="LC3537" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addTypeCtxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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3538
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<pre style="margin: 0;">+<span id="LC3538" class="line" lang="haskell"> <span class="n" style="color: #333;">solveLocalEqualities</span> <span class="s" style="color: #d14;">"tcHsPatSigType"</span> <span class="o" style="font-weight: 600;">$</span></span>
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3533
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3539
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<pre style="margin: 0;"> <span id="LC3539" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Always solve local equalities if possible,</span></span>
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3534
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3540
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<pre style="margin: 0;"> <span id="LC3540" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- else casts get in the way of deep skolemisation</span></span>
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3535
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3541
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<pre style="margin: 0;"> <span id="LC3541" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (#16033)</span></span>
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3536
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3542
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<pre style="margin: 0;"> <span id="LC3542" class="line" lang="haskell"> <span class="n" style="color: #333;">tcNamedWildCardBinders</span> <span class="n" style="color: #333;">sig_wcs</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;">wcs</span> <span class="o" style="font-weight: 600;">-></span></span>
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3537
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3543
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<pre style="margin: 0;"> <span id="LC3543" class="line" lang="haskell"> <span class="n" style="color: #333;">tcExtendNameTyVarEnv</span> <span class="n" style="color: #333;">sig_tkv_prs</span> <span class="o" style="font-weight: 600;">$</span></span>
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3538
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<pre style="margin: 0;">-<span id="LC3538" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsOpenType</span> <span class="n" style="color: #333;">hs_ty</span></span>
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3544
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<pre style="margin: 0;">+<span id="LC3544" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenTypeKind</span></span>
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3545
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<pre style="margin: 0;">+<span id="LC3545" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">ek</span></span>
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3539
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3546
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<pre style="margin: 0;"> <span id="LC3546" 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;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="p">}</span></span>
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3540
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3547
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<pre style="margin: 0;"> <span id="LC3547" class="line" lang="haskell"></span>
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3541
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3548
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<pre style="margin: 0;"> <span id="LC3548" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitNamedWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs</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">@@ -3638,8 +3645,7 @@ It does sort checking and desugaring at the same time, in one single pass.</td>
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3638
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3645
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<pre style="margin: 0;"> <span id="LC3645" class="line" lang="haskell"></span>
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3639
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3646
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<pre style="margin: 0;"> <span id="LC3646" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsKindSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsKind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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;">Kind</span></span>
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3640
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3647
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<pre style="margin: 0;"> <span id="LC3647" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsKindSig</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_kind</span></span>
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3641
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<pre style="margin: 0;">-<span id="LC3641" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkTcTyMode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span></span>
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3642
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<pre style="margin: 0;">-<span id="LC3642" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_lhs_kind_sig</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_kind</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC3648" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_lhs_kind_sig</span> <span class="p">(</span><span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span><span class="p">)</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_kind</span></span>
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3649
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<pre style="margin: 0;"> <span id="LC3649" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3650" class="line" lang="haskell"><span class="n" style="color: #333;">tc_lhs_kind_sig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsKind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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;">Kind</span></span>
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<pre style="margin: 0;"> <span id="LC3651" class="line" lang="haskell"><span class="n" style="color: #333;">tc_lhs_kind_sig</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_kind</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#eade747fa0a15693c67617629e286714fce958e4"><strong>compiler/GHC/Tc/Gen/Sig.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">@@ -376,13 +376,13 @@ tcPatSynSig name sig_ty</td>
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">univ_hs_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">hs_req</span><span class="p">,</span> <span class="n" style="color: #333;">hs_ty1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsSigmaTyInvis</span> <span class="n" style="color: #333;">hs_ty</span></span>
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378
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378
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">ex_hs_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">hs_prov</span><span class="p">,</span> <span class="n" style="color: #333;">hs_body_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsSigmaTyInvis</span> <span class="n" style="color: #333;">hs_ty1</span></span>
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379
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<pre style="margin: 0;">-<span id="LC379" 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="idiff left right"> </span><span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcPatSynSig 1"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC379" 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;">"tcPatSynSig 1"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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380
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">implicit_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">univ_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">ex_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">req</span><span class="p">,</span> <span class="n" style="color: #333;">prov</span><span class="p">,</span> <span class="n" style="color: #333;">body_ty</span><span class="p">))))</span></span>
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381
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushTcLevelM_</span> <span class="o" style="font-weight: 600;">$</span></span>
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382
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"> <span class="n" style="color: #333;">solveEqualities</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [solveEqualities in tcPatSynSig]</span></span>
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383
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<pre style="margin: 0;">-<span id="LC383" class="line" lang="haskell"> <span class="n" style="color: #333;">bindImplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">implicit_hs_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">univ_hs_tvs</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC385" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">ex_hs_tvs</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"> <span class="n" style="color: #333;">bindImplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">implicit_hs_tvs</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">univ_hs_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">ex_hs_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">req</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">hs_req</span></span>
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387
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387
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">prov</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">hs_prov</span></span>
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388
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388
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">body_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsOpenType</span> <span class="n" style="color: #333;">hs_body_ty</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#9ea832ccdb4b5f7508a1efd6caedeafa16b269e7"><strong>compiler/GHC/Tc/Gen/Splice.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">@@ -1430,7 +1430,7 @@ reifyInstances th_nm th_tys</td>
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1430
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1430
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<pre style="margin: 0;"> <span id="LC1430" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushTcLevelM_</span> <span class="o" style="font-weight: 600;">$</span></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="n" style="color: #333;">solveEqualities</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Avoid error cascade if there are unsolved</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;">bindImplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">tv_names</span> <span class="o" style="font-weight: 600;">$</span></span>
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1433
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<pre style="margin: 0;">-<span id="LC1433" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">fst</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="n" style="color: #333;">tcInferLHsType</span> <span class="n" style="color: #333;">rn_ty</span></span>
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1433
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<pre style="margin: 0;">+<span id="LC1433" class="line" lang="haskell"> <span class="n" style="color: #333;">tcInferLHsType</span> <span class="n" style="color: #333;">rn_ty</span></span>
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1434
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1434
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<pre style="margin: 0;"> <span id="LC1434" class="line" lang="haskell"> <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;">zonkTcTypeToType</span> <span class="n" style="color: #333;">ty</span></span>
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1435
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1435
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<pre style="margin: 0;"> <span id="LC1435" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Substitute out the meta type variables</span></span>
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1436
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<pre style="margin: 0;"> <span id="LC1436" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In particular, the type might have kind</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#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">@@ -920,11 +920,11 @@ It is conceivable to do a better job at tracking whether or not a type</td>
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is flattened, but this is left as future work. (Mar '15)</span></span>
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"></span>
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922
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"></span>
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923
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<pre style="margin: 0;">-<span id="LC923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [<span class="idiff left right">FunTy and decomposing tycon applications</span>]</span></span>
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924
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<pre style="margin: 0;">-<span id="LC924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~<span class="idiff left right">~~~~~~~~~~~~~~~~~~~~~~~</span></span></span>
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925
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<pre style="margin: 0;">-<span id="LC925" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">When can_eq_nc' attempts to decompose a tycon application we haven't yet zonked.</span></span></span>
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926
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<pre style="margin: 0;">-<span id="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">This means that we may very well have a FunTy containing a type of some unknown</span></span></span>
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927
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<pre style="margin: 0;">-<span id="LC927" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">kind. For instance, we may have,</span></span>
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [<span class="idiff left right">Decomposing FunTy</span>]</span></span>
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<pre style="margin: 0;">+<span id="LC924" 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="LC925" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">can_eq_nc' may attempt to decompose a FunTy that is un-zonked. This</span></span></span>
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<pre style="margin: 0;">+<span id="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">means that we may very well have a FunTy containing a type of some</span></span></span>
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<pre style="margin: 0;">+<span id="LC927" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">unknown </span>kind. For instance, we may have,</span></span>
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> FunTy (a :: k) Int</span></span>
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<pre style="margin: 0;"> <span id="LC930" 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">@@ -1020,24 +1020,26 @@ can_eq_nc' _flat _rdr_env _envs ev eq_rel ty1@(LitTy l1) _ (LitTy l2) _</td>
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">setEvBindIfWanted</span> <span class="n" style="color: #333;">ev</span> <span class="p">(</span><span class="n" style="color: #333;">evCoercion</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkReflCo</span> <span class="p">(</span><span class="n" style="color: #333;">eqRelRole</span> <span class="n" style="color: #333;">eq_rel</span><span class="p">)</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Equal LitTy"</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1023" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Try to decompose type constructor applications</span></span>
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<pre style="margin: 0;">-<span id="LC1024" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Including FunTy (s -> t)</span></span>
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<pre style="margin: 0;">-<span id="LC1025" class="line" lang="haskell"><span class="n" style="color: #333;">can_eq_nc'</span> <span class="n" style="color: #333;">_flat</span> <span class="n" style="color: #333;">_rdr_env</span> <span class="n" style="color: #333;">_envs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">ty1</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty2</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">-<span id="LC1026" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--- See Note [FunTy and decomposing type constructor applications]</span></span>
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<pre style="margin: 0;">-<span id="LC1027" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">af1</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty1a</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty1b</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ty1</span></span>
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<pre style="margin: 0;">-<span id="LC1028" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">af2</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty2a</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty2b</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC1029" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">af1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">af2</span> <span class="c1" style="color: #998; font-style: italic;">-- Don't decompose (Int -> blah) ~ (Show a => blah)</span></span>
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<pre style="margin: 0;">-<span id="LC1030" 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;">ty1a_rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuntimeRep_maybe</span> <span class="n" style="color: #333;">ty1a</span></span>
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1031
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<pre style="margin: 0;">-<span id="LC1031" 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;">ty1b_rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuntimeRep_maybe</span> <span class="n" style="color: #333;">ty1b</span></span>
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Decompose FunTy: (s -> t) and (c => t)</span></span>
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<pre style="margin: 0;">+<span id="LC1024" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: don't decompose (Int -> blah) ~ (Show a => blah)</span></span>
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1025
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<pre style="margin: 0;">+<span id="LC1025" class="line" lang="haskell"><span class="n" style="color: #333;">can_eq_nc'</span> <span class="n" style="color: #333;">_flat</span> <span class="n" style="color: #333;">_rdr_env</span> <span class="n" style="color: #333;">_envs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1026" 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">
1026
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<pre style="margin: 0;">+<span id="LC1026" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">af1</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty1a</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty1b</span> <span class="p">})</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1027" 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">
1027
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<pre style="margin: 0;">+<span id="LC1027" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">af2</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty2a</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty2b</span> <span class="p">})</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1028" 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">
1028
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">af1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">af2</span> <span class="c1" style="color: #998; font-style: italic;">-- Don't decompose (Int -> blah) ~ (Show a => blah)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1029" 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">
1029
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<pre style="margin: 0;">+<span id="LC1029" 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;">ty1a_rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuntimeRep_maybe</span> <span class="n" style="color: #333;">ty1a</span> <span class="c1" style="color: #998; font-style: italic;">-- getRutimeRep_maybe:</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1030" 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">
1030
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<pre style="margin: 0;">+<span id="LC1030" 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;">ty1b_rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuntimeRep_maybe</span> <span class="n" style="color: #333;">ty1b</span> <span class="c1" style="color: #998; font-style: italic;">-- see Note [Decomposing FunTy]</span></span>
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1032
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1031
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<pre style="margin: 0;"> <span id="LC1031" 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;">ty2a_rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuntimeRep_maybe</span> <span class="n" style="color: #333;">ty2a</span></span>
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1033
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1032
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<pre style="margin: 0;"> <span id="LC1032" 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;">ty2b_rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuntimeRep_maybe</span> <span class="n" style="color: #333;">ty2b</span></span>
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1034
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1033
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canDecomposableTyConAppOK</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">funTyCon</span></span>
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1035
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">ty1a_rep</span><span class="p">,</span> <span class="n" style="color: #333;">ty1b_rep</span><span class="p">,</span> <span class="n" style="color: #333;">ty1a</span><span class="p">,</span> <span class="n" style="color: #333;">ty1b</span><span class="p">]</span></span>
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1036
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">ty2a_rep</span><span class="p">,</span> <span class="n" style="color: #333;">ty2b_rep</span><span class="p">,</span> <span class="n" style="color: #333;">ty2a</span><span class="p">,</span> <span class="n" style="color: #333;">ty2b</span><span class="p">]</span></span>
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1037
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"></span>
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1038
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<pre style="margin: 0;">-<span id="LC1038" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">tys1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ty1</span></span>
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1039
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<pre style="margin: 0;">-<span id="LC1039" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc2</span> <span class="n" style="color: #333;">tys2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ty2</span></span>
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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;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc1</span><span class="p">)</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Decompose type constructor applications</span></span>
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1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: e have expanded type synonyms already</span></span>
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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;">can_eq_nc'</span> <span class="n" style="color: #333;">_flat</span> <span class="n" style="color: #333;">_rdr_env</span> <span class="n" style="color: #333;">_envs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span></span>
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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="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">tys1</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">+<span id="LC1041" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc2</span> <span class="n" style="color: #333;">tys2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">+<span id="LC1042" 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;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc1</span><span class="p">)</span></span>
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canTyConApp</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">tys1</span> <span class="n" style="color: #333;">tc2</span> <span class="n" style="color: #333;">tys2</span></span>
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1045
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<pre style="margin: 0;"> <span id="LC1045" 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">@@ -1505,7 +1507,6 @@ canTyConApp ev eq_rel tc1 tys1 tc2 tys2</td>
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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the wrong thing (from a pretty printing point of view)</span></span>
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1508
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<pre style="margin: 0;"> <span id="LC1508" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for functions, because we've lost the AnonArgFlag; but</span></span>
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1509
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<pre style="margin: 0;"> <span id="LC1509" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in fact we never call canTyConApp on a saturated FunTyCon</span></span>
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<pre style="margin: 0;">-<span id="LC1508" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [FunTy and decomposing type constructor applications]</span></span>
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<pre style="margin: 0;"> <span id="LC1510" class="line" lang="haskell"> <span class="n" style="color: #333;">ty1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">tys1</span></span>
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<pre style="margin: 0;"> <span id="LC1511" class="line" lang="haskell"> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc2</span> <span class="n" style="color: #333;">tys2</span></span>
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<pre style="margin: 0;"> <span id="LC1512" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca"><strong>compiler/GHC/Tc/TyCl.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">@@ -2315,18 +2315,18 @@ newtype instance T [a] :: <kind> where ... -- See Point 5</td>
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<pre style="margin: 0;"> <span id="LC2315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Where these kinds come from: Return kinds are processed through several</span></span>
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<pre style="margin: 0;"> <span id="LC2316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> different code paths:</span></span>
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<pre style="margin: 0;"> <span id="LC2317" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> d</span>ata/newtypes: The return kind is part of the TyCon kind, gotten either</span></span>
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<pre style="margin: 0;">+<span id="LC2318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">D</span>ata/newtypes: The return kind is part of the TyCon kind, gotten either</span></span>
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<pre style="margin: 0;"> <span id="LC2319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by checkInitialKind (standalone kind signature / CUSK) or</span></span>
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<pre style="margin: 0;"> <span id="LC2320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inferInitialKind. It is extracted by bindTyClTyVars in tcTyClDecl1. It is</span></span>
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<pre style="margin: 0;"> <span id="LC2321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then passed to tcDataDefn.</span></span>
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<pre style="margin: 0;"> <span id="LC2322" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> f</span>amilies: The return kind is either written in a standalone signature</span></span>
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<pre style="margin: 0;">+<span id="LC2323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">F</span>amilies: The return kind is either written in a standalone signature</span></span>
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<pre style="margin: 0;"> <span id="LC2324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> or extracted from a family declaration in getInitialKind.</span></span>
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2325
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2325
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<pre style="margin: 0;"> <span id="LC2325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If a family declaration is missing a result kind, it is assumed to be</span></span>
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2326
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2326
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<pre style="margin: 0;"> <span id="LC2326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Type. This assumption is in getInitialKind for CUSKs or</span></span>
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2327
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2327
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<pre style="margin: 0;"> <span id="LC2327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> get_fam_decl_initial_kind for non-signature & non-CUSK cases.</span></span>
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2328
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2328
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<pre style="margin: 0;"> <span id="LC2328" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> i</span>nstances: The data family already has a known kind. The return kind</span></span>
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<pre style="margin: 0;">+<span id="LC2329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">I</span>nstances: The data family already has a known kind. The return kind</span></span>
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2330
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<pre style="margin: 0;"> <span id="LC2330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of an instance is then calculated by applying the data family tycon</span></span>
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<pre style="margin: 0;"> <span id="LC2331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to the patterns provided, as computed by the typeKind lhs_ty in the</span></span>
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2332
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2332
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<pre style="margin: 0;"> <span id="LC2332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> end of tcDataFamInstHeader. In the case of an instance written in GADT</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">@@ -2362,7 +2362,7 @@ newtype instance T [a] :: <kind> where ... -- See Point 5</td>
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2362
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<pre style="margin: 0;"> <span id="LC2362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T5 :: Bool -- bad</span></span>
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2363
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2363
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<pre style="margin: 0;"> <span id="LC2363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T6 :: Type -> Bool -- bad</span></span>
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2364
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<pre style="margin: 0;"> <span id="LC2364" class="line" lang="haskell"></span>
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2365
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<pre style="margin: 0;">-<span id="LC2365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Exactly the same applies to data instance (but not data fam<span class="idiff left right">l</span>ily)</span></span>
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<pre style="margin: 0;">+<span id="LC2365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Exactly the same applies to data instance (but not data family)</span></span>
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2366
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2366
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<pre style="margin: 0;"> <span id="LC2366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> declarations. Examples</span></span>
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<pre style="margin: 0;"> <span id="LC2367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D1 :: Type -- good</span></span>
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<pre style="margin: 0;"> <span id="LC2368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance D2 :: Boool -> Type -- good</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#e63425e031ffe9350ee6b1687e506aaea75d11e1"><strong>compiler/GHC/Tc/TyCl/Instance.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">@@ -852,7 +852,7 @@ tcDataFamInstHeader mb_clsinfo fam_tc imp_vars mb_bndrs fixity</td>
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852
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">isJust</span> <span class="n" style="color: #333;">m_ksig</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"> <span class="n" style="color: #333;">checkDataKindSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataInstanceSort</span> <span class="n" style="color: #333;">new_or_data</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"> <span class="n" style="color: #333;">snd</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcSplitPiTys</span> <span class="n" style="color: #333;">res_kind</span></span>
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<pre style="margin: 0;">-<span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Datatype return kinds], <span class="idiff left right">end of point (4</span>)</span></span>
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Datatype return kinds], <span class="idiff left right">point (4a</span>)</span></span>
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that type patterns match the class instance head</span></span>
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The call to splitTyConApp_maybe here is just an inlining of</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#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">@@ -26,7 +26,7 @@ module GHC.Tc.Types.Constraint (</td>
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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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<pre style="margin: 0;">-<span id="LC29" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</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;">insolubleWC</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">insolubleOrImplicWC</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</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;">insolubleWC</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emptyWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEmptyWC</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isSolvedWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">andWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unionsWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkSimpleWC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkImplicWC</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addInsols</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dropMisleading</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addSimples</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addImplics</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">@@ -934,7 +934,8 @@ addInsols wc cts</td>
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934
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<pre style="margin: 0;"> <span id="LC934" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc_simple</span> <span class="n" style="color: #333;">wc</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">cts</span> <span class="p">}</span></span>
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935
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<pre style="margin: 0;"> <span id="LC935" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC936" class="line" lang="haskell"><span class="n" style="color: #333;">dropMisleading</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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937
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<pre style="margin: 0;">-<span id="LC937" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Drop misleading constraints</span></span>
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Drop misleading constraints; really just class constraints</span></span>
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Constraints and errors] in GHC.Tc.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC939" class="line" lang="haskell"><span class="n" style="color: #333;">dropMisleading</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</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;">implics</span> <span class="p">})</span></span>
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940
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<pre style="margin: 0;"> <span id="LC940" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterBag</span> <span class="n" style="color: #333;">keep_ct</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;"> <span id="LC941" class="line" lang="haskell"> <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;">mapBag</span> <span class="n" style="color: #333;">drop_implic</span> <span class="n" style="color: #333;">implics</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">@@ -943,7 +944,6 @@ dropMisleading (WC { wc_simple = simples, wc_impl = implics })</td>
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<pre style="margin: 0;"> <span id="LC944" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implic</span> <span class="p">{</span> <span class="n" style="color: #333;">ic_wanted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dropMisleading</span> <span class="p">(</span><span class="n" style="color: #333;">ic_wanted</span> <span class="n" style="color: #333;">implic</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC945" class="line" lang="haskell"> <span class="n" style="color: #333;">keep_ct</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC946" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isHoleCt</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isOutOfScopeCt</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">insolubleEqCt</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC947" 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="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">classifyPredType</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 class="kr" style="font-weight: 600;">of</span></span>
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948
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassPred</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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<pre style="margin: 0;"> <span id="LC949" 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;">True</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">@@ -965,17 +965,6 @@ insolubleWC (WC { wc_impl = implics, wc_simple = simples })</td>
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965
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<pre style="margin: 0;"> <span id="LC965" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">anyBag</span> <span class="n" style="color: #333;">insolubleCt</span> <span class="n" style="color: #333;">simples</span></span>
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966
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<pre style="margin: 0;"> <span id="LC966" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">anyBag</span> <span class="n" style="color: #333;">insolubleImplic</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;"> <span id="LC967" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC968" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleOrImplicWC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</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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969
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<pre style="margin: 0;">-<span id="LC969" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Any insoluble simple constraints, or any (non-empty) implications</span></span>
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<pre style="margin: 0;">-<span id="LC970" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The latter are almost certainly skolem-escape violations</span></span>
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971
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<pre style="margin: 0;">-<span id="LC971" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleOrImplicWC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</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;">implics</span><span class="p">,</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">anyBag</span> <span class="n" style="color: #333;">insolubleCt</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;">-<span id="LC973" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">non_empty_implics</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;">-<span id="LC974" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC975" class="line" lang="haskell"> <span class="n" style="color: #333;">non_empty_implics</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">anyBag</span> <span class="p">(</span><span class="n" style="color: #333;">non_empty_wc</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ic_wanted</span><span class="p">)</span></span>
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976
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<pre style="margin: 0;">-<span id="LC976" class="line" lang="haskell"> <span class="n" style="color: #333;">non_empty_wc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</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;">implics</span><span class="p">,</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC977" 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;">isEmptyBag</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">non_empty_implics</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;">-<span id="LC978" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC968" class="line" lang="haskell"><span class="n" style="color: #333;">insolubleCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC969" 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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<pre style="margin: 0;"> <span id="LC970" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Namely: a) an equality constraint</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#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">@@ -125,7 +125,7 @@ data UserTypeCtxt</td>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunSigCtxt</span> <span class="n" style="color: #333;">n</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;">text</span> <span class="s" style="color: #d14;">"the type signature for"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InfSigCtxt</span> <span class="n" style="color: #333;">n</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;">"the inferred type for"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC128" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleSigCtxt</span> <span class="n" style="color: #333;">n</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;">"<span class="idiff left right">a RULE</span> for"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleSigCtxt</span> <span class="n" style="color: #333;">n</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;">"<span class="idiff left right">the type signature</span> for"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"an expression type signature"</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">KindSigCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a kind signature"</span></span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSigCtxt</span> <span class="n" style="color: #333;">n</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;">"a standalone kind signature for"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590"><strong>compiler/GHC/Tc/Utils/TcType.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">@@ -429,11 +429,12 @@ mkSynFunTys arg_tys res_ty = foldr SynFun (SynType res_ty) arg_tys</td>
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<pre style="margin: 0;"> <span id="LC429" 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="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [TcRhoType]</span></span>
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<pre style="margin: 0;"> <span id="LC431" 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="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A TcRhoType has no foralls or contexts at the top, or to the right of an arrow</span></span>
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<pre style="margin: 0;">-<span id="LC433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> YES (forall a. a->a) -> Int</span></span>
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<pre style="margin: 0;">+<span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A TcRhoType has no foralls or contexts at the top</span></span>
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NO forall a. a -> Int</span></span>
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<pre style="margin: 0;"> <span id="LC434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NO Eq a => a -> a</span></span>
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<pre style="margin: 0;">-<span id="LC436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NO Int -> forall a. a -> Int</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> YES a -> a</span></span>
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<pre style="margin: 0;">+<span id="LC436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> YES (forall a. a->a) -> Int</span></span>
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<pre style="margin: 0;">+<span id="LC437" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> YES Int -> forall a. a -> Int</span></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.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">@@ -13,8 +13,9 @@</td>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="cd">-- | Type subsumption and unification</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Full-blown subsumption</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcWrapResult</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcWrapResultO</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemise</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemiseET</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSubType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSubTypeSigma</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSubTypePat</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSubTypeHR</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcWrapResult</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcWrapResultO</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcWrapResultMono</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemise</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemiseET</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;">tcSubType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSubTypeSigma</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSubTypePat</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;">checkConstraints</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkTvConstraints</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">buildImplicationFor</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">buildTvImplication</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emitResidualTvConstraint</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC21" 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">@@ -30,7 +31,7 @@ module GHC.Tc.Utils.Unify (</td>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchExpectedTyConApp</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchExpectedAppTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchExpectedFunTys</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchActualFunTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">matchActualFunTy<span class="idiff left right">sPart</span></span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchActualFunTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">matchActualFunTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchExpectedFunKind</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">metaTyVarUpdateOK</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">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>
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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">@@ -216,7 +217,7 @@ matchExpectedFunTys herald ctx arity orig_ty thing_inside</td>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">more_arg_tys</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">more_arg_tys</span></span>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">unif_fun_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="n" style="color: #333;">more_arg_tys</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubType</span> <span class="kt" style="color: #458; font-weight: 600;">AppOrigin</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">GenSigCtxt</span></span> <span class="n" style="color: #333;">unif_fun_ty</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubType</span> <span class="kt" style="color: #458; font-weight: 600;">AppOrigin</span> <span class="n" style="color: #333;"><span class="idiff left right">ctx</span></span> <span class="n" style="color: #333;">unif_fun_ty</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Not a good origin at all :-(</span></span>
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<pre style="margin: 0;"> <span id="LC222" 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;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC223" 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">@@ -237,31 +238,45 @@ matchActualFunTys :: SDoc -- See Note [Herald for matchExpectedFunTys]</td>
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<pre style="margin: 0;"> <span id="LC238" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- the thing with type TcSigmaType</span></span>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span></span>
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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC241" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If matchActualFunTys n ty = (wrap, [t1,..,tn], ty_r)</span></span>
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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- then wrap : ty ~> (t1 -> ... -> tn -> ty_r)</span></span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If matchActualFunTys n ty = (wrap, [t1,..,tn], res_ty)</span></span>
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<pre style="margin: 0;">+<span id="LC243" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- then wrap : ty ~> (t1 -> ... -> tn -> res_ty)</span></span>
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and res_ty is a RhoType</span></span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTys</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">mb_thing</span> <span class="n" style="color: #333;">n_val_args_wanted</span> <span class="n" style="color: #333;">fun_ty</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;">matchActualFunTysPart</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">mb_thing</span></span>
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<pre style="margin: 0;">-<span id="LC245" class="line" lang="haskell"> <span class="n" style="color: #333;">n_val_args_wanted</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC246" class="line" lang="haskell"> <span class="n" style="color: #333;">n_val_args_wanted</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC246" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n_val_args_wanted</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">fun_ty</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;">go</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">fun_ty</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="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topInstantiate</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC250" 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;">wrap</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC251" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">so_far</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC252" 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;">wrap_fun1</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty1</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTy</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">mb_thing</span></span>
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">n_val_args_wanted</span><span class="p">,</span> <span class="n" style="color: #333;">so_far</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_res</span><span class="p">,</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">arg_ty1</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">so_far</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty1</span></span>
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256
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">wrap_fun2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWpFun</span> <span class="n" style="color: #333;">idHsWrapper</span> <span class="n" style="color: #333;">wrap_res</span> <span class="n" style="color: #333;">arg_ty1</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">doc</span></span>
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257
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<pre style="margin: 0;">+<span id="LC257" 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;">wrap_fun2</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">wrap_fun1</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty1</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>
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258
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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259
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="haskell"> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"When inferring the argument type of a function with type"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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260
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="haskell"> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fun_ty</span><span class="p">)</span></span>
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247
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261
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC262" class="line" lang="haskell"><span class="cd">-- | Variant of 'matchActualFunTys' that works when supplied only part</span></span>
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263
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<pre style="margin: 0;"> <span id="LC263" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (that is, to the right of some arrows) of the full function type</span></span>
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<pre style="margin: 0;">-<span id="LC250" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTy<span class="idiff left right">sPart</span></span></span>
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTy</span></span>
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Herald for matchExpectedFunTys]</span></span>
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252
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span></span>
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253
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<pre style="margin: 0;">-<span id="LC253" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- The thing with type TcSigmaType</span></span>
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254
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<pre style="margin: 0;">-<span id="LC254" 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">Arity</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Total number of value args in the call</span></span></span>
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255
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<pre style="margin: 0;">-<span id="LC255" class="line" lang="haskell"> <span class="o" 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">TcSigmaType</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- T</span>ypes of values args to which function has</span></span>
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256
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<pre style="margin: 0;">-<span id="LC256" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- been applied already (reversed)</span></span>
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257
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<pre style="margin: 0;">-<span id="LC257" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Arity</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Number of new value args wanted</span></span></span>
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267
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<pre style="margin: 0;">+<span id="LC267" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- The thing with type TcSigmaType</span></span>
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268
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"> <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">Arity</span></span><span class="p"><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">TcSigmaType</span></span><span class="p"><span class="idiff">])</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Total number of value args in the call, and</span></span></span>
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269
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- t</span>ypes of values args to which function has</span></span>
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270
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- been applied already (reversed)</span></span>
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271
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Both are used only for error messages)</span></span></span>
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258
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272
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="c1" style="color: #998; font-style: italic;">-- Type to analyse</span></span>
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259
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="p"><span class="idiff left">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcSigmaType</span></span><span class="p"><span class="idiff right">]</span>,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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273
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TcSigmaType</span></span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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260
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274
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [matchActualFunTys error handling] for all these arguments</span></span>
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261
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<pre style="margin: 0;">-<span id="LC261" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTysPart</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">mb_thing</span></span>
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262
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<pre style="margin: 0;">-<span id="LC262" class="line" lang="haskell"> <span class="n" style="color: #333;">n_val_args_in_call</span> <span class="n" style="color: #333;">arg_tys_so_far</span></span>
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263
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"> <span class="n" style="color: #333;">n_val_args_wanted</span> <span class="n" style="color: #333;">fun_ty</span></span>
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264
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<pre style="margin: 0;">-<span id="LC264" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n_val_args_wanted</span> <span class="n" style="color: #333;">arg_tys_so_far</span> <span class="n" style="color: #333;">fun_ty</span></span>
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275
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If (wrap, arg_ty, res_ty) = matchActualFunTy ... fun_ty</span></span>
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276
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- then wrap :: fun_ty ~> (arg_ty -> res_ty)</span></span>
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277
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and NB: res_ty is an (uninstantiated) SigmaType</span></span>
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278
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTy</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">mb_thing</span> <span class="n" style="color: #333;">err_info</span> <span class="n" style="color: #333;">fun_ty</span></span>
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279
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">fun_ty</span></span>
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265
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280
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does not allocate unnecessary meta variables: if the input already is</span></span>
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266
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281
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<pre style="margin: 0;"> <span id="LC281" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a function, we just take it apart. Not only is this efficient,</span></span>
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267
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282
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- it's important for higher rank: the argument might be of form</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">@@ -288,40 +303,28 @@ matchActualFunTysPart herald ct_orig mb_thing</td>
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bizarre to build the HsWrapper but not the arg_tys.</span></span>
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289
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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290
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305
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Refactoring is welcome.</span></span>
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291
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;">-<span id="LC292" 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;">TcSigmaType</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Types of value args to which the function has</span></span>
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293
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<pre style="margin: 0;">-<span id="LC293" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- been applied so far (reversed)</span></span>
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<pre style="margin: 0;">-<span id="LC294" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Used only for error messages</span></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="c1" style="color: #998; font-style: italic;">-- the remainder of the type as we're processing</span></span>
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC297" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">idHsWrapper</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC298" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC299" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">so_far</span> <span class="n" style="color: #333;">ty</span></span>
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300
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<pre style="margin: 0;">-<span id="LC300" 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;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcView</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">so_far</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;">-<span id="LC301" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC302" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">so_far</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="c1" style="color: #998; font-style: italic;">-- the remainder of the type as we're processing</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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308
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</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;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcView</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC311" 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;">null</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">theta</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC312" 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;">wrap1</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topInstantiate</span> <span class="n" style="color: #333;">ct_orig</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC305" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap2</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty<span class="idiff left">s</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">res_ty</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">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">so_far</span></span> <span class="n" style="color: #333;">rho</span></span>
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<pre style="margin: 0;">-<span id="LC306" 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;">wrap2</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">wrap1</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty<span class="idiff left right">s</span></span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap2</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">res_ty</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">go</span></span> <span class="n" style="color: #333;">rho</span></span>
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<pre style="margin: 0;">+<span id="LC314" 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;">wrap2</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">wrap1</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC316" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</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;">tcSplitSigmaTy</span> <span class="n" style="color: #333;">ty</span></span>
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317
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<pre style="margin: 0;"> <span id="LC317" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC310" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">so_far</span></span><span class="idiff right"> </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">af</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC318" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">af</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC319" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">af</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">VisArg</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC312" 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;">wrap_res</span><span class="p">,</span> <span class="n" style="color: #333;">tys</span><span class="p">,</span> <span class="n" style="color: #333;">ty_r</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">arg_ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">so_far</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC313" 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;">mkWpFun</span> <span class="n" style="color: #333;">idHsWrapper</span> <span class="n" style="color: #333;">wrap_res</span> <span class="n" style="color: #333;">arg_ty</span> <span class="n" style="color: #333;">ty_r</span> <span class="n" style="color: #333;">doc</span></span>
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<pre style="margin: 0;">-<span id="LC314" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">tys</span><span class="p">,</span> <span class="n" style="color: #333;">ty_r</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC315" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC316" class="line" lang="haskell"> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"When inferring the argument type of a function with type"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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<pre style="margin: 0;">-<span id="LC317" class="line" lang="haskell"> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fun_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">idHsWrapper</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC321" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">so_far</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isMetaTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;"> <span id="LC324" 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;">cts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readMetaTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cts</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC323" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Indirect</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">so_far</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Flexi</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">defer</span> <span class="n" style="color: #333;"><span class="idiff left">n</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Indirect</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Flexi</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">defer</span> <span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC329" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In all other cases we bale out into ordinary unification</span></span>
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- However unlike the meta-tyvar case, we are sure that the</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">@@ -338,22 +341,23 @@ matchActualFunTysPart herald ct_orig mb_thing</td>
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<pre style="margin: 0;"> <span id="LC341" 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="LC342" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- But in that case we add specialized type into error context</span></span>
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<pre style="margin: 0;"> <span id="LC343" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- anyway, because it may be useful. See also #9605.</span></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">so_far</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</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">addErrCtxtM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mk_ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">so_far</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</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">defer</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">n</span></span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left">ty</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">addErrCtxtM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mk_ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</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">defer</span></span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC345" class="line" lang="haskell"></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;">------------</span></span>
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<pre style="margin: 0;">-<span id="LC344" class="line" lang="haskell"> <span class="n" style="color: #333;">defer</span> <span class="n" style="color: #333;"><span class="idiff left">n</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">-<span id="LC345" 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;">arg_ty<span class="idiff left">s</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">replicateM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">n</span></span> <span class="n" style="color: #333;">newOpenFlexiTyVarTy</span></span>
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<pre style="margin: 0;">-<span id="LC346" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenFlexiTyVarTy</span></span>
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">unif_fun_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTy<span class="idiff left">s</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arg_tys</span></span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"> <span class="n" style="color: #333;">defer</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">+<span id="LC348" 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;">arg_ty</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff right"><-</span></span> <span class="n" style="color: #333;">newOpenFlexiTyVarTy</span></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenFlexiTyVarTy</span></span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">unif_fun_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTy</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">arg_ty</span></span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyType</span> <span class="n" style="color: #333;">mb_thing</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">unif_fun_ty</span></span>
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<pre style="margin: 0;">-<span id="LC349" 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;">mkWpCastN</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty<span class="idiff left right">s</span></span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC352" 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;">mkWpCastN</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC354" 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="LC352" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_ctxt</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">TcType</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;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MsgDoc</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_ctxt</span> <span class="n" style="color: #333;"><span class="idiff left">arg_tys</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_ctxt</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;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MsgDoc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_ctxt</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;"> <span id="LC357" 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;">env'</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTidyTcType</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">arg_tys<span class="idiff left right">_so_far</span></span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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356
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<pre style="margin: 0;"> <span id="LC359" 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;">env'</span><span class="p">,</span> <span class="n" style="color: #333;">mk_fun_tys_msg</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">n_val_args_in_call</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">n_val_args_in_call</span><span class="p">,</span> <span class="n" style="color: #333;">arg_tys_so_far</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">err_info</span></span>
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357
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361
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"><span class="n" style="color: #333;">mk_fun_tys_msg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</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;">Arity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"><span class="n" style="color: #333;">mk_fun_tys_msg</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">n_args_in_call</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">@@ -510,6 +514,35 @@ expected_ty.</td>
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<pre style="margin: 0;"> <span id="LC514" 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="LC515" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC516" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC517" 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="LC518" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tcWrapResult needs both un-type-checked (for origins and error messages)</span></span>
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<pre style="margin: 0;">+<span id="LC519" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and type-checked (for wrapping) expressions</span></span>
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"><span class="n" style="color: #333;">tcWrapResult</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"><span class="n" style="color: #333;">tcWrapResult</span> <span class="n" style="color: #333;">rn_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcWrapResultO</span> <span class="p">(</span><span class="n" style="color: #333;">exprCtOrigin</span> <span class="n" style="color: #333;">rn_expr</span><span class="p">)</span> <span class="n" style="color: #333;">rn_expr</span></span>
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"><span class="n" style="color: #333;">tcWrapResultO</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;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span></span>
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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC526" class="line" lang="haskell"><span class="n" style="color: #333;">tcWrapResultO</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">rn_expr</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">actual_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC527" 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;">"tcWrapResult"</span> <span class="p">(</span><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;">"Actual: "</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">actual_ty</span></span>
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Expected:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">])</span></span>
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529
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubTypeNC</span> <span class="n" style="color: #333;">orig</span> <span class="kt" style="color: #458; font-weight: 600;">GenSigCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rn_expr</span><span class="p">)</span> <span class="n" style="color: #333;">actual_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC530" 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;">mkHsWrap</span> <span class="n" style="color: #333;">wrap</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="p">}</span></span>
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531
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"><span class="n" style="color: #333;">tcWrapResultMono</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span></span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span> <span class="c1" style="color: #998; font-style: italic;">-- Actual -- a rho-type not a sigma-type</span></span>
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534
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span> <span class="c1" style="color: #998; font-style: italic;">-- Expected</span></span>
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- A version of tcWrapResult to use when the actual type is a</span></span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- rho-type, so nothing to instantiate; just go straight to unify.</span></span>
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<pre style="margin: 0;">+<span id="LC538" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It means we don't need to pass in a CtOrigin</span></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"><span class="n" style="color: #333;">tcWrapResultMono</span> <span class="n" style="color: #333;">rn_expr</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">act_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">isRhoTy</span> <span class="n" style="color: #333;">act_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">act_ty</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rn_expr</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">res_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Infer</span> <span class="n" style="color: #333;">inf_res</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">fillInferResult</span> <span class="n" style="color: #333;">act_ty</span> <span class="n" style="color: #333;">inf_res</span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Check</span> <span class="n" style="color: #333;">exp_ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unifyType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rn_expr</span><span class="p">)</span> <span class="n" style="color: #333;">act_ty</span> <span class="n" style="color: #333;">exp_ty</span></span>
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<pre style="margin: 0;">+<span id="LC544" 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;">mkHsWrapCo</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC545" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC546" 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="LC547" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubTypePat</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;">UserTypeCtxt</span></span>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</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;">HsWrapper</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">@@ -527,17 +560,16 @@ tcSubTypePat _ _ (Infer inf_res) ty_expected</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;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpCastN</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcSymCo</span> <span class="n" style="color: #333;">co</span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC562" 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="LC530" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubType</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;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</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;">HsWrapper</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubType</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;">UserTypeCtxt</span></span>
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="c1" style="color: #998; font-style: italic;">-- Actual</span></span>
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span> <span class="c1" style="color: #998; font-style: italic;">-- Expected</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="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span></span>
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Checks that 'actual' is more polymorphic than 'expected'</span></span>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubType</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ty_actual</span> <span class="n" style="color: #333;">ty_expected</span></span>
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addSubTypeCtxt</span> <span class="n" style="color: #333;">ty_actual</span> <span class="n" style="color: #333;">ty_expected</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"> <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;">"tcSubType"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty_actual</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty_expected</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcSubTypeNC</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">ty_actual</span> <span class="n" style="color: #333;">ty_expected</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC536" class="line" lang="haskell"><span class="cd">-- | Call this variant when you are in a higher-rank situation</span></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubTypeHR</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;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</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;">HsWrapper</span></span>
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<pre style="margin: 0;">-<span id="LC538" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubTypeHR</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSubTypeNC</span> <span class="n" style="color: #333;">orig</span> <span class="kt" style="color: #458; font-weight: 600;">GenSigCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC540" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubTypeNC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="c1" style="color: #998; font-style: italic;">-- origin used for instantiation only</span></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="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</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="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- The expression that has type 'actual' (if known)</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">@@ -699,24 +731,6 @@ to a UserTypeCtxt of GenSigCtxt. Why?</td>
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [When to build an implication]</span></span>
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<pre style="margin: 0;"> <span id="LC732" 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="LC733" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC702" 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="LC703" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- needs both un-type-checked (for origins) and type-checked (for wrapping)</span></span>
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<pre style="margin: 0;">-<span id="LC704" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- expressions</span></span>
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<pre style="margin: 0;">-<span id="LC705" class="line" lang="haskell"><span class="n" style="color: #333;">tcWrapResult</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span></span>
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<pre style="margin: 0;">-<span id="LC706" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC707" class="line" lang="haskell"><span class="n" style="color: #333;">tcWrapResult</span> <span class="n" style="color: #333;">rn_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcWrapResultO</span> <span class="p">(</span><span class="n" style="color: #333;">exprCtOrigin</span> <span class="n" style="color: #333;">rn_expr</span><span class="p">)</span> <span class="n" style="color: #333;">rn_expr</span></span>
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<pre style="margin: 0;">-<span id="LC708" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="haskell"><span class="cd">-- | Sometimes we don't have a @HsExpr Name@ to hand, and this is more</span></span>
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<pre style="margin: 0;">-<span id="LC710" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- convenient.</span></span>
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<pre style="margin: 0;">-<span id="LC711" class="line" lang="haskell"><span class="n" style="color: #333;">tcWrapResultO</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;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span></span>
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<pre style="margin: 0;">-<span id="LC712" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC713" class="line" lang="haskell"><span class="n" style="color: #333;">tcWrapResultO</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">rn_expr</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">actual_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC714" 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;">"tcWrapResult"</span> <span class="p">(</span><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;">"Actual: "</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">actual_ty</span></span>
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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;">text</span> <span class="s" style="color: #d14;">"Expected:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res_ty</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="n" style="color: #333;">cow</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubTypeNC</span> <span class="n" style="color: #333;">orig</span> <span class="kt" style="color: #458; font-weight: 600;">GenSigCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rn_expr</span><span class="p">)</span></span>
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717
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<pre style="margin: 0;">-<span id="LC717" class="line" lang="haskell"> <span class="n" style="color: #333;">actual_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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718
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<pre style="margin: 0;">-<span id="LC718" 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;">mkHsWrap</span> <span class="n" style="color: #333;">cow</span> <span class="n" style="color: #333;">expr</span><span class="p">)</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>
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720
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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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721
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735
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<pre style="margin: 0;"> <span id="LC735" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- **********************************************************************</span></span>
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736
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<pre style="margin: 0;"> <span id="LC736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%* *</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1550,7 +1564,7 @@ uUnfilledVar2 origin t_or_k swapped tv1 ty2</td>
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1550
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1564
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<pre style="margin: 0;"> <span id="LC1564" class="line" lang="haskell"></span>
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1551
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<pre style="margin: 0;"> <span id="LC1565" class="line" lang="haskell"><span class="n" style="color: #333;">swapOverTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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;">TcTyVar</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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1552
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1566
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<pre style="margin: 0;"> <span id="LC1566" class="line" lang="haskell"><span class="n" style="color: #333;">swapOverTyVars</span> <span class="n" style="color: #333;">is_given</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">tv2</span></span>
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1553
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<pre style="margin: 0;">-<span id="LC1553" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Get u</span>nification variables on the left]</span></span>
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<pre style="margin: 0;">+<span id="LC1567" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">U</span>nification variables on the left]</span></span>
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1554
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1568
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<pre style="margin: 0;"> <span id="LC1568" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">is_given</span><span class="p">,</span> <span class="n" style="color: #333;">pri1</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">pri2</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</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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1555
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1569
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<pre style="margin: 0;"> <span id="LC1569" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">is_given</span><span class="p">,</span> <span class="n" style="color: #333;">pri2</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">pri1</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</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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1570
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<pre style="margin: 0;"> <span id="LC1570" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#bda6fd73ee46adb428d2f370a800d75d8870285b"><strong>testsuite/tests/dependent/should_fail/T16326_Fail10.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">@@ -3,5 +3,5 @@ T16326_Fail10.hs:12:18: error:</td>
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3
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3
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Illegal visible, dependent quantification in the type of a term:</span>
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4
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4
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> forall a -> a -> a</span>
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5
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5
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> (GHC does not yet support this)</span>
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6
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> • In <span class="idiff left right">a RULE</span> for ‘x’: forall a -> a -> a</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In <span class="idiff left right">the type signature</span> for ‘x’: forall a -> a -> a</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> When checking the transformation rule "flurmp"</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#d8ffdc8dc2a88f5597df2257cd4ca89f8390d870"><strong>testsuite/tests/typecheck/should_compile/T10072.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">@@ -6,5 +6,5 @@ T10072.hs:3:31: error:</td>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> at T10072.hs:3:1-47</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> To use the inferred type, enable PartialTypeSignatures</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> • In the type ‘a -> _’</span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext"> In <span class="idiff left right">a RULE</span> for ‘f’: a -> _</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> In <span class="idiff left right">the type signature</span> for ‘f’: a -> _</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> When checking the transformation rule "map/empty"</span></pre>
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<li id="7c46d0abb66fb7b4cc49c32adff78c4ec7f64517">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c73bb2ecfa4aec49a915777adc698bc8839e9e71#7c46d0abb66fb7b4cc49c32adff78c4ec7f64517"><strong>testsuite/tests/typecheck/should_fail/tcfail206.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">@@ -17,7 +17,7 @@ tcfail206.hs:8:5: error:</td>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">tcfail206.hs:11:5: error:</span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext"> • Couldn't match type ‘a’ with ‘Bool’</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"> Expected: a -> (a, Bool)</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext"> Actual: a -> (<span class="idiff left right">a</span>, a)</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> Actual: a -> (<span class="idiff left right">Bool</span>, a)</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"> ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"> c :: forall a. a -> (a, Bool)</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">@@ -45,7 +45,7 @@ tcfail206.hs:17:5: error:</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">tcfail206.hs:20:5: error:</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"> • Couldn't match type ‘a’ with ‘Bool’</span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext"> Expected: a -> (# a, Bool #)</span>
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<pre style="margin: 0;">-<span id="LC48" class="line" lang="plaintext"> Actual: a -> (# <span class="idiff left right">a</span>, a #)</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext"> Actual: a -> (# <span class="idiff left right">Bool</span>, a #)</span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext"> ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext"> f :: forall a. a -> (# a, Bool #)</span>
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