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<h3>
Simon Peyton Jones pushed to branch wip/T18126-deep
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/372da668e8a570f4ffb0020adb67e8c9fbf3d728">372da668</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-06-01T23:20:19+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improving error messages
</pre>
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</ul>
<h4>28 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#446cb12ca6cefaf1c6eb79b7db643632744263c7">
compiler/GHC/Parser/PostProcess.hs
</a>
</li>
<li class="file-stats">
<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
compiler/GHC/Tc/Errors.hs
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<li class="file-stats">
<a href="#6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
compiler/GHC/Tc/Gen/App.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="#3ee8be814b6c6727880deab3772e6af922524bf0">
compiler/GHC/Tc/Gen/Pat.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="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<li class="file-stats">
<a href="#3579790a89a1f3d4cd2c621037453b23ed04a87b">
compiler/GHC/Tc/Utils/Unify.hs-boot
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<li class="file-stats">
<a href="#6a120b0673f8920127d8fffdaa16f01b90cc92d7">
compiler/GHC/Tc/Utils/Zonk.hs
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<li class="file-stats">
<a href="#742581bc447da42bbc346f7d2529e6aa9c77f20c">
testsuite/tests/impredicative/T18126-nasty.hs
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<li class="file-stats">
<a href="#c41ecb9c589d5a88e103cc93ddcc3f4255442d00">
testsuite/tests/indexed-types/should_fail/T4485.stderr
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</li>
<li class="file-stats">
<a href="#22b4051faa20447752f5080f6f120fbeba6602b8">
testsuite/tests/typecheck/should_compile/T13050.hs
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</li>
<li class="file-stats">
<a href="#ef045b7d39e671fe4c034f0234f8e3b210dae601">
testsuite/tests/typecheck/should_compile/T5490.hs
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</li>
<li class="file-stats">
<a href="#ab28f67deb9ac491af24c0fde6ee70d7b8c486db">
testsuite/tests/typecheck/should_fail/T15862.stderr
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<li class="file-stats">
<a href="#5fab07a05f110bd2cd1c62c975ecc29a366fd073">
testsuite/tests/typecheck/should_fail/T2846b.hs
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<li class="file-stats">
<a href="#05b60e08254352118b4d1fd7604362a8a77cbb82">
testsuite/tests/typecheck/should_fail/T2846b.stderr
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<li class="file-stats">
<a href="#0158b6615005db39bac2e708ca62ed4a319172de">
testsuite/tests/typecheck/should_fail/T3176.stderr
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<li class="file-stats">
<a href="#99e9e3cbf5225d3b49621941bc28b97e6a5d32f8">
testsuite/tests/typecheck/should_fail/T6069.stderr
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<li class="file-stats">
<a href="#b166026a124e4ed0cfeb367ad0745c803ab612ff">
testsuite/tests/typecheck/should_fail/T8450.stderr
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<li class="file-stats">
<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">
testsuite/tests/typecheck/should_fail/all.T
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<li class="file-stats">
<a href="#5897532a78b47edda1ef047493c310fa56ca8570">
testsuite/tests/typecheck/should_fail/tcfail140.stderr
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<li class="file-stats">
<a href="#6544261c560cd0344b7a1682b390319089d5b1cb">
testsuite/tests/typecheck/should_fail/tcfail204.stderr
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<li class="file-stats">
<a href="#d3c776c0838cc9e459391d94fa49bcde6ad39746">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/too-many.hs
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<li class="file-stats">
<a href="#a2cde8b4b5d8e1886ae210726860690c3d8e455e">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/too-many.stderr
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<li class="file-stats">
<a href="#6315bb4bbd562a7f525adef27453d8214232a689">
testsuite/tests/warnings/should_compile/PluralS.stderr
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</li>
</ul>
<h4>Changes:</h4>
<li id="cc97d81e7223ad4a3a5e801156ca632f9fa75654">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#cc97d81e7223ad4a3a5e801156ca632f9fa75654"><strong>compiler/GHC/Hs/Expr.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="39" 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">@@ -39,6 +39,7 @@ import GHC.Hs.Binds</td>
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<td class="diff-line-num old_line" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- others:</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span></span>
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<td class="diff-line-num old_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</span></span>
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<td class="diff-line-num new old_line" data-linenumber="42" 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="42" 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="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="p">)</span></span>
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<td class="diff-line-num new_line" data-linenumber="43" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Set</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="591" 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="592" 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">@@ -591,7 +592,6 @@ deriving instance (Data (hs_syn GhcTc), Typeable hs_syn) => Data (HsWrap hs_syn)</td>
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<td class="diff-line-num old_line" data-linenumber="591" 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">
591
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<td class="diff-line-num new_line" data-linenumber="592" 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">
592
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<pre style="margin: 0;"> <span id="LC592" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ---------------------------------------------------------------------</span></span>
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592
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<td class="diff-line-num new_line" data-linenumber="593" 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">
593
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<pre style="margin: 0;"> <span id="LC593" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="593" 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">
593
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<td class="diff-line-num new_line" data-linenumber="594" 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">
594
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<pre style="margin: 0;"> <span id="LC594" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XVar</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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<td class="diff-line-num old old_line" data-linenumber="594" 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">
594
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<td class="diff-line-num new_line old" data-linenumber="595" 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="LC594" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XUnboundVar</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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<td class="diff-line-num old_line" data-linenumber="595" 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">
595
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<td class="diff-line-num new_line" data-linenumber="595" 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">
595
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<pre style="margin: 0;"> <span id="LC595" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XConLikeOut</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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<td class="diff-line-num old_line" data-linenumber="596" 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">
596
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<td class="diff-line-num new_line" data-linenumber="596" 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">
596
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<pre style="margin: 0;"> <span id="LC596" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XRecFld</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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597
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597
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<pre style="margin: 0;"> <span id="LC597" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XOverLabel</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</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">@@ -602,6 +602,10 @@ type instance XLam (GhcPass _) = NoExtField</td>
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602
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602
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XLamCase</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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603
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603
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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604
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604
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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XUnboundVar</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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606
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XUnboundVar</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;">NoExtField</span></span>
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XUnboundVar</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span></span>
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608
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"></span>
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609
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XAppTypeE</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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610
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<pre style="margin: 0;"> <span id="LC610" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XAppTypeE</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;">NoExtField</span></span>
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611
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XAppTypeE</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1236,7 +1240,6 @@ isAtomicHsExpr (HsOverLit {}) = True</td>
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1236
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1240
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<pre style="margin: 0;"> <span id="LC1240" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicHsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIPVar</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1237
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1241
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<pre style="margin: 0;"> <span id="LC1241" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicHsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsOverLabel</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1238
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1242
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<pre style="margin: 0;"> <span id="LC1242" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicHsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsUnboundVar</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1239
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<pre style="margin: 0;">-<span id="LC1239" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicHsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsPar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isAtomicHsExpr</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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1240
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1243
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<pre style="margin: 0;"> <span id="LC1243" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicHsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1241
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1244
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<pre style="margin: 0;"> <span id="LC1244" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicHsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XExpr</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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1242
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1245
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<pre style="margin: 0;"> <span id="LC1245" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ghcPass</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">p</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#6bdd5abc649727f2a802bc96ce5c276de19d3726"><strong>compiler/GHC/HsToCore/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">@@ -260,8 +260,8 @@ dsLExprNoLP (L loc e)</td>
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</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;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</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;">dsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsPar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">e</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;">dsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprWithTySig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</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;">dsLExpr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</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;"><span class="idiff left">var</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">dsHsVar</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">var</span></span></span>
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264
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<pre style="margin: 0;">-<span id="LC264" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsUnboundVar</span> <span class="p"><span class="idiff left">{})</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">panic</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"dsExpr: HsUnboundVar"</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Typechecker eliminates them</span></span></span>
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</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;"><span class="idiff left">id</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">dsHsVar</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">id</span></span></span>
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsUnboundVar</span> <span class="n" style="color: #333;"><span class="idiff left">id</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</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">dsHsVar</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">id</span></span></span>
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265
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265
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsConLikeOut</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dsConLike</span> <span class="n" style="color: #333;">con</span></span>
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266
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266
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIPVar</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"dsExpr: HsIPVar"</span></span>
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267
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267
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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell"><span class="n" style="color: #333;">dsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsOverLabel</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"dsExpr: HsOverLabel"</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#446cb12ca6cefaf1c6eb79b7db643632744263c7"><strong>compiler/GHC/Parser/PostProcess.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">@@ -2005,7 +2005,7 @@ patSynErr item l e explanation =</td>
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<pre style="margin: 0;"> <span id="LC2005" class="line" lang="haskell"> <span class="n" style="color: #333;">explanation</span></span>
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2006
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2006
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<pre style="margin: 0;"> <span id="LC2006" 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;">L</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">hsHoleExpr</span><span class="p">)</span> <span class="p">}</span></span>
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2007
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2007
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<pre style="margin: 0;"> <span id="LC2007" class="line" lang="haskell"></span>
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2008
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<pre style="margin: 0;">-<span id="LC2008" class="line" lang="haskell"><span class="n" style="color: #333;">hsHoleExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcPass</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">id</span></span><span class="p"><span class="idiff right">)</span></span></span>
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2008
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<pre style="margin: 0;">+<span id="LC2008" class="line" lang="haskell"><span class="n" style="color: #333;">hsHoleExpr</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;"><span class="idiff left right">GhcPs</span></span></span>
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2009
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2009
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<pre style="margin: 0;"> <span id="LC2009" class="line" lang="haskell"><span class="n" style="color: #333;">hsHoleExpr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsUnboundVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="n" style="color: #333;">mkVarOcc</span> <span class="s" style="color: #d14;">"_"</span><span class="p">)</span></span>
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2010
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2010
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<pre style="margin: 0;"> <span id="LC2010" class="line" lang="haskell"></span>
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2011
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<pre style="margin: 0;"> <span id="LC2011" class="line" lang="haskell"><span class="cd">-- | See Note [Ambiguous syntactic categories] and Note [PatBuilder]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#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">@@ -1449,8 +1449,8 @@ mkTyVarEqErr dflags ctxt report ct tv1 ty2</td>
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<pre style="margin: 0;"> <span id="LC1449" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mkTyVarEqErr'</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">report</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1450" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1451" class="line" lang="haskell"><span class="n" style="color: #333;">mkTyVarEqErr'</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">report</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC1452" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is<span class="idiff left">UserSkolem</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ctxt</span></span> <span class="n" style="color: #333;">tv1</span> <span class="c1" style="color: #998; font-style: italic;">-- ty2 won't be a meta-tyvar; we would have</span></span>
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1453
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<pre style="margin: 0;">-<span id="LC1453" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- swapped in Solver.Canonical.canEqTyVarHomo</span></span>
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is<span class="idiff left right">SkolemTyVar</span></span> <span class="n" style="color: #333;">tv1</span> <span class="c1" style="color: #998; font-style: italic;">-- ty2 won't be a meta-tyvar; we would have</span></span>
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<pre style="margin: 0;">+<span id="LC1453" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- swapped in Solver.Canonical.canEqTyVarHomo</span></span>
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<pre style="margin: 0;"> <span id="LC1454" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isTyVarTyVar</span> <span class="n" style="color: #333;">tv1</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTyVarTy</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1455" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">ctEqRel</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;">ReprEq</span></span>
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<pre style="margin: 0;"> <span id="LC1456" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The cases below don't really apply to ReprEq (except occurs check)</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">@@ -1592,6 +1592,7 @@ mkEqInfoMsg ct ty1 ty2</td>
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<pre style="margin: 0;"> <span id="LC1592" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is a non-injective type family"</span></span>
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<pre style="margin: 0;"> <span id="LC1593" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;"> <span id="LC1594" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1595" 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="LC1596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">isUserSkolem :: ReportErrCtxt -> TcTyVar -> Bool</span></span>
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<pre style="margin: 0;"> <span id="LC1597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- See Note [Reporting occurs-check errors]</span></span>
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<pre style="margin: 0;"> <span id="LC1598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">isUserSkolem ctxt tv</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">@@ -1602,6 +1603,7 @@ isUserSkolem ctxt tv</td>
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<pre style="margin: 0;"> <span id="LC1603" class="line" lang="haskell"></span>
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1604
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<pre style="margin: 0;"> <span id="LC1604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is_user_skol_info (InferSkol {}) = False</span></span>
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1605
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<pre style="margin: 0;"> <span id="LC1605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is_user_skol_info _ = True</span></span>
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<pre style="margin: 0;">+<span id="LC1606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1607
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<pre style="margin: 0;"> <span id="LC1607" class="line" lang="haskell"></span>
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1608
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<pre style="margin: 0;"> <span id="LC1608" class="line" lang="haskell"><span class="n" style="color: #333;">misMatchOrCND</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;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span></span>
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1609
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<pre style="margin: 0;"> <span id="LC1609" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Report</span></span>
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<li id="6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#6a1f039ed7725eddef15dd5f4dc318a3434f26c9"><strong>compiler/GHC/Tc/Gen/App.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">@@ -169,8 +169,10 @@ data HsExprArg (p :: TcPass)</td>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">EWrap</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XEWrap</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Wrapper, after instantiation</span></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">(</span><span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcPass</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XPass</span> <span class="n" style="color: #333;">p</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ValArgQL</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">va_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XPass</span> <span class="n" style="color: #333;">p</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ValArgQL</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">va_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="c1" style="color: #998; font-style: italic;">-- Original expression</span></span>
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For location and error msgs</span></span>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">va_fun</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;">GhcTc</span> <span class="c1" style="color: #998; font-style: italic;">-- Function, typechecked</span></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">va_args</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpInst</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Args, instantiated</span></span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">va_ty</span> <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;">-- Result type</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">@@ -181,6 +183,10 @@ mkEValArg :: SrcSpan -> LHsExpr GhcRn -> HsExprArg 'TcpRn</td>
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="haskell"><span class="n" style="color: #333;">mkEValArg</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eva_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">}</span></span>
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185
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="n" style="color: #333;">eValArgExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpInst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">eValArgExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e</span></span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"><span class="n" style="color: #333;">eValArgExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValArgQL</span> <span class="p">{</span> <span class="n" style="color: #333;">va_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e</span></span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"></span>
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184
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190
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">XPass</span> <span class="n" style="color: #333;">p</span> <span class="kr" style="font-weight: 600;">where</span></span>
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185
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191
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XPass</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">'Renamed</span></span>
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186
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192
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XPass</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpInst</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">'Renamed</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">@@ -281,7 +287,11 @@ isHsValArg _ = False</td>
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"><span class="n" style="color: #333;">countLeadingValArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="n" style="color: #333;">id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;"> <span id="LC288" class="line" lang="haskell"><span class="n" style="color: #333;">countLeadingValArgs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">countLeadingValArgs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC289" class="line" lang="haskell"><span class="n" style="color: #333;">countLeadingValArgs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EPar</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">countLeadingValArgs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC284" class="line" lang="haskell"><span class="n" style="color: #333;">countLeadingValArgs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"><span class="n" style="color: #333;">countLeadingValArgs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"><span class="n" style="color: #333;">isValArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="n" style="color: #333;">id</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="LC293" class="line" lang="haskell"><span class="n" style="color: #333;">isValArg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"><span class="n" style="color: #333;">isValArg</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="haskell"><span class="n" style="color: #333;">isArgPar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="n" style="color: #333;">id</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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287
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297
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="haskell"><span class="n" style="color: #333;">isArgPar</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EPar</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -320,11 +330,10 @@ tcInferSigmaTy (L loc rn_expr)</td>
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320
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="haskell"><span class="n" style="color: #333;">tcApp</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;">ExpRhoType</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;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC331" class="line" lang="haskell"><span class="n" style="color: #333;">tcApp</span> <span class="n" style="color: #333;">rn_expr</span> <span class="n" style="color: #333;">exp_res_ty</span></span>
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322
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332
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">rn_fun</span><span class="p">,</span> <span class="n" style="color: #333;">rn_args</span><span class="p">,</span> <span class="n" style="color: #333;">rebuild</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitHsApps</span> <span class="n" style="color: #333;">rn_expr</span></span>
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323
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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="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">impred</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">impred_call</span> <span class="n" style="color: #333;">rn_fun</span></span>
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324
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="haskell"></span>
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325
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tc_fun</span><span class="p">,</span> <span class="n" style="color: #333;">fun_sigma</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;">rn_fun</span> <span class="n" style="color: #333;">rn_args</span></span>
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<pre style="margin: 0;">+<span id="LC333" 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;">tc_fun</span><span class="p">,</span> <span class="n" style="color: #333;">fun_sigma</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;">rn_fun</span> <span class="n" style="color: #333;">rn_args</span></span>
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334
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Instantiate</span></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">impred</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;">ImpredicativeTypes</span></span>
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328
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<pre style="margin: 0;"> <span id="LC337" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span><span class="p">,</span> <span class="n" style="color: #333;">inst_args</span><span class="p">,</span> <span class="n" style="color: #333;">app_res_rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstFun</span> <span class="n" style="color: #333;">impred</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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338
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<pre style="margin: 0;"> <span id="LC338" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC339" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Quick look at result</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="358" 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="367" 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">@@ -358,14 +367,6 @@ tcApp rn_expr exp_res_ty</td>
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358
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<pre style="margin: 0;"> <span id="LC367" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: app_res_ty may be a polytype, via zonkQuickLook</span></span>
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359
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<pre style="margin: 0;"> <span id="LC368" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">addFunResCtxt</span> <span class="n" style="color: #333;">tc_fun</span> <span class="n" style="color: #333;">tc_args</span> <span class="n" style="color: #333;">app_res_rho</span> <span class="n" style="color: #333;">exp_res_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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360
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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell"> <span class="n" style="color: #333;">tcWrapResult</span> <span class="n" style="color: #333;">rn_expr</span> <span class="n" style="color: #333;">tc_expr</span> <span class="n" style="color: #333;">app_res_rho</span> <span class="n" style="color: #333;">exp_res_ty</span> <span class="p">}</span> <span class="p">}</span></span>
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361
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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="haskell"> <span class="n" style="color: #333;">impred_call</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;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Return True if this call can be instantiated impredicatively</span></span>
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<pre style="margin: 0;">-<span id="LC364" class="line" lang="haskell"> <span class="n" style="color: #333;">impred_call</span> <span class="n" style="color: #333;">rn_fun</span></span>
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<pre style="margin: 0;">-<span id="LC365" 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;">HsVar</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;">f</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rn_fun</span><span class="p">,</span> <span class="n" style="color: #333;">f</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">dollarIdKey</span></span>
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366
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<pre style="margin: 0;">-<span id="LC366" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- GHC's special case for ($)</span></span>
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<pre style="margin: 0;">-<span id="LC367" 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="LC368" class="line" lang="haskell"> <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;">ImpredicativeTypes</span></span>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC371" 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="LC372" 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;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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">@@ -402,11 +403,10 @@ tcInferAppHead_maybe fun args</td>
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<pre style="margin: 0;"> <span id="LC403" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsVar</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;">nm</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">tcInferId</span> <span class="n" style="color: #333;">nm</span></span>
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">go_rec_fld</span> <span class="n" style="color: #333;">f</span></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ExprWithTySig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC405" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isCompleteHsSig</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">add_ctxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">tcExprWithSig</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isCompleteHsSig</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">exprCtxt</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">tcExprWithSig</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">hs_ty</span></span>
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406
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408
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<pre style="margin: 0;"> <span id="LC408" 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;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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407
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409
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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408
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"> <span class="n" style="color: #333;">add_ctxt</span> <span class="n" style="color: #333;">thing</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;">exprCtxt</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="n" style="color: #333;">thing</span></span>
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409
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Disgusting special case for ambiguous record selectors</span></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="haskell"> <span class="n" style="color: #333;">go_rec_fld</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ambiguous</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arg1</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">filterOut</span> <span class="n" style="color: #333;">isArgPar</span> <span class="n" style="color: #333;">args</span> <span class="c1" style="color: #998; font-style: italic;">-- A value arg is first</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">@@ -444,8 +444,12 @@ tcValArgs quick_look fun args</td>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">arg_ty</span></span>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"></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;">-- Now check the argument</span></span>
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<pre style="margin: 0;">-<span id="LC447" 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;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">funAppCtxt</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">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="LC448" class="line" lang="haskell"> <span class="n" style="color: #333;">tcEValArg</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">arg_ty</span></span>
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<pre style="margin: 0;">+<span id="LC447" 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;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">funAppCtxt</span> <span class="n" style="color: #333;">fun</span> <span class="p">(</span><span class="n" style="color: #333;">eValArgExpr</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC448" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcEValArg"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC449" 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;">n</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"of"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fun</span></span>
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<pre style="margin: 0;">+<span id="LC450" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"arg type:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg_ty</span></span>
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<pre style="margin: 0;">+<span id="LC451" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"arg:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC452" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcEValArg</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">arg_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC453" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC454" 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;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">,</span> <span class="n" style="color: #333;">eva</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="n" style="color: #333;">arg'</span><span class="p">,</span> <span class="n" style="color: #333;">eva_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg_ty</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC455" 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">@@ -454,9 +458,10 @@ tcEValArg :: EValArg 'TcpInst -> TcSigmaType -> TcM (LHsExpr GhcTc)</td>
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"><span class="n" style="color: #333;">tcEValArg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span> <span class="n" style="color: #333;">exp_arg_sigma</span></span>
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<pre style="margin: 0;"> <span id="LC459" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcCheckPolyExprNC</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">exp_arg_sigma</span></span>
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC457" class="line" lang="haskell"><span class="n" style="color: #333;">tcEValArg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValArgQL</span> <span class="p">{</span> <span class="n" style="color: #333;">va_<span class="idiff left">loc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">loc</span></span><span class="p">,</span> <span class="n" style="color: #333;">va_fun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fun</span><span class="p">,</span> <span class="n" style="color: #333;">va_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC461" class="line" lang="haskell"><span class="n" style="color: #333;">tcEValArg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValArgQL</span> <span class="p">{</span> <span class="n" style="color: #333;">va_<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">L</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span><span class="p">,</span> <span class="n" style="color: #333;">va_fun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fun</span><span class="p">,</span> <span class="n" style="color: #333;">va_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</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;">va_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">app_res_rho</span><span class="p">,</span> <span class="n" style="color: #333;">va_rebuild</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rebuild</span> <span class="p">})</span> <span class="n" style="color: #333;">exp_arg_sigma</span></span>
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<pre style="margin: 0;">-<span id="LC459" 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;">"tcEValArg {"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">args</span> <span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC463" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC464" 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;">"tcEValArg {"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">args</span> <span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC465" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_args</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcValArgs</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC466" 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="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">app_res_rho</span> <span class="n" style="color: #333;">exp_arg_sigma</span></span>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcEValArg }"</span> <span class="n" style="color: #333;">empty</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">@@ -469,7 +474,7 @@ tcValArg :: HsExpr GhcRn -- The function (for error messages)</td>
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<pre style="margin: 0;"> <span id="LC474" 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;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Resulting argument</span></span>
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<pre style="margin: 0;"> <span id="LC475" class="line" lang="haskell"><span class="n" style="color: #333;">tcValArg</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;">arg_no</span></span>
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<pre style="margin: 0;"> <span id="LC476" class="line" lang="haskell"> <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;">fun</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">arg_no</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC472" 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;">"tcArg"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC477" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tc<span class="idiff left right">Val</span>Arg"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC478" 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;">arg_no</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"of"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fun</span></span>
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<pre style="margin: 0;"> <span id="LC479" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"arg type:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg_ty</span></span>
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<pre style="margin: 0;"> <span id="LC480" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"arg:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg</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">@@ -490,12 +495,14 @@ tcInstFun :: Bool -- True <=> ImpredicativeTypes is on; do quick-look</td>
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpInst</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="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstFun</span> <span class="n" style="color: #333;">impred_on</span> <span class="n" style="color: #333;">inst_final</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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<pre style="margin: 0;">-<span id="LC493" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpanFromArgs</span> <span class="n" style="color: #333;">rn_args</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC494" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Setting the location is important for the class constraints</span></span>
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<pre style="margin: 0;">-<span id="LC495" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that may be emitted from instantiating fun_sigma</span></span>
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<pre style="margin: 0;">-<span id="LC496" 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;">"tcInstFun"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rn_fun</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rn_args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC498" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcInstFun"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rn_fun</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rn_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;">go</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"> <span class="n" style="color: #333;">do_ql</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">impred_on</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">is_dollar</span> <span class="n" style="color: #333;">rn_fun</span></span>
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<pre style="margin: 0;">+<span id="LC502" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC's special case for ($)</span></span>
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"> <span class="n" style="color: #333;">is_dollar</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</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;">f</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">dollarIdKey</span></span>
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"> <span class="n" style="color: #333;">is_dollar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprCtOrigin</span> <span class="n" style="color: #333;">rn_fun</span></span>
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell"> <span class="n" style="color: #333;">herald</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"The function"</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;">rn_fun</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is applied to"</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">@@ -537,7 +544,10 @@ tcInstFun impred_on inst_final rn_fun fun_sigma rn_args</td>
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">need_instantiation</span> <span class="n" style="color: #333;">args</span></span>
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545
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"> <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;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">body</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;">fun_ty</span></span>
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539
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546
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<pre style="margin: 0;"> <span id="LC546" 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;">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="LC540" 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;">inst_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">fun_rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">instantiateSigma</span> <span class="n" style="color: #333;">fun_orig</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">theta</span> <span class="n" style="color: #333;">body</span></span>
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547
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<pre style="margin: 0;">+<span id="LC547" 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;">inst_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">fun_rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">setSrcSpanFromArgs</span> <span class="n" style="color: #333;">rn_args</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="haskell"> <span class="n" style="color: #333;">instantiateSigma</span> <span class="n" style="color: #333;">fun_orig</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">theta</span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Setting the location is important for the class constraints</span></span>
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<pre style="margin: 0;">+<span id="LC550" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that may be emitted from instantiating fun_sigma</span></span>
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">inst_tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">addArgWrap</span> <span class="n" style="color: #333;">wrap</span> <span class="n" style="color: #333;">acc</span><span class="p">)</span> <span class="n" style="color: #333;">so_far</span> <span class="n" style="color: #333;">fun_rho</span> <span class="n" style="color: #333;">args</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC553" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="590" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -590,9 +600,9 @@ tcInstFun impred_on inst_final rn_fun fun_sigma rn_args</td>
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"> <span class="n" style="color: #333;">go1</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">acc</span> <span class="n" style="color: #333;">so_far</span> <span class="n" style="color: #333;">fun_ty</span></span>
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602
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">eva</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="n" style="color: #333;">arg</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest_args</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC593" 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;">arg_ty</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;">matchActualFunTy</span> <span class="n" style="color: #333;">herald</span></span>
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<pre style="margin: 0;">-<span id="LC594" class="line" lang="haskell"> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rn_fun</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">(</span><span class="n" style="color: #333;">n_val_args</span><span class="p">,</span> <span class="n" style="color: #333;">so_far</span><span class="p">)</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">-<span id="LC595" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;"><span class="idiff left right">impred_on</span></span></span>
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<pre style="margin: 0;">+<span id="LC603" 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;">arg_ty</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;">matchActualFunTy</span> <span class="n" style="color: #333;">herald</span><span class="idiff left"> </span><span class="p"><span class="idiff">(</span></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">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rn_fun</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"> <span class="idiff left right"> </span> <span class="p">(</span><span class="n" style="color: #333;">n_val_args</span><span class="p">,</span> <span class="n" style="color: #333;">so_far</span><span class="p">)</span> <span class="n" style="color: #333;">fun_ty</span></span>
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605
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;"><span class="idiff left right">do_ql</span></span></span>
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596
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606
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<pre style="margin: 0;"> <span id="LC606" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">quickLookArg</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">arg_ty</span></span>
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597
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607
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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598
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608
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">acc'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eva</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg'</span><span class="p">,</span> <span class="n" style="color: #333;">eva_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg_ty</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="835" 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="845" 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">@@ -835,8 +845,10 @@ quickLookArg1 guarded delta larg@(L loc arg) arg_ty</td>
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835
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845
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">guarded</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">no_free_kappas</span><span class="p">)</span></span>
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836
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846
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<pre style="margin: 0;"> <span id="LC846" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">no_ql_result</span></span>
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837
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847
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span></span>
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838
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<td class="diff-line-num new_line old" data-linenumber="848" 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="LC838" 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;">delta_app</span><span class="p">,</span> <span class="n" style="color: #333;">inst_args</span><span class="p">,</span> <span class="n" style="color: #333;">app_res_rho</span><span class="p">)</span></span>
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839
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<pre style="margin: 0;">-<span id="LC839" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstFun</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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848
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<pre style="margin: 0;">+<span id="LC848" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">impred_on</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;">ImpredicativeTypes</span></span>
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849
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If the parent call is (e1 $ e2) then -XImpredicativeTypes might not be on</span></span>
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850
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">delta_app</span><span class="p">,</span> <span class="n" style="color: #333;">inst_args</span><span class="p">,</span> <span class="n" style="color: #333;">app_res_rho</span><span class="p">)</span></span>
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851
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstFun</span> <span class="n" style="color: #333;">impred_on</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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840
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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;">traceTc</span> <span class="s" style="color: #d14;">"quickLookArg"</span> <span class="o" style="font-weight: 600;">$</span></span>
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841
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853
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"arg:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg</span></span>
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842
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854
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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;">text</span> <span class="s" style="color: #d14;">"delta:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">delta</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="849" 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="861" 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">@@ -849,7 +861,7 @@ quickLookArg1 guarded delta larg@(L loc arg) arg_ty</td>
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849
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">delta'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">delta</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">delta_app</span></span>
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850
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862
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">qlUnify</span> <span class="n" style="color: #333;">delta'</span> <span class="n" style="color: #333;">arg_ty</span> <span class="n" style="color: #333;">app_res_rho</span></span>
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863
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC852" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ql_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ValArgQL</span> <span class="p">{</span> <span class="n" style="color: #333;">va_<span class="idiff left">loc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">loc</span></span><span class="p">,</span> <span class="n" style="color: #333;">va_fun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fun'</span></span>
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864
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ql_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ValArgQL</span> <span class="p">{</span> <span class="n" style="color: #333;">va_<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="n" style="color: #333;"><span class="idiff right">larg</span></span><span class="p">,</span> <span class="n" style="color: #333;">va_fun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fun'</span></span>
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">va_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inst_args</span></span>
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854
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866
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">va_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">app_res_rho</span></span>
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855
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867
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">va_rebuild</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rebuild</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="953" 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">@@ -941,12 +953,9 @@ qlUnify delta ty1 ty2</td>
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941
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953
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<pre style="margin: 0;"> <span id="LC953" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">kappa</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">ty2_tvs</span></span>
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942
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954
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<pre style="margin: 0;"> <span id="LC954" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- Occurs-check</span></span>
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943
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955
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<pre style="margin: 0;"> <span id="LC955" class="line" lang="haskell"></span>
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944
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<pre style="margin: 0;">-<span id="LC944" class="line" lang="haskell"><span class="cd">-- | not (isAlmostFunctionFree ty2)</span></span>
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945
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<pre style="margin: 0;">-<span id="LC945" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- = return () -- Sigh. See Note [Quick Look at type families]</span></span>
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946
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"></span>
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947
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956
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<pre style="margin: 0;"> <span id="LC956" 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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948
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957
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<pre style="margin: 0;"> <span id="LC957" 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="c1" style="color: #998; font-style: italic;">-- Unify the kinds; see Note [Kinds in QL unify]</span></span>
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949
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<pre style="margin: 0;">-<span id="LC949" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">co</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">unifyType</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nothing</span></span> <span class="n" style="color: #333;">ty2_kind</span> <span class="n" style="color: #333;">kappa_kind</span></span>
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958
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<pre style="margin: 0;">+<span id="LC958" 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">co</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">unifyKind</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">Just</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty2</span></span><span class="p"><span class="idiff right">))</span></span> <span class="n" style="color: #333;">ty2_kind</span> <span class="n" style="color: #333;">kappa_kind</span></span>
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959
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<pre style="margin: 0;"> <span id="LC959" class="line" lang="haskell"></span>
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951
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960
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<pre style="margin: 0;"> <span id="LC960" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"qlUnify:update"</span> <span class="o" style="font-weight: 600;">$</span></span>
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952
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961
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<pre style="margin: 0;"> <span id="LC961" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">kappa</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">kappa_kind</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="967" 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">@@ -958,7 +967,6 @@ qlUnify delta ty1 ty2</td>
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<pre style="margin: 0;"> <span id="LC967" class="line" lang="haskell"> <span class="n" style="color: #333;">ty2_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">ty2</span></span>
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968
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<pre style="margin: 0;"> <span id="LC968" class="line" lang="haskell"> <span class="n" style="color: #333;">kappa_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">kappa</span></span>
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969
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<pre style="margin: 0;"> <span id="LC969" class="line" lang="haskell"></span>
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961
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<pre style="margin: 0;">-<span id="LC961" class="line" lang="haskell"></span>
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962
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970
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<pre style="margin: 0;"> <span id="LC970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Quick Look and type families]</span></span>
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963
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971
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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964
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972
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<pre style="margin: 0;"> <span id="LC972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Gah! See impredicative/T18126-nasty.</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1539" 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">@@ -1531,7 +1539,8 @@ addFunResCtxt fun args fun_res_ty env_ty</td>
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1531
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1539
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<pre style="margin: 0;"> <span id="LC1539" 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;">"Probable cause:"</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;">fun</span><span class="p">)</span></span>
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1532
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1540
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<pre style="margin: 0;"> <span id="LC1540" 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;">"is applied to too few arguments"</span></span>
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1533
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1541
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<pre style="margin: 0;"> <span id="LC1541" class="line" lang="haskell"></span>
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1534
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<pre style="margin: 0;">-<span id="LC1534" 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;">args</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Is applied to at least one arg</span></span>
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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- n_fun < n_env</span></span>
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1543
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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">n_fun</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isValArg</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">n_env</span></span>
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1535
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1544
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<pre style="margin: 0;"> <span id="LC1544" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not_fun</span> <span class="n" style="color: #333;">res_fun</span></span>
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1536
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1545
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<pre style="margin: 0;"> <span id="LC1545" 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;">"Possible cause:"</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;">fun</span><span class="p">)</span></span>
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1537
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1546
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<pre style="margin: 0;"> <span id="LC1546" 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;">"is applied to too many arguments"</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1604" 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="1613" 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">@@ -1604,7 +1613,9 @@ tcExprPrag (HsPragTick x1 src info srcInfo) = HsPragTick x1 src info srcInfo</td>
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1604
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1613
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<pre style="margin: 0;"> <span id="LC1613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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1605
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1614
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<pre style="margin: 0;"> <span id="LC1614" class="line" lang="haskell"></span>
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1606
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1615
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<pre style="margin: 0;"> <span id="LC1615" class="line" lang="haskell"><span class="n" style="color: #333;">addExprCtxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRn</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;">TcRn</span> <span class="n" style="color: #333;">a</span></span>
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1607
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<pre style="margin: 0;">-<span id="LC1607" class="line" lang="haskell"><span class="n" style="color: #333;">addExprCtxt</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">thing_inside</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;">exprCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">e</span><span class="p">))</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC1616" class="line" lang="haskell"><span class="n" style="color: #333;">addExprCtxt</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;">e</span><span class="p">)</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC1617" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isAtomicHsExpr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC1618" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">exprCtxt</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="n" style="color: #333;">thing_inside</span></span>
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1619
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<pre style="margin: 0;"> <span id="LC1619" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1620" class="line" lang="haskell"><span class="n" style="color: #333;">exprCtxt</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;">SDoc</span></span>
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1621
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<pre style="margin: 0;"> <span id="LC1621" class="line" lang="haskell"><span class="n" style="color: #333;">exprCtxt</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"In the expression:"</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">stripParensHsExpr</span> <span class="n" style="color: #333;">expr</span><span class="p">))</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#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">@@ -345,7 +345,7 @@ tcExpr expr@(SectionR x op arg2) res_ty</td>
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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="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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346
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<pre style="margin: 0;"> <span id="LC346" 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="LC347" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTysRho</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>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="haskell"> <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;"><span class="idiff left right">unLoc</span></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="LC348" class="line" lang="haskell"> <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;"><span class="idiff left right">ppr</span></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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349
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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;">arg2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcValArg</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="LC350" 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="LC351" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -365,7 +365,7 @@ tcExpr expr@(SectionL x arg1 op) res_ty</td>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC366" 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="LC367" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTysRho</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>
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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell"> <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;"><span class="idiff left right">unLoc</span></span> <span class="n" style="color: #333;">op</span><span class="p">))</span> <span class="n" style="color: #333;">n_reqd_args</span> <span class="n" style="color: #333;">op_ty</span></span>
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368
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"> <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;"><span class="idiff left right">ppr</span></span> <span class="n" style="color: #333;">op</span><span class="p">))</span> <span class="n" style="color: #333;">n_reqd_args</span> <span class="n" style="color: #333;">op_ty</span></span>
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369
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369
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<pre style="margin: 0;"> <span id="LC369" 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;">tcValArg</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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370
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370
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<pre style="margin: 0;"> <span id="LC370" 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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371
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371
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<pre style="margin: 0;"> <span id="LC371" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -853,7 +853,7 @@ tcExpr expr@(RecordUpd { rupd_expr = record_expr, rupd_flds = rbnds }) res_ty</td>
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853
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853
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<pre style="margin: 0;"> <span id="LC853" 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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854
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854
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<pre style="margin: 0;"> <span id="LC854" 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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855
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855
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"></span>
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856
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<pre style="margin: 0;">-<span id="LC856" 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;"><span class="idiff left right">unLoc</span></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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856
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<pre style="margin: 0;">+<span id="LC856" 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;"><span class="idiff left right">ppr</span></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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857
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857
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<pre style="margin: 0;"> <span id="LC857" 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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858
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858
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<pre style="margin: 0;"> <span id="LC858" 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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859
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to be normal datatypes -- no contravariant stuff can go on</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">@@ -953,17 +953,14 @@ tcUnboundId :: HsExpr GhcRn -> OccName -> ExpRhoType -> TcM (HsExpr GhcTc)</td>
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953
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953
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<pre style="margin: 0;"> <span id="LC953" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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954
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954
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<pre style="margin: 0;"> <span id="LC954" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Some of these started life as a true expression hole "_".</span></span>
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955
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955
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<pre style="margin: 0;"> <span id="LC955" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Others might simply be variables that accidentally have no binding site</span></span>
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956
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<pre style="margin: 0;">-<span id="LC956" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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957
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<pre style="margin: 0;">-<span id="LC957" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We turn all of them into HsVar, since HsUnboundVar can't contain an</span></span>
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958
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<pre style="margin: 0;">-<span id="LC958" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Id; and indeed the evidence for the ExprHole does bind it, so it's</span></span>
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<pre style="margin: 0;">-<span id="LC959" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not unbound any more!</span></span>
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<pre style="margin: 0;"> <span id="LC956" class="line" lang="haskell"><span class="n" style="color: #333;">tcUnboundId</span> <span class="n" style="color: #333;">rn_expr</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC957" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenFlexiTyVarTy</span> <span class="c1" style="color: #998; font-style: italic;">-- Allow Int# etc (#12531)</span></span>
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958
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<pre style="margin: 0;"> <span id="LC958" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newSysName</span> <span class="n" style="color: #333;">occ</span></span>
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963
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<pre style="margin: 0;"> <span id="LC959" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLocalId</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">ty</span></span>
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964
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<pre style="margin: 0;"> <span id="LC960" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitNewExprHole</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC965" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcWrapResultO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnboundOccurrenceOf</span> <span class="n" style="color: #333;">occ</span><span class="p">)</span> <span class="n" style="color: #333;">rn_expr</span></span>
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966
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<pre style="margin: 0;">-<span id="LC966" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">))</span> <span class="n" style="color: #333;">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="LC961" 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;">HsUnboundVar</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">occ</span></span>
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<pre style="margin: 0;">+<span id="LC962" 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;">UnboundOccurrenceOf</span> <span class="n" style="color: #333;">occ</span></span>
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="haskell"> <span class="p">;</span> <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;">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="LC964" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC965" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC966" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/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">@@ -2408,7 +2408,7 @@ kcCheckDeclHeader_sig kisig name flav</td>
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<pre style="margin: 0;"> <span id="LC2408" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">KindedTyVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">v</span> <span class="n" style="color: #333;">v_hs_ki</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC2409" class="line" lang="haskell"> <span class="n" style="color: #333;">v_ki</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLHsKindSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarBndrKindCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">v</span><span class="p">))</span> <span class="n" style="color: #333;">v_hs_ki</span></span>
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<pre style="margin: 0;"> <span id="LC2410" class="line" lang="haskell"> <span class="n" style="color: #333;">discardResult</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [discardResult in kcCheckDeclHeader_sig]</span></span>
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<pre style="margin: 0;">-<span id="LC2411" class="line" lang="haskell"> <span class="n" style="color: #333;">unifyKind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">HsTyVar</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">noExtField</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">NotPromoted</span></span> <span class="n" style="color: #333;">v</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC2411" class="line" lang="haskell"> <span class="n" style="color: #333;">unifyKind</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;"><span class="idiff left right">ppr</span></span> <span class="n" style="color: #333;">v</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC2412" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tyBinderType</span> <span class="n" style="color: #333;">tb</span><span class="p">)</span></span>
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2413
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<pre style="margin: 0;"> <span id="LC2413" class="line" lang="haskell"> <span class="n" style="color: #333;">v_ki</span></span>
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2414
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<pre style="margin: 0;"> <span id="LC2414" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2954" 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">@@ -2954,7 +2954,7 @@ tcHsQTyVarBndr _ new_tv (KindedTyVar _ _ (L _ tv_nm) lhs_kind)</td>
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2954
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<pre style="margin: 0;"> <span id="LC2954" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb_tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLookupLcl_maybe</span> <span class="n" style="color: #333;">tv_nm</span></span>
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2955
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2955
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<pre style="margin: 0;"> <span id="LC2955" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2956
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2956
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<pre style="margin: 0;"> <span id="LC2956" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATyVar</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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2957
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<pre style="margin: 0;">-<span id="LC2957" 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;">discardResult</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unifyKind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;"><span class="idiff left right">hs_tv</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2957" 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;">discardResult</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unifyKind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv_nm</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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2958
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<pre style="margin: 0;"> <span id="LC2958" class="line" lang="haskell"> <span class="n" style="color: #333;">kind</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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2959
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2959
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<pre style="margin: 0;"> <span id="LC2959" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This unify rejects:</span></span>
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2960
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2960
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<pre style="margin: 0;"> <span id="LC2960" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- class C (m :: * -> *) 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">@@ -2962,9 +2962,6 @@ tcHsQTyVarBndr _ new_tv (KindedTyVar _ _ (L _ tv_nm) lhs_kind)</td>
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<pre style="margin: 0;"> <span id="LC2962" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">tv</span> <span class="p">}</span></span>
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2963
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2963
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<pre style="margin: 0;"> <span id="LC2963" class="line" lang="haskell"></span>
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2964
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2964
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<pre style="margin: 0;"> <span id="LC2964" 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;">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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2965
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<pre style="margin: 0;">-<span id="LC2965" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2966
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<pre style="margin: 0;">-<span id="LC2966" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsTyVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">NotPromoted</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="n" style="color: #333;">tv_nm</span><span class="p">)</span></span>
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2967
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<pre style="margin: 0;">-<span id="LC2967" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Used for error messages only</span></span>
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<pre style="margin: 0;"> <span id="LC2965" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2966" 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="LC2967" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Binding type/class variables in 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">@@ -412,7 +412,7 @@ tc_pat pat_ty penv ps_pat thing_inside = case ps_pat of</td>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">expr_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="haskell"> <span class="n" style="color: #333;">herald</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"A view pattern expression expects"</span></span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">expr_wrap1</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">inf_arg_ty</span><span class="p">],</span> <span class="n" style="color: #333;">inf_res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC415" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTysRho</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">expr_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;"><span class="idiff left right">unLoc</span></span> <span class="n" style="color: #333;">expr</span><span class="p">))</span> <span class="mi" style="color: #099;">1</span> <span class="n" style="color: #333;">expr_ty</span></span>
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTysRho</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">expr_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;"><span class="idiff left right">ppr</span></span> <span class="n" style="color: #333;">expr</span><span class="p">))</span> <span class="mi" style="color: #099;">1</span> <span class="n" style="color: #333;">expr_ty</span></span>
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expr_wrap1 :: expr_ty "->" (inf_arg_ty -> inf_res_ty)</span></span>
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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC418" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that overall pattern is more polymorphic than arg type</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#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">@@ -874,7 +874,7 @@ tcDataFamInstHeader mb_clsinfo fam_tc imp_vars mb_bndrs fixity</td>
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs_kind</span></span>
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lhs_applied_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs_ty</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcAppTys</span><span class="p">`</span> <span class="n" style="color: #333;">lhs_extra_args</span></span>
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nlHsTyConApp</span> <span class="n" style="color: #333;">fixity</span> <span class="p">(</span><span class="n" style="color: #333;">getName</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">)</span> <span class="n" style="color: #333;">hs_pats</span></span>
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyKind</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;"><span class="idiff left right">unLoc</span></span> <span class="n" style="color: #333;">hs_lhs</span><span class="p">))</span> <span class="n" style="color: #333;">lhs_applied_kind</span> <span class="n" style="color: #333;">res_kind</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyKind</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;"><span class="idiff left right">ppr</span></span> <span class="n" style="color: #333;">hs_lhs</span><span class="p">))</span> <span class="n" style="color: #333;">lhs_applied_kind</span> <span class="n" style="color: #333;">res_kind</span></span>
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that the result kind of the TyCon applied to its args</span></span>
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is compatible with the explicit signature (or Type, if there</span></span>
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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is none)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#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">@@ -84,7 +84,7 @@ import Control.Arrow ( second )</td>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returning an uninstantiated sigma-type</span></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTy</span></span>
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<pre style="margin: 0;"> <span id="LC86" 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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<pre style="margin: 0;">-<span id="LC87" 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 class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsExpr</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="p"><span class="idiff right">)</span></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="LC87" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">SDoc</span></span><span class="idiff right"> </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="LC88" 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;">Arity</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="c1" style="color: #998; font-style: italic;">-- Total number of value args in the call, and</span></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- types of values args to which function has</span></span>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- been applied already (reversed)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -186,7 +186,7 @@ Ugh!</td>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for example in function application</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">matchActualFunTysRho</span> <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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<pre style="margin: 0;"> <span id="LC188" 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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<pre style="margin: 0;">-<span id="LC189" 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 class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsExpr</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </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="LC189" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">SDoc</span></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="LC190" 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="LC191" 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="LC192" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -521,7 +521,7 @@ tcWrapResultO :: CtOrigin -> HsExpr GhcRn -> HsExpr GhcTcId -> TcSigmaType -> Ex</td>
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<pre style="margin: 0;"> <span id="LC521" 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="LC522" 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="LC523" 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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524
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<pre style="margin: 0;">-<span id="LC524" 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;"><span class="idiff left right">rn_expr</span></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="LC524" 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="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rn_expr</span></span><span class="p"><span class="idiff right">)</span>)</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="LC525" 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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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC527" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -535,7 +535,7 @@ tcWrapResultMono rn_expr expr act_ty res_ty</td>
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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;">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="LC536" 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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537
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<pre style="margin: 0;"> <span id="LC537" 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="LC538" 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;"><span class="idiff left right">rn_expr</span></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="LC538" 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="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rn_expr</span></span><span class="p"><span class="idiff right">)</span>)</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="LC539" 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="LC540" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC541" 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">@@ -567,7 +567,7 @@ tcSubType orig ctxt ty_actual ty_expected</td>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC568" 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;">-- Used when instantiating</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="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="c1" style="color: #998; font-style: italic;">-- Used when skolemising</span></span>
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570
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<pre style="margin: 0;">-<span id="LC570" 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 class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsExpr</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="p"><span class="idiff right">)</span></span> <span class="c1" style="color: #998; font-style: italic;">-- The expression that has type 'actual' (if known)</span></span>
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<pre style="margin: 0;">+<span id="LC570" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">SDoc</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- The expression that has type 'actual' (if known)</span></span>
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<pre style="margin: 0;"> <span id="LC571" 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 type</span></span>
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572
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span> <span class="c1" style="color: #998; font-style: italic;">-- Expected type</span></span>
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573
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<pre style="margin: 0;"> <span id="LC573" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1173,8 +1173,9 @@ The exported functions are all defined as versions of some</td>
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1173
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<pre style="margin: 0;"> <span id="LC1173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">non-exported generic functions.</span></span>
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1174
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1174
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<pre style="margin: 0;"> <span id="LC1174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1175
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1175
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<pre style="margin: 0;"> <span id="LC1175" class="line" lang="haskell"></span>
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1176
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<pre style="margin: 0;">-<span id="LC1176" class="line" lang="haskell"><span class="n" style="color: #333;">unifyType</span> <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;">-- ^ If present, has type 'ty1'</span></span>
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1177
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<pre style="margin: 0;">-<span id="LC1177" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</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;">TcCoercionN</span></span>
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1176
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<pre style="margin: 0;">+<span id="LC1176" class="line" lang="haskell"><span class="n" style="color: #333;">unifyType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ If present, the thing that has type ty1</span></span>
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<pre style="margin: 0;">+<span id="LC1177" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</span> <span class="c1" style="color: #998; font-style: italic;">-- ty1, ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1178" 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;">TcCoercionN</span> <span class="c1" style="color: #998; font-style: italic;">-- :: ty1 ~# ty2</span></span>
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1179
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<pre style="margin: 0;"> <span id="LC1179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Actual and expected types</span></span>
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1180
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<pre style="margin: 0;"> <span id="LC1180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns a coercion : ty1 ~ ty2</span></span>
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1181
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<pre style="margin: 0;"> <span id="LC1181" class="line" lang="haskell"><span class="n" style="color: #333;">unifyType</span> <span class="n" style="color: #333;">thing</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</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">@@ -1197,13 +1198,13 @@ unifyTypeET ty1 ty2</td>
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<pre style="margin: 0;"> <span id="LC1198" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">uo_visible</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1199" class="line" lang="haskell"></span>
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1200
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<pre style="margin: 0;"> <span id="LC1200" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1200" class="line" lang="haskell"><span class="n" style="color: #333;">unifyKind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsType</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="p"><span class="idiff right">)</span></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;">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;">CoercionN</span></span>
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<pre style="margin: 0;">-<span id="LC1201" class="line" lang="haskell"><span class="n" style="color: #333;">unifyKind</span> <span class="n" style="color: #333;">thing</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1201" class="line" lang="haskell"><span class="n" style="color: #333;">unifyKind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">SDoc</span></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;">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;">CoercionN</span></span>
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<pre style="margin: 0;">+<span id="LC1202" class="line" lang="haskell"><span class="n" style="color: #333;">unifyKind</span> <span class="n" style="color: #333;"><span class="idiff left right">mb_</span>thing</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC1203" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uType</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC1204" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1205" class="line" lang="haskell"> <span class="n" style="color: #333;">origin</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeEqOrigin</span> <span class="p">{</span> <span class="n" style="color: #333;">uo_actual</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="LC1206" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">uo_expected</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="LC1206" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">uo_thing</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">ppr</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;">thing</span></span>
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<pre style="margin: 0;">+<span id="LC1207" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">uo_thing</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">mb_</span>thing</span></span>
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<pre style="margin: 0;"> <span id="LC1208" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">uo_visible</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1209" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1210" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#3579790a89a1f3d4cd2c621037453b23ed04a87b"><strong>compiler/GHC/Tc/Utils/Unify.hs-boot</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -4,12 +4,10 @@ import GHC.Prelude</td>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.Expr</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HsType</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.Extension</span> <span class="p">(</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="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This boot file exists only to tie the knot between</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GHC.Tc.Utils.Unify and Inst</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">unifyType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsExpr</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</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;">TcCoercion</span></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">unifyKind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsType</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</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;">TcCoercion</span></span></pre>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">unifyType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">SDoc</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</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;">TcCoercion</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">unifyKind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">SDoc</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</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;">TcCoercion</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#6a120b0673f8920127d8fffdaa16f01b90cc92d7"><strong>compiler/GHC/Tc/Utils/Zonk.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">@@ -915,8 +915,8 @@ zonkExpr env (XExpr (HsWrap co_fn expr))</td>
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<pre style="margin: 0;"> <span id="LC915" class="line" lang="haskell"> <span class="n" style="color: #333;">new_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkExpr</span> <span class="n" style="color: #333;">env1</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrap</span> <span class="n" style="color: #333;">new_co_fn</span> <span class="n" style="color: #333;">new_expr</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC918" class="line" lang="haskell"><span class="n" style="color: #333;">zonkExpr</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">e</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsUnboundVar</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="LC919" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;"><span class="idiff left right">e</span></span></span>
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<pre style="margin: 0;">+<span id="LC918" class="line" lang="haskell"><span class="n" style="color: #333;">zonkExpr</span> <span class="n" style="color: #333;"><span class="idiff left">env</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">HsUnboundVar</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">occ</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsUnboundVar</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">zonkIdOcc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">occ</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"><span class="n" style="color: #333;">zonkExpr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"zonkExpr"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#742581bc447da42bbc346f7d2529e6aa9c77f20c"><strong>testsuite/tests/impredicative/T18126-nasty.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">@@ -9,6 +9,8 @@ module Bug where</td>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (which here is switched on by ($))</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- beecause of a very subtle issue where we instantiate an</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- instantiation variable with (F alpha), where F is a type function</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It's a stripped-dwn version of T5490</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">register</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">rs</span> <span class="n" style="color: #333;">op_ty</span><span class="o" style="font-weight: 600;">.</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HDrop</span> <span class="n" style="color: #333;">rs</span> <span class="o" style="font-weight: 600;">~</span> <span class="kt" style="color: #458; font-weight: 600;">HSingle</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WaitOpResult</span> <span class="n" style="color: #333;">op_ty</span><span class="p">))</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#c41ecb9c589d5a88e103cc93ddcc3f4255442d00"><strong>testsuite/tests/indexed-types/should_fail/T4485.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">@@ -13,10 +13,11 @@ T4485.hs:50:15: error:</td>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> (The choice depends on the instantiation of ‘m0’</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> To pick the first instance above, use IncoherentInstances</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> when compiling the other instance declarations)</span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext"> • In the first argument of ‘($)’, namely ‘asChild’</span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext"> In the expression: asChild $ (genElement "foo")</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> • In the expression: asChild $ (genElement "foo")</span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext"> In an equation for ‘asChild’:</span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext"> asChild b = asChild $ (genElement "foo")</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> In the instance declaration for</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> ‘EmbedAsChild (IdentityT IO) FooBar’</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">T4485.hs:50:26: error:</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"> • Ambiguous type variable ‘m0’ arising from a use of ‘genElement’</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#22b4051faa20447752f5080f6f120fbeba6602b8"><strong>testsuite/tests/typecheck/should_compile/T13050.hs</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">HolesInfix</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="haskell"><span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="n" style="color: #333;">g</span><span class="p">,</span> <span class="n" style="color: #333;">q</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">--</span>f, g, q :: Int -> Int -> Int</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span> <span class="p">`</span><span class="kr" style="font-weight: 600;">_</span><span class="p">`</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">q</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span> <span class="p">`</span><span class="n" style="color: #333;">_a</span><span class="p">`</span> <span class="n" style="color: #333;">y</span></span></pre>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">--</span>g x y = x `_` y</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">--</span>q x y = x `_a` y</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#ef045b7d39e671fe4c034f0234f8e3b210dae601"><strong>testsuite/tests/typecheck/should_compile/T5490.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">@@ -8,7 +8,6 @@</td>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MultiParamTypeClasses #-}</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleContexts #-}</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleInstances #-}</span></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeApplications #-}</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">await</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bug</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC13" 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">@@ -23,6 +22,8 @@ fromAttempt ∷ Attempt α → IO α</td>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">fromAttempt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Success</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">fromAttempt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Failure</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">throwIO</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Inject</span> <span class="n" style="color: #333;">f</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">α</span> <span class="o" style="font-weight: 600;">=</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∀</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">β</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Inject</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">β</span><span class="p">)</span> <span class="p">(</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">α</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">β</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Completable</span> <span class="n" style="color: #333;">f</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="n" style="color: #333;">complete</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="n" style="color: #333;">f</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">α</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">α</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC29" 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">@@ -83,34 +84,29 @@ instance (Typeable n, Exception e) ⇒ Exception (NthException n e)</td>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">WaitOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WaitOps</span> <span class="n" style="color: #333;">rs</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">WaitOpResult</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WaitOps</span> <span class="n" style="color: #333;">rs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HElemOf</span> <span class="n" style="color: #333;">rs</span></span>
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<pre style="margin: 0;">-<span id="LC86" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC87" class="line" lang="haskell"><span class="n" style="color: #333;">inj</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Peano</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Attempt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HNth</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Attempt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HElemOf</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC88" class="line" lang="haskell"><span class="n" style="color: #333;">inj</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">error</span> <span class="s" style="color: #d14;">"urk"</span></span>
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<pre style="margin: 0;">-<span id="LC89" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC90" class="line" lang="haskell"><span class="n" style="color: #333;">rwo</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">rs</span> <span class="n" style="color: #333;">f</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Attempt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WaitOpResult</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WaitOps</span> <span class="n" style="color: #333;">rs</span><span class="p">)))</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC91" class="line" lang="haskell"><span class="n" style="color: #333;">rwo</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC92" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">register</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∀</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Peano</span> <span class="n" style="color: #333;">n</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kt" style="color: #458; font-weight: 600;">WaitOps</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HDrop</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">rs</span><span class="p">)</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC93" class="line" lang="haskell"> <span class="n" style="color: #333;">register</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WaitOp</span> <span class="p">(</span><span class="n" style="color: #333;">op</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">op_ty</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC94" class="line" lang="haskell"> <span class="p">(((</span><span class="o" style="font-weight: 600;">$</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- (px -> qx) -> px -> qx px=a_a2iT qx=b_a2iU</span></span>
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<pre style="margin: 0;">-<span id="LC95" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Inject</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Instantiate at ax=a2iW bx=a2iX;</span></span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (ax -> bx) -> Inject f ax</span></span>
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<pre style="margin: 0;">-<span id="LC97" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ql with arg or Inject: f bx ~ f (Attempt (WaitOpReslt (WaitOps rs)))</span></span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bx := Attempt (WaitOpResult (WaitOps rs) = Attempt (HElemOf rs)</span></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- px := (ax -> bx)</span></span>
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- qx := Inject f ax</span></span>
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">inj</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- instantiate lx=l_a2iZ;</span></span>
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Attempt (HNth n lx) -> Attempt (HElemOf lx)</span></span>
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- res_ty px = (ax->bx) ~ Attempt (HNth n lx) -> Attempt (HElemOf lx)</span></span>
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ax := Attempt (HNth n lx)</span></span>
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<pre style="margin: 0;">-<span id="LC105" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bx := Attempt (HElemOf lx)</span></span>
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<pre style="margin: 0;">-<span id="LC106" class="line" lang="haskell"> <span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Inject</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Attempt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WaitOpResult</span> <span class="n" style="color: #333;">op_ty</span><span class="p">)))</span></span>
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107
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<pre style="margin: 0;">-<span id="LC107" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Result ql: Attempt (WaitOpResult op_ty) ~ ax = Attempt (HNth n lx)</span></span>
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108
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<pre style="margin: 0;">-<span id="LC108" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">seq</span><span class="p">`</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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109
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<pre style="margin: 0;">-<span id="LC109" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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110
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="haskell"></span>
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111
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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"></span>
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112
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Inject</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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113
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<pre style="margin: 0;">-<span id="LC113" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Inject</span> <span class="o" style="font-weight: 600;">::</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∀</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Inject</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"> <span class="n" style="color: #333;">registerWaitOp</span> <span class="n" style="color: #333;">ops</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inj</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Success</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Success</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HNth</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="89" 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">
89
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"> <span class="n" style="color: #333;">inj</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Failure</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Failure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NthException</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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90
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"> <span class="n" style="color: #333;">register</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∀</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">HDropClass</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">rs</span></span>
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<td class="diff-line-num new new_line" data-linenumber="91" 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="LC91" class="line" lang="haskell"> <span class="err" style="color: #a61717; background-color: #e3d2d2;">⇒</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kt" style="color: #458; font-weight: 600;">Peano</span> <span class="n" style="color: #333;">n</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kt" style="color: #458; font-weight: 600;">WaitOps</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HDrop</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">rs</span><span class="p">)</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"> <span class="n" style="color: #333;">register</span> <span class="n" style="color: #333;">first</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WaitOp</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"> <span class="n" style="color: #333;">t</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">←</span> <span class="n" style="color: #333;">try</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">registerWaitOp</span> <span class="n" style="color: #333;">op</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Inject</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">inj</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="94" 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">
94
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"> <span class="n" style="color: #333;">r</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">←</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">t</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num new new_line" data-linenumber="95" 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">
95
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">r</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">r</span></span>
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<td class="diff-line-num new new_line" data-linenumber="96" 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">
96
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="n" style="color: #333;">e</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="n" style="color: #333;">complete</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">inj</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Failure</span> <span class="p">(</span><span class="n" style="color: #333;">e</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="kt" style="color: #458; font-weight: 600;">SomeException</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="97" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
97
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">first</span></span>
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<td class="diff-line-num new new_line" data-linenumber="98" 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">
98
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"> <span class="n" style="color: #333;">register</span> <span class="n" style="color: #333;">first</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="n" style="color: #333;">op</span> <span class="o" style="font-weight: 600;">:?</span> <span class="n" style="color: #333;">ops'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num new new_line" data-linenumber="99" 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">
99
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"> <span class="n" style="color: #333;">t</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">←</span> <span class="n" style="color: #333;">try</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">registerWaitOp</span> <span class="n" style="color: #333;">op</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Inject</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">inj</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="100" 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">
100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">t</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num new new_line" data-linenumber="101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">waitOpsNonEmpty</span> <span class="n" style="color: #333;">ops'</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num new new_line" data-linenumber="102" 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">
102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HNonEmptyInst</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">hTailDropComm</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="kt" style="color: #458; font-weight: 600;">HTailDropComm</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">rs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num new new_line" data-linenumber="103" 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">
103
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HTailDropComm</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="n" style="color: #333;">register</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PSucc</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="n" style="color: #333;">ops'</span></span>
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<td class="diff-line-num new new_line" data-linenumber="104" 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">
104
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">first</span></span>
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<td class="diff-line-num new new_line" data-linenumber="105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="n" style="color: #333;">e</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num new new_line" data-linenumber="106" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"> <span class="n" style="color: #333;">c</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">←</span> <span class="n" style="color: #333;">complete</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">inj</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Failure</span> <span class="p">(</span><span class="n" style="color: #333;">e</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="kt" style="color: #458; font-weight: 600;">SomeException</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
107
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">first</span></span>
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<td class="diff-line-num new new_line" data-linenumber="108" 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">
108
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">waitOpsNonEmpty</span> <span class="n" style="color: #333;">ops</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num new new_line" data-linenumber="109" 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">
109
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HNonEmptyInst</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="n" style="color: #333;">register</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">PZero</span> <span class="n" style="color: #333;">ops</span></span>
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114
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110
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"></span>
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115
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111
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"><span class="n" style="color: #333;">bug</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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116
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"><span class="n" style="color: #333;">bug</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#ab28f67deb9ac491af24c0fde6ee70d7b8c486db"><strong>testsuite/tests/typecheck/should_fail/T15862.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T15862.hs:17:7: error:</span>
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3
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • No instance for (Typeable 'MkFoo) arising from a use of ‘typeRep’</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> GHC can't yet do polykinded</span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> Typeable ('MkFoo :: (forall a. a) -> Foo)</span>
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6
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> • In the expression: typeRep @MkFoo</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> In an equation for ‘foo’: foo = typeRep @MkFoo</span>
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8
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">T15862.hs:25:7: error:</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> • No instance for (Typeable 'MkBar) arising from a use of ‘typeRep’</span>
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11
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> GHC can't yet do polykinded Typeable ('MkBar :: Bool -> Bar)</span>
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12
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> • In the expression: typeRep</span>
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13
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> In an equation for ‘bar’: bar = typeRep</span>
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14
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext">T15862.hs:30:8: error:</span>
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16
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext"> • No instance for (Typeable 'MkQuux)</span>
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17
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext"> arising from a use of ‘typeRep’</span>
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18
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext"> GHC can't yet do polykinded</span>
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19
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"> Typeable ('MkQuux :: (# Bool | Int #) -> Quux)</span>
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20
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext"> • In the expression: typeRep</span>
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21
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext"> In an equation for ‘quux’: quux = typeRep</span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="plaintext">T15862.hs:36:8: error:</span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="plaintext"> • No instance for (Typeable 'MkQuuz)</span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext"> arising from a use of ‘typeRep’</span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="plaintext"> GHC can't yet do polykinded Typeable ('MkQuuz :: Quuz)</span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="plaintext"> • In the expression: typeRep</span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="plaintext"> In an equation for ‘quuz’: quuz = typeRep</span></pre>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T15862.hs:16:16: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Expected kind ‘k0’, but ‘MkFoo’ has kind ‘(forall a. a) -> Foo’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Cannot instantiate unification variable ‘k0’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> with a kind involving polytypes: (forall a. a) -> Foo</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the first argument of ‘TypeRep’, namely ‘MkFoo’</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> In the type signature: foo :: TypeRep MkFoo</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#5fab07a05f110bd2cd1c62c975ecc29a366fd073"><strong>testsuite/tests/typecheck/should_fail/T2846b.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">@@ -3,4 +3,6 @@ module T2846 where</td>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">show</span> <span class="p">([</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">2</span><span class="p">,</span><span class="mi" style="color: #099;">3</span><span class="p">]</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Num</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="haskell"></span></pre>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Rejected with Quick Look</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The arg of 'show' is a naked 'a'</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- And the actual arg has type (forall a. [Num a => a]), which is polymorphic</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#05b60e08254352118b4d1fd7604362a8a77cbb82"><strong>testsuite/tests/typecheck/should_fail/T2846b.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T2846b.hs:5:5: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • No instance for (Show (Num a0 => a0))</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> arising from a use of ‘show’</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> (maybe you haven't applied a function to enough arguments?)</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> • In the expression: show ([1, 2, 3] :: [Num a => a])</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T2846b.hs:5:11: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match expected type ‘a1’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> with actual type ‘[Num a0 => a0]’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> Cannot instantiate unification variable ‘a1’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> with a type involving polytypes: [Num a0 => a0]</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> • In the first argument of ‘show’, namely</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> ‘([1, 2, 3] :: [Num a => a])’</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> In the expression: show ([1, 2, 3] :: [Num a => a])</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> In an equation for ‘f’: f = show ([1, 2, 3] :: [Num a => a])</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#0158b6615005db39bac2e708ca62ed4a319172de"><strong>testsuite/tests/typecheck/should_fail/T3176.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">@@ -2,6 +2,7 @@</td>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T3176.hs:9:27: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Cannot use record selector ‘unES’ as a function due to escaped type variables</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> Probable fix: use pattern-matching syntax instead</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> • In the first argument of ‘($)’, namely ‘unES’</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In the second argument of ‘($)’, namely ‘unES $ f t’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the second argument of ‘($)’, namely ‘unES $ f t’</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> In the expression: show $ unES $ f t</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> In an equation for ‘smallPrintES’:</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> smallPrintES f t = show $ unES $ f t</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#99e9e3cbf5225d3b49621941bc28b97e6a5d32f8"><strong>testsuite/tests/typecheck/should_fail/T6069.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -5,8 +5,8 @@ T6069.hs:13:15: error:</td>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> Expected: ST s0 Int -> b0</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> Actual: (forall s. ST s b0) -> b0</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> • In the second argument of ‘(.)’, namely ‘runST’</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> In the expression: print . runST</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> In the expression: (print . runST) fourty_two</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> In an equation for ‘f1’: f1 = (print . runST) fourty_two</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext">T6069.hs:14:15: error:</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> • Couldn't match type: forall s. ST s b1</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#b166026a124e4ed0cfeb367ad0745c803ab612ff"><strong>testsuite/tests/typecheck/should_fail/T8450.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T8450.hs:8:<span class="idiff left right">20</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T8450.hs:8:<span class="idiff left right">19</span>: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘a’ with ‘Bool’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> Expected: Either Bool ()</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> Actual: Either a ()</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -575,3 +575,4 @@ test('ExplicitSpecificity7', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity8</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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576
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity9</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity10</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">too-many</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#5897532a78b47edda1ef047493c310fa56ca8570"><strong>testsuite/tests/typecheck/should_fail/tcfail140.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">@@ -9,7 +9,7 @@ tcfail140.hs:10:7: error:</td>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">tcfail140.hs:12:10: error:</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> • Couldn't match expected type ‘t1 -> t’ with actual type ‘Int’</span>
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12
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> • The <span class="idiff left right">operator ‘f’ takes</span> two value arguments,</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> • The <span class="idiff left right">function ‘f’ is applied to</span> two value arguments,</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> but its type ‘Int -> Int’ has only one</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> In the expression: 3 `f` 4</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> In an equation for ‘rot’: rot xs = 3 `f` 4</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">@@ -19,7 +19,7 @@ tcfail140.hs:12:10: error:</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext">tcfail140.hs:14:15: error:</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"> • Couldn't match expected type ‘a -> b’ with actual type ‘Int’</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"> • The operator ‘f’ takes two value arguments,</span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="plaintext"> but its type ‘Int -> Int’ has only one</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> <span class="idiff left right"> </span>but its type ‘Int -> Int’ has only one</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"> In the first argument of ‘map’, namely ‘(3 `f`)’</span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"> In the expression: map (3 `f`) xs</span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"> • Relevant bindings include</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#6544261c560cd0344b7a1682b390319089d5b1cb"><strong>testsuite/tests/typecheck/should_fail/tcfail204.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2,7 +2,7 @@</td>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">tcfail204.hs:10:7: error: [-Wtype-defaults (in -Wall), -Werror=type-defaults]</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Defaulting the following constraints to type ‘Double’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> (RealFrac a0)</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> arising from a use of ‘ceiling’ at tcfail204.hs:10:7-1<span class="idiff left right">7</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> arising from a use of ‘ceiling’ at tcfail204.hs:10:7-1<span class="idiff left right">3</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> (Fractional a0)</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> arising from the literal ‘6.3’ at tcfail204.hs:10:15-17</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> • In the expression: ceiling 6.3</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#d3c776c0838cc9e459391d94fa49bcde6ad39746"><strong>testsuite/tests/typecheck/should_fail/too-many.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">TooMany</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">error</span> <span class="s" style="color: #d14;">"urk"</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">f1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">f1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f1</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">g1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foo</span> <span class="p">(</span><span class="n" style="color: #333;">f1</span> <span class="mi" style="color: #099;">2</span> <span class="mi" style="color: #099;">3</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Here is is sensible to report</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- f1 is applied to too many arguments</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">f2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">f2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f2</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">g2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foo</span> <span class="p">(</span><span class="n" style="color: #333;">f2</span> <span class="mi" style="color: #099;">2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Here is is /not/ sensible to report</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- f2 is applied to too many arguments</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#a2cde8b4b5d8e1886ae210726860690c3d8e455e"><strong>testsuite/tests/typecheck/should_fail/too-many.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">too-many.hs:9:11: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘Bool’ with ‘Int -> Bool’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Expected: Int -> Int -> Bool</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> Actual: Int -> Bool</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • Possible cause: ‘f1’ is applied to too many arguments</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> In the first argument of ‘foo’, namely ‘(f1 2 3)’</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> In the expression: foo (f1 2 3)</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> In an equation for ‘g1’: g1 = foo (f1 2 3)</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">too-many.hs:16:11: error:</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> • Couldn't match expected type ‘Int -> Int -> Bool’</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> with actual type ‘Bool’</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> • In the first argument of ‘foo’, namely ‘(f2 2)’</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> In the expression: foo (f2 2)</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> In an equation for ‘g2’: g2 = foo (f2 2)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/372da668e8a570f4ffb0020adb67e8c9fbf3d728#6315bb4bbd562a7f525adef27453d8214232a689"><strong>testsuite/tests/warnings/should_compile/PluralS.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">@@ -8,7 +8,7 @@ PluralS.hs:15:17: warning: [-Wtype-defaults (in -Wall)]</td>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">PluralS.hs:17:24: warning: [-Wtype-defaults (in -Wall)]</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> • Defaulting the following constraints to type ‘Integer’</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> (Show a0) arising from a use of ‘show’ at PluralS.hs:17:24-<span class="idiff left right">31</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> (Show a0) arising from a use of ‘show’ at PluralS.hs:17:24-<span class="idiff left right">27</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> (Num a0) arising from the literal ‘123’ at PluralS.hs:17:29-31</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> • In the expression: show 123</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> In an equation for ‘defaultingNumAndShow’:</span>
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