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<h3>
Simon Peyton Jones pushed to branch wip/T17173
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844">8531783a</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-09T14:33:55+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do eager instantation in terms
This is a first draft of a patch for #17173.
It will need a proper commit message before we are done!
</pre>
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<h4>14 changed files:</h4>
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<li class="file-stats">
<a href="#71fa5eb3ba70e1d3a6181a226c2c227d42f1eb7d">
compiler/GHC/Tc/Gen/Arrow.hs
</a>
</li>
<li class="file-stats">
<a href="#83f745d921da7adb739e81f83e1c07e723e4a789">
compiler/GHC/Tc/Gen/Bind.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="#8dec347fbe40358b852d7b50ace1e4d62b9b6660">
compiler/GHC/Tc/Gen/Expr.hs-boot
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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="#3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9">
compiler/GHC/Tc/Gen/Match.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="#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a">
compiler/GHC/Tc/Module.hs
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<li class="file-stats">
<a href="#5c0a7f8291c984f0fc06f59e7cf10dbecc11598b">
compiler/GHC/Tc/TyCl/PatSyn.hs
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<li class="file-stats">
<a href="#c6e4263ee64c68e57b7525127d98243fce38b1ea">
compiler/GHC/Tc/Utils/Monad.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="#abcf7b1089a70205ab1b496e30391c2e6bc32e27">
testsuite/tests/quantified-constraints/T17458.stderr
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<li class="file-stats">
<a href="#232c624b3aebd964c68b9403ab8e70550e7e4871">
testsuite/tests/typecheck/should_compile/T18005.hs
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<li class="file-stats">
<a href="#0158b6615005db39bac2e708ca62ed4a319172de">
testsuite/tests/typecheck/should_fail/T3176.stderr
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<h4>Changes:</h4>
<li id="71fa5eb3ba70e1d3a6181a226c2c227d42f1eb7d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#71fa5eb3ba70e1d3a6181a226c2c227d42f1eb7d"><strong>compiler/GHC/Tc/Gen/Arrow.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">@@ -91,7 +91,7 @@ tcProc pat cmd exp_ty</td>
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91
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">exp_ty1</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;">matchExpectedAppTy</span> <span class="n" style="color: #333;">exp_ty</span></span>
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92
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">arr_ty</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchExpectedAppTy</span> <span class="n" style="color: #333;">exp_ty1</span></span>
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93
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93
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">cmd_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CmdEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">cmd_arr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arr_ty</span> <span class="p">}</span></span>
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<td class="diff-line-num old old_line" data-linenumber="94" 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">
94
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<pre style="margin: 0;">-<span id="LC94" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">cmd'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left">Pat</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ProcExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkCheckExpType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg_ty</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num new old_line" data-linenumber="95" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">cmd'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left">CheckPat</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ProcExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arg_ty</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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95
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"> <span class="n" style="color: #333;">tcCmdTop</span> <span class="n" style="color: #333;">cmd_env</span> <span class="n" style="color: #333;">cmd</span> <span class="p">(</span><span class="n" style="color: #333;">unitTy</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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96
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">res_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTransCo</span> <span class="n" style="color: #333;">co</span></span>
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<td class="diff-line-num old_line" data-linenumber="97" 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="LC97" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTcAppCo</span> <span class="n" style="color: #333;">co1</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcNomReflCo</span> <span class="n" style="color: #333;">res_ty</span><span class="p">))</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="371" 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="371" 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">@@ -371,7 +371,7 @@ tcArrDoStmt env _ (BodyStmt _ rhs _ _) res_ty thing_inside</td>
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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>
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"><span class="n" style="color: #333;">tcArrDoStmt</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BindStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">rhs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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373
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<pre style="margin: 0;"> <span id="LC373" 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;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_arr_rhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left">Pat</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">StmtCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkCheckExpType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat_ty</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left">CheckPat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">StmtCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat_ty</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcBindStmt</span> <span class="n" style="color: #333;">pat'</span> <span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="p">}</span></span>
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377
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377
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#83f745d921da7adb739e81f83e1c07e723e4a789"><strong>compiler/GHC/Tc/Gen/Bind.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">@@ -1366,7 +1366,7 @@ tcLhs sig_fn no_gen (PatBind { pat_lhs = pat, pat_rhs = grhss })</td>
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1366
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1366
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<pre style="margin: 0;"> <span id="LC1366" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Existentials in pattern bindings]</span></span>
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1367
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<pre style="margin: 0;"> <span id="LC1367" class="line" lang="haskell"> <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">nosig_mbis</span><span class="p">),</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span></span>
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1368
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1368
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<pre style="margin: 0;"> <span id="LC1368" 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;">patMonoBindsCtxt</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1369
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<pre style="margin: 0;">-<span id="LC1369" class="line" lang="haskell"> <span class="n" style="color: #333;">tcInfer<span class="idiff left">NoInst</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">exp_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span></span>
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<pre style="margin: 0;">+<span id="LC1369" class="line" lang="haskell"> <span class="n" style="color: #333;">tcInfer<span class="idiff left">Inst</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">exp_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- The ir_inst field is irrelevant for patterns</span></span></span>
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<pre style="margin: 0;"> <span id="LC1370" class="line" lang="haskell"> <span class="n" style="color: #333;">tcLetPat</span> <span class="n" style="color: #333;">inst_sig_fun</span> <span class="n" style="color: #333;">no_gen</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">exp_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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1371
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<pre style="margin: 0;"> <span id="LC1371" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">lookup_info</span> <span class="n" style="color: #333;">nosig_names</span></span>
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<pre style="margin: 0;"> <span id="LC1372" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#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">@@ -14,14 +14,9 @@</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="cd">-- | Typecheck an expression</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Expr</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">tcPolyExpr</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcMonoExpr</span></span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcMonoExprNC</span></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferSigma</span></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferSigmaNC</span></span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferRho</span></span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferRhoNC</span></span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSyntaxOp</span></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSyntaxOpGen</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcMonoExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcMonoExprNC</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferRho</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferRhoNC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferAppHead</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSyntaxOp</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSyntaxOpGen</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SyntaxOpType</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">synKnownType</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcCheckId</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">@@ -151,25 +146,14 @@ tcMonoExprNC (L loc expr) res_ty</td>
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<pre style="margin: 0;"> <span id="LC146" 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;">loc</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="LC147" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC148" 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="LC154" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferSigma</span><span class="p">,</span> <span class="n" style="color: #333;">tcInferSigmaNC</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;">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;">GhcTcId</span></span>
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<pre style="margin: 0;">-<span id="LC155" 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="LC156" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Infer a *sigma*-type.</span></span>
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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferSigma</span> <span class="n" style="color: #333;">expr</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;">expr</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">tcInferSigmaNC</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferSigmaNC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC160" 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="LC161" 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;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferNoInst</span> <span class="p">(</span><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC162" 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;">loc</span> <span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">sigma</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC163" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRho</span><span class="p">,</span> <span class="n" style="color: #333;">tcInferRhoNC</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;">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;">GhcTcId</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Infer a *rho*-type. The return type is always (shallowly) instantiated.</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRho</span> <span class="n" style="color: #333;">expr</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;">expr</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">tcInferRhoNC</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRhoNC</span> <span class="n" style="color: #333;">expr</span></span>
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169
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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="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferSigmaNC</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topInstantiate</span> <span class="p">(</span><span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span> <span class="n" style="color: #333;">sigma</span></span>
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<pre style="margin: 0;">-<span id="LC171" 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;">mkLHsWrap</span> <span class="n" style="color: #333;">wrap</span> <span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRhoNC</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC154" 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="LC155" 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;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferInst</span> <span class="p">(</span><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC156" 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;">loc</span> <span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC158" 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="LC159" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="281" 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">@@ -281,13 +265,9 @@ tcExpr e@(HsLamCase x matches) res_ty</td>
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"requires"</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"> <span class="n" style="color: #333;">match_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MC</span> <span class="p">{</span> <span class="n" style="color: #333;">mc_what</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CaseAlt</span><span class="p">,</span> <span class="n" style="color: #333;">mc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcBody</span> <span class="p">}</span></span>
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267
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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC284" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprWithTySig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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285
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<pre style="margin: 0;">-<span id="LC285" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getLoc</span> <span class="p">(</span><span class="n" style="color: #333;">hsSigWcType</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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286
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<pre style="margin: 0;">-<span id="LC286" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">sig_info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkNoErrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Avoid error cascade</span></span>
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287
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<pre style="margin: 0;">-<span id="LC287" class="line" lang="haskell"> <span class="n" style="color: #333;">tcUserTypeSig</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">sig_ty</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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288
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<pre style="margin: 0;">-<span id="LC288" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">poly_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcExprSig</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">sig_info</span></span>
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289
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<pre style="margin: 0;">-<span id="LC289" 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;">ExprWithTySig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">expr'</span> <span class="n" style="color: #333;">sig_ty</span></span>
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290
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcWrapResult</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">expr''</span> <span class="n" style="color: #333;">poly_ty</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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268
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprWithTySig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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269
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<pre style="margin: 0;">+<span id="LC269" 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;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">poly_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcExprWithSig</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">hs_ty</span></span>
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270
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcWrapResult</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">expr'</span> <span class="n" style="color: #333;">poly_ty</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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291
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271
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<pre style="margin: 0;"> <span id="LC271" class="line" lang="haskell"></span>
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292
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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293
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273
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Type-checking overloaded labels]</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="332" 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">@@ -352,7 +332,7 @@ tcExpr expr@(OpApp fix arg1 op arg2) res_ty</td>
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352
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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="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">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="n" style="color: #333;">lv</span> <span class="n" style="color: #333;">op_name</span><span class="p">)))</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">op</span></span>
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353
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333
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">op_name</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 class="c1" style="color: #998; font-style: italic;">-- Note [Typing rule for ($)]</span></span>
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354
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334
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<pre style="margin: 0;"> <span id="LC334" 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;">"Application rule"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">op</span><span class="p">)</span></span>
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355
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">arg1'</span><span class="p">,</span> <span class="n" style="color: #333;">arg1_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInfer<span class="idiff left right">Sigma</span></span> <span class="n" style="color: #333;">arg1</span></span>
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335
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">arg1'</span><span class="p">,</span> <span class="n" style="color: #333;">arg1_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInfer<span class="idiff left right">AppHead</span></span> <span class="n" style="color: #333;">arg1</span></span>
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<pre style="margin: 0;"> <span id="LC336" class="line" lang="haskell"></span>
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337
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<pre style="margin: 0;"> <span id="LC337" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"The first argument of ($) takes"</span></span>
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358
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338
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<pre style="margin: 0;"> <span id="LC338" class="line" lang="haskell"> <span class="n" style="color: #333;">orig1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">arg1</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">@@ -413,7 +393,7 @@ tcExpr expr@(OpApp fix arg1 op arg2) res_ty</td>
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413
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393
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<pre style="margin: 0;"> <span id="LC393" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- \ x -> op x expr</span></span>
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414
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394
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"></span>
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415
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">expr</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SectionR</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">arg2</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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416
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<pre style="margin: 0;">-<span id="LC416" 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;">tcInfer<span class="idiff left right">Fun</span></span> <span class="n" style="color: #333;">op</span></span>
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396
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<pre style="margin: 0;">+<span id="LC396" 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;">tcInfer<span class="idiff left right">AppHead</span></span> <span class="n" style="color: #333;">op</span></span>
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417
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397
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<pre style="margin: 0;"> <span id="LC397" 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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418
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398
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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">mk_op_msg</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">fn_orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">op</span><span class="p">))</span> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">op_ty</span></span>
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399
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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wrap_res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubTypeHR</span> <span class="kt" style="color: #458; font-weight: 600;">SectionOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -428,7 +408,7 @@ tcExpr expr@(SectionR x op arg2) res_ty</td>
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428
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408
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #13285</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="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">expr</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</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="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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431
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<pre style="margin: 0;">-<span id="LC431" 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;">tcInfer<span class="idiff left right">Fun</span></span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;">+<span id="LC411" 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;">tcInfer<span class="idiff left right">AppHead</span></span> <span class="n" style="color: #333;">op</span></span>
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432
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412
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Left sections]</span></span>
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433
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413
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">n_reqd_args</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">xopt</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;">PostfixOperators</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span>
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434
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414
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<pre style="margin: 0;"> <span id="LC414" 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="mi" style="color: #099;">2</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">@@ -1009,6 +989,23 @@ tcExpr other _ = pprPanic "tcMonoExpr" (ppr other)</td>
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1009
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989
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<pre style="margin: 0;"> <span id="LC989" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Include ArrForm, ArrApp, which shouldn't appear at all</span></span>
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1010
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990
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<pre style="margin: 0;"> <span id="LC990" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Also HsTcBracketOut, HsQuasiQuoteE</span></span>
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1011
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991
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<pre style="margin: 0;"> <span id="LC991" class="line" lang="haskell"></span>
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992
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<pre style="margin: 0;">+<span id="LC992" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC993" 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="LC994" 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="LC995" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Expression with type signature e::ty</span></span>
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<pre style="margin: 0;">+<span id="LC996" 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="LC997" 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="LC998" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"><span class="n" style="color: #333;">tcExprWithSig</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;">LHsSigWcType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoGhcTc</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span></span>
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1000
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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1001
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<pre style="margin: 0;">+<span id="LC1001" class="line" lang="haskell"><span class="n" style="color: #333;">tcExprWithSig</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">hs_ty</span></span>
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1002
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkNoErrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Avoid error cascade</span></span>
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1003
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<pre style="margin: 0;">+<span id="LC1003" class="line" lang="haskell"> <span class="n" style="color: #333;">tcUserTypeSig</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">hs_ty</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1004
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">poly_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcExprSig</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">sig_info</span></span>
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1005
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<pre style="margin: 0;">+<span id="LC1005" 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;">ExprWithTySig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">expr'</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">,</span> <span class="n" style="color: #333;">poly_ty</span><span class="p">)</span> <span class="p">}</span></span>
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1006
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1007
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getLoc</span> <span class="p">(</span><span class="n" style="color: #333;">hsSigWcType</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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1008
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"></span>
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1009
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<pre style="margin: 0;"> <span id="LC1009" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1013
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1010
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<pre style="margin: 0;"> <span id="LC1010" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1011
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<pre style="margin: 0;"> <span id="LC1011" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1144" 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">@@ -1147,7 +1144,7 @@ tcApp _m_herald (L loc (HsVar _ (L _ fun_id))) args res_ty</td>
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1147
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1144
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<pre style="margin: 0;"> <span id="LC1144" class="line" lang="haskell"> <span class="n" style="color: #333;">n_val_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isHsValArg</span> <span class="n" style="color: #333;">args</span></span>
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1148
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1145
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<pre style="margin: 0;"> <span id="LC1145" class="line" lang="haskell"></span>
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1149
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1146
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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell"><span class="n" style="color: #333;">tcApp</span> <span class="n" style="color: #333;">m_herald</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">res_ty</span></span>
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1150
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<pre style="margin: 0;">-<span id="LC1150" 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_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInfer<span class="idiff left right">Fun</span></span> <span class="n" style="color: #333;">fun</span></span>
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1147
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<pre style="margin: 0;">+<span id="LC1147" 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_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInfer<span class="idiff left right">AppHead</span></span> <span class="n" style="color: #333;">fun</span></span>
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1148
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<pre style="margin: 0;"> <span id="LC1148" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcFunApp</span> <span class="n" style="color: #333;">m_herald</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">tc_fun</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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1149
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<pre style="margin: 0;"> <span id="LC1149" class="line" lang="haskell"></span>
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1150
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<pre style="margin: 0;"> <span id="LC1150" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1198" 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="1195" 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">@@ -1198,23 +1195,27 @@ mk_op_msg :: LHsExpr GhcRn -> SDoc</td>
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1198
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1195
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<pre style="margin: 0;"> <span id="LC1195" class="line" lang="haskell"><span class="n" style="color: #333;">mk_op_msg</span> <span class="n" style="color: #333;">op</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"The operator"</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;">op</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"takes"</span></span>
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1199
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1196
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<pre style="margin: 0;"> <span id="LC1196" class="line" lang="haskell"></span>
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1200
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1197
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<pre style="margin: 0;"> <span id="LC1197" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------</span></span>
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1201
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<pre style="margin: 0;">-<span id="LC1201" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferFun</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;">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;">GhcTcId</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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1202
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<pre style="margin: 0;">-<span id="LC1202" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Infer type of a function</span></span>
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1203
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<pre style="margin: 0;">-<span id="LC1203" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferFun</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">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;">name</span><span class="p">)))</span></span>
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1204
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<pre style="margin: 0;">-<span id="LC1204" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">fun</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">tcInferId</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1205" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't wrap a context around a plain Id</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;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">fun</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1207" class="line" lang="haskell"></span>
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1208
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<pre style="margin: 0;">-<span id="LC1208" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferFun</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">f</span><span class="p">))</span></span>
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1209
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<pre style="margin: 0;">-<span id="LC1209" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">fun</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">tcInferRecSelId</span> <span class="n" style="color: #333;">f</span><span class="p">)</span></span>
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1210
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<pre style="margin: 0;">-<span id="LC1210" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't wrap a context around a plain Id</span></span>
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1211
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<pre style="margin: 0;">-<span id="LC1211" 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;">loc</span> <span class="n" style="color: #333;">fun</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">}</span></span>
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1212
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<pre style="margin: 0;">-<span id="LC1212" class="line" lang="haskell"></span>
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1213
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<pre style="margin: 0;">-<span id="LC1213" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferFun</span> <span class="n" style="color: #333;">fun</span></span>
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1214
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<pre style="margin: 0;">-<span id="LC1214" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInferSigma</span> <span class="n" style="color: #333;">fun</span></span>
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1215
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<pre style="margin: 0;">-<span id="LC1215" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: tcInferSigma; see GHC.Tc.Utils.Unify</span></span>
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1216
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<pre style="margin: 0;">-<span id="LC1216" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Deep instantiation of InferResult] in GHC.Tc.Utils.Unify</span></span>
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1198
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<pre style="margin: 0;">+<span id="LC1198" 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;">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;">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;">GhcTcId</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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1199
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<pre style="margin: 0;">+<span id="LC1199" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Infer type of the head of an application,</span></span>
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1200
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<pre style="margin: 0;">+<span id="LC1200" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- i.e. the 'f' in (f e1 ... en)</span></span>
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1201
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<pre style="margin: 0;">+<span id="LC1201" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We get back a SigmaType because we have special cases for</span></span>
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1202
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<pre style="margin: 0;">+<span id="LC1202" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * A bare identifier (just look it up)</span></span>
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1203
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<pre style="margin: 0;">+<span id="LC1203" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This case also covers a record selectro HsRecFld</span></span>
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1204
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<pre style="margin: 0;">+<span id="LC1204" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * An expression with a type signature (e :: ty)</span></span>
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1205
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<pre style="margin: 0;">+<span id="LC1205" class="line" lang="haskell"></span>
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1206
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<pre style="margin: 0;">+<span id="LC1206" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">el</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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1207
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<pre style="margin: 0;">+<span id="LC1207" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">e</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1208
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<pre style="margin: 0;">+<span id="LC1208" 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="n" style="color: #333;">add_loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcInferId</span> <span class="n" style="color: #333;">nm</span></span>
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1209
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<pre style="margin: 0;">+<span id="LC1209" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">add_loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcInferRecSelId</span> <span class="n" style="color: #333;">f</span></span>
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1210
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<pre style="margin: 0;">+<span id="LC1210" 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 class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">add_loc_ctxt</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcExprWithSig</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">hs_ty</span></span>
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1211
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<pre style="margin: 0;">+<span id="LC1211" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">add_loc_ctxt</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcInferInst</span> <span class="p">(</span><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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1212
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<pre style="margin: 0;">+<span id="LC1212" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1213
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<pre style="margin: 0;">+<span id="LC1213" class="line" lang="haskell"> <span class="n" style="color: #333;">add_loc_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;">el</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1214
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<pre style="margin: 0;">+<span id="LC1214" class="line" lang="haskell"> <span class="n" style="color: #333;">add_loc</span> <span class="n" style="color: #333;">thing</span></span>
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1217
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1215
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<pre style="margin: 0;"> <span id="LC1215" class="line" lang="haskell"></span>
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1216
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<pre style="margin: 0;">+<span id="LC1216" class="line" lang="haskell"> <span class="n" style="color: #333;">add_loc</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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1217
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<pre style="margin: 0;">+<span id="LC1217" 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;">e'</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing</span></span>
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1218
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<pre style="margin: 0;">+<span id="LC1218" 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;">loc</span> <span class="n" style="color: #333;">e'</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">}</span></span>
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1218
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1219
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<pre style="margin: 0;"> <span id="LC1219" class="line" lang="haskell"></span>
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1219
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1220
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<pre style="margin: 0;"> <span id="LC1220" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------</span></span>
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1220
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1221
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<pre style="margin: 0;"> <span id="LC1221" class="line" lang="haskell"><span class="cd">-- | Type-check the arguments to a function, possibly including visible type</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1431" 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="1432" 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">@@ -1431,7 +1432,7 @@ tcSyntaxOpGen :: CtOrigin</td>
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1432
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<pre style="margin: 0;"> <span id="LC1432" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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1432
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1433
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<pre style="margin: 0;"> <span id="LC1433" 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="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SyntaxExprTc</span><span class="p">)</span></span>
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1433
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1434
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<pre style="margin: 0;"> <span id="LC1434" class="line" lang="haskell"><span class="n" style="color: #333;">tcSyntaxOpGen</span> <span class="n" style="color: #333;">orig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SyntaxExprRn</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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1434
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<pre style="margin: 0;">-<span id="LC1434" 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;">expr</span><span class="p">,</span> <span class="n" style="color: #333;">sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInfer<span class="idiff left right">Sigma</span></span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">noLoc</span> <span class="n" style="color: #333;">op</span></span>
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1435
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<pre style="margin: 0;">+<span id="LC1435" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">expr</span><span class="p">,</span> <span class="n" style="color: #333;">sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInfer<span class="idiff left right">AppHead</span></span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">noLoc</span> <span class="n" style="color: #333;">op</span></span>
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1435
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1436
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<pre style="margin: 0;"> <span id="LC1436" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcSyntaxOpGen"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">op</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sigma</span><span class="p">)</span></span>
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1437
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<pre style="margin: 0;"> <span id="LC1437" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="n" style="color: #333;">expr_wrap</span><span class="p">,</span> <span class="n" style="color: #333;">arg_wraps</span><span class="p">,</span> <span class="n" style="color: #333;">res_wrap</span><span class="p">)</span></span>
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1437
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1438
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<pre style="margin: 0;"> <span id="LC1438" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSynArgA</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">sigma</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1711,7 +1712,7 @@ tcCheckId name res_ty</td>
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1711
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1712
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<pre style="margin: 0;"> <span id="LC1712" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcCheckId"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">actual_res_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res_ty</span><span class="p">])</span></span>
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1712
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1713
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<pre style="margin: 0;"> <span id="LC1713" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">addFunResCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="n" style="color: #333;">name</span><span class="p">))</span> <span class="n" style="color: #333;">actual_res_ty</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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1713
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1714
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<pre style="margin: 0;"> <span id="LC1714" class="line" lang="haskell"> <span class="n" style="color: #333;">tcWrapResultO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OccurrenceOf</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <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;">name</span><span class="p">))</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC1714" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">actual_res_ty</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1715" class="line" lang="haskell"> <span class="n" style="color: #333;">actual_res_ty</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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1716
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<pre style="margin: 0;"> <span id="LC1716" class="line" lang="haskell"></span>
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1717
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<pre style="margin: 0;"> <span id="LC1717" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckRecSelId</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;">AmbiguousFieldOcc</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;">GhcTcId</span><span class="p">)</span></span>
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1717
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1718
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<pre style="margin: 0;"> <span id="LC1718" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckRecSelId</span> <span class="n" style="color: #333;">rn_expr</span> <span class="n" style="color: #333;">f</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unambiguous</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;">lbl</span><span class="p">))</span> <span class="n" style="color: #333;">res_ty</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#8dec347fbe40358b852d7b50ace1e4d62b9b6660"><strong>compiler/GHC/Tc/Gen/Expr.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">@@ -6,23 +6,15 @@ import GHC.Tc.Types ( TcM )</td>
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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.Origin</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</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.Extension</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="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;">tcPolyExpr</span> <span class="o" style="font-weight: 600;">::</span></span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="haskell"> <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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<pre style="margin: 0;">-<span id="LC11" 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="LC12" 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;">GhcTcId</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC13" 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;">tcMonoExpr</span><span class="p">,</span> <span class="n" style="color: #333;">tcMonoExprNC</span> <span class="o" style="font-weight: 600;">::</span></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="haskell"> <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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<pre style="margin: 0;">-<span id="LC16" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span></span>
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<pre style="margin: 0;">-<span id="LC17" 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;">GhcTcId</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferSigma</span> <span class="o" style="font-weight: 600;">::</span></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <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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<pre style="margin: 0;">-<span id="LC21" 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;">GhcTcId</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRho</span><span class="p">,</span> <span class="n" style="color: #333;">tcInferRhoNC</span> <span class="o" style="font-weight: 600;">::</span></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell"> <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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<pre style="margin: 0;">-<span id="LC25" 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;">GhcTcId</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">tcPolyExpr</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;">TcSigmaType</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;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">tcMonoExpr</span><span class="p">,</span> <span class="n" style="color: #333;">tcMonoExprNC</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">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;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC13" 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;">tcInferRho</span><span class="p">,</span> <span class="n" style="color: #333;">tcInferRhoNC</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC17" 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;">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;">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;">GhcTcId</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"><span class="n" style="color: #333;">tcSyntaxOp</span> <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="LC20" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SyntaxExprRn</span></span>
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<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#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">@@ -60,7 +60,7 @@ module GHC.Tc.Gen.HsType (</td>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkClassKindSig</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Pattern type signatures</span></span>
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcHsPatSigType</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">tcPatSig</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcHsPatSigType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Error messages</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">funAppCtxt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addTyConFlavCtxt</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">@@ -75,7 +75,6 @@ import GHC.Tc.Utils.Monad</td>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Origin</span></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Predicate</span></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Constraint</span></span>
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<pre style="margin: 0;">-<span id="LC78" 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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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span></span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Validity</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">@@ -3345,58 +3344,6 @@ tcHsPatSigType ctxt sig_ty</td>
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3345
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<pre style="margin: 0;"> <span id="LC3344" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsPatSigType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsImplicitBndrs</span> <span class="n" style="color: #333;">nec</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtCon</span> <span class="n" style="color: #333;">nec</span></span>
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<pre style="margin: 0;"> <span id="LC3345" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsPatSigType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsWildCardBndrs</span> <span class="n" style="color: #333;">nec</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtCon</span> <span class="n" style="color: #333;">nec</span></span>
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3347
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3346
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<pre style="margin: 0;"> <span id="LC3346" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3348" class="line" lang="haskell"><span class="n" style="color: #333;">tcPatSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <=> pattern binding</span></span>
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3349
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<pre style="margin: 0;">-<span id="LC3349" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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3350
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<pre style="margin: 0;">-<span id="LC3350" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpSigmaType</span></span>
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3351
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<pre style="margin: 0;">-<span id="LC3351" 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;">TcType</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- The type to use for "inside" the signature</span></span>
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3352
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<pre style="margin: 0;">-<span id="LC3352" class="line" lang="haskell"> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)],</span> <span class="c1" style="color: #998; font-style: italic;">-- The new bit of type environment, binding</span></span>
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3353
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<pre style="margin: 0;">-<span id="LC3353" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the scoped type variables</span></span>
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3354
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<pre style="margin: 0;">-<span id="LC3354" class="line" lang="haskell"> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)],</span> <span class="c1" style="color: #998; font-style: italic;">-- The wildcards</span></span>
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3355
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<pre style="margin: 0;">-<span id="LC3355" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Coercion due to unification with actual ty</span></span>
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3356
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<pre style="margin: 0;">-<span id="LC3356" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Of shape: res_ty ~ sig_ty</span></span>
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3357
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<pre style="margin: 0;">-<span id="LC3357" class="line" lang="haskell"><span class="n" style="color: #333;">tcPatSig</span> <span class="n" style="color: #333;">in_pat_bind</span> <span class="n" style="color: #333;">sig</span> <span class="n" style="color: #333;">res_ty</span></span>
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3358
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<pre style="margin: 0;">-<span id="LC3358" 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;">sig_wcs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsPatSigType</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigCtxt</span> <span class="n" style="color: #333;">sig</span></span>
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3359
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<pre style="margin: 0;">-<span id="LC3359" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sig_tvs are the type variables free in 'sig',</span></span>
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3360
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<pre style="margin: 0;">-<span id="LC3360" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and not already in scope. These are the ones</span></span>
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3361
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<pre style="margin: 0;">-<span id="LC3361" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that should be brought into scope</span></span>
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3362
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<pre style="margin: 0;">-<span id="LC3362" class="line" lang="haskell"></span>
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3363
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<pre style="margin: 0;">-<span id="LC3363" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">sig_tvs</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span></span>
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3364
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<pre style="margin: 0;">-<span id="LC3364" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Just do the subsumption check and return</span></span>
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3365
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<pre style="margin: 0;">-<span id="LC3365" class="line" lang="haskell"> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addErrCtxtM</span> <span class="p">(</span><span class="n" style="color: #333;">mk_msg</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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3366
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<pre style="margin: 0;">-<span id="LC3366" class="line" lang="haskell"> <span class="n" style="color: #333;">tcSubTypeET</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigCtxt</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">sig_ty</span></span>
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3367
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<pre style="margin: 0;">-<span id="LC3367" 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;">sig_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">sig_wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wrap</span><span class="p">)</span></span>
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3368
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<pre style="margin: 0;">-<span id="LC3368" class="line" lang="haskell"> <span class="p">}</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span></span>
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3369
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<td class="diff-line-num new_line old" data-linenumber="3347" 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="LC3369" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Type signature binds at least one scoped type variable</span></span>
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3370
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<pre style="margin: 0;">-<span id="LC3370" class="line" lang="haskell"></span>
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3371
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<td class="diff-line-num new_line old" data-linenumber="3347" 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="LC3371" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A pattern binding cannot bind scoped type variables</span></span>
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3372
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<pre style="margin: 0;">-<span id="LC3372" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It is more convenient to make the test here</span></span>
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3373
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<td class="diff-line-num new_line old" data-linenumber="3347" 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="LC3373" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- than in the renamer</span></span>
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3374
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<pre style="margin: 0;">-<span id="LC3374" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">in_pat_bind</span> <span class="p">(</span><span class="n" style="color: #333;">addErr</span> <span class="p">(</span><span class="n" style="color: #333;">patBindSigErr</span> <span class="n" style="color: #333;">sig_tvs</span><span class="p">))</span></span>
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3375
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<pre style="margin: 0;">-<span id="LC3375" class="line" lang="haskell"></span>
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3376
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<pre style="margin: 0;">-<span id="LC3376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now do a subsumption check of the pattern signature against res_ty</span></span>
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3377
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<pre style="margin: 0;">-<span id="LC3377" 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;">addErrCtxtM</span> <span class="p">(</span><span class="n" style="color: #333;">mk_msg</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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3378
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<pre style="margin: 0;">-<span id="LC3378" class="line" lang="haskell"> <span class="n" style="color: #333;">tcSubTypeET</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigCtxt</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">sig_ty</span></span>
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3379
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<pre style="margin: 0;">-<span id="LC3379" class="line" lang="haskell"></span>
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3380
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<pre style="margin: 0;">-<span id="LC3380" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Phew!</span></span>
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3381
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<pre style="margin: 0;">-<span id="LC3381" 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;">sig_ty</span><span class="p">,</span> <span class="n" style="color: #333;">sig_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wrap</span><span class="p">)</span></span>
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3382
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<pre style="margin: 0;">-<span id="LC3382" class="line" lang="haskell"> <span class="p">}</span> <span class="p">}</span></span>
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3383
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<pre style="margin: 0;">-<span id="LC3383" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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3384
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<pre style="margin: 0;">-<span id="LC3384" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_msg</span> <span class="n" style="color: #333;">sig_ty</span> <span class="n" style="color: #333;">tidy_env</span></span>
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3385
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<pre style="margin: 0;">-<span id="LC3385" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tidy_env</span><span class="p">,</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTidyTcType</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">sig_ty</span></span>
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3386
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<pre style="margin: 0;">-<span id="LC3386" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">res_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- should be filled in by now</span></span>
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<td class="diff-line-num old old_line" data-linenumber="3387" 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">
3387
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<pre style="margin: 0;">-<span id="LC3387" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tidy_env</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTidyTcType</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">res_ty</span></span>
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3388
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<pre style="margin: 0;">-<span id="LC3388" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">=</span> <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;">text</span> <span class="s" style="color: #d14;">"When checking that the pattern signature:"</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC3389" class="line" lang="haskell"> <span class="mi" style="color: #099;">4</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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3390
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<pre style="margin: 0;">-<span id="LC3390" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nest</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</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;">"fits the type of its context:"</span><span class="p">)</span></span>
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3391
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<pre style="margin: 0;">-<span id="LC3391" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res_ty</span><span class="p">))</span> <span class="p">]</span></span>
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3392
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<pre style="margin: 0;">-<span id="LC3392" 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;">tidy_env</span><span class="p">,</span> <span class="n" style="color: #333;">msg</span><span class="p">)</span> <span class="p">}</span></span>
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3393
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<pre style="margin: 0;">-<span id="LC3393" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3394" class="line" lang="haskell"><span class="n" style="color: #333;">patBindSigErr</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</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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3395
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<pre style="margin: 0;">-<span id="LC3395" class="line" lang="haskell"><span class="n" style="color: #333;">patBindSigErr</span> <span class="n" style="color: #333;">sig_tvs</span></span>
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3396
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<pre style="margin: 0;">-<span id="LC3396" class="line" lang="haskell"> <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;">"You cannot bind scoped type variable"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">plural</span> <span class="n" style="color: #333;">sig_tvs</span></span>
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3397
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<pre style="margin: 0;">-<span id="LC3397" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprQuotedList</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">sig_tvs</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC3398" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"in a pattern binding signature"</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC3399" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Pattern signature binders]</span></span>
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<pre style="margin: 0;"> <span id="LC3348" 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="LC3349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Type variables in the type environment] in GHC.Tc.Utils.</span></span>
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<li id="3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9"><strong>compiler/GHC/Tc/Gen/Match.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -422,8 +422,8 @@ tcGuardStmt _ (BodyStmt _ guard _ _) res_ty thing_inside</td>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="haskell"><span class="n" style="color: #333;">tcGuardStmt</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BindStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">rhs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC423" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_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;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC424" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Stmt has a context already</span></span>
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<pre style="margin: 0;">-<span id="LC425" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcPat_O</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC426" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">pat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkCheckExpType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rhs_ty</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left right">Check</span>Pat_O</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC426" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">pat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhs_ty</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcBindStmt</span> <span class="n" style="color: #333;">pat'</span> <span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="p">}</span></span>
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429
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="456" 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">@@ -456,7 +456,7 @@ tcLcStmt _ _ (LastStmt x body noret _) elt_ty thing_inside</td>
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456
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456
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell"><span class="n" style="color: #333;">tcLcStmt</span> <span class="n" style="color: #333;">m_tc</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BindStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">rhs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">elt_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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457
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457
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">pat_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newFlexiTyVarTy</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
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458
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458
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcMonoExpr</span> <span class="n" style="color: #333;">rhs</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">m_tc</span> <span class="p">[</span><span class="n" style="color: #333;">pat_ty</span><span class="p">])</span></span>
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459
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<pre style="margin: 0;">-<span id="LC459" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left">Pat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">StmtCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkCheckExpType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat_ty</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left">CheckPat</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">StmtCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat_ty</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">elt_ty</span></span>
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461
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<pre style="margin: 0;"> <span id="LC461" 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;">mkTcBindStmt</span> <span class="n" style="color: #333;">pat'</span> <span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="p">}</span></span>
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462
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462
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="580" 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">@@ -580,8 +580,7 @@ tcMcStmt ctxt (BindStmt _ pat rhs bind_op fail_op) res_ty thing_inside</td>
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580
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580
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SynRho</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SynFun</span> <span class="kt" style="color: #458; font-weight: 600;">SynAny</span> <span class="kt" style="color: #458; font-weight: 600;">SynRho</span><span class="p">]</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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581
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581
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="p">[</span><span class="n" style="color: #333;">rhs_ty</span><span class="p">,</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">,</span> <span class="n" style="color: #333;">new_res_ty</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span></span>
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582
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582
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcMonoExprNC</span> <span class="n" style="color: #333;">rhs</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC583" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="n" style="color: #333;">pat</span></span>
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<pre style="margin: 0;">-<span id="LC584" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCheckPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">pat_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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585
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">new_res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC585" 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;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">,</span> <span class="n" style="color: #333;">new_res_ty</span><span class="p">)</span> <span class="p">}</span></span>
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586
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<pre style="margin: 0;"> <span id="LC586" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="839" 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">@@ -840,8 +839,7 @@ tcDoStmt ctxt (BindStmt _ pat rhs bind_op fail_op) res_ty thing_inside</td>
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840
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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;">tcSyntaxOp</span> <span class="kt" style="color: #458; font-weight: 600;">DoOrigin</span> <span class="n" style="color: #333;">bind_op</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SynRho</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SynFun</span> <span class="kt" style="color: #458; font-weight: 600;">SynAny</span> <span class="kt" style="color: #458; font-weight: 600;">SynRho</span><span class="p">]</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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841
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840
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="p">[</span><span class="n" style="color: #333;">rhs_ty</span><span class="p">,</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">,</span> <span class="n" style="color: #333;">new_res_ty</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span></span>
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842
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841
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcMonoExprNC</span> <span class="n" style="color: #333;">rhs</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span></span>
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843
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<pre style="margin: 0;">-<span id="LC843" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="n" style="color: #333;">pat</span></span>
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844
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<pre style="margin: 0;">-<span id="LC844" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">pat_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="LC842" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCheckPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">pat_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">new_res_ty</span><span class="p">)</span></span>
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846
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844
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<pre style="margin: 0;"> <span id="LC844" 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;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">new_res_ty</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="p">}</span></span>
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845
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1038" 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="1036" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1038,7 +1036,7 @@ tcApplicativeStmts ctxt pairs rhs_ty thing_inside</td>
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1038
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="p">(</span><span class="n" style="color: #333;">combineSrcSpans</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">pat</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">rhs</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>
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1039
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1037
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">pprStmtInCtxt</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="n" style="color: #333;">mkBindStmt</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">rhs</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcMonoExprNC</span> <span class="n" style="color: #333;">rhs</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">exp_ty</span><span class="p">)</span></span>
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1041
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<pre style="margin: 0;">-<span id="LC1041" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left">Pat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">StmtCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkCheckExpType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat_ty</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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1039
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<pre style="margin: 0;">+<span id="LC1039" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left">CheckPat</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">StmtCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat_ty</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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1042
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1040
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1043
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">fail_op'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcMonadFailOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DoPatOrigin</span> <span class="n" style="color: #333;">pat</span><span class="p">)</span> <span class="n" style="color: #333;">pat'</span> <span class="n" style="color: #333;">fail_op</span> <span class="n" style="color: #333;">body_ty</span></span>
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1044
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1054" 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="1052" 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">@@ -1054,7 +1052,7 @@ tcApplicativeStmts ctxt pairs rhs_ty thing_inside</td>
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1054
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1052
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<pre style="margin: 0;"> <span id="LC1052" class="line" lang="haskell"> <span class="n" style="color: #333;">tcStmtsAndThen</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">tcDoStmt</span> <span class="n" style="color: #333;">stmts</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">exp_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1055
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1053
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<pre style="margin: 0;"> <span id="LC1053" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1056
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1054
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<pre style="margin: 0;"> <span id="LC1054" class="line" lang="haskell"> <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;">ret'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcMonoExprNC</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="n" style="color: #333;">ret</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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1057
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<pre style="margin: 0;">-<span id="LC1057" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left">Pat</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">StmtCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkCheckExpType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat_ty</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc<span class="idiff left">CheckPat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">StmtCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat_ty</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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1058
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1056
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<pre style="margin: 0;"> <span id="LC1056" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1059
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1057
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<pre style="margin: 0;"> <span id="LC1057" 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;">ret'</span><span class="p">,</span> <span class="n" style="color: #333;">pat'</span><span class="p">)</span></span>
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1060
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1058
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<pre style="margin: 0;"> <span id="LC1058" class="line" lang="haskell"> <span class="p">}</span></span>
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<li id="3ee8be814b6c6727880deab3772e6af922524bf0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#3ee8be814b6c6727880deab3772e6af922524bf0"><strong>compiler/GHC/Tc/Gen/Pat.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -16,8 +16,7 @@ module GHC.Tc.Gen.Pat</td>
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16
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16
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">tcLetPat</span></span>
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17
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17
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newLetBndr</span></span>
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18
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18
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LetBndrSpec</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcPat</span></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcPat_O</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcCheckPat</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcCheckPat_O</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferPat</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcPats</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addDataConStupidTheta</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">badFieldCon</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">@@ -29,7 +28,7 @@ where</td>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GhcPrelude</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Tc</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Gen</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span><span class="p">(</span> <span class="n" style="color: #333;">tcSyntaxOp</span><span class="p">,</span> <span class="n" style="color: #333;">tcSyntaxOpGen</span><span class="p">,</span> <span class="n" style="color: #333;">tcInfer<span class="idiff left right">Sigma</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Tc</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Gen</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span><span class="p">(</span> <span class="n" style="color: #333;">tcSyntaxOp</span><span class="p">,</span> <span class="n" style="color: #333;">tcSyntaxOpGen</span><span class="p">,</span> <span class="n" style="color: #333;">tcInfer<span class="idiff left right">AppHead</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Zonk</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">@@ -63,6 +62,7 @@ import Util</td>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Arrow</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">second</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">when</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ListSetOps</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">getNth</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -112,20 +112,29 @@ tcPats ctxt pats pat_tys thing_inside</td>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"> <span class="n" style="color: #333;">penv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PE</span> <span class="p">{</span> <span class="n" style="color: #333;">pe_lazy</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">pe_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LamPat</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">pe_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PatOrigin</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC115" class="line" lang="haskell"><span class="n" style="color: #333;">tcPat</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">-<span id="LC116" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</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;">ExpSigmaType</span></span>
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<pre style="margin: 0;">-<span id="LC117" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- Checker for body</span></span>
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<pre style="margin: 0;">-<span id="LC118" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC119" class="line" lang="haskell"><span class="n" style="color: #333;">tcPat</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcPat_O</span> <span class="n" style="color: #333;">ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">PatOrigin</span></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferPat</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</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;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC117" 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;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferPat</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInferInst</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">exp_ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="c1" style="color: #998; font-style: italic;">-- The ir_inst flag is irrelevant in tcPat</span></span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_lpat</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">exp_ty</span> <span class="n" style="color: #333;">penv</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"> <span class="n" style="color: #333;">penv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PE</span> <span class="p">{</span> <span class="n" style="color: #333;">pe_lazy</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">pe_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LamPat</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">pe_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PatOrigin</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckPat</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- Checker for body</span></span>
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<pre style="margin: 0;">+<span id="LC127" 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;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckPat</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcCheckPat_O</span> <span class="n" style="color: #333;">ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">PatOrigin</span></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"><span class="cd">-- | A variant of 'tcPat' that takes a custom origin</span></span>
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<pre style="margin: 0;">-<span id="LC122" class="line" lang="haskell"><span class="n" style="color: #333;">tcPat_O</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">-<span id="LC123" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ origin to use if the type needs inst'ing</span></span>
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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LPat</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Exp</span>SigmaType</span></span>
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- Checker for body</span></span>
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<pre style="margin: 0;">-<span id="LC126" 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;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC127" class="line" lang="haskell"><span class="n" style="color: #333;">tcPat_O</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">pat_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">-<span id="LC128" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_lpat</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;"><span class="idiff left right">pat_ty</span></span> <span class="n" style="color: #333;">penv</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"><span class="n" style="color: #333;">tc<span class="idiff left right">Check</span>Pat_O</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ origin to use if the type needs inst'ing</span></span>
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LPat</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Tc</span>SigmaType</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- Checker for body</span></span>
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTcId</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"><span class="n" style="color: #333;">tc<span class="idiff left right">Check</span>Pat_O</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">pat_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_lpat</span> <span class="n" style="color: #333;">pat</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkCheckExpType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat_ty</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">penv</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"> <span class="n" style="color: #333;">penv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PE</span> <span class="p">{</span> <span class="n" style="color: #333;">pe_lazy</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">pe_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LamPat</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">pe_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">orig</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC140" 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">@@ -390,22 +399,25 @@ tc_pat penv (AsPat x (L nm_loc name) pat) pat_ty thing_inside</td>
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399
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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell"></span>
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391
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<pre style="margin: 0;"> <span id="LC400" class="line" lang="haskell"><span class="n" style="color: #333;">tc_pat</span> <span class="n" style="color: #333;">penv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ViewPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">pat</span><span class="p">)</span> <span class="n" style="color: #333;">overall_pat_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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392
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<pre style="margin: 0;"> <span id="LC401" 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>
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Expr must have type `forall a1...aN. OPT' -> B`</span></span>
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<pre style="margin: 0;">-<span id="LC394" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where overall_pat_ty is an instance of OPT'.</span></span>
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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">expr'</span><span class="p">,</span><span class="n" style="color: #333;">expr'_inferred</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferSigma</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC397" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expression must be a function</span></span>
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<pre style="margin: 0;">+<span id="LC402" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Using tcInferAppHead here, rather than tcMonoExpr, lets us</span></span>
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- have view functions with types like:</span></span>
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (forall a. blah) -> forall b. burble</span></span>
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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- So the overall_pat_ty is (forall a. blah), while the</span></span>
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inner pattern is checked with (forall b. burble)</span></span>
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">expr'</span><span class="p">,</span><span class="n" style="color: #333;">expr_ty</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;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC408" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Expression must be a function</span></span>
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<pre style="margin: 0;"> <span id="LC410" 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="LC411" 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="LC412" 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="LC401" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys</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;">unLoc</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<span class="idiff left right">'_inferred</span></span></span>
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expr_wrap1 :: expr<span class="idiff left right">'_inferred</span> "->" (inf_arg_ty -> inf_res_ty)</span></span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTys</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;">unLoc</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<span class="idiff left right">_ty</span></span></span>
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expr_wrap1 :: expr<span class="idiff left right">_ty</span> "->" (inf_arg_ty -> inf_res_ty)</span></span>
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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">c</span>heck that overall pattern is more polymorphic than arg type</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;">-- <span class="idiff left right">C</span>heck that overall pattern is more polymorphic than arg type</span></span>
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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">expr_wrap2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubTypePat</span> <span class="n" style="color: #333;">penv</span> <span class="n" style="color: #333;">overall_pat_ty</span> <span class="n" style="color: #333;">inf_arg_ty</span></span>
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406
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<pre style="margin: 0;"> <span id="LC418" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expr_wrap2 :: overall_pat_ty "->" inf_arg_ty</span></span>
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<pre style="margin: 0;"> <span id="LC419" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">p</span>attern must have inf_res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC420" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">P</span>attern must have inf_res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_lpat</span> <span class="n" style="color: #333;">pat</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">inf_res_ty</span><span class="p">)</span> <span class="n" style="color: #333;">penv</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC423" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">overall_pat_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">overall_pat_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">@@ -665,6 +677,66 @@ because they won't be in scope when we do the desugaring</td>
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<pre style="margin: 0;"> <span id="LC677" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC678" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC679" 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="LC680" 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="LC681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Pattern signatures (pat :: type)</span></span>
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<pre style="margin: 0;">+<span id="LC682" 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="LC683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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684
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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685
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"><span class="n" style="color: #333;">tcPatSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <=> pattern binding</span></span>
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687
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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688
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpSigmaType</span></span>
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689
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- The type to use for "inside" the signature</span></span>
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690
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)],</span> <span class="c1" style="color: #998; font-style: italic;">-- The new bit of type environment, binding</span></span>
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691
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the scoped type variables</span></span>
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692
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)],</span> <span class="c1" style="color: #998; font-style: italic;">-- The wildcards</span></span>
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693
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Coercion due to unification with actual ty</span></span>
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Of shape: res_ty ~ sig_ty</span></span>
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"><span class="n" style="color: #333;">tcPatSig</span> <span class="n" style="color: #333;">in_pat_bind</span> <span class="n" style="color: #333;">sig</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC696" 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;">sig_wcs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsPatSigType</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigCtxt</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sig_tvs are the type variables free in 'sig',</span></span>
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698
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and not already in scope. These are the ones</span></span>
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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that should be brought into scope</span></span>
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700
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell"></span>
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701
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<pre style="margin: 0;">+<span id="LC701" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">sig_tvs</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span></span>
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702
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<pre style="margin: 0;">+<span id="LC702" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Just do the subsumption check and return</span></span>
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703
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addErrCtxtM</span> <span class="p">(</span><span class="n" style="color: #333;">mk_msg</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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704
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"> <span class="n" style="color: #333;">tcSubTypeET</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigCtxt</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">sig_ty</span></span>
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705
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<pre style="margin: 0;">+<span id="LC705" 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;">sig_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">sig_wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wrap</span><span class="p">)</span></span>
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706
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<pre style="margin: 0;">+<span id="LC706" class="line" lang="haskell"> <span class="p">}</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span></span>
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707
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<pre style="margin: 0;">+<span id="LC707" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Type signature binds at least one scoped type variable</span></span>
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708
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"></span>
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709
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A pattern binding cannot bind scoped type variables</span></span>
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710
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<pre style="margin: 0;">+<span id="LC710" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It is more convenient to make the test here</span></span>
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711
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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- than in the renamer</span></span>
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712
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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">in_pat_bind</span> <span class="p">(</span><span class="n" style="color: #333;">addErr</span> <span class="p">(</span><span class="n" style="color: #333;">patBindSigErr</span> <span class="n" style="color: #333;">sig_tvs</span><span class="p">))</span></span>
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713
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now do a subsumption check of the pattern signature against res_ty</span></span>
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715
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addErrCtxtM</span> <span class="p">(</span><span class="n" style="color: #333;">mk_msg</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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716
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"> <span class="n" style="color: #333;">tcSubTypeET</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigCtxt</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">sig_ty</span></span>
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717
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"></span>
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718
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Phew!</span></span>
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719
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">sig_ty</span><span class="p">,</span> <span class="n" style="color: #333;">sig_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wrap</span><span class="p">)</span></span>
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720
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"> <span class="p">}</span> <span class="p">}</span></span>
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721
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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722
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_msg</span> <span class="n" style="color: #333;">sig_ty</span> <span class="n" style="color: #333;">tidy_env</span></span>
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723
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tidy_env</span><span class="p">,</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTidyTcType</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">sig_ty</span></span>
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724
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<pre style="margin: 0;">+<span id="LC724" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">res_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- should be filled in by now</span></span>
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725
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tidy_env</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTidyTcType</span> <span class="n" style="color: #333;">tidy_env</span> <span class="n" style="color: #333;">res_ty</span></span>
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726
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<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">=</span> <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;">text</span> <span class="s" style="color: #d14;">"When checking that the pattern signature:"</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"> <span class="mi" style="color: #099;">4</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nest</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</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;">"fits the type of its context:"</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC729" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res_ty</span><span class="p">))</span> <span class="p">]</span></span>
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730
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">tidy_env</span><span class="p">,</span> <span class="n" style="color: #333;">msg</span><span class="p">)</span> <span class="p">}</span></span>
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731
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<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell"></span>
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732
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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"><span class="n" style="color: #333;">patBindSigErr</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"><span class="n" style="color: #333;">patBindSigErr</span> <span class="n" style="color: #333;">sig_tvs</span></span>
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734
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"You cannot bind scoped type variable"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">plural</span> <span class="n" style="color: #333;">sig_tvs</span></span>
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735
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprQuotedList</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">sig_tvs</span><span class="p">))</span></span>
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736
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"in a pattern binding signature"</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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740
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<pre style="margin: 0;"> <span id="LC740" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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669
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741
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<pre style="margin: 0;"> <span id="LC741" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Most of the work for constructors is here</span></span>
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670
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742
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<pre style="margin: 0;"> <span id="LC742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (the rest is in the ConPatIn case of tc_pat)</span></span>
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<li id="e65390fa5a32c453a81a1c9a3e1c4464d155ca4a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a"><strong>compiler/GHC/Tc/Module.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">@@ -56,7 +56,6 @@ import GHC.Iface.Env ( externaliseName )</td>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.HsType</span></span>
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57
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Validity</span><span class="p">(</span> <span class="n" style="color: #333;">checkValidType</span> <span class="p">)</span></span>
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58
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Match</span></span>
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59
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span><span class="p">(</span> <span class="n" style="color: #333;">deeplyInstantiate</span> <span class="p">)</span></span>
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60
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span><span class="p">(</span> <span class="n" style="color: #333;">checkConstraints</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.HsType</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Expr</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">@@ -2492,15 +2491,12 @@ tcRnExpr hsc_env mode rdr_expr</td>
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<pre style="margin: 0;"> <span id="LC2491" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now typecheck the expression, and generalise its type</span></span>
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<pre style="margin: 0;"> <span id="LC2492" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it might have a rank-2 type (e.g. :t runST)</span></span>
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<pre style="margin: 0;"> <span id="LC2493" class="line" lang="haskell"> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newUnique</span> <span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC2495" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">{</span> <span class="n" style="color: #333;">fresh_it</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">itName</span> <span class="n" style="color: #333;">uniq</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">rdr_expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2496" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">rn_expr</span> <span class="p">}</span> <span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC2494" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">{</span> <span class="n" style="color: #333;">fresh_it</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">itName</span> <span class="n" style="color: #333;">uniq</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">rdr_expr</span><span class="p">)</span> <span class="p">}</span> <span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC2495" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">),</span> <span class="n" style="color: #333;">lie</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2496" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">captureTopConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2497" class="line" lang="haskell"> <span class="n" style="color: #333;">pushTcLevelM</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC2500" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">_tc_expr</span><span class="p">,</span> <span class="n" style="color: #333;">expr_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferSigma</span> <span class="n" style="color: #333;">rn_expr</span></span>
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<pre style="margin: 0;">-<span id="LC2501" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">inst</span></span>
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<pre style="margin: 0;">-<span id="LC2502" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">snd</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">deeplyInstantiate</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">expr_ty</span></span>
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<pre style="margin: 0;">-<span id="LC2503" 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;">expr_ty</span> <span class="p">}</span> <span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC2498" 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;">_tc_expr</span><span class="p">,</span> <span class="n" style="color: #333;">expr_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_infer</span> <span class="n" style="color: #333;">rn_expr</span></span>
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<pre style="margin: 0;">+<span id="LC2499" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">expr_ty</span> <span class="p">}</span> <span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC2500" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2501" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Generalise</span></span>
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<pre style="margin: 0;"> <span id="LC2502" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">qtvs</span><span class="p">,</span> <span class="n" style="color: #333;">dicts</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">residual</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2526,6 +2522,8 @@ tcRnExpr hsc_env mode rdr_expr</td>
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2526
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2522
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<pre style="margin: 0;"> <span id="LC2522" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">snd</span> <span class="p">(</span><span class="n" style="color: #333;">normaliseType</span> <span class="n" style="color: #333;">fam_envs</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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2527
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2523
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<pre style="margin: 0;"> <span id="LC2523" class="line" lang="haskell"> <span class="p">}</span></span>
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2528
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2524
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<pre style="margin: 0;"> <span id="LC2524" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2525
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<pre style="margin: 0;">+<span id="LC2525" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_infer</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInferRhoNC</span></span>
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2526
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<pre style="margin: 0;">+<span id="LC2526" 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;">tcInferAppHead</span></span>
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2529
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2527
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<pre style="margin: 0;"> <span id="LC2527" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [TcRnExprMode]</span></span>
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2530
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2528
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<pre style="margin: 0;"> <span id="LC2528" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">inst</span><span class="p">,</span> <span class="n" style="color: #333;">infer_mode</span><span class="p">,</span> <span class="n" style="color: #333;">perhaps_disable_default_warnings</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mode</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2531
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2529
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<pre style="margin: 0;"> <span id="LC2529" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TM_Inst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NoRestrictions</span><span class="p">,</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<li id="5c0a7f8291c984f0fc06f59e7cf10dbecc11598b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#5c0a7f8291c984f0fc06f59e7cf10dbecc11598b"><strong>compiler/GHC/Tc/TyCl/PatSyn.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="149" 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="149" 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">@@ -149,8 +149,7 @@ tcInferPatSynDecl (PSB { psb_id = lname@(L _ name), psb_args = details</td>
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149
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149
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">arg_names</span><span class="p">,</span> <span class="n" style="color: #333;">rec_fields</span><span class="p">,</span> <span class="n" style="color: #333;">is_infix</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collectPatSynArgInfo</span> <span class="n" style="color: #333;">details</span></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="p">((</span><span class="n" style="color: #333;">lpat'</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">),</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">))</span></span>
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151
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelAndCaptureConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC152" class="line" lang="haskell"> <span class="n" style="color: #333;">tcInferNoInst</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">exp_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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153
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="haskell"> <span class="n" style="color: #333;">tcPat</span> <span class="kt" style="color: #458; font-weight: 600;">PatSyn</span> <span class="n" style="color: #333;">lpat</span> <span class="n" style="color: #333;">exp_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"> <span class="n" style="color: #333;">tcInferPat</span> <span class="kt" style="color: #458; font-weight: 600;">PatSyn</span> <span class="n" style="color: #333;">lpat</span> <span class="o" style="font-weight: 600;">$</span></span>
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154
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">tcLookupId</span> <span class="n" style="color: #333;">arg_names</span></span>
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155
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154
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ex_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">prov_dicts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcCollectEx</span> <span class="n" style="color: #333;">lpat'</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="389" 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="388" 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">@@ -389,9 +388,9 @@ tcCheckPatSynDecl psb@PSB{ psb_id = lname@(L _ name), psb_args = details</td>
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389
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388
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">req_dicts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newEvVars</span> <span class="n" style="color: #333;">req_theta</span></span>
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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">lpat'</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">ex_tvs'</span><span class="p">,</span> <span class="n" style="color: #333;">prov_dicts</span><span class="p">,</span> <span class="n" style="color: #333;">args'</span><span class="p">)))</span> <span class="o" style="font-weight: 600;"><-</span></span>
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<pre style="margin: 0;"> <span id="LC390" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">equalLength</span> <span class="n" style="color: #333;">arg_names</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg_names</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg_tys</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"> <span class="n" style="color: #333;">pushLevelAndCaptureConstraints</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"> <span class="n" style="color: #333;">tcExtendTyVarEnv</span> <span class="n" style="color: #333;">univ_tvs</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC394" class="line" lang="haskell"> <span class="n" style="color: #333;">tc<span class="idiff left">Pat</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PatSyn</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lpat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkCheckExpType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat_ty</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"> <span class="n" style="color: #333;">pushLevelAndCaptureConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"> <span class="n" style="color: #333;">tcExtendTyVarEnv</span> <span class="n" style="color: #333;">univ_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"> <span class="n" style="color: #333;">tc<span class="idiff left">CheckPat</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PatSyn</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lpat</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat_ty</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">univ_tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"> <span class="n" style="color: #333;">empty_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="n" style="color: #333;">in_scope</span></span>
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">ex_tvs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapAccumLM</span> <span class="n" style="color: #333;">newMetaTyVarX</span> <span class="n" style="color: #333;">empty_subst</span> <span class="n" style="color: #333;">ex_tvs</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">@@ -835,9 +835,8 @@ addLocM :: (a -> TcM b) -> Located a -> TcM b</td>
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="haskell"><span class="n" style="color: #333;">addLocM</span> <span class="n" style="color: #333;">fn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <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 class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC837" class="line" lang="haskell"><span class="n" style="color: #333;">wrapLocM</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</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;">Located</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC838" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- wrapLocM :: (a -> TcM b) -> Located a -> TcM (Located b)</span></span>
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"><span class="n" style="color: #333;">wrapLocM</span> <span class="n" style="color: #333;">fn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <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 class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC840" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC839" 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;">loc</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"><span class="n" style="color: #333;">wrapLocFstM</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span><span class="n" style="color: #333;">c</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">c</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"><span class="n" style="color: #333;">wrapLocFstM</span> <span class="n" style="color: #333;">fn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#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">@@ -563,13 +563,9 @@ tcSubTypeET orig ctxt (Check ty_actual) ty_expected</td>
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">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="LC564" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubTypeET</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Infer</span> <span class="n" style="color: #333;">inf_res</span><span class="p">)</span> <span class="n" style="color: #333;">ty_expected</span></span>
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<pre style="margin: 0;">-<span id="LC566" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">ir_inst</span> <span class="n" style="color: #333;">inf_res</span><span class="p">),</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inf_res</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty_expected</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC567" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- An (Infer inf_res) ExpSigmaType passed into tcSubTypeET never</span></span>
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<pre style="margin: 0;">-<span id="LC568" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- has the ir_inst field set. Reason: in patterns (which is what</span></span>
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<pre style="margin: 0;">-<span id="LC569" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tcSubTypeET is used for) do not aggressively instantiate</span></span>
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<pre style="margin: 0;">-<span id="LC570" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fill_infer_result</span> <span class="n" style="color: #333;">ty_expected</span> <span class="n" style="color: #333;">inf_res</span></span>
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<pre style="margin: 0;">-<span id="LC571" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Since ir_inst is false, we can skip fillInferResult</span></span>
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<pre style="margin: 0;">-<span id="LC572" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and go straight to fill_infer_result</span></span>
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="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="n" style="color: #333;">fillInferResult</span> <span class="n" style="color: #333;">ty_expected</span> <span class="n" style="color: #333;">inf_res</span></span>
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In patterns we ignore the ir_inst field</span></span>
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and never instantatiate</span></span>
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpCastN</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcSymCo</span> <span class="n" style="color: #333;">co</span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC571" 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">@@ -643,7 +639,7 @@ tcSubTypeDS_NC_O :: CtOrigin -- origin used for instantiation only</td>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ty_expected is deeply skolemised</span></span>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubTypeDS_NC_O</span> <span class="n" style="color: #333;">inst_orig</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">m_thing</span> <span class="n" style="color: #333;">ty_actual</span> <span class="n" style="color: #333;">ty_expected</span></span>
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ty_expected</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC646" 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;"><span class="idiff left right">f</span>illInferResult</span> <span class="n" style="color: #333;">inst_orig</span> <span class="n" style="color: #333;">ty_actual</span> <span class="n" style="color: #333;">inf_res</span></span>
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<pre style="margin: 0;">+<span id="LC642" 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;"><span class="idiff left right">instantiateAndF</span>illInferResult</span> <span class="n" style="color: #333;">inst_orig</span> <span class="n" style="color: #333;">ty_actual</span> <span class="n" style="color: #333;">inf_res</span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Check</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tc_sub_type_ds</span> <span class="n" style="color: #333;">eq_orig</span> <span class="n" style="color: #333;">inst_orig</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ty_actual</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"> <span class="n" style="color: #333;">eq_orig</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;">ty_actual</span><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;">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">@@ -864,7 +860,7 @@ tcWrapResultO orig rn_expr expr actual_ty res_ty</td>
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860
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC861" 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="LC862" 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="LC867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ExpType functions: tcInfer, <span class="idiff left right">f</span>illInferResult</span></span>
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ExpType functions: tcInfer, <span class="idiff left right">instantiateAndF</span>illInferResult</span></span>
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<pre style="margin: 0;"> <span id="LC864" 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="LC865" 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="LC866" 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">@@ -884,24 +880,24 @@ tcInfer instantiate tc_check</td>
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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC881" 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;">result</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC887" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">f</span>illInferResult</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InferResult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span></span>
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<pre style="margin: 0;">-<span id="LC888" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If wrap = <span class="idiff left right">f</span>illInferResult t1 t2</span></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">instantiateAndF</span>illInferResult</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InferResult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span></span>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If wrap = <span class="idiff left right">instantiateAndF</span>illInferResult t1 t2</span></span>
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<pre style="margin: 0;"> <span id="LC885" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- => wrap :: t1 ~> t2</span></span>
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<pre style="margin: 0;"> <span id="LC886" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deep instantiation of InferResult]</span></span>
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<pre style="margin: 0;">-<span id="LC891" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">f</span>illInferResult</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">inf_res</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IR</span> <span class="p">{</span> <span class="n" style="color: #333;">ir_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">instantiate_me</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC892" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">instantiate_me</span></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">instantiateAndF</span>illInferResult</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">inf_res</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IR</span> <span class="p">{</span> <span class="n" style="color: #333;">ir_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">instantiate_me</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">instantiate_me</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- This is *the* place where ir_inst is consulted</span></span></span>
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<pre style="margin: 0;"> <span id="LC889" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">deeplyInstantiate</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC894" 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;">fill<span class="idiff left right">_infer_r</span>esult</span> <span class="n" style="color: #333;">rho</span> <span class="n" style="color: #333;">inf_res</span></span>
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<pre style="margin: 0;">+<span id="LC890" 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;">fill<span class="idiff left right">InferR</span>esult</span> <span class="n" style="color: #333;">rho</span> <span class="n" style="color: #333;">inf_res</span></span>
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<pre style="margin: 0;"> <span id="LC891" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpCastN</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">wrap</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC892" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC893" 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="LC898" 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;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fill<span class="idiff left right">_infer_r</span>esult</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">inf_res</span></span>
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<pre style="margin: 0;">+<span id="LC894" 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;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fill<span class="idiff left right">InferR</span>esult</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">inf_res</span></span>
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<pre style="margin: 0;"> <span id="LC895" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpCastN</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC896" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC901" class="line" lang="haskell"><span class="n" style="color: #333;">fill<span class="idiff left right">_infer_r</span>esult</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;">InferResult</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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<pre style="margin: 0;">-<span id="LC902" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If wrap = fill<span class="idiff left right">_infer_r</span>esult t1 t2</span></span>
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<pre style="margin: 0;">+<span id="LC897" class="line" lang="haskell"><span class="n" style="color: #333;">fill<span class="idiff left right">InferR</span>esult</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;">InferResult</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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<pre style="margin: 0;">+<span id="LC898" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If wrap = fill<span class="idiff left right">InferR</span>esult t1 t2</span></span>
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<pre style="margin: 0;"> <span id="LC899" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- => wrap :: t1 ~> t2</span></span>
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<pre style="margin: 0;">-<span id="LC904" class="line" lang="haskell"><span class="n" style="color: #333;">fill<span class="idiff left right">_infer_r</span>esult</span> <span class="n" style="color: #333;">orig_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IR</span> <span class="p">{</span> <span class="n" style="color: #333;">ir_uniq</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="n" style="color: #333;">ir_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_lvl</span></span>
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<pre style="margin: 0;">+<span id="LC900" class="line" lang="haskell"><span class="n" style="color: #333;">fill<span class="idiff left right">InferR</span>esult</span> <span class="n" style="color: #333;">orig_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IR</span> <span class="p">{</span> <span class="n" style="color: #333;">ir_uniq</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="n" style="color: #333;">ir_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_lvl</span></span>
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<pre style="margin: 0;"> <span id="LC901" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ir_ref</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ref</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC902" 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;">ty_co</span><span class="p">,</span> <span class="n" style="color: #333;">ty_to_fill_with</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">promoteTcType</span> <span class="n" style="color: #333;">res_lvl</span> <span class="n" style="color: #333;">orig_ty</span></span>
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<pre style="margin: 0;"> <span id="LC903" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#abcf7b1089a70205ab1b496e30391c2e6bc32e27"><strong>testsuite/tests/quantified-constraints/T17458.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">T17458.hs:32:<span class="idiff left right">27</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T17458.hs:32:<span class="idiff left right">32</span>: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Reduction stack overflow; size = 201</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> When simplifying the following type: Typeable Void</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> Use -freduction-depth=0 to disable this check</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#232c624b3aebd964c68b9403ab8e70550e7e4871"><strong>testsuite/tests/typecheck/should_compile/T18005.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">@@ -27,4 +27,5 @@ unT2b' :: T2b -> S2</td>
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27
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">unT2b'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT2b</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">MkT2b'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">S2</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T2b</span></span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">MkT2b'</span> <span class="p">{</span><span class="n" style="color: #333;">unT2b</span><span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">(</span><span class="n" style="color: #333;">unT2b'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unT2b</span><span class="p">)</span></span></pre>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- pattern MkT2b' {unT2b} <- (unT2b' -> unT2b)</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">MkT2b'</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">(</span><span class="n" style="color: #333;">unT2b'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8531783ae7eb9f2f8bc76508e16fd6fc5d00e844#0158b6615005db39bac2e708ca62ed4a319172de"><strong>testsuite/tests/typecheck/should_fail/T3176.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">T3176.hs:9:27:</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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4
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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 expression: 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="LC7" class="line" lang="plaintext"> In the expression: show $ unES $ f t</span></pre>
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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 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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