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<h3>
Simon Peyton Jones pushed to branch wip/T18126
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c707d999219a38e0927cc04b7fa2f170abd562cc">c707d999</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-09-14T13:12:05+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">QL wibbles following RAE review
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e5c372a765e35984e5283ae0dfba0c679848692">2e5c372a</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-14T13:15:33+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">QL wibbles following RAE review
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00">4c56d0af</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-14T13:16:50+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">wibbles generalilsation
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<h4>14 changed files:</h4>
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<li class="file-stats">
<a href="#6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
compiler/GHC/Tc/Gen/App.hs
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<li class="file-stats">
<a href="#902811828741e6bcd64702935bbb54edbbd070ef">
compiler/GHC/Tc/Gen/Expr.hs
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<li class="file-stats">
<a href="#8dec347fbe40358b852d7b50ace1e4d62b9b6660">
compiler/GHC/Tc/Gen/Expr.hs-boot
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<li class="file-stats">
<a href="#36920f1fa315563c590243b1b096096bc305ca70">
compiler/GHC/Tc/Gen/Head.hs
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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<a href="#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a">
compiler/GHC/Tc/Module.hs
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<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">
compiler/GHC/Tc/Utils/TcMType.hs
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<a href="#0c5793f6dcb75a08fee0d064f8b19626ba778eb4">
docs/users_guide/exts/impredicative_types.rst
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<a href="#b02c1c6109c60b8f685234b0dbaabf6c79fed2a2">
docs/users_guide/ghci.rst
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<li class="file-stats">
<a href="#fa8150a02afc8d7030a5c769256631c5d43f9d76">
testsuite/tests/impredicative/all.T
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testsuite/tests/impredicative/expr-sig.hs
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<h4>Changes:</h4>
<li id="6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#6a1f039ed7725eddef15dd5f4dc318a3434f26c9"><strong>compiler/GHC/Tc/Gen/App.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="102" 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="102" 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">@@ -102,7 +102,7 @@ tcInferSigma inst (L loc rn_expr)</td>
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<td class="diff-line-num old_line" data-linenumber="102" 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">
102
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<td class="diff-line-num new_line" data-linenumber="102" 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="LC102" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addExprCtxt</span> <span class="n" style="color: #333;">rn_expr</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num old_line" data-linenumber="103" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
103
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<td class="diff-line-num new_line" data-linenumber="103" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
103
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num old_line" data-linenumber="104" 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">
104
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<td class="diff-line-num new_line" data-linenumber="104" 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="LC104" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">do_ql</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wantQuickLook</span> <span class="n" style="color: #333;">rn_fun</span></span>
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<td class="diff-line-num old old_line" data-linenumber="105" 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">
105
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<td class="diff-line-num new_line old" data-linenumber="105" 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="LC105" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tc_fun</span><span class="p">,</span> <span class="n" style="color: #333;">fun_sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">rn_args</span></span>
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<td class="diff-line-num new old_line" data-linenumber="106" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tc_fun</span><span class="p">,</span> <span class="n" style="color: #333;">fun_sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">rn_args</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nothing</span></span></span>
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<td class="diff-line-num old_line" data-linenumber="106" 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">
106
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<td class="diff-line-num new_line" data-linenumber="106" 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="LC106" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">_delta</span><span class="p">,</span> <span class="n" style="color: #333;">inst_args</span><span class="p">,</span> <span class="n" style="color: #333;">app_res_sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstFun</span> <span class="n" style="color: #333;">do_ql</span> <span class="n" style="color: #333;">inst</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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<td class="diff-line-num old_line" data-linenumber="107" 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">
107
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<td class="diff-line-num new_line" data-linenumber="107" 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="LC107" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">_tc_args</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcValArgs</span> <span class="n" style="color: #333;">do_ql</span> <span class="n" style="color: #333;">tc_fun</span> <span class="n" style="color: #333;">inst_args</span></span>
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<td class="diff-line-num old_line" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="108" 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="LC108" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">app_res_sigma</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="133" 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="133" 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">@@ -133,7 +133,10 @@ head ::= f -- HsVar: variables</td>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="134" 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="LC134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When tcExpr sees something that starts an application chain (namely,</span></span>
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<td class="diff-line-num old_line" data-linenumber="135" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="135" 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="LC135" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">any of the constructors in 'app' or 'head'), it invokes tcApp to</span></span>
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<td class="diff-line-num old old_line" data-linenumber="136" 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="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">typecheck it: see Note [tcApp: typechecking applications].</span></span>
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<td class="diff-line-num new old_line" data-linenumber="137" 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="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">typecheck it: see Note [tcApp: typechecking applications]. However,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="137" 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="LC137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for HsPar and HsPragE, there is no tcWrapResult (which would</span></span>
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<td class="diff-line-num new new_line" data-linenumber="138" 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="LC138" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instantiate types, bypassing Quick Look), so nothing is gained by</span></span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">using the application chain route, and we can just recurse to tcExpr.</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A "head" has three special cases (for which we can infer a polytype</span></span>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">using tcInferAppHead_maybe); otherwise is just any old expression (for</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">@@ -142,6 +145,14 @@ which we can infer a rho-type (via tcInfer).</td>
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142
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is no special treatment for HsUnboundVar, HsOverLit etc, because</span></span>
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143
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we can't get a polytype from them.</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="cm" style="color: #998; font-style: italic;">It may not be immediately obvious why ExprWithTySig (e::ty) should be</span></span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dealt with by tcApp, even when it is not applied to anything. Consider</span></span>
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: [forall a. a->a] -> Int</span></span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...(f (undefined :: forall b. b))...</span></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Clearly this should work! But it will /only/ work because if we</span></span>
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instantiate that (forall b. b) impredicatively! And that only happens</span></span>
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in tcApp.</span></span>
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [tcApp: typechecking applications]</span></span>
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<pre style="margin: 0;"> <span id="LC157" 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="LC158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tcApp implements the APP-Downarrow/Uparrow rule of</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -211,6 +222,7 @@ tcApp :: HsExpr GhcRn -> ExpRhoType -> TcM (HsExpr GhcTc)</td>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"><span class="n" style="color: #333;">tcApp</span> <span class="n" style="color: #333;">rn_expr</span> <span class="n" style="color: #333;">exp_res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">rn_fun</span><span class="p">,</span> <span class="n" style="color: #333;">rn_args</span><span class="p">,</span> <span class="n" style="color: #333;">rebuild</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitHsApps</span> <span class="n" style="color: #333;">rn_expr</span></span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tc_fun</span><span class="p">,</span> <span class="n" style="color: #333;">fun_sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">rn_args</span></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">checkingExpType_maybe</span> <span class="n" style="color: #333;">exp_res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Instantiate</span></span>
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">do_ql</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wantQuickLook</span> <span class="n" style="color: #333;">rn_fun</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="718" 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">@@ -706,7 +718,7 @@ quickLookArg1 :: Bool -> Delta -> LHsExpr GhcRn -> TcSigmaType</td>
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706
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718
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<pre style="margin: 0;"> <span id="LC718" class="line" lang="haskell"><span class="n" style="color: #333;">quickLookArg1</span> <span class="n" style="color: #333;">guarded</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">larg</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;">arg</span><span class="p">)</span> <span class="n" style="color: #333;">arg_ty</span></span>
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707
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719
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<pre style="margin: 0;"> <span id="LC719" 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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708
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720
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<pre style="margin: 0;"> <span id="LC720" 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="p">(</span><span class="n" style="color: #333;">rn_fun</span><span class="p">,</span><span class="n" style="color: #333;">rn_args</span><span class="p">,</span><span class="n" style="color: #333;">rebuild</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitHsApps</span> <span class="n" style="color: #333;">arg</span></span>
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709
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb_fun_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead_maybe</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">rn_args</span></span>
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721
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb_fun_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead_maybe</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">rn_args</span><span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg_ty</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"quickLookArg 1"</span> <span class="o" style="font-weight: 600;">$</span></span>
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723
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"arg:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg</span></span>
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712
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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;">text</span> <span class="s" style="color: #d14;">"head:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rn_fun</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mb_fun_ty</span></span>
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<li id="902811828741e6bcd64702935bbb54edbbd070ef">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#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">@@ -17,7 +17,7 @@ module GHC.Tc.Gen.Expr</td>
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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;">tcCheckPolyExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcCheckPolyExprNC</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcCheckMonoExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcCheckMonoExprNC</span><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 class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcInferRho</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferRhoNC</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcExpr</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">tcExprWithSig</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcExpr</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <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 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 class="nf" style="color: #900; font-weight: 600;">synKnownType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcCheckId</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addAmbiguousNameErr</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">@@ -39,9 +39,7 @@ import GHC.Core.UsageEnv</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.App</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Head</span></span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Bind</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">chooseInferredQuantifiers</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcLocalBinds</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Sig</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">tcUserTypeSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstSig</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">simplifyInfer</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">InferMode</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Bind</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">tcLocalBinds</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Instance.Family</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">tcGetFamInstEnvs</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FamInstEnv</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Env</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">addUsedGRE</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">@@ -63,7 +61,6 @@ import GHC.Types.Name.Env</td>
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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.Types.Name.Set</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Reader</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</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;">GHC.Core.TyCo.Rep</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;">GHC.Core.Type</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;">GHC.Tc.Types.Evidence</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;">GHC.Types.Var.Set</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="180" 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">@@ -183,9 +180,13 @@ tcExpr :: HsExpr GhcRn -> ExpRhoType -> TcM (HsExpr GhcTc)</td>
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - HsVar: lone variables, to ensure that they can get an</span></span>
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- impredicative instantiation (via Quick Look</span></span>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- driven by res_ty (in checking mode).</span></span>
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<pre style="margin: 0;">-<span id="LC186" 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;">HsVar</span> <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;">tcApp</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC187" 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;">HsApp</span> <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;">tcApp</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC188" 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;">HsAppType</span> <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;">tcApp</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - ExprWithTySig: (e :: type)</span></span>
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Application chains and heads] in GHC.Tc.Gen.App</span></span>
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<pre style="margin: 0;">+<span id="LC185" 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;">HsVar</span> <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;">tcApp</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC186" 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;">HsApp</span> <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;">tcApp</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">res_ty</span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">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;">HsAppType</span> <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;">tcApp</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC188" 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="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;">tcApp</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="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;">tcApp</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Typecheck an occurrence of an unbound Id</span></span>
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -287,10 +288,6 @@ tcExpr e@(HsLamCase x matches) res_ty</td>
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<pre style="margin: 0;"> <span id="LC288" 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="LC289" 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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<pre style="margin: 0;"> <span id="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC290" 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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291
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<pre style="margin: 0;">-<span id="LC291" 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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<pre style="margin: 0;">-<span id="LC292" 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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<pre style="margin: 0;">-<span id="LC293" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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292
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Type-checking overloaded labels]</span></span>
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<pre style="margin: 0;"> <span id="LC293" 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">@@ -910,8 +907,6 @@ tcExpr expr@(RecordUpd { rupd_expr = record_expr, rupd_flds = rbnds }) res_ty</td>
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910
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907
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<pre style="margin: 0;"> <span id="LC907" class="line" lang="haskell"></span>
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911
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908
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<pre style="margin: 0;"> <span id="LC908" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcWrapResult</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">expr'</span> <span class="n" style="color: #333;">rec_res_ty</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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912
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909
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<pre style="margin: 0;"> <span id="LC909" class="line" lang="haskell"></span>
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913
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<pre style="margin: 0;">-<span id="LC913" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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914
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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcCheckRecSelId</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">res_ty</span></span>
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910
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<pre style="margin: 0;"> <span id="LC910" class="line" lang="haskell"></span>
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911
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<pre style="margin: 0;"> <span id="LC911" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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917
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<pre style="margin: 0;"> <span id="LC912" 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="1066" 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="1061" 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">@@ -1066,7 +1061,9 @@ tcSyntaxOpGen :: CtOrigin</td>
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1066
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1061
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<pre style="margin: 0;"> <span id="LC1061" 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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Mult</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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1067
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1062
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<pre style="margin: 0;"> <span id="LC1062" 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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1068
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<td class="diff-line-num new_line" data-linenumber="1063" 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">
1063
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<pre style="margin: 0;"> <span id="LC1063" 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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1069
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<pre style="margin: 0;">-<span id="LC1069" 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;">tcInferAppHead</span> <span class="n" style="color: #333;">op</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1064
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<pre style="margin: 0;">+<span id="LC1064" 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;">tcInferAppHead</span> <span class="n" style="color: #333;">op</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1065
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<pre style="margin: 0;">+<span id="LC1065" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Nothing here might be improved, but all this</span></span>
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1066
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<pre style="margin: 0;">+<span id="LC1066" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- code is scheduled for demolition anyway</span></span>
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1070
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1067
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<pre style="margin: 0;"> <span id="LC1067" 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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1071
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1068
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<pre style="margin: 0;"> <span id="LC1068" 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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1072
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1069
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<pre style="margin: 0;"> <span id="LC1069" 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="diff-line-num unfold js-unfold new_line" data-linenumber="1236" 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">@@ -1239,99 +1236,6 @@ Here's an example where it actually makes a real difference</td>
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1239
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1236
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<pre style="margin: 0;"> <span id="LC1236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">With the change, f1 will type-check, because the 'Char' info from</span></span>
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1240
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1237
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<pre style="margin: 0;"> <span id="LC1237" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the signature is propagated into MkQ's argument. With the check</span></span>
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1241
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1238
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<pre style="margin: 0;"> <span id="LC1238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the other order, the extra signature in f2 is reqd.</span></span>
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1242
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<pre style="margin: 0;">-<span id="LC1242" class="line" lang="haskell"></span>
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1243
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<pre style="margin: 0;">-<span id="LC1243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1244
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<pre style="margin: 0;">-<span id="LC1244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1245
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<pre style="margin: 0;">-<span id="LC1245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Expressions with a type signature</span></span>
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1246
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<pre style="margin: 0;">-<span id="LC1246" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> expr :: type</span></span>
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1247
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<pre style="margin: 0;">-<span id="LC1247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1248
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<pre style="margin: 0;">-<span id="LC1248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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1249
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<pre style="margin: 0;">-<span id="LC1249" class="line" lang="haskell"></span>
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1250
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<pre style="margin: 0;">-<span id="LC1250" 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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1251
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<pre style="margin: 0;">-<span id="LC1251" 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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1252
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<pre style="margin: 0;">-<span id="LC1252" 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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1253
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<pre style="margin: 0;">-<span id="LC1253" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="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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1254
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<pre style="margin: 0;">-<span id="LC1254" 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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<pre style="margin: 0;">-<span id="LC1255" 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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1256
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<pre style="margin: 0;">-<span id="LC1256" 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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1257
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<td class="diff-line-num new_line old" data-linenumber="1239" 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="LC1257" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1258
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<pre style="margin: 0;">-<span id="LC1258" 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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1259
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<td class="diff-line-num new_line old" data-linenumber="1239" 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="LC1259" class="line" lang="haskell"></span>
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1260
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<td class="diff-line-num new_line old" data-linenumber="1239" 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="LC1260" class="line" lang="haskell"><span class="n" style="color: #333;">tcExprSig</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;">TcIdSigInfo</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;">GhcTc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>
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1261
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<td class="diff-line-num new_line old" data-linenumber="1239" 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="LC1261" class="line" lang="haskell"><span class="n" style="color: #333;">tcExprSig</span> <span class="n" style="color: #333;">expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CompleteSig</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">poly_id</span><span class="p">,</span> <span class="n" style="color: #333;">sig_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span></span>
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1262
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<td class="diff-line-num new_line old" data-linenumber="1239" 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="LC1262" 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 class="c1" style="color: #998; font-style: italic;">-- Sets the location for the implication constraint</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1263" 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">
1263
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<td class="diff-line-num new_line old" data-linenumber="1239" 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="LC1263" 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;">poly_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">poly_id</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1264" 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">
1264
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<pre style="margin: 0;">-<span id="LC1264" 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;">expr'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSkolemiseScoped</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="n" style="color: #333;">poly_ty</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;">rho_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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1265
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<pre style="margin: 0;">-<span id="LC1265" class="line" lang="haskell"> <span class="n" style="color: #333;">tcCheckMonoExprNC</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">rho_ty</span></span>
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1266
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<pre style="margin: 0;">-<span id="LC1266" 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;">poly_ty</span><span class="p">)</span> <span class="p">}</span></span>
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1267
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<pre style="margin: 0;">-<span id="LC1267" class="line" lang="haskell"></span>
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1268
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<pre style="margin: 0;">-<span id="LC1268" class="line" lang="haskell"><span class="n" style="color: #333;">tcExprSig</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PartialSig</span> <span class="p">{</span> <span class="n" style="color: #333;">psig_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">sig_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span></span>
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1269
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<td class="diff-line-num new_line old" data-linenumber="1239" 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="LC1269" 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;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Sets the location for the implication constraint</span></span>
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1270
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<td class="diff-line-num new_line old" data-linenumber="1239" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1270" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">))</span></span>
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1271
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<pre style="margin: 0;">-<span id="LC1271" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelAndCaptureConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
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1272
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<pre style="margin: 0;">-<span id="LC1272" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_inst</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstSig</span> <span class="n" style="color: #333;">sig</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1273" 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">
1273
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<td class="diff-line-num new_line old" data-linenumber="1239" 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="LC1273" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcExtendNameTyVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">mapSnd</span> <span class="n" style="color: #333;">binderVar</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">sig_inst_skols</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1274" 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">
1274
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<pre style="margin: 0;">-<span id="LC1274" class="line" lang="haskell"> <span class="n" style="color: #333;">tcExtendNameTyVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">sig_inst_wcs</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1275
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<pre style="margin: 0;">-<span id="LC1275" class="line" lang="haskell"> <span class="n" style="color: #333;">tcCheckPolyExprNC</span> <span class="n" style="color: #333;">expr</span> <span class="p">(</span><span class="n" style="color: #333;">sig_inst_tau</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span></span>
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1276
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<pre style="margin: 0;">-<span id="LC1276" 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;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span> <span class="p">}</span></span>
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1277
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<pre style="margin: 0;">-<span id="LC1277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Partial expression signatures]</span></span>
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1278
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<pre style="margin: 0;">-<span id="LC1278" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tau</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_inst_tau</span> <span class="n" style="color: #333;">sig_inst</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1279" 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">
1279
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<pre style="margin: 0;">-<span id="LC1279" class="line" lang="haskell"> <span class="n" style="color: #333;">infer_mode</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">sig_inst_theta</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span></span>
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1280
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<pre style="margin: 0;">-<span id="LC1280" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isNothing</span> <span class="p">(</span><span class="n" style="color: #333;">sig_inst_wcx</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span></span>
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1281
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<pre style="margin: 0;">-<span id="LC1281" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ApplyMR</span></span>
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1282
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<td class="diff-line-num new_line old" data-linenumber="1239" 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="LC1282" 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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1283
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<pre style="margin: 0;">-<span id="LC1283" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoRestrictions</span></span>
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1284
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<pre style="margin: 0;">-<span id="LC1284" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">qtvs</span><span class="p">,</span> <span class="n" style="color: #333;">givens</span><span class="p">,</span> <span class="n" style="color: #333;">ev_binds</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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1285
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<pre style="margin: 0;">-<span id="LC1285" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplifyInfer</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">infer_mode</span> <span class="p">[</span><span class="n" style="color: #333;">sig_inst</span><span class="p">]</span> <span class="p">[(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)]</span> <span class="n" style="color: #333;">wanted</span></span>
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1286
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<pre style="margin: 0;">-<span id="LC1286" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitConstraints</span> <span class="n" style="color: #333;">residual</span></span>
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1287
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<pre style="margin: 0;">-<span id="LC1287" class="line" lang="haskell"></span>
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1288
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<pre style="margin: 0;">-<span id="LC1288" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tau</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">tau</span></span>
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1289
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<pre style="margin: 0;">-<span id="LC1289" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inferred_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">evVarPred</span> <span class="n" style="color: #333;">givens</span></span>
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1290
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<pre style="margin: 0;">-<span id="LC1290" class="line" lang="haskell"> <span class="n" style="color: #333;">tau_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">tau</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1291" 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">
1291
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<pre style="margin: 0;">-<span id="LC1291" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">binders</span><span class="p">,</span> <span class="n" style="color: #333;">my_theta</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">chooseInferredQuantifiers</span> <span class="n" style="color: #333;">inferred_theta</span></span>
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1292
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<pre style="margin: 0;">-<span id="LC1292" class="line" lang="haskell"> <span class="n" style="color: #333;">tau_tvs</span> <span class="n" style="color: #333;">qtvs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1293" 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">
1293
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<pre style="margin: 0;">-<span id="LC1293" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inferred_sigma</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInfSigmaTy</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">inferred_theta</span> <span class="n" style="color: #333;">tau</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1294" 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">
1294
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<pre style="margin: 0;">-<span id="LC1294" class="line" lang="haskell"> <span class="n" style="color: #333;">my_sigma</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInvisForAllTys</span> <span class="n" style="color: #333;">binders</span> <span class="p">(</span><span class="n" style="color: #333;">mkPhiTy</span> <span class="n" style="color: #333;">my_theta</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
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1295
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<pre style="margin: 0;">-<span id="LC1295" 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="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">inferred_sigma</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">my_sigma</span> <span class="c1" style="color: #998; font-style: italic;">-- NB: eqType ignores vis.</span></span>
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<pre style="margin: 0;">-<span id="LC1296" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">idHsWrapper</span> <span class="c1" style="color: #998; font-style: italic;">-- Fast path; also avoids complaint when we infer</span></span>
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1297
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<pre style="margin: 0;">-<span id="LC1297" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- an ambiguous type and have AllowAmbiguousType</span></span>
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1298
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<pre style="margin: 0;">-<span id="LC1298" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e..g infer x :: forall a. F a -> Int</span></span>
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1299
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<pre style="margin: 0;">-<span id="LC1299" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">tcSubTypeSigma</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="n" style="color: #333;">inferred_sigma</span> <span class="n" style="color: #333;">my_sigma</span></span>
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1300
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<pre style="margin: 0;">-<span id="LC1300" class="line" lang="haskell"></span>
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1301
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<pre style="margin: 0;">-<span id="LC1301" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcExpSig"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">qtvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">givens</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inferred_sigma</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">my_sigma</span><span class="p">)</span></span>
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1302
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<pre style="margin: 0;">-<span id="LC1302" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">poly_wrap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrap</span></span>
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1303
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<pre style="margin: 0;">-<span id="LC1303" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpTyLams</span> <span class="n" style="color: #333;">qtvs</span></span>
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<pre style="margin: 0;">-<span id="LC1304" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpLams</span> <span class="n" style="color: #333;">givens</span></span>
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1305
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<pre style="margin: 0;">-<span id="LC1305" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpLet</span> <span class="n" style="color: #333;">ev_binds</span></span>
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1306
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<pre style="margin: 0;">-<span id="LC1306" 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;">poly_wrap</span> <span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">my_sigma</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1307" class="line" lang="haskell"></span>
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1308
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<pre style="margin: 0;">-<span id="LC1308" class="line" lang="haskell"></span>
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1309
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<pre style="margin: 0;">-<span id="LC1309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Partial expression signatures]</span></span>
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1310
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<pre style="margin: 0;">-<span id="LC1310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1311
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<pre style="margin: 0;">-<span id="LC1311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Partial type signatures on expressions are easy to get wrong. But</span></span>
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1312
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<pre style="margin: 0;">-<span id="LC1312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">here is a guiding principile</span></span>
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1313
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<pre style="margin: 0;">-<span id="LC1313" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> e :: ty</span></span>
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1314
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<pre style="margin: 0;">-<span id="LC1314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">should behave like</span></span>
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1315
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<pre style="margin: 0;">-<span id="LC1315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let x :: ty</span></span>
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1316
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<pre style="margin: 0;">-<span id="LC1316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x = e</span></span>
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1317
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<pre style="margin: 0;">-<span id="LC1317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in x</span></span>
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<pre style="margin: 0;">-<span id="LC1318" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So for partial signatures we apply the MR if no context is given. So</span></span>
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<pre style="margin: 0;">-<span id="LC1320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> e :: IO _ apply the MR</span></span>
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<pre style="margin: 0;">-<span id="LC1321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> e :: _ => IO _ do not apply the MR</span></span>
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<pre style="margin: 0;">-<span id="LC1322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">just like in GHC.Tc.Gen.Bind.decideGeneralisationPlan</span></span>
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1323
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<pre style="margin: 0;">-<span id="LC1323" class="line" lang="haskell"></span>
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1324
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<pre style="margin: 0;">-<span id="LC1324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This makes a difference (#11670):</span></span>
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1325
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<pre style="margin: 0;">-<span id="LC1325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> peek :: Ptr a -> IO CLong</span></span>
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1326
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<pre style="margin: 0;">-<span id="LC1326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> peek ptr = peekElemOff undefined 0 :: _</span></span>
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<pre style="margin: 0;">-<span id="LC1327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from (peekElemOff undefined 0) we get</span></span>
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<pre style="margin: 0;">-<span id="LC1328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type: IO w</span></span>
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<pre style="margin: 0;">-<span id="LC1329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constraints: Storable w</span></span>
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<pre style="margin: 0;">-<span id="LC1330" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We must NOT try to generalise over 'w' because the signature specifies</span></span>
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1332
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<pre style="margin: 0;">-<span id="LC1332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">no constraints so we'll complain about not being able to solve</span></span>
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1333
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<pre style="margin: 0;">-<span id="LC1333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Storable w. Instead, don't generalise; then _ gets instantiated to</span></span>
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1334
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<pre style="margin: 0;">-<span id="LC1334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CLong, as it should.</span></span>
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1239
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<pre style="margin: 0;"> <span id="LC1239" 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="LC1240" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#8dec347fbe40358b852d7b50ace1e4d62b9b6660"><strong>compiler/GHC/Tc/Gen/Expr.hs-boot</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Expr</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SyntaxExprRn</span></span>
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3
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SyntaxExprTc</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">LHsSigWcType</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SyntaxExprTc</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SyntaxOpType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ExpType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.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.Core.Type</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Mult</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.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;">GhcTc</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">NoGhcTc</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.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;">GhcTc</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckPolyExpr</span><span class="p">,</span> <span class="n" style="color: #333;">tcCheckPolyExprNC</span> <span class="o" style="font-weight: 600;">::</span></span>
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<pre style="margin: 0;"> <span id="LC11" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -23,9 +23,6 @@ tcCheckMonoExpr, tcCheckMonoExprNC ::</td>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC26" 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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<pre style="margin: 0;">-<span id="LC27" 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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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC26" 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="LC27" 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 class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<li id="36920f1fa315563c590243b1b096096bc305ca70">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#36920f1fa315563c590243b1b096096bc305ca70"><strong>compiler/GHC/Tc/Gen/Head.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">@@ -19,16 +19,18 @@ module GHC.Tc.Gen.Head</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"></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;">tcInferAppHead</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferAppHead_maybe</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;">tcInferId</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcCheckId</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;">tcCheckRecSelId</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;">disambiguateSelector</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">obviousSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addAmbiguousNameErr</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;">obviousSig</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addAmbiguousNameErr</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;">tyConOf</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyConOfET</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupParents</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">fieldNotInType</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;">notSelector</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nonBidirectionalErr</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprCtxt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addLExprCtxt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addExprCtxt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addFunResCtxt</span> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC27" 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="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;">tcExpr</span><span class="p">,</span> <span class="n" style="color: #333;">tc<span class="idiff left right">ExprWithSig</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="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;">tcExpr</span><span class="p">,</span> <span class="n" style="color: #333;">tc<span class="idiff left">CheckMonoExprNC</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tcCheckPolyExprNC</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"></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="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;">+<span id="LC30" 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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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Pat</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Bind</span><span class="p">(</span> <span class="n" style="color: #333;">chooseInferredQuantifiers</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Sig</span><span class="p">(</span> <span class="n" style="color: #333;">tcUserTypeSig</span><span class="p">,</span> <span class="n" style="color: #333;">tcInstSig</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.TyCl.PatSyn</span><span class="p">(</span> <span class="n" style="color: #333;">patSynBuilderOcc</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</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">@@ -39,13 +41,12 @@ import GHC.Core.FamInstEnv ( FamInstEnvs )</td>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.UsageEnv</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">unitUE</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Env</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">addUsedGRE</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Utils</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">addNameClashErrRn</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unknownSubordinateErr</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">InferMode</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">simplifyInfer</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span></span>
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<pre style="margin: 0;">-<span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.HsType</span></span>
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<pre style="margin: 0;">-<span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Pat</span></span>
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<pre style="margin: 0;">-<span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Sig</span><span class="p">(</span> <span class="n" style="color: #333;">isCompleteHsSig</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Origin</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">TcType</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id.Info</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.ConLike</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">@@ -317,7 +318,8 @@ pprHsExprArgTc arg = ppr arg</td>
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<pre style="margin: 0;"> <span id="LC318" 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="LC319" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC320" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAppHead</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">-<span id="LC320" 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;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC321" 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;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These two args are solely for tcInferRecSelId</span></span>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="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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<pre style="margin: 0;"> <span id="LC324" 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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<pre style="margin: 0;"> <span id="LC325" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -339,26 +341,29 @@ tcInferAppHead :: HsExpr GhcRn</td>
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<pre style="margin: 0;"> <span id="LC341" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- cases are dealt with by splitHsApps.</span></span>
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<pre style="margin: 0;"> <span id="LC342" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC343" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [tcApp: typechecking applications] in GHC.Tc.Gen.App</span></span>
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpanFromArgs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC344" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mb_tc_fun</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead_maybe</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">args</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">mb_res_ty</span></span></span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpanFromArgs</span> <span class="n" style="color: #333;">args</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="LC346" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mb_tc_fun</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead_maybe</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">args</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">mb_res_ty</span></span></span>
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<pre style="margin: 0;"> <span id="LC347" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_tc_fun</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC348" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">fun'</span><span class="p">,</span> <span class="n" style="color: #333;">fun_sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">fun'</span><span class="p">,</span> <span class="n" style="color: #333;">fun_sigma</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addExprCtxt</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="haskell"> <span class="n" style="color: #333;">tcInfer</span> <span class="p">(</span><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tcInfer</span> <span class="p">(</span><span class="n" style="color: #333;">tcExpr</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAppHead_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">-<span id="LC351" 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;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC352" 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;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These two args are solely for tcInferRecSelId</span></span>
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<pre style="margin: 0;"> <span id="LC354" 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;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">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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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns Nothing for a complicated head</span></span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAppHead_maybe</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAppHead_maybe</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">args</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">mb_res_ty</span></span></span>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">fun</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">nm</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">tcInferId</span> <span class="n" style="color: #333;">nm</span></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">tcInferRecSelId</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC358" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ExprWithTySig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isCompleteHsSig</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">exprCtxt</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">tcInferRecSelId</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">mb_res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC360" 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_ctxt</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">tcExprWithSig</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"> <span class="n" style="color: #333;">add_ctxt</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">thing_inside</span> <span class="c1" style="color: #998; font-style: italic;">-- We havea already pushed the context</span></span>
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addExprCtxt</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC367" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC368" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC369" 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">@@ -456,40 +461,20 @@ non-obvious ways.</td>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [HsRecField and HsRecUpdField] in GHC.Hs.Pat.</span></span>
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<pre style="margin: 0;"> <span id="LC462" 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="LC463" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC459" 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>
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<pre style="margin: 0;">-<span id="LC460" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC461" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckRecSelId</span> <span class="n" style="color: #333;">rn_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unambiguous</span> <span class="n" style="color: #333;">sel_name</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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<pre style="margin: 0;">-<span id="LC462" 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;">sel_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_rec_sel_id</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">sel_name</span></span>
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<pre style="margin: 0;">-<span id="LC463" 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;">HsRecFld</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unambiguous</span> <span class="n" style="color: #333;">sel_id</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC464" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcWrapResult</span> <span class="n" style="color: #333;">rn_expr</span> <span class="n" style="color: #333;">expr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">sel_id</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC465" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckRecSelId</span> <span class="n" style="color: #333;">rn_expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ambiguous</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC466" 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;">tcSplitFunTy_maybe</span> <span class="o" style="font-weight: 600;">=<<</span> <span class="n" style="color: #333;">checkingExpType_maybe</span> <span class="n" style="color: #333;">res_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC467" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ambiguousSelector</span> <span class="n" style="color: #333;">lbl</span></span>
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<pre style="margin: 0;">-<span id="LC468" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">arg</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="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sel_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">disambiguateSelector</span> <span class="n" style="color: #333;">lbl</span> <span class="p">(</span><span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC469" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">sel_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_rec_sel_id</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">sel_name</span></span>
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<pre style="margin: 0;">-<span id="LC470" 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;">HsRecFld</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ambiguous</span> <span class="n" style="color: #333;">sel_id</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC471" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcWrapResult</span> <span class="n" style="color: #333;">rn_expr</span> <span class="n" style="color: #333;">expr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">sel_id</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC472" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC473" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRecSelId</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC464" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRecSelId</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>
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<pre style="margin: 0;">+<span id="LC465" 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;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span></span>
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<pre style="margin: 0;"> <span id="LC466" 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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<pre style="margin: 0;">-<span id="LC475" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Disgusting special case for ambiguous record selectors</span></span>
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<pre style="margin: 0;">-<span id="LC476" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRecSelId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ambiguous</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC477" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arg1</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dropWhile</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isVisibleArg</span><span class="p">)</span> <span class="n" style="color: #333;">args</span> <span class="c1" style="color: #998; font-style: italic;">-- A value arg is first</span></span>
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<pre style="margin: 0;">-<span id="LC478" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="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;">arg</span><span class="p">)</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">arg1</span></span>
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<pre style="margin: 0;">-<span id="LC479" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">obviousSig</span> <span class="n" style="color: #333;">arg</span> <span class="c1" style="color: #998; font-style: italic;">-- A type sig on the arg disambiguates</span></span>
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<pre style="margin: 0;">-<span id="LC480" 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_tc_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;">-<span id="LC481" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">sel_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">disambiguateSelector</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">sig_tc_ty</span></span>
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<pre style="margin: 0;">-<span id="LC482" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">sel_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_rec_sel_id</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">sel_name</span></span>
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<pre style="margin: 0;">-<span id="LC483" 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;">HsRecFld</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ambiguous</span> <span class="n" style="color: #333;">sel_id</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC484" 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;">expr</span><span class="p">,</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">sel_id</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC485" 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="LC486" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ambiguousSelector</span> <span class="n" style="color: #333;">lbl</span></span>
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<pre style="margin: 0;">-<span id="LC487" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC488" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRecSelId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unambiguous</span> <span class="n" style="color: #333;">sel_name</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span> <span class="n" style="color: #333;">_args</span></span>
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<pre style="margin: 0;">+<span id="LC467" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRecSelId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unambiguous</span> <span class="n" style="color: #333;">sel_name</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span> <span class="n" style="color: #333;">_args</span> <span class="n" style="color: #333;">_mb_res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sel_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_rec_sel_id</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">sel_name</span></span>
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<pre style="margin: 0;"> <span id="LC469" 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;">HsRecFld</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unambiguous</span> <span class="n" style="color: #333;">sel_id</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC470" 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;">expr</span><span class="p">,</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">sel_id</span><span class="p">)</span> <span class="p">}</span></span>
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471
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC472" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRecSelId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ambiguous</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">mb_res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC473" 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;">sel_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAmbiguousRecSelId</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">mb_res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC474" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">sel_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_rec_sel_id</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">sel_name</span></span>
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<pre style="margin: 0;">+<span id="LC475" 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;">HsRecFld</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ambiguous</span> <span class="n" style="color: #333;">sel_id</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC476" 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;">expr</span><span class="p">,</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">sel_id</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC477" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC478" 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="LC479" class="line" lang="haskell"><span class="n" style="color: #333;">tc_rec_sel_id</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Name</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;">TcId</span></span>
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<pre style="margin: 0;"> <span id="LC480" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Like tc_infer_id, but returns an Id not a HsExpr,</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">@@ -498,13 +483,11 @@ tc_rec_sel_id lbl sel_name</td>
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<pre style="margin: 0;"> <span id="LC483" 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;">thing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLookup</span> <span class="n" style="color: #333;">sel_name</span></span>
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<pre style="margin: 0;"> <span id="LC484" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">thing</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC485" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATcId</span> <span class="p">{</span> <span class="n" style="color: #333;">tct_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">id</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC501" 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;">check_naughty</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Local record selectors]</span></span>
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<pre style="margin: 0;">-<span id="LC502" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkThLocalId</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">-<span id="LC503" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcEmitBindingUsage</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unitUE</span> <span class="n" style="color: #333;">sel_name</span> <span class="kt" style="color: #458; font-weight: 600;">One</span></span>
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<pre style="margin: 0;">+<span id="LC486" 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;">check_local_id</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">id</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC488" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AGlobal</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AnId</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC507" 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;">check_<span class="idiff left right">naughty</span></span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC490" 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;">check_<span class="idiff left right">global_id</span></span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span></span>
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491
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">id</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A global cannot possibly be ill-staged</span></span>
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- nor does it need the 'lifting' treatment</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">@@ -515,28 +498,44 @@ tc_rec_sel_id lbl sel_name</td>
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498
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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499
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rdrNameOcc</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC518" class="line" lang="haskell"><span class="n" style="color: #333;">check_naughty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC519" class="line" lang="haskell"><span class="n" style="color: #333;">check_naughty</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">-<span id="LC520" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNaughtyRecordSelector</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">failWithTc</span> <span class="p">(</span><span class="n" style="color: #333;">naughtyRecordSel</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC521" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC522" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC501" 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="LC502" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAmbiguousRecSelId</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span></span>
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503
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<pre style="margin: 0;">+<span id="LC503" 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;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span></span>
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Disgusting special case for ambiguous record selectors</span></span>
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Given a RdrName that refers to multiple record fields, and the type</span></span>
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of its argument, try to determine the name of the selector that is</span></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- meant.</span></span>
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Disambiguating record fields]</span></span>
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<pre style="margin: 0;">-<span id="LC528" class="line" lang="haskell"><span class="n" style="color: #333;">disambiguateSelector</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</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;">Name</span></span>
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<pre style="margin: 0;">-<span id="LC529" class="line" lang="haskell"><span class="n" style="color: #333;">disambiguateSelector</span> <span class="n" style="color: #333;">lr</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="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">rdr</span><span class="p">)</span> <span class="n" style="color: #333;">parent_type</span></span>
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<pre style="margin: 0;">+<span id="LC510" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferAmbiguousRecSelId</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">mb_res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">arg1</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dropWhile</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isVisibleArg</span><span class="p">)</span> <span class="n" style="color: #333;">args</span> <span class="c1" style="color: #998; font-style: italic;">-- A value arg is first</span></span>
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="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;">arg</span><span class="p">)</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">arg1</span></span>
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">obviousSig</span> <span class="n" style="color: #333;">arg</span> <span class="c1" style="color: #998; font-style: italic;">-- A type sig on the arg disambiguates</span></span>
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<pre style="margin: 0;">+<span id="LC514" 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_tc_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">finish_ambiguous_selector</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">sig_tc_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC517" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mb_res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">arg_ty</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;">tcSplitFunTy_maybe</span> <span class="n" style="color: #333;">res_ty</span></span>
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519
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<pre style="margin: 0;">+<span id="LC519" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">finish_ambiguous_selector</span> <span class="n" style="color: #333;">lbl</span> <span class="p">(</span><span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ambiguousSelector</span> <span class="n" style="color: #333;">lbl</span></span>
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"><span class="n" style="color: #333;">finish_ambiguous_selector</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</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;">Name</span></span>
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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell"><span class="n" style="color: #333;">finish_ambiguous_selector</span> <span class="n" style="color: #333;">lr</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="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">rdr</span><span class="p">)</span> <span class="n" style="color: #333;">parent_type</span></span>
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<pre style="margin: 0;"> <span id="LC526" 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;">fam_inst_envs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcGetFamInstEnvs</span></span>
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<pre style="margin: 0;">-<span id="LC531" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tyConOf</span> <span class="n" style="color: #333;">fam_inst_envs</span> <span class="n" style="color: #333;">parent_type</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC532" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ambiguousSelector</span> <span class="n" style="color: #333;">lr</span></span>
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tyConOf</span> <span class="n" style="color: #333;">fam_inst_envs</span> <span class="n" style="color: #333;">parent_type</span> <span class="kr" style="font-weight: 600;">of</span><span class="idiff left"> </span><span class="p"><span class="idiff right">{</span></span></span>
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ambiguousSelector</span> <span class="n" style="color: #333;">lr</span><span class="idiff left"> </span><span class="p"><span class="idiff right">;</span></span></span>
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC534" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupParents</span> <span class="n" style="color: #333;">rdr</span></span>
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<pre style="margin: 0;">-<span id="LC535" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">parent</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RecSelData</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">-<span id="LC536" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookup</span> <span class="n" style="color: #333;">parent</span> <span class="n" style="color: #333;">xs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">gre</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;">addUsedGRE</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">gre</span></span>
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<pre style="margin: 0;">-<span id="LC538" 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;">gre_name</span> <span class="n" style="color: #333;">gre</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failWithTc</span> <span class="p">(</span><span class="n" style="color: #333;">fieldNotInType</span> <span class="n" style="color: #333;">parent</span> <span class="n" style="color: #333;">rdr</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupParents</span> <span class="n" style="color: #333;">rdr</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">parent</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RecSelData</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookup</span> <span class="n" style="color: #333;">parent</span> <span class="n" style="color: #333;">xs</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failWithTc</span> <span class="p">(</span><span class="n" style="color: #333;">fieldNotInType</span> <span class="n" style="color: #333;">parent</span> <span class="n" style="color: #333;">rdr</span><span class="p">)</span> <span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">gre</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">addUsedGRE</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">gre</span></span>
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<pre style="margin: 0;">+<span id="LC538" 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;">gre_name</span> <span class="n" style="color: #333;">gre</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span> <span class="p">}</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC540" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This field name really is ambiguous, so add a suitable "ambiguous</span></span>
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541
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- occurrence" error, then give up.</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">@@ -608,6 +607,101 @@ naughtyRecordSel lbl</td>
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608
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Probable fix: use pattern-matching syntax instead"</span></span>
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609
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608
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"></span>
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609
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC610" 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="LC611" 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="LC612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Expressions with a type signature</span></span>
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<pre style="margin: 0;">+<span id="LC613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> expr :: type</span></span>
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614
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<pre style="margin: 0;">+<span id="LC614" 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="LC615" 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="LC616" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC617" 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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618
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<pre style="margin: 0;">+<span id="LC618" 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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619
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<pre style="margin: 0;">+<span id="LC619" 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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620
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<pre style="margin: 0;">+<span id="LC620" 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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621
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<pre style="margin: 0;">+<span id="LC621" 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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622
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<pre style="margin: 0;">+<span id="LC622" 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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623
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<pre style="margin: 0;">+<span id="LC623" 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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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC625" 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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626
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"><span class="n" style="color: #333;">tcExprSig</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;">TcIdSigInfo</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;">GhcTc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>
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628
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"><span class="n" style="color: #333;">tcExprSig</span> <span class="n" style="color: #333;">expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CompleteSig</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">poly_id</span><span class="p">,</span> <span class="n" style="color: #333;">sig_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span></span>
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629
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<pre style="margin: 0;">+<span id="LC629" 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 class="c1" style="color: #998; font-style: italic;">-- Sets the location for the implication constraint</span></span>
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630
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<pre style="margin: 0;">+<span id="LC630" 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;">poly_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">poly_id</span></span>
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631
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<pre style="margin: 0;">+<span id="LC631" 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;">expr'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSkolemiseScoped</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="n" style="color: #333;">poly_ty</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;">rho_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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632
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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"> <span class="n" style="color: #333;">tcCheckMonoExprNC</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">rho_ty</span></span>
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633
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="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;">poly_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"><span class="n" style="color: #333;">tcExprSig</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PartialSig</span> <span class="p">{</span> <span class="n" style="color: #333;">psig_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">sig_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC636" 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 class="c1" style="color: #998; font-style: italic;">-- Sets the location for the implication constraint</span></span>
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637
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<pre style="margin: 0;">+<span id="LC637" 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;">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;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">))</span></span>
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638
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<pre style="margin: 0;">+<span id="LC638" 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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639
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<pre style="margin: 0;">+<span id="LC639" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_inst</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstSig</span> <span class="n" style="color: #333;">sig</span></span>
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640
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcExtendNameTyVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">mapSnd</span> <span class="n" style="color: #333;">binderVar</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">sig_inst_skols</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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641
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"> <span class="n" style="color: #333;">tcExtendNameTyVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">sig_inst_wcs</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"> <span class="n" style="color: #333;">tcCheckPolyExprNC</span> <span class="n" style="color: #333;">expr</span> <span class="p">(</span><span class="n" style="color: #333;">sig_inst_tau</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC643" 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;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Partial expression signatures]</span></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tau</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_inst_tau</span> <span class="n" style="color: #333;">sig_inst</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"> <span class="n" style="color: #333;">infer_mode</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">sig_inst_theta</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isNothing</span> <span class="p">(</span><span class="n" style="color: #333;">sig_inst_wcx</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ApplyMR</span></span>
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoRestrictions</span></span>
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">qtvs</span><span class="p">,</span> <span class="n" style="color: #333;">givens</span><span class="p">,</span> <span class="n" style="color: #333;">ev_binds</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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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplifyInfer</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">infer_mode</span> <span class="p">[</span><span class="n" style="color: #333;">sig_inst</span><span class="p">]</span> <span class="p">[(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)]</span> <span class="n" style="color: #333;">wanted</span></span>
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitConstraints</span> <span class="n" style="color: #333;">residual</span></span>
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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tau</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">tau</span></span>
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inferred_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">evVarPred</span> <span class="n" style="color: #333;">givens</span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"> <span class="n" style="color: #333;">tau_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">tau</span></span>
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658
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">binders</span><span class="p">,</span> <span class="n" style="color: #333;">my_theta</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">chooseInferredQuantifiers</span> <span class="n" style="color: #333;">inferred_theta</span></span>
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659
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<pre style="margin: 0;">+<span id="LC659" class="line" lang="haskell"> <span class="n" style="color: #333;">tau_tvs</span> <span class="n" style="color: #333;">qtvs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">sig_inst</span><span class="p">)</span></span>
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660
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inferred_sigma</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInfSigmaTy</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">inferred_theta</span> <span class="n" style="color: #333;">tau</span></span>
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661
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"> <span class="n" style="color: #333;">my_sigma</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInvisForAllTys</span> <span class="n" style="color: #333;">binders</span> <span class="p">(</span><span class="n" style="color: #333;">mkPhiTy</span> <span class="n" style="color: #333;">my_theta</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC662" 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="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">inferred_sigma</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">my_sigma</span> <span class="c1" style="color: #998; font-style: italic;">-- NB: eqType ignores vis.</span></span>
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<pre style="margin: 0;">+<span id="LC663" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">idHsWrapper</span> <span class="c1" style="color: #998; font-style: italic;">-- Fast path; also avoids complaint when we infer</span></span>
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<pre style="margin: 0;">+<span id="LC664" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- an ambiguous type and have AllowAmbiguousType</span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e..g infer x :: forall a. F a -> Int</span></span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">tcSubTypeSigma</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="n" style="color: #333;">inferred_sigma</span> <span class="n" style="color: #333;">my_sigma</span></span>
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<pre style="margin: 0;">+<span id="LC667" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC668" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcExpSig"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">qtvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">givens</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inferred_sigma</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">my_sigma</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">poly_wrap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrap</span></span>
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<pre style="margin: 0;">+<span id="LC670" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpTyLams</span> <span class="n" style="color: #333;">qtvs</span></span>
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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpLams</span> <span class="n" style="color: #333;">givens</span></span>
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpLet</span> <span class="n" style="color: #333;">ev_binds</span></span>
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<pre style="margin: 0;">+<span id="LC673" 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;">poly_wrap</span> <span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">my_sigma</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC674" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC675" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Partial expression signatures]</span></span>
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<pre style="margin: 0;">+<span id="LC677" 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="LC678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Partial type signatures on expressions are easy to get wrong. But</span></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;">here is a guiding principile</span></span>
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680
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> e :: ty</span></span>
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681
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">should behave like</span></span>
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682
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let x :: ty</span></span>
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683
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x = e</span></span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in x</span></span>
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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="cm" style="color: #998; font-style: italic;">So for partial signatures we apply the MR if no context is given. So</span></span>
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> e :: IO _ apply the MR</span></span>
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688
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> e :: _ => IO _ do not apply the MR</span></span>
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689
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">just like in GHC.Tc.Gen.Bind.decideGeneralisationPlan</span></span>
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690
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"></span>
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691
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This makes a difference (#11670):</span></span>
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692
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> peek :: Ptr a -> IO CLong</span></span>
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693
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> peek ptr = peekElemOff undefined 0 :: _</span></span>
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694
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from (peekElemOff undefined 0) we get</span></span>
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695
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type: IO w</span></span>
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696
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constraints: Storable w</span></span>
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697
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"></span>
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698
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We must NOT try to generalise over 'w' because the signature specifies</span></span>
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699
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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">no constraints so we'll complain about not being able to solve</span></span>
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700
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Storable w. Instead, don't generalise; then _ gets instantiated to</span></span>
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701
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<pre style="margin: 0;">+<span id="LC701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CLong, as it should.</span></span>
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702
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<pre style="margin: 0;">+<span id="LC702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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703
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"></span>
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704
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"></span>
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611
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705
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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612
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706
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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613
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707
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tcInferId, tcCheckId</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="747" 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">@@ -653,19 +747,12 @@ tc_infer_id id_name</td>
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653
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747
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<pre style="margin: 0;"> <span id="LC747" 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;">thing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLookup</span> <span class="n" style="color: #333;">id_name</span></span>
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<pre style="margin: 0;"> <span id="LC748" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">thing</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC749" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATcId</span> <span class="p">{</span> <span class="n" style="color: #333;">tct_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">id</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC656" 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;">check_naughty</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">-<span id="LC657" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [HsVar: naughty record selectors]</span></span>
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<pre style="margin: 0;">-<span id="LC658" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkThLocalId</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">-<span id="LC659" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcEmitBindingUsage</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unitUE</span> <span class="n" style="color: #333;">id_name</span> <span class="kt" style="color: #458; font-weight: 600;">One</span></span>
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<pre style="margin: 0;">+<span id="LC750" 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;">check_local_id</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC751" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return_id</span> <span class="n" style="color: #333;">id</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC752" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC753" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AGlobal</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AnId</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC663" 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;">check_naughty</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">-<span id="LC664" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [HsVar: naughty record selectors]</span></span>
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<pre style="margin: 0;">+<span id="LC754" 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;">check_global_id</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return_id</span> <span class="n" style="color: #333;">id</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC666" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A global cannot possibly be ill-staged</span></span>
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<pre style="margin: 0;">-<span id="LC667" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- nor does it need the 'lifting' treatment</span></span>
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<pre style="margin: 0;">-<span id="LC668" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hence no checkTh stuff here</span></span>
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC757" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AGlobal</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AConLike</span> <span class="n" style="color: #333;">cl</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;">cl</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC758" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return_data_con</span> <span class="n" style="color: #333;">con</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">@@ -725,6 +812,23 @@ tc_infer_id id_name</td>
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mkInvisForAllTys</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkInvisFunTysMany</span> <span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="n" style="color: #333;">scaled_arg_tys</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC813" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC815" class="line" lang="haskell"><span class="n" style="color: #333;">check_local_id</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC816" class="line" lang="haskell"><span class="n" style="color: #333;">check_local_id</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC817" 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;">check_naughty</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [HsVar: naughty record selectors]</span></span>
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<pre style="margin: 0;">+<span id="LC818" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkThLocalId</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC819" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcEmitBindingUsage</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unitUE</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">One</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC820" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC821" class="line" lang="haskell"><span class="n" style="color: #333;">check_global_id</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC822" class="line" lang="haskell"><span class="n" style="color: #333;">check_global_id</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC823" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">check_naughty</span> <span class="n" style="color: #333;">occ</span> <span class="n" style="color: #333;">id</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [HsVar: naughty record selectors]</span></span>
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A global cannot possibly be ill-staged</span></span>
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<pre style="margin: 0;">+<span id="LC825" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- nor does it need the 'lifting' treatment</span></span>
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Hence no checkTh stuff here</span></span>
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC828" class="line" lang="haskell"><span class="n" style="color: #333;">check_naughty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcId</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"><span class="n" style="color: #333;">check_naughty</span> <span class="n" style="color: #333;">lbl</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNaughtyRecordSelector</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">failWithTc</span> <span class="p">(</span><span class="n" style="color: #333;">naughtyRecordSel</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC831" 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;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"><span class="n" style="color: #333;">nonBidirectionalErr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">name</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>
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"><span class="n" style="color: #333;">nonBidirectionalErr</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">failWithTc</span> <span class="o" style="font-weight: 600;">$</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#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">@@ -267,11 +267,10 @@ kind-generalisation, is done by</td>
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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kindGeneraliseSome</span></span>
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kindGeneraliseNone</span></span>
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">perform kind generalisation. Here, we have to deal with the fact that</span></span>
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<pre style="margin: 0;">-<span id="LC271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">metatyvars generated in the type will have a bumped TcLevel, because</span></span>
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<pre style="margin: 0;">-<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">explicit foralls raise the TcLevel. To avoid these variables from ever</span></span>
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<pre style="margin: 0;">-<span id="LC273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">being visible in the surrounding context, we must obey the following</span></span>
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<pre style="margin: 0;">-<span id="LC274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dictum:</span></span>
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, we have to deal with the fact that metatyvars generated in the</span></span>
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type will have a bumped TcLevel, because explicit foralls raise the</span></span>
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">TcLevel. To avoid these variables from ever being visible in the</span></span>
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">surrounding context, we must obey the following dictum:</span></span>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Every metavariable in a type must either be</span></span>
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (A) generalized, or</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">@@ -1057,7 +1056,7 @@ tc_hs_type mode forall@(HsForAllTy { hst_tele = tele, hst_body = ty }) exp_kind</td>
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1057
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<pre style="margin: 0;"> <span id="LC1056" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">tv_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">ty'</span><span class="p">))</span></span>
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1058
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<pre style="margin: 0;"> <span id="LC1057" 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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1059
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<pre style="margin: 0;"> <span id="LC1058" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No need to solve equalities here; we will do that later</span></span>
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1060
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<pre style="margin: 0;">-<span id="LC1060" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKTele</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">tele</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1059" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKTele<span class="idiff left right">_Skol_M</span></span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">tele</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The _M variant passes on the mode from the type, to</span></span>
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<pre style="margin: 0;"> <span id="LC1061" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- any wildards in kind signatures on the forall'd variables</span></span>
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<pre style="margin: 0;"> <span id="LC1062" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. f :: _ -> Int -> forall (a :: _). blah</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3024,12 +3023,12 @@ cloneFlexiKindedTyVarTyVar = newFlexiKindedTyVar cloneTyVarTyVar</td>
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<pre style="margin: 0;"> <span id="LC3023" 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="LC3024" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3025" class="line" lang="haskell"><span class="cd">-- | Skolemise the 'HsTyVarBndr's in an 'LHsForAllTelescope.</span></span>
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<pre style="margin: 0;">-<span id="LC3027" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKTele</span></span>
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<pre style="margin: 0;">+<span id="LC3026" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKTele<span class="idiff left right">_Skol_M</span></span></span>
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<pre style="margin: 0;"> <span id="LC3027" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span></span>
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<pre style="margin: 0;"> <span id="LC3028" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsForAllTelescope</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;"> <span id="LC3029" 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="LC3030" 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;">TcTyVarBinder</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="LC3032" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKTele</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">tele</span> <span class="n" style="color: #333;">thing_inside</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tele</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC3031" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKTele<span class="idiff left right">_Skol_M</span></span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">tele</span> <span class="n" style="color: #333;">thing_inside</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tele</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC3032" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsForAllVis</span> <span class="p">{</span> <span class="n" style="color: #333;">hsf_vis_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC3033" 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;">req_tv_bndrs</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;">bindExplicitTKBndrs_Skol_M</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC3034" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- req_tv_bndrs :: [VarBndr TyVar ()],</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#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">@@ -2631,7 +2631,7 @@ https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0179-printi</td>
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<pre style="margin: 0;"> <span id="LC2631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> re-generalising, as discussed in #11376.</span></span>
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<pre style="margin: 0;"> <span id="LC2632" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> > :type reverse</span></span>
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<pre style="margin: 0;">-<span id="LC2634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> reverse :: forall a. <span class="idiff left right">a -> a</span></span></span>
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<pre style="margin: 0;">+<span id="LC2634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> reverse :: forall a. <span class="idiff left right">[a] -> [a]</span></span></span>
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<pre style="margin: 0;"> <span id="LC2635" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- foo :: forall a f b. (Show a, Num b, Foldable f) => a -> f b -> String</span></span>
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<pre style="margin: 0;"> <span id="LC2637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> > :type +v foo @Int</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -159,6 +159,8 @@ simplifyTop wanteds</td>
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"><span class="n" style="color: #333;">pushLevelAndSolveEqualities</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemInfo</span> <span class="o" style="font-weight: 600;">-></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;">TcM</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;">a</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Push level, and solve all resulting equalities</span></span>
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If there are any unsolved equalities, report them</span></span>
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and fail (in the monad)</span></span>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"><span class="n" style="color: #333;">pushLevelAndSolveEqualities</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelAndSolveEqualitiesX</span></span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"> <span class="s" style="color: #d14;">"pushLevelAndSolveEqualities"</span> <span class="n" style="color: #333;">thing_inside</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">@@ -167,6 +169,9 @@ pushLevelAndSolveEqualities skol_info skol_tvs thing_inside</td>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"><span class="n" style="color: #333;">pushLevelAndSolveEqualitiesX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</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>
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<pre style="margin: 0;"> <span id="LC171" 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;">TcLevel</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</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="LC172" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Push the level, gather equality constraints, and then solve them.</span></span>
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns any remaining unsolved equalities.</span></span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does not report errors.</span></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"><span class="n" style="color: #333;">pushLevelAndSolveEqualitiesX</span> <span class="n" style="color: #333;">callsite</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC176" 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;">"pushLevelAndSolveEqualitiesX {"</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Called from"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">callsite</span><span class="p">)</span></span>
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177
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<pre style="margin: 0;"> <span id="LC177" 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="p">(</span><span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="n" style="color: #333;">res</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">@@ -180,7 +185,7 @@ pushLevelAndSolveEqualitiesX callsite thing_inside</td>
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185
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"></span>
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181
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186
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"><span class="cd">-- | Type-check a thing that emits only equality constraints, solving any</span></span>
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182
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187
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constraints we can and re-emitting constraints that we can't.</span></span>
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183
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">W</span>e'll get another crack at it later</span></span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Use this variant only when w</span>e'll get another crack at it later</span></span>
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184
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Failure in local type signatures]</span></span>
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185
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"><span class="n" style="color: #333;">solveEqualities</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</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="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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191
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"><span class="n" style="color: #333;">solveEqualities</span> <span class="n" style="color: #333;">callsite</span> <span class="n" style="color: #333;">thing_inside</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">@@ -347,6 +352,9 @@ See also #18062, #11506</td>
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352
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="haskell"><span class="n" style="color: #333;">reportUnsolvedEqualities</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemInfo</span> <span class="o" style="font-weight: 600;">-></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;">TcLevel</span></span>
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349
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<pre style="margin: 0;"> <span id="LC354" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Reports all unsolved wanteds provided; fails in the monad if there are any.</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The provided SkolemInfo and [TcTyVar] arguments are used in an implication to</span></span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- provide skolem info for any errors.</span></span>
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350
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell"><span class="n" style="color: #333;">reportUnsolvedEqualities</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">wanted</span></span>
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351
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyWC</span> <span class="n" style="color: #333;">wanted</span></span>
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352
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2378" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2370,7 +2378,7 @@ beta! Concrete example is in indexed_types/should_fail/ExtraTcsUntch.hs:</td>
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2370
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<pre style="margin: 0;"> <span id="LC2378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h :: F Int -> ()</span></span>
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2379
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<pre style="margin: 0;"> <span id="LC2379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h = undefined</span></span>
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2372
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2380
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<pre style="margin: 0;"> <span id="LC2380" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">o</span> data TEx where</span></span>
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2381
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<pre style="margin: 0;">+<span id="LC2381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data TEx where</span></span>
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2382
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<pre style="margin: 0;"> <span id="LC2382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TEx :: a -> TEx</span></span>
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2383
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<pre style="margin: 0;"> <span id="LC2383" class="line" lang="haskell"></span>
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2384
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<pre style="margin: 0;"> <span id="LC2384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (x::beta) =</span></span>
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<li id="83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca"><strong>compiler/GHC/Tc/TyCl.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -58,6 +58,7 @@ import GHC.Core.Class</td>
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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.Core.Coercion.Axiom</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</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.Core.DataCon</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.Hs.Decls</span><span class="p">(</span> <span class="n" style="color: #333;">newOrDataToFlavour</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</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;">GHC.Types.Var.Env</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">@@ -2317,7 +2318,7 @@ tcClassDecl1 roles_info class_name hs_ctxt meths fundeps sigs ats at_defs</td>
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2317
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<pre style="margin: 0;"> <span id="LC2318" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">fds</span><span class="p">,</span> <span class="n" style="color: #333;">sig_stuff</span><span class="p">,</span> <span class="n" style="color: #333;">at_stuff</span><span class="p">)</span> <span class="p">}</span></span>
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2319
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<pre style="margin: 0;"> <span id="LC2319" class="line" lang="haskell"></span>
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2319
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2320
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<pre style="margin: 0;"> <span id="LC2320" class="line" lang="haskell"></span>
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2320
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<pre style="margin: 0;">-<span id="LC2320" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The <span class="idiff left right">reportUnsolved</span>Equalities will report errors for any</span></span>
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2321
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<pre style="margin: 0;">+<span id="LC2321" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The <span class="idiff left right">pushLevelAndSolve</span>Equalities will report errors for any</span></span>
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2321
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2322
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<pre style="margin: 0;"> <span id="LC2322" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unsolved equalities, so these zonks should not encounter</span></span>
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2322
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2323
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<pre style="margin: 0;"> <span id="LC2323" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- any unfilled coercion variables unless there is such an error</span></span>
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2323
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<pre style="margin: 0;"> <span id="LC2324" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The zonk also squeeze out the TcTyCons, and converts</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">@@ -2795,8 +2796,7 @@ tcDataDefn err_ctxt roles_info tc_name</td>
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2796
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<pre style="margin: 0;"> <span id="LC2796" 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;">tycon</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">deriv_info</span><span class="p">])</span> <span class="p">}</span></span>
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2797
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<pre style="margin: 0;"> <span id="LC2797" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2798
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<pre style="margin: 0;"> <span id="LC2798" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyConSkol</span> <span class="n" style="color: #333;">flav</span> <span class="n" style="color: #333;">tc_name</span></span>
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2798
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<pre style="margin: 0;">-<span id="LC2798" class="line" lang="haskell"> <span class="n" style="color: #333;">flav</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">new_or_data</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">NewType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NewtypeFlavour</span></span>
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2799
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<pre style="margin: 0;">-<span id="LC2799" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">DataType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DataTypeFlavour</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2799" class="line" lang="haskell"> <span class="n" style="color: #333;">flav</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newOrDataToFlavour</span> <span class="n" style="color: #333;">new_or_data</span></span>
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2800
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<pre style="margin: 0;"> <span id="LC2800" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2801" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Abstract data types in hsig files can have arbitrary kinds,</span></span>
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2802
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<pre style="margin: 0;"> <span id="LC2802" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because they may be implemented by type synonyms</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">@@ -3305,12 +3305,12 @@ tcConDecl rep_tycon tag_map tmpl_bndrs _res_kind res_tmpl new_or_data</td>
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3305
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<pre style="margin: 0;"> <span id="LC3305" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">imp_tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">exp_tvbndrs</span></span>
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3306
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<pre style="margin: 0;"> <span id="LC3306" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">reportUnsolvedEqualities</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">wanted</span></span>
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3307
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<pre style="margin: 0;"> <span id="LC3307" class="line" lang="haskell"></span>
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3308
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<pre style="margin: 0;">-<span id="LC3308" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left right">fake</span>_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSpecForAllTys</span> <span class="n" style="color: #333;">imp_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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3309
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<pre style="margin: 0;">-<span id="LC3309" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">mkInvisForAllTys</span> <span class="n" style="color: #333;">exp_tvbndrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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3310
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<pre style="margin: 0;">-<span id="LC3310" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">mkPhiTy</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">$</span></span>
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3311
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<pre style="margin: 0;">-<span id="LC3311" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">mkVisFunTys</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">$</span></span>
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3312
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<pre style="margin: 0;">-<span id="LC3312" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">res_ty</span></span>
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3313
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<pre style="margin: 0;">-<span id="LC3313" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tkvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">kindGeneralizeAll</span> <span class="n" style="color: #333;"><span class="idiff left right">fake</span>_ty</span></span>
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<pre style="margin: 0;">+<span id="LC3308" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left right">con</span>_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSpecForAllTys</span> <span class="n" style="color: #333;">imp_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC3309" class="line" lang="haskell"> <span class="n" style="color: #333;">mkInvisForAllTys</span> <span class="n" style="color: #333;">exp_tvbndrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC3310" class="line" lang="haskell"> <span class="n" style="color: #333;">mkPhiTy</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC3311" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC3312" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC3313" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tkvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">kindGeneralizeAll</span> <span class="n" style="color: #333;"><span class="idiff left right">con</span>_ty</span></span>
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<pre style="margin: 0;"> <span id="LC3314" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3315" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tvbndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarBinders</span> <span class="kt" style="color: #458; font-weight: 600;">InferredSpec</span> <span class="n" style="color: #333;">tkvs</span></span>
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<pre style="margin: 0;"> <span id="LC3316" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">mkTyVarBinders</span> <span class="kt" style="color: #458; font-weight: 600;">SpecifiedSpec</span> <span class="n" style="color: #333;">imp_tvs</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -969,6 +969,8 @@ addHoles wc holes</td>
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<pre style="margin: 0;"> <span id="LC969" class="line" lang="haskell"><span class="n" style="color: #333;">dropMisleading</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;"> <span id="LC970" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Drop misleading constraints; really just class constraints</span></span>
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Constraints and errors] in GHC.Tc.Utils.Monad</span></span>
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<pre style="margin: 0;">+<span id="LC972" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for why this function is so strange, treating the 'simples'</span></span>
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and the implications differently. Sigh.</span></span>
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<pre style="margin: 0;"> <span id="LC974" class="line" lang="haskell"><span class="n" style="color: #333;">dropMisleading</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span><span class="p">,</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC975" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterBag</span> <span class="n" style="color: #333;">insolubleCt</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;"> <span id="LC976" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapBag</span> <span class="n" style="color: #333;">drop_implic</span> <span class="n" style="color: #333;">implics</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb"><strong>compiler/GHC/Tc/Utils/TcMType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -468,7 +468,7 @@ readExpType exp_ty</td>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"><span class="cd">-- | Returns the expected type when in checking mode.</span></span>
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<pre style="margin: 0;"> <span id="LC469" class="line" lang="haskell"><span class="n" style="color: #333;">checkingExpType_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ExpType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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<pre style="margin: 0;"> <span id="LC470" class="line" lang="haskell"><span class="n" style="color: #333;">checkingExpType_maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Check</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC471" class="line" lang="haskell"><span class="n" style="color: #333;">checkingExpType_maybe</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC471" class="line" lang="haskell"><span class="n" style="color: #333;">checkingExpType_maybe</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Infer</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">{})</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC473" class="line" lang="haskell"><span class="cd">-- | Returns the expected type when in checking mode. Panics if in inference</span></span>
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<pre style="margin: 0;"> <span id="LC474" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mode.</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">@@ -1646,11 +1646,11 @@ alpha[1] and beta[2]? Their levels. beta[2] has the right TcLevel for</td>
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<pre style="margin: 0;"> <span id="LC1646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">generalisation, and so we generalise it. alpha[1] does not, and so</span></span>
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<pre style="margin: 0;"> <span id="LC1647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we leave it alone.</span></span>
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<pre style="margin: 0;"> <span id="LC1648" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that not *every* variable with a higher level will get<span class="idiff left right"> generalised,</span></span></span>
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<pre style="margin: 0;">-<span id="LC1650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">either due to the monomorphism restriction or other quirks. See, fo</span>r</span></span>
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<pre style="margin: 0;">-<span id="LC1651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">example, the code in GHC.Tc.Solver.decideMonoTyVars and in</span></span></span>
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<pre style="margin: 0;">-<span id="LC1652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">GHC.Tc.Gen.HsType.kindGeneralize, both of which exclude certain otherwise-eligibl</span>e</span></span>
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<pre style="margin: 0;">-<span id="LC1653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables from being generalised.</span></span>
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<pre style="margin: 0;">+<span id="LC1649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that not *every* variable with a higher level will get</span></span>
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<pre style="margin: 0;">+<span id="LC1650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">generalised, either due to the monomorphism restriction or othe</span>r</span></span>
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<pre style="margin: 0;">+<span id="LC1651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">quirks. See, for example, the code in GHC.Tc.Solver.decideMonoTyVars</span></span></span>
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<pre style="margin: 0;">+<span id="LC1652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">and in GHC.Tc.Gen.HsType.kindGeneralizeSome, both of which exclud</span>e</span></span>
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<pre style="margin: 0;">+<span id="LC1653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">certain otherwise-eligible </span>variables from being generalised.</span></span>
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<pre style="margin: 0;"> <span id="LC1654" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Using level numbers for quantification is implemented in the candidateQTyVars...</span></span>
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<pre style="margin: 0;"> <span id="LC1656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">functions, by adding only those variables with a level strictly higher than</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">@@ -1690,7 +1690,7 @@ quantifyTyVars dvs@(DV{ dv_kvs = dep_tkvs, dv_tvs = nondep_tkvs })</td>
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<pre style="margin: 0;"> <span id="LC1690" 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="LC1691" 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;">"quantifyTyVars {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">dvs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1692" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1693" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">!</span></span><span class="p">(</span><span class="n" style="color: #333;">dep_kvs</span><span class="p">,</span> <span class="n" style="color: #333;">nondep_tvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">candidateKiTyVars</span> <span class="n" style="color: #333;">dvs</span></span>
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<pre style="margin: 0;">+<span id="LC1693" 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;">dep_kvs</span><span class="p">,</span> <span class="n" style="color: #333;">nondep_tvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">candidateKiTyVars</span> <span class="n" style="color: #333;">dvs</span></span>
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<pre style="margin: 0;"> <span id="LC1694" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1695" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In the non-PolyKinds case, default the kind variables</span></span>
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<pre style="margin: 0;"> <span id="LC1696" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to *, and zonk the tyvars as usual. Notice that this</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">@@ -25,7 +25,7 @@ instantiate ``id``\'s type with ``b := (forall s. ST s a) -> a``, and</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext">that is not allowed. Instantiating polymorphic type variables with</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext">polymorphic types is called *impredicative polymorphism*.</span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="plaintext">GHC has robut support for *impredicative polymorphism*,</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext">GHC has robu<span class="idiff left right">s</span>t support for *impredicative polymorphism*,</span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext">enabled with :extension:`ImpredicativeTypes`, using the so-called Quick Look</span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext">inference algorithm. It is described in the paper</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext">`A quick look at impredicativity</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">@@ -38,7 +38,7 @@ Switching on :extension:`ImpredicativeTypes`</td>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext"> For example ``f :: Maybe (forall a. [a] -> [a])`` is a legal type signature.</span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext">- Switches on the Quick Look type inference algorithm, as described</span>
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<pre style="margin: 0;">-<span id="LC41" class="line" lang="plaintext"> in the paper. Th<span class="idiff left right">e allow</span> the compiler to infer impredicative instantiations of polymorphic</span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext"> in the paper. Th<span class="idiff left right">is allows</span> the compiler to infer impredicative instantiations of polymorphic</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext"> functions in many cases. For example, ``reverse xs`` will typecheck even if ``xs :: [forall a. a->a]``,</span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext"> by instantiating ``reverse`` at type ``forall a. a->a``.</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#b02c1c6109c60b8f685234b0dbaabf6c79fed2a2"><strong>docs/users_guide/ghci.rst</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2975,11 +2975,6 @@ commonly used commands.</td>
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<pre style="margin: 0;"> <span id="LC2975" class="line" lang="plaintext"> *X> :type length</span>
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<pre style="margin: 0;"> <span id="LC2976" class="line" lang="plaintext"> length :: Foldable t => t a -> Int</span>
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<pre style="margin: 0;"> <span id="LC2977" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2978" class="line" lang="plaintext">.. ghci-cmd:: :type +v; ⟨expression⟩</span>
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<pre style="margin: 0;">-<span id="LC2979" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2980" class="line" lang="plaintext"> Infers and prints the type of ⟨expression⟩, binding inferred type variables</span>
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<pre style="margin: 0;">-<span id="LC2981" class="line" lang="plaintext"> with :ref:`*specified* visibility <inferred-vs-specified>`.</span>
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<pre style="margin: 0;">-<span id="LC2982" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2978" class="line" lang="plaintext">.. ghci-cmd:: :type +d; ⟨expression⟩</span>
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<pre style="margin: 0;"> <span id="LC2979" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2980" class="line" lang="plaintext"> Infers and prints the type of ⟨expression⟩, instantiating *all* the forall</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#fa8150a02afc8d7030a5c769256631c5d43f9d76"><strong>testsuite/tests/impredicative/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -19,3 +19,4 @@ test('T9730', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T7026</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T8808</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17332</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">expr-sig</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/a6ee690e7828d95e174c422ac13df70a1d25e27a...4c56d0afda9fe4741fc3aaf2539cd3d6ba87eb00#d5a401f1b48d9df07273f583f83ca7f23ef54ae7"><strong>testsuite/tests/impredicative/expr-sig.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ImpredicativeTypes, RankNTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">ExprSig</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">error</span> <span class="s" style="color: #d14;">"urk"</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">g1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">undefined</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This should be accepted (and wasn't)</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">g2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">undefined</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">f3</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">-></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;">b</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">f3</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">error</span> <span class="s" style="color: #d14;">"urk"</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">g3</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f3</span> <span class="p">(</span><span class="n" style="color: #333;">undefined</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span></pre>
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