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<h3>
Richard Eisenberg pushed to branch wip/derived-refactor
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9">f550eed8</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-09-18T17:49:50-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Actually checkpoint properly.
</pre>
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<h4>19 changed files:</h4>
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<li class="file-stats">
<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
compiler/GHC/Tc/Errors.hs
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<li class="file-stats">
<a href="#83f745d921da7adb739e81f83e1c07e723e4a789">
compiler/GHC/Tc/Gen/Bind.hs
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<li class="file-stats">
<a href="#902811828741e6bcd64702935bbb54edbbd070ef">
compiler/GHC/Tc/Gen/Expr.hs
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<li class="file-stats">
<a href="#aebe2c3d616f6843166d2657bed048898add6bc9">
compiler/GHC/Tc/Instance/Class.hs
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<li class="file-stats">
<a href="#07389a8f0516c26409d86f6bb651ed00759b5d4c">
compiler/GHC/Tc/Instance/Family.hs
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<li class="file-stats">
<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<a href="#93bba9b9e0195db135fec54160523a427ea042fd">
compiler/GHC/Tc/Types/Origin.hs
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<a href="#6a120b0673f8920127d8fffdaa16f01b90cc92d7">
compiler/GHC/Tc/Utils/Zonk.hs
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<a href="#261c0c5029eb34eb7436b087d77314f377ff8223">
compiler/GHC/Types/Id/Make.hs
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<a href="#a4ff33ccde330caaa403f371defa5ddc5ad10c84">
testsuite/tests/dependent/should_compile/all.T
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<a href="#e408ede0ba572138996183f275e280adf0960a11">
testsuite/tests/indexed-types/should_compile/PushedInAsGivens.stderr
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<a href="#010d502bda3fe496a014b4e03be9bb3b2eff0757">
testsuite/tests/indexed-types/should_fail/ExtraTcsUntch.stderr
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<li class="file-stats">
<a href="#5958b0db89def323ba434ece87b3347b8c9e8d31">
testsuite/tests/indexed-types/should_fail/T13972.hs
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<li class="file-stats">
<a href="#c6778431c5f041d78bbeda6e1c439a191f6b8db2">
testsuite/tests/indexed-types/should_fail/T14230a.stderr
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<li class="file-stats">
<a href="#68e538366fb1e2e205d75a66580af76bc1e59d16">
testsuite/tests/partial-sigs/should_fail/NamedWildcardExplicitForall.stderr
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<a href="#f6f3fe949a2cbc72ebd9c2a22b3067595b1831a9">
testsuite/tests/polykinds/T14172.stderr
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<a href="#4a506e84cf3d19a7008096f597259adc9be12f8d">
testsuite/tests/th/T11452.stderr
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<h4>Changes:</h4>
<li id="e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76"><strong>compiler/GHC/Tc/Errors.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -556,9 +556,15 @@ instance Outputable ErrorItem where</td>
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="haskell"><span class="cd">-- | Makes an error item from a constraint, calculating whether or not</span></span>
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<pre style="margin: 0;"> <span id="LC558" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the item should be suppressed. See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Types.Constraint</span></span>
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<pre style="margin: 0;">-<span id="LC560" class="line" lang="haskell"><span class="n" style="color: #333;">mkErrorItem</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Types.Constraint. Returns Nothing if we should just ignore</span></span>
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a constraint. See Note [Constraints to ignore].</span></span>
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell"><span class="n" style="color: #333;">mkErrorItem</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"><span class="n" style="color: #333;">mkErrorItem</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AssocFamPatOrigin</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctOrigin</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="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;">"Ignoring constraint:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="565" 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="LC565" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Constraints to ignore]</span></span>
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC567" 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="LC568" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLoc</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC569" 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;">ctFlavour</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -569,11 +575,11 @@ mkErrorItem ct</td>
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<pre style="margin: 0;"> <span id="LC575" 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;">supp</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">dest</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC572" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC573" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_evdest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m_evdest</span></span>
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<pre style="margin: 0;">-<span id="LC574" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flav</span></span>
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<pre style="margin: 0;">-<span id="LC575" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;">-<span id="LC576" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">suppress</span> <span class="p">}}</span></span>
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Just</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">ei_evdest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m_evdest</span></span>
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flav</span></span>
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">ei_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">ei_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">suppress</span> <span class="p">}}</span></span>
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- "RAE"</span></span>
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tidyErrorItem :: TidyEnv -> ErrorItem -> ErrorItem</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">@@ -610,7 +616,7 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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<pre style="margin: 0;"> <span id="LC616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , text "tidy_holes =" <+> ppr tidy_holes ])</span></span>
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<pre style="margin: 0;"> <span id="LC617" 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="LC618" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC613" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tidy_items</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">mkErrorItem</span> <span class="n" style="color: #333;">tidy_cts</span></span>
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<pre style="margin: 0;">+<span id="LC619" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tidy_items</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM<span class="idiff left right">aybeM</span></span> <span class="n" style="color: #333;">mkErrorItem</span> <span class="n" style="color: #333;">tidy_cts</span></span>
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614
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620
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"reportWanteds 1"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Simples ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">simples</span></span>
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615
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621
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Suppress ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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616
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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="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tidy_cts ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tidy_cts</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">@@ -837,6 +843,43 @@ We use the `suppress` function within reportWanteds to filter out these two</td>
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cases, then report all other errors. Lastly, we return to these suppressed</span></span>
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838
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ones and report them only if there have been no errors so far.</span></span>
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839
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845
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Constraints to ignore]</span></span>
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847
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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848
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<pre style="margin: 0;">+<span id="LC848" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Some constraints are meant only to aid the solver by unification; a failure</span></span>
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849
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to solve them is not necessarily an error to report to the user. It is critical</span></span>
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that compilation is aborted elsewhere if there are any ignored constraints here;</span></span>
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">they will remain unfilled, and might have been used to rewrite another constraint.</span></span>
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852
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Currently, the constraints to ignore are:</span></span>
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854
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"></span>
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855
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1) Constraints generated in order to unify associated type instance parameters</span></span>
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856
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with class parameters. Here are two illustrative examples:</span></span>
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857
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"></span>
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858
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C (a :: k) where</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F (b :: k)</span></span>
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860
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"></span>
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861
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C True where</span></span>
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862
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F a = Int</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"></span>
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864
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C Left where</span></span>
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865
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<pre style="margin: 0;">+<span id="LC865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F (Left :: a -> Either a b) = Bool</span></span>
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866
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"></span>
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867
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<pre style="margin: 0;">+<span id="LC867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In the first instance, we want to infer that `a` has type Bool. So we emit</span></span>
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868
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<pre style="margin: 0;">+<span id="LC868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a constraint unifying kappa (the guessed type of `a`) with Bool. All is well.</span></span>
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869
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<pre style="margin: 0;">+<span id="LC869" class="line" lang="haskell"></span>
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870
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<pre style="margin: 0;">+<span id="LC870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In the second instance, we process the associated type instance only</span></span>
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871
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<pre style="margin: 0;">+<span id="LC871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> after fixing the quantified type variables of the class instance. We thus</span></span>
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872
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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have skolems a1 and b1 such that the class instance is for (Left :: a1 -> Either a1 b1).</span></span>
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873
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Unifying a1 and b1 with a and b in the type instance will fail, but harmlessly so.</span></span>
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874
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> checkConsistentFamInst checks for this, and will fail if anything has gone</span></span>
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875
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> awry. Really the equality constraints emitted are just meant as an aid, not</span></span>
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876
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a requirement. This is test case T13972.</span></span>
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877
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"></span>
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878
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We detect this case by looking for an origin of AssocFamPatOrigin; constraints</span></span>
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879
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with this origin are dropped entirely during error message reporting.</span></span>
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880
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"></span>
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881
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If there is any trouble, checkValidFamInst bleats, aborting compilation.</span></span>
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882
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"></span>
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840
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883
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<pre style="margin: 0;"> <span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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841
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884
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<pre style="margin: 0;"> <span id="LC884" class="line" lang="haskell"></span>
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842
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885
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<pre style="margin: 0;"> <span id="LC885" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#83f745d921da7adb739e81f83e1c07e723e4a789"><strong>compiler/GHC/Tc/Gen/Bind.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -37,6 +37,8 @@ import GHC.Tc.Utils.Env</td>
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<pre style="margin: 0;"> <span id="LC37" 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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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver</span></span>
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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.Types.Evidence</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Constraint</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.Core.Predicate</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.HsType</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.Pat</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.Utils.TcMType</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">@@ -791,7 +793,7 @@ tcPolyInfer rec_tc prag_fn tc_sig_fn mono bind_list</td>
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791
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell"></span>
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794
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<pre style="margin: 0;"> <span id="LC794" 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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795
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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">exports</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>
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794
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<pre style="margin: 0;">-<span id="LC794" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">mkExport</span> <span class="n" style="color: #333;">prag_fn</span> <span class="n" style="color: #333;">insoluble</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">inferred_theta</span><span class="p">)</span> <span class="n" style="color: #333;">mono_infos</span></span>
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">mkExport</span> <span class="n" style="color: #333;">prag_fn</span> <span class="n" style="color: #333;"><span class="idiff left">residual</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">insoluble</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">inferred_theta</span><span class="p">)</span> <span class="n" style="color: #333;">mono_infos</span></span>
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797
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<pre style="margin: 0;"> <span id="LC797" class="line" lang="haskell"></span>
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798
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<pre style="margin: 0;"> <span id="LC798" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getSrcSpanM</span></span>
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799
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">poly_ids</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">abe_poly</span> <span class="n" style="color: #333;">exports</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">@@ -808,6 +810,7 @@ tcPolyInfer rec_tc prag_fn tc_sig_fn mono bind_list</td>
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808
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810
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"></span>
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809
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811
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<pre style="margin: 0;"> <span id="LC811" 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="LC812" class="line" lang="haskell"><span class="n" style="color: #333;">mkExport</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcPragEnv</span></span>
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<pre style="margin: 0;">+<span id="LC813" 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="c1" style="color: #998; font-style: italic;">-- residual constraints, already emitted (for errors only)</span></span>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <=> there was an insoluble type error</span></span>
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812
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<pre style="margin: 0;"> <span id="LC815" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- when typechecking the bindings</span></span>
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<pre style="margin: 0;"> <span id="LC816" 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;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span> <span class="c1" style="color: #998; font-style: italic;">-- Both already zonked</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">@@ -826,12 +829,12 @@ mkExport :: TcPragEnv</td>
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"></span>
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830
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Pre-condition: the qtvs and theta are already zonked</span></span>
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831
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"></span>
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829
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<pre style="margin: 0;">-<span id="LC829" class="line" lang="haskell"><span class="n" style="color: #333;">mkExport</span> <span class="n" style="color: #333;">prag_fn</span> <span class="n" style="color: #333;">insoluble</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">theta</span></span>
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"><span class="n" style="color: #333;">mkExport</span> <span class="n" style="color: #333;">prag_fn</span> <span class="n" style="color: #333;"><span class="idiff left">residual</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">insoluble</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">theta</span></span>
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830
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833
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"> <span class="n" style="color: #333;">mono_info</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MBI</span> <span class="p">{</span> <span class="n" style="color: #333;">mbi_poly_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">poly_name</span></span>
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831
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834
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mbi_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mb_sig</span></span>
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832
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835
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mbi_mono_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mono_id</span> <span class="p">})</span></span>
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833
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836
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<pre style="margin: 0;"> <span id="LC836" 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;">mono_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">mono_id</span><span class="p">)</span></span>
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834
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<pre style="margin: 0;">-<span id="LC834" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">poly_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkInferredPolyId</span> <span class="n" style="color: #333;">insoluble</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">theta</span> <span class="n" style="color: #333;">poly_name</span> <span class="n" style="color: #333;">mb_sig</span> <span class="n" style="color: #333;">mono_ty</span></span>
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837
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">poly_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkInferredPolyId</span> <span class="n" style="color: #333;"><span class="idiff left">residual</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">insoluble</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">theta</span> <span class="n" style="color: #333;">poly_name</span> <span class="n" style="color: #333;">mb_sig</span> <span class="n" style="color: #333;">mono_ty</span></span>
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835
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838
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"></span>
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836
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839
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: poly_id has a zonked type</span></span>
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837
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840
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">poly_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addInlinePrags</span> <span class="n" style="color: #333;">poly_id</span> <span class="n" style="color: #333;">prag_sigs</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">@@ -867,12 +870,13 @@ mkExport prag_fn insoluble qtvs theta</td>
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867
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"> <span class="n" style="color: #333;">prag_sigs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupPragEnv</span> <span class="n" style="color: #333;">prag_fn</span> <span class="n" style="color: #333;">poly_name</span></span>
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868
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871
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"> <span class="n" style="color: #333;">sig_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">InfSigCtxt</span> <span class="n" style="color: #333;">poly_name</span></span>
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"><span class="n" style="color: #333;">mkInferredPolyId</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <=> there was an insoluble error when</span></span>
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"><span class="n" style="color: #333;">mkInferredPolyId</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="c1" style="color: #998; font-style: italic;">-- the residual constraints, already emitted</span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <=> there was an insoluble error when</span></span>
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- checking the binding group for this Id</span></span>
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<pre style="margin: 0;"> <span id="LC876" 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;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span></span>
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<pre style="margin: 0;"> <span id="LC877" class="line" lang="haskell"> <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;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcIdSigInst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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<pre style="margin: 0;"> <span id="LC878" 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;">TcId</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"><span class="n" style="color: #333;">mkInferredPolyId</span> <span class="n" style="color: #333;">insoluble</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">inferred_theta</span> <span class="n" style="color: #333;">poly_name</span> <span class="n" style="color: #333;">mb_sig_inst</span> <span class="n" style="color: #333;">mono_ty</span></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="n" style="color: #333;">mkInferredPolyId</span> <span class="n" style="color: #333;"><span class="idiff left">residual</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">insoluble</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">inferred_theta</span> <span class="n" style="color: #333;">poly_name</span> <span class="n" style="color: #333;">mb_sig_inst</span> <span class="n" style="color: #333;">mono_ty</span></span>
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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TISI</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_inst_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span> <span class="p">})</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mb_sig_inst</span></span>
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="haskell"> <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="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">poly_id</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">@@ -893,7 +897,7 @@ mkInferredPolyId insoluble qtvs inferred_theta poly_name mb_sig_inst mono_ty</td>
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<pre style="margin: 0;"> <span id="LC897" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We can discard the coercion _co, because we'll reconstruct</span></span>
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<pre style="margin: 0;"> <span id="LC898" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it in the call to tcSubType below</span></span>
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<pre style="margin: 0;"> <span id="LC899" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC896" 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;">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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<pre style="margin: 0;">+<span id="LC900" 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;">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;"><span class="idiff left">residual</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">inferred_theta</span></span>
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<pre style="margin: 0;"> <span id="LC901" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">mono_ty'</span><span class="p">)</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">mb_sig_inst</span></span>
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<pre style="margin: 0;"> <span id="LC902" class="line" lang="haskell"></span>
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903
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<pre style="margin: 0;"> <span id="LC903" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inferred_poly_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkForAllTys</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;">theta'</span> <span class="n" style="color: #333;">mono_ty'</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">@@ -911,12 +915,13 @@ mkInferredPolyId insoluble qtvs inferred_theta poly_name mb_sig_inst mono_ty</td>
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911
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915
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<pre style="margin: 0;"> <span id="LC915" 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;">mkLocalId</span> <span class="n" style="color: #333;">poly_name</span> <span class="n" style="color: #333;">inferred_poly_ty</span><span class="p">)</span> <span class="p">}</span></span>
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912
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916
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="haskell"></span>
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913
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917
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"></span>
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914
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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"><span class="n" style="color: #333;">chooseInferredQuantifiers</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span> <span class="c1" style="color: #998; font-style: italic;">-- inferred</span></span>
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918
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<pre style="margin: 0;">+<span id="LC918" class="line" lang="haskell"><span class="n" style="color: #333;">chooseInferredQuantifiers</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="c1" style="color: #998; font-style: italic;">-- residual constraints</span></span>
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919
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span> <span class="c1" style="color: #998; font-style: italic;">-- inferred</span></span>
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915
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920
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- tvs free in tau type</span></span>
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916
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921
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<pre style="margin: 0;"> <span id="LC921" 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;">TcTyVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- inferred quantified tvs</span></span>
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917
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922
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcIdSigInst</span></span>
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918
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923
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<pre style="margin: 0;"> <span id="LC923" 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;">TyVarBinder</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span><span class="p">)</span></span>
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919
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<pre style="margin: 0;">-<span id="LC919" class="line" lang="haskell"><span class="n" style="color: #333;">chooseInferredQuantifiers</span> <span class="n" style="color: #333;">inferred_theta</span> <span class="n" style="color: #333;">tau_tvs</span> <span class="n" style="color: #333;">qtvs</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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924
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<pre style="margin: 0;">+<span id="LC924" class="line" lang="haskell"><span class="n" style="color: #333;">chooseInferredQuantifiers</span> <span class="n" style="color: #333;"><span class="idiff left">_residual</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">inferred_theta</span> <span class="n" style="color: #333;">tau_tvs</span> <span class="n" style="color: #333;">qtvs</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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920
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925
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<pre style="margin: 0;"> <span id="LC925" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- No type signature (partial or complete) for this binder,</span></span>
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921
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926
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<pre style="margin: 0;"> <span id="LC926" 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;">free_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">closeOverKinds</span> <span class="p">(</span><span class="n" style="color: #333;">growThetaTyVars</span> <span class="n" style="color: #333;">inferred_theta</span> <span class="n" style="color: #333;">tau_tvs</span><span class="p">)</span></span>
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922
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927
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Include kind variables! #7916</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="931" 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">@@ -926,11 +931,11 @@ chooseInferredQuantifiers inferred_theta tau_tvs qtvs Nothing</td>
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926
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931
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<pre style="margin: 0;"> <span id="LC931" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">free_tvs</span> <span class="p">]</span></span>
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927
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932
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<pre style="margin: 0;"> <span id="LC932" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</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="p">}</span></span>
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928
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933
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<pre style="margin: 0;"> <span id="LC933" class="line" lang="haskell"></span>
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929
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<pre style="margin: 0;">-<span id="LC929" class="line" lang="haskell"><span class="n" style="color: #333;">chooseInferredQuantifiers</span> <span class="n" style="color: #333;">inferred_theta</span> <span class="n" style="color: #333;">tau_tvs</span> <span class="n" style="color: #333;">qtvs</span></span>
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<pre style="margin: 0;">-<span id="LC930" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TISI</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sig_inst_sig</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sig</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Always PartialSig</span></span></span>
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<pre style="margin: 0;">-<span id="LC931" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">sig_inst_wcx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wcx</span></span>
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932
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<pre style="margin: 0;">-<span id="LC932" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">sig_inst_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">annotated_theta</span></span>
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933
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<pre style="margin: 0;">-<span id="LC933" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">sig_inst_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">annotated_tvs</span> <span class="p">}))</span></span>
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934
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<pre style="margin: 0;">+<span id="LC934" class="line" lang="haskell"><span class="n" style="color: #333;">chooseInferredQuantifiers</span> <span class="n" style="color: #333;"><span class="idiff left">residual</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">inferred_theta</span> <span class="n" style="color: #333;">tau_tvs</span> <span class="n" style="color: #333;">qtvs</span></span>
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935
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TISI</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sig_inst_sig</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sig</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PartialSig</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">psig_name</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fn_name</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">psig_hs_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_ty</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">})</span></span></span>
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<pre style="margin: 0;">+<span id="LC936" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_wcx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wcx</span></span>
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">annotated_theta</span></span>
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">annotated_tvs</span> <span class="p">}))</span></span>
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<pre style="margin: 0;"> <span id="LC939" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- Choose quantifiers for a partial type signature</span></span>
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940
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<pre style="margin: 0;"> <span id="LC940" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">psig_qtv_prs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTyVarTyVarPairs</span> <span class="n" style="color: #333;">annotated_tvs</span></span>
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941
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<pre style="margin: 0;"> <span id="LC941" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -943,8 +948,8 @@ chooseInferredQuantifiers inferred_theta tau_tvs qtvs</td>
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943
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948
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- signature is not actually quantified. How can that happen?</span></span>
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949
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<pre style="margin: 0;"> <span id="LC949" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Quantification and partial signatures] Wrinkle 4</span></span>
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950
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<pre style="margin: 0;"> <span id="LC950" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Solver</span></span>
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946
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">report_mono_sig_tv_err</span> <span class="p">[</span> <span class="n" style="color: #333;"><span class="idiff left">n</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff right">n</span></span><span class="p">,</span><span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">psig_qtv_prs</span></span>
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elem</span><span class="p">`</span> <span class="n" style="color: #333;">qtvs</span><span class="p">)</span> <span class="p">]</span></span>
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951
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<pre style="margin: 0;">+<span id="LC951" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">report_mono_sig_tv_err</span> <span class="p">[</span> <span class="n" style="color: #333;"><span class="idiff left">pr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pr</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span><span class="p">,</span><span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">psig_qtv_prs</span></span>
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elem</span><span class="p">`</span> <span class="n" style="color: #333;">qtvs</span><span class="p">)</span> <span class="p">]</span></span>
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953
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<pre style="margin: 0;"> <span id="LC953" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC954" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">psig_qtvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">psig_qtv_prs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC955" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -961,22 +966,28 @@ chooseInferredQuantifiers inferred_theta tau_tvs qtvs</td>
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961
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<pre style="margin: 0;"> <span id="LC966" 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;">final_qtvs</span><span class="p">,</span> <span class="n" style="color: #333;">my_theta</span><span class="p">)</span> <span class="p">}</span></span>
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962
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967
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<pre style="margin: 0;"> <span id="LC967" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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963
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968
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<pre style="margin: 0;"> <span id="LC968" class="line" lang="haskell"> <span class="n" style="color: #333;">report_dup_tyvar_tv_err</span> <span class="p">(</span><span class="n" style="color: #333;">n1</span><span class="p">,</span><span class="n" style="color: #333;">n2</span><span class="p">)</span></span>
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964
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<pre style="margin: 0;">-<span id="LC964" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</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;">fn_name</span><span class="p">,</span> <span class="n" style="color: #333;">psig_hs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig</span></span>
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965
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969
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<pre style="margin: 0;"> <span id="LC969" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErrTc</span> <span class="p">(</span><span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Couldn't match"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n1</span><span class="p">)</span></span>
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966
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970
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<pre style="margin: 0;"> <span id="LC970" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"with"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n2</span><span class="p">))</span></span>
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967
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971
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"both bound by the partial type signature:"</span><span class="p">)</span></span>
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968
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972
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<pre style="margin: 0;"> <span id="LC972" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fn_name</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;">hs_ty</span><span class="p">)))</span></span>
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969
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973
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<pre style="margin: 0;"> <span id="LC973" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC970" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Can't happen; by now we know it's a partial sig</span></span>
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971
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<pre style="margin: 0;">-<span id="LC971" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"report_tyvar_tv_err"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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972
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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"></span>
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973
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<pre style="margin: 0;">-<span id="LC973" class="line" lang="haskell"> <span class="n" style="color: #333;">report_mono_sig_tv_err</span> <span class="n" style="color: #333;">n</span></span>
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974
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<pre style="margin: 0;">-<span id="LC974" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="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;">fn_name</span><span class="p">,</span> <span class="n" style="color: #333;">psig_hs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">+<span id="LC974" class="line" lang="haskell"> <span class="n" style="color: #333;">report_mono_sig_tv_err</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="p">,</span><span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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975
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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="n" style="color: #333;">addErrTc</span> <span class="p">(</span><span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Can't quantify over"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC976" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"bound by the partial type signature:"</span><span class="p">)</span></span>
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977
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<pre style="margin: 0;">-<span id="LC977" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fn_name</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;">hs_ty</span><span class="p">)))</span></span>
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978
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<pre style="margin: 0;">-<span id="LC978" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Can't happen; by now we know it's a partial sig</span></span>
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979
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<pre style="margin: 0;">-<span id="LC979" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"report_mono_sig_tv_err"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"bound by the partial type signature:"</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fn_name</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;">hs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">extra</span> <span class="p">]))</span></span>
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"> <span class="n" style="color: #333;">extra</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">rhs_ty</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="p">[</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- recall that residuals are always implications</span></span>
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<pre style="margin: 0;">+<span id="LC982" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">residual_implic</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bagToList</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">wc_impl</span> <span class="n" style="color: #333;">residual</span></span>
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<pre style="margin: 0;">+<span id="LC983" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">residual_ct</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bagToList</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">wc_simple</span> <span class="p">(</span><span class="n" style="color: #333;">ic_wanted</span> <span class="n" style="color: #333;">residual_implic</span><span class="p">)</span></span>
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984
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">residual_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">residual_ct</span></span>
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985
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<pre style="margin: 0;">+<span id="LC985" 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="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">,</span> <span class="n" style="color: #333;">lhs</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">[</span> <span class="n" style="color: #333;">getEqPredTys_maybe</span> <span class="n" style="color: #333;">residual_pred</span> <span class="p">]</span></span>
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986
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<pre style="margin: 0;">+<span id="LC986" 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;">lhs_tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">[</span> <span class="n" style="color: #333;">tcGetTyVar_maybe</span> <span class="n" style="color: #333;">lhs</span> <span class="p">]</span></span>
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987
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<pre style="margin: 0;">+<span id="LC987" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">lhs_tv</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tv</span> <span class="p">]</span></span>
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988
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<pre style="margin: 0;">+<span id="LC988" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">),</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"should really be"</span><span class="p">,</span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC989" 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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990
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<pre style="margin: 0;">+<span id="LC990" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;"> <span id="LC991" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC992" class="line" lang="haskell"> <span class="n" style="color: #333;">choose_psig_context</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</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="LC993" 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;">VarSet</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</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">@@ -1021,6 +1032,8 @@ chooseInferredQuantifiers inferred_theta tau_tvs qtvs</td>
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Hack alert! See GHC.Tc.Gen.HsType:</span></span>
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Extra-constraint holes in partial type signatures]</span></span>
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"><span class="n" style="color: #333;">chooseInferredQuantifiers</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TISI</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_inst_sig</span> <span class="o" style="font-weight: 600;">=</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;">CompleteSig</span> <span class="p">{})</span> <span class="p">}))</span></span>
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<pre style="margin: 0;">+<span id="LC1036" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"chooseInferredQuantifiers"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"><span class="n" style="color: #333;">mk_impedance_match_msg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MonoBindInfo</span></span>
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#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">@@ -1730,7 +1730,7 @@ tcExprSig expr sig@(PartialSig { psig_name = name, sig_loc = loc })</td>
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<pre style="margin: 0;"> <span id="LC1730" 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="LC1731" 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="LC1732" 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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<pre style="margin: 0;">-<span id="LC1733" 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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<pre style="margin: 0;">+<span id="LC1733" 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;"><span class="idiff left">residual</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">inferred_theta</span></span>
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1734
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<pre style="margin: 0;"> <span id="LC1734" 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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<pre style="margin: 0;"> <span id="LC1735" 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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<pre style="margin: 0;"> <span id="LC1736" 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;">mkForAllTys</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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#aebe2c3d616f6843166d2657bed048898add6bc9"><strong>compiler/GHC/Tc/Instance/Class.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">@@ -131,10 +131,8 @@ matchGlobalInst :: DynFlags</td>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Shortcut solving: overlap]</span></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ClsInstResult</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"><span class="n" style="color: #333;">matchGlobalInst</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">short_cut</span> <span class="n" style="color: #333;">clas</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC134" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">cls_name</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">knownNatClassName</span></span>
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<pre style="margin: 0;">-<span id="LC135" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchKnownNat</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">short_cut</span> <span class="n" style="color: #333;">clas</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC136" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">cls_name</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">knownSymbolClassName</span></span>
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<pre style="margin: 0;">-<span id="LC137" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchKnownSymbol</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">short_cut</span> <span class="n" style="color: #333;">clas</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">cls_name</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">knownNatClassName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchKnownNat</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">short_cut</span> <span class="n" style="color: #333;">clas</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">cls_name</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">knownSymbolClassName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchKnownSymbol</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">short_cut</span> <span class="n" style="color: #333;">clas</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isCTupleClass</span> <span class="n" style="color: #333;">clas</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchCTuple</span> <span class="n" style="color: #333;">clas</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">cls_name</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">typeableClassName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchTypeable</span> <span class="n" style="color: #333;">clas</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">clas</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">heqTyConKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchHeteroEquality</span> <span class="n" style="color: #333;">tys</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#07389a8f0516c26409d86f6bb651ed00759b5d4c"><strong>compiler/GHC/Tc/Instance/Family.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">@@ -162,9 +162,7 @@ addressed yet.</td>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"><span class="n" style="color: #333;">newFamInst</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamFlavor</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="kt" style="color: #458; font-weight: 600;">Unbranched</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;">FamInst</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;">-- Freshen the type variables of the FamInst branches</span></span>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"><span class="n" style="color: #333;">newFamInst</span> <span class="n" style="color: #333;">flavor</span> <span class="n" style="color: #333;">axiom</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoAxiom</span> <span class="p">{</span> <span class="n" style="color: #333;">co_ax_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fam_tc</span> <span class="p">})</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="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">lhs</span> <span class="p">`</span><span class="n" style="color: #333;">subVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tcv_set</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"lhs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_ax</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">lhs_kind</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">rhs_kind</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"kind"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_ax</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs_kind</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs_kind</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We used to have an assertion that the tyvars of the RHS were bound</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="c1" style="color: #998; font-style: italic;">-- We used to have an assertion that the tyvars of the RHS were bound</span></span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- by tcv_set, but in error situations like F Int = a that isn't</span></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- true; a later check in checkValidFamInst rejects it</span></span>
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<pre style="margin: 0;"> <span id="LC168" 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;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">tvs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">freshenTyVarBndrs</span> <span class="n" style="color: #333;">tvs</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -199,10 +197,6 @@ newFamInst flavor axiom@(CoAxiom { co_ax_tc = fam_tc })</td>
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199
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fi_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs'</span></span>
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fi_axiom</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">axiom</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">lhs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"> <span class="n" style="color: #333;">tcv_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">cvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_ax</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprCoAxiom</span> <span class="n" style="color: #333;">axiom</span></span>
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="p">{</span> <span class="n" style="color: #333;">cab_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_cvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cvs</span></span>
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#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">@@ -1147,7 +1147,7 @@ decideMonoTyVars infer_mode name_taus psigs candidates</td>
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1147
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1147
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<pre style="margin: 0;"> <span id="LC1147" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we want to find any other variables that are determined by this</span></span>
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1148
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1148
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<pre style="margin: 0;"> <span id="LC1148" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- set, by functional dependencies or equalities. We thus use</span></span>
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1149
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1149
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<pre style="margin: 0;"> <span id="LC1149" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- oclose to find all further variables determined by this root</span></span>
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<pre style="margin: 0;">-<span id="LC1150" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- set.</span></span>
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<pre style="margin: 0;">+<span id="LC1150" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- set.<span class="idiff left right"> "RAE" update comments</span></span></span>
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<pre style="margin: 0;"> <span id="LC1151" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1152" class="line" lang="haskell"> <span class="n" style="color: #333;">mono_tvs2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">oclose</span> <span class="n" style="color: #333;">candidates</span> <span class="n" style="color: #333;">mono_tvs1</span></span>
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<pre style="margin: 0;"> <span id="LC1153" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1382,7 +1382,7 @@ pickQuantifiablePreds qtvs theta</td>
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<pre style="margin: 0;"> <span id="LC1382" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">checkValidClsArgs</span> <span class="n" style="color: #333;">flex_ctxt</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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1383
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<pre style="margin: 0;"> <span id="LC1383" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Only quantify over predicates that checkValidType</span></span>
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<pre style="margin: 0;"> <span id="LC1384" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- will pass! See #10351.</span></span>
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<pre style="margin: 0;">-<span id="LC1385" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">no_fixed_dependencies</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1385" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">no_fixed_dependencies</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- "RAE": comment this line</span></span></span>
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<pre style="margin: 0;"> <span id="LC1386" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1387" class="line" lang="haskell"> <span class="n" style="color: #333;">no_fixed_dependencies</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC1388" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">and</span> <span class="p">[</span> <span class="n" style="color: #333;">qtvs</span> <span class="p">`</span><span class="n" style="color: #333;">intersectsVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">fd_lhs_tys</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">@@ -2585,11 +2585,15 @@ floatConstraints skols given_ids ev_binds_var no_given_eqs</td>
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<pre style="margin: 0;"> <span id="LC2585" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Solver.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC2586" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassPred</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC2587" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isIPClass</span> <span class="n" style="color: #333;">cls</span></span>
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<pre style="margin: 0;">-<span id="LC2588" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">ip_name_strty</span><span class="p">,</span> <span class="n" style="color: #333;">_ty</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC2589" 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;">ip_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isStrLitTy</span> <span class="n" style="color: #333;">ip_name_strty</span></span>
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<pre style="margin: 0;">-<span id="LC2590" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">ip_name</span> <span class="p">`</span><span class="n" style="color: #333;">elementOfUniqSet</span><span class="p">`</span> <span class="n" style="color: #333;">given_ip_names</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2588" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">ip_name_strty</span><span class="p">,</span> <span class="n" style="color: #333;">ip_ty</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC2589" 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;">ip_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isStrLitTy</span> <span class="n" style="color: #333;">ip_name_strty</span> <span class="c1" style="color: #998; font-style: italic;">-- should always succeed</span></span>
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2590
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<pre style="margin: 0;">+<span id="LC2590" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isCallStackTy</span> <span class="n" style="color: #333;">ip_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="c1" style="color: #998; font-style: italic;">-- don't float HasCallStack, as this will always be solved</span></span>
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2591
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<pre style="margin: 0;">+<span id="LC2591" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Overview of implicit CallStacks]</span></span>
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2592
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<pre style="margin: 0;">+<span id="LC2592" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Types.Evidence</span></span>
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2593
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<pre style="margin: 0;">+<span id="LC2593" class="line" lang="haskell"> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">ip_name</span> <span class="p">`</span><span class="n" style="color: #333;">elementOfUniqSet</span><span class="p">`</span> <span class="n" style="color: #333;">given_ip_names</span><span class="p">)</span></span>
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2591
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2594
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<pre style="margin: 0;"> <span id="LC2594" class="line" lang="haskell"></span>
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2592
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2595
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<pre style="margin: 0;"> <span id="LC2595" 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;">classHasFds</span> <span class="n" style="color: #333;">cls</span></span>
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2596
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<pre style="margin: 0;">+<span id="LC2596" class="line" lang="haskell"></span>
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2597
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<pre style="margin: 0;"> <span id="LC2597" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2598
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<pre style="margin: 0;"> <span id="LC2598" class="line" lang="haskell"></span>
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2599
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<pre style="margin: 0;"> <span id="LC2599" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The set of implicit parameters bound in the enclosing implication</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -168,6 +168,7 @@ canClassNC ev cls tys</td>
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168
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168
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We change the origin to IPOccOrigin so</span></span>
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169
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169
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this rule does not fire again.</span></span>
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170
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Overview of implicit CallStacks]</span></span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Types.Evidence</span></span>
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171
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172
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"></span>
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172
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173
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="n" style="color: #333;">new_loc</span> <span class="n" style="color: #333;">rewriters</span> <span class="n" style="color: #333;">pred</span></span>
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173
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174
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1600,7 +1601,25 @@ representational role]. See #10534 and test case</td>
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1600
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1601
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<pre style="margin: 0;"> <span id="LC1601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">typecheck/should_fail/T10534.</span></span>
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1601
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1602
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<pre style="margin: 0;"> <span id="LC1602" class="line" lang="haskell"></span>
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1602
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1603
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<pre style="margin: 0;"> <span id="LC1603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{4}: Because type variables can stand in for newtypes, we conservatively do not</span></span>
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1603
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<pre style="margin: 0;">-<span id="LC1603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">decompose AppTys over representational equality.</span></span>
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1604
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<pre style="margin: 0;">+<span id="LC1604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">decompose AppTys over representational equality. Here are two examples that</span></span>
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1605
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<pre style="margin: 0;">+<span id="LC1605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">demonstrate why we can't:</span></span>
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1606
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<pre style="margin: 0;">+<span id="LC1606" class="line" lang="haskell"></span>
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1607
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<pre style="margin: 0;">+<span id="LC1607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 4a: newtype Phant a = MkPhant Int</span></span>
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1608
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<pre style="margin: 0;">+<span id="LC1608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] alpha Int ~R beta Bool</span></span>
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1609
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<pre style="margin: 0;">+<span id="LC1609" class="line" lang="haskell"></span>
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1610
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<pre style="margin: 0;">+<span id="LC1610" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we eventually solve alpha := Phant and beta := Phant, then we can solve</span></span>
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1611
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<pre style="margin: 0;">+<span id="LC1611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> this equality by unwrapping. But it would have been disastrous to decompose</span></span>
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1612
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<pre style="margin: 0;">+<span id="LC1612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the wanted to produce Int ~ Bool, which is definitely insoluble.</span></span>
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1613
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<pre style="margin: 0;">+<span id="LC1613" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 4b: newtype Age = MkAge Int</span></span>
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1615
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<pre style="margin: 0;">+<span id="LC1615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] alpha Age ~R Maybe Int</span></span>
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1616
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<pre style="margin: 0;">+<span id="LC1616" class="line" lang="haskell"></span>
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1617
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<pre style="margin: 0;">+<span id="LC1617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> First, a question: if we know that ty1 ~R ty2, can we conclude that</span></span>
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1618
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<pre style="margin: 0;">+<span id="LC1618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a ty1 ~R a ty2? Not for all a. This is precisely why we need role annotations</span></span>
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1619
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<pre style="margin: 0;">+<span id="LC1619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> on type constructors. So, if we were to decompose, we would need to</span></span>
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1620
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<pre style="margin: 0;">+<span id="LC1620" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> decompose to [W] alpha ~R Maybe and [W] Age ~ Int. On the other hand, if we</span></span>
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<pre style="margin: 0;">+<span id="LC1621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> later solve alpha := Maybe, then we would decompose to [W] Age ~R Int, and</span></span>
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<pre style="margin: 0;">+<span id="LC1622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that would be soluble.</span></span>
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1604
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1623
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<pre style="margin: 0;"> <span id="LC1623" class="line" lang="haskell"></span>
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1605
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<pre style="margin: 0;"> <span id="LC1624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the implementation of can_eq_nc and friends, we don't directly pattern</span></span>
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1606
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1625
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<pre style="margin: 0;"> <span id="LC1625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match using lines like in the tables above, as those tables don't cover</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">@@ -2970,7 +2970,8 @@ addConsistencyConstraints mb_clsinfo fam_app</td>
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<pre style="margin: 0;"> <span id="LC2970" 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;">cls_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">[</span><span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">inst_env</span> <span class="n" style="color: #333;">fam_tc_tv</span><span class="p">]</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2971" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"addConsistencyConstraints"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eqs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2972" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitDerivedEqs</span> <span class="kt" style="color: #458; font-weight: 600;">AssocFamPatOrigin</span> <span class="n" style="color: #333;">eqs</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2973" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Improve inference</span></span>
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<pre style="margin: 0;">+<span id="LC2973" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Improve inference; these equalities will not produce errors.</span></span>
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<pre style="margin: 0;">+<span id="LC2974" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Constraints to ignore] in GHC.Tc.Errors</span></span>
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<pre style="margin: 0;"> <span id="LC2975" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Any mis-match is reports by checkConsistentFamInst</span></span>
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<pre style="margin: 0;"> <span id="LC2976" 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="LC2977" 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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#93bba9b9e0195db135fec54160523a427ea042fd"><strong>compiler/GHC/Tc/Types/Origin.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -372,6 +372,8 @@ data CtOrigin</td>
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ArithSeqOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ArithSeqInfo</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- [x..], [x..y] etc</span></span>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AssocFamPatOrigin</span> <span class="c1" style="color: #998; font-style: italic;">-- When matching the patterns of an associated</span></span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- family instance with that of its parent class</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- IMPORTANT: These constraints will never cause errors;</span></span>
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Constraints to ignore] in GHC.Tc.Errors</span></span>
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SectionOrigin</span></span>
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TupleOrigin</span> <span class="c1" style="color: #998; font-style: italic;">-- (..,..)</span></span>
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigOrigin</span> <span class="c1" style="color: #998; font-style: italic;">-- e :: ty</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#6a120b0673f8920127d8fffdaa16f01b90cc92d7"><strong>compiler/GHC/Tc/Utils/Zonk.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1833,11 +1833,6 @@ zonkCoHole env hole@(CoercionHole { ch_ref = ref, ch_co_var = cv })</td>
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<pre style="margin: 0;"> <span id="LC1833" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (undeferred) type errors. Originally, I put in a panic</span></span>
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<pre style="margin: 0;"> <span id="LC1834" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here, but that caused too many uses of `failIfErrsM`.</span></span>
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1835
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<pre style="margin: 0;"> <span id="LC1835" 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="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;">"Zonking unfilled coercion hole"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hole</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1836" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">debugIsOn</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1837" class="line" lang="haskell"> <span class="n" style="color: #333;">whenNoErrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1838" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MASSERT2</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC1839" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Type-correct unfilled coercion hole"</span></span>
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<pre style="margin: 0;">-<span id="LC1840" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hole</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1836" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cv'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkCoVar</span> <span class="n" style="color: #333;">cv</span></span>
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<pre style="margin: 0;"> <span id="LC1837" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkCoVarCo</span> <span class="n" style="color: #333;">cv'</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1838" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This will be an out-of-scope variable, but keeping</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#261c0c5029eb34eb7436b087d77314f377ff8223"><strong>compiler/GHC/Types/Id/Make.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">@@ -826,7 +826,6 @@ For further reading, see:</td>
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Bangs on imported data constructors]</span></span>
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<pre style="margin: 0;"> <span id="LC828" 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="LC829" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We pass Maybe [HsImplBang] to mkDataConRep to make use of HsImplBangs</span></span>
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from imported modules.</span></span>
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#a4ff33ccde330caaa403f371defa5ddc5ad10c84"><strong>testsuite/tests/dependent/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -66,3 +66,4 @@ test('T16326_Compile2', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16391a</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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67
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16344b</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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68
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16347</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="LC69" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LopezJuan</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/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#e408ede0ba572138996183f275e280adf0960a11"><strong>testsuite/tests/indexed-types/should_compile/PushedInAsGivens.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">PushedInAsGivens.hs:10:31: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Could not deduce: a<span class="idiff left right">1 ~ a</span></span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> from the context: F Int ~ [a<span class="idiff left right">1</span>]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Could not deduce: a<span class="idiff left right"> ~ a0</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> from the context: F Int ~ [a]</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> bound by the type signature for:</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> foo :: forall a<span class="idiff left right">1. (F Int ~ [a1]) => a1</span> -> Int</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> foo :: forall a<span class="idiff left right">. (F Int ~ [a]) => a</span> -> Int</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> at PushedInAsGivens.hs:9:13-44</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> ‘a<span class="idiff left right">1</span>’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> foo :: forall a<span class="idiff left right">1. (F Int ~ [a1]) => a1</span> -> Int</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> foo :: forall a<span class="idiff left right">. (F Int ~ [a]) => a</span> -> Int</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> at PushedInAsGivens.hs:9:13-44</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> the inferred type of bar :: a -> (a, Int)</span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"> at PushedInAsGivens.hs:(9,1)-(11,20)</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> • In the expression: y</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> In the first argument of ‘length’, namely ‘[x, y]’</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> In the expression: length [x, y]</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"> x :: a<span class="idiff left right">1</span> (bound at PushedInAsGivens.hs:10:17)</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext"> foo :: a<span class="idiff left right">1</span> -> Int (bound at PushedInAsGivens.hs:10:13)</span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext"> y :: a (bound at PushedInAsGivens.hs:9:5)</span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="plaintext"> bar :: a<span class="idiff left right"> -> (a</span>, Int) (bound at PushedInAsGivens.hs:9:1)</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> x :: a (bound at PushedInAsGivens.hs:10:17)</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> foo :: a -> Int (bound at PushedInAsGivens.hs:10:13)</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> y :: a<span class="idiff left right">0</span> (bound at PushedInAsGivens.hs:9:5)</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> bar :: a<span class="idiff left right">0 -> (a0</span>, Int) (bound at PushedInAsGivens.hs:9:1)</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">PushedInAsGivens.hs:11:15: error:</span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext"> • Couldn't match type ‘F Int’ with ‘[a]’</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> • Couldn't match type ‘F Int’ with ‘[a<span class="idiff left right">0</span>]’</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"> arising from a use of ‘foo’</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> The type variable ‘a0’ is ambiguous</span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"> • In the expression: foo y</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"> In the expression: (y, foo y)</span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"> In the expression:</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">@@ -32,5 +30,5 @@ PushedInAsGivens.hs:11:15: error:</td>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext"> foo x = length [...]</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"> in (y, foo y)</span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC35" class="line" lang="plaintext"> y :: a (bound at PushedInAsGivens.hs:9:5)</span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="plaintext"> bar :: a<span class="idiff left right"> -> (a</span>, Int) (bound at PushedInAsGivens.hs:9:1)</span></pre>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"> y :: a<span class="idiff left right">0</span> (bound at PushedInAsGivens.hs:9:5)</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext"> bar :: a<span class="idiff left right">0 -> (a0</span>, Int) (bound at PushedInAsGivens.hs:9:1)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#010d502bda3fe496a014b4e03be9bb3b2eff0757"><strong>testsuite/tests/indexed-types/should_fail/ExtraTcsUntch.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">ExtraTcsUntch.hs:23:18: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match expected type ‘F Int’ with actual type ‘[p]’</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match expected type ‘F Int’ with actual type ‘[p0]’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> The type variable ‘p0’ is ambiguous</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • In the first argument of ‘h’, namely ‘[x]’</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> In the expression: h [x]</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> In an equation for ‘g1’: g1 _ = h [x]</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> x :: p (bound at ExtraTcsUntch.hs:21:3)</span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext"> f :: p -> ((), ((), ())) (bound at ExtraTcsUntch.hs:21:1)</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> x :: p<span class="idiff left right">0</span> (bound at ExtraTcsUntch.hs:21:3)</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> f :: p<span class="idiff left right">0</span> -> ((), ((), ())) (bound at ExtraTcsUntch.hs:21:1)</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext">ExtraTcsUntch.hs:25:38: error:</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> • Couldn't match expected type ‘F Int’ with actual type ‘[[a0]]’</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#5958b0db89def323ba434ece87b3347b8c9e8d31"><strong>testsuite/tests/indexed-types/should_fail/T13972.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -8,7 +8,7 @@ import Data.Kind</td>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</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="LC9" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This used to fail, with a mysterious error messa<span class="idiff left right">t</span>e</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This used to fail, with a mysterious error messa<span class="idiff left right">g</span>e</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Type indexes must match class instance head</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Expected: T (a1 -> Either a1 b1)</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Actual: T (a -> Either a b)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#c6778431c5f041d78bbeda6e1c439a191f6b8db2"><strong>testsuite/tests/indexed-types/should_fail/T14230a.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T14230a.hs:13:14: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Expected kind ‘k -> *’, but ‘a’ has kind ‘*’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> • In the second argument of ‘CD’, namely ‘(a :: k -> *)’</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> In the data instance declaration for ‘CD’</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T14230a.hs:13:3: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Type indexes must match class instance head</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Expected: CD (*) (Maybe a)</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> Actual: CD k a</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the data instance declaration for ‘CD’</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> In the instance declaration for ‘C (Maybe a)’</span></pre>
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<li id="68e538366fb1e2e205d75a66580af76bc1e59d16">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#68e538366fb1e2e205d75a66580af76bc1e59d16"><strong>testsuite/tests/partial-sigs/should_fail/NamedWildcardExplicitForall.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -17,23 +17,11 @@ NamedWildcardExplicitForall.hs:10:8: error:</td>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext"> To use the inferred type, enable PartialTypeSignatures</span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext"> • In the type signature: bar :: _a -> _a</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext">NamedWildcardExplicitForall.hs:13:26: error:</span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext"> • Found type wildcard ‘_b’ standing for ‘Bool’</span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="plaintext"> To use the inferred type, enable PartialTypeSignatures</span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="plaintext"> • In the type signature: baz :: forall _a. _a -> _b -> (_a, _b)</span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext">NamedWildcardExplicitForall.hs:14:16: error:</span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="plaintext"> • Couldn't match expected type ‘Bool’ with actual type ‘_a’</span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="plaintext"> ‘_a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="plaintext"> the inferred type of baz :: _a -> Bool -> (_a, Bool)</span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext"> at NamedWildcardExplicitForall.hs:13:15-16</span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="plaintext"> • In the first argument of ‘not’, namely ‘x’</span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="plaintext"> In the expression: not x</span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="plaintext"> In the expression: (not x, not y)</span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC34" class="line" lang="plaintext"> x :: _a (bound at NamedWildcardExplicitForall.hs:14:5)</span>
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<pre style="margin: 0;">-<span id="LC35" class="line" lang="plaintext"> baz :: _a -> Bool -> (_a, Bool)</span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="plaintext"> (bound at NamedWildcardExplicitForall.hs:14:1)</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext">NamedWildcardExplicitForall.hs:14:1: error:</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> Can't quantify over ‘_a’</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> bound by the partial type signature:</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> baz :: forall _a. _a -> _b -> (_a, _b)</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> ‘_a’ should really be ‘Bool’</span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext">NamedWildcardExplicitForall.hs:16:8: error:</span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"> • Found type wildcard ‘_a’ standing for ‘Bool’</span>
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<li id="f6f3fe949a2cbc72ebd9c2a22b3067595b1831a9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#f6f3fe949a2cbc72ebd9c2a22b3067595b1831a9"><strong>testsuite/tests/polykinds/T14172.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -24,15 +24,3 @@ T14172.hs:7:19: error:</td>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"> traverseCompose :: (a -> f b) -> g a -> f (h a')</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"> (bound at T14172.hs:7:1)</span></pre>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="plaintext">T14172.hs:7:19: error:</span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext"> • Couldn't match type ‘Compose f'0 g'1 a'0 -> f (h a')’</span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="plaintext"> with ‘g a -> f (h a')’</span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="plaintext"> Expected type: (a -> f b) -> g a -> f (h a')</span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="plaintext"> Actual type: (a -> f b) -> Compose f'0 g'1 a'0 -> f (h a')</span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="plaintext"> • In the expression: _Wrapping Compose . traverse</span>
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<pre style="margin: 0;">-<span id="LC34" class="line" lang="plaintext"> In an equation for ‘traverseCompose’:</span>
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<pre style="margin: 0;">-<span id="LC35" class="line" lang="plaintext"> traverseCompose = _Wrapping Compose . traverse</span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="plaintext"> traverseCompose :: (a -> f b) -> g a -> f (h a')</span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="plaintext"> (bound at T14172.hs:7:1)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f550eed809836699a98f67220baaf980bc08dcb9#4a506e84cf3d19a7008096f597259adc9be12f8d"><strong>testsuite/tests/th/T11452.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -9,7 +9,6 @@ T11452.hs:6:12: error:</td>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">T11452.hs:6:14: error:</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘p0’</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> with a type involving polytypes: forall a. a -> a</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> GHC doesn't yet support impredicative polymorphism</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> • In the Template Haskell quotation [|| \ _ -> () ||]</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> In the expression: [|| \ _ -> () ||]</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> In the Template Haskell splice $$([|| \ _ -> () ||])</span></pre>
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