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<h3>
Simon Peyton Jones pushed to branch wip/T16762
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61eaca5f163912249d11796a2ab6d80044ca0b5c">61eaca5f</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-10-27T22:36:11+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">wibbles after RAE review
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<h4>4 changed files:</h4>
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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<a href="#cb4ad425e8ed846dfcc5d3793b08b95f6864e545">
compiler/GHC/Utils/Monad.hs
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<h4>Changes:</h4>
<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61eaca5f163912249d11796a2ab6d80044ca0b5c#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -366,9 +366,9 @@ tcHsSigWcType :: UserTypeCtxt -> LHsSigWcType GhcRn -> TcM Type</td>
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<pre style="margin: 0;"> <span id="LC366" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- already checked this, so we can simply ignore it.</span></span>
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<pre style="margin: 0;"> <span id="LC367" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsSigWcType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcHsSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="n" style="color: #333;">dropWildCards</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC368" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"><span class="n" style="color: #333;">kcClassSigType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">SkolemInfo</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="n" style="color: #333;">kcClassSigType</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is a special form of tcClassSigType that is used during the</span></span>
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- kind-checking phase to infer the kind of class variables. Cf. tc_hs_sig_type.</span></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- kind-checking phase to infer the kind of class variables. Cf. tc_<span class="idiff left right">l</span>hs_sig_type.</span></span>
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Importantly, this does *not* kind-generalize. Consider</span></span>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- class SC f where</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;">-- meth :: forall a (x :: f a). Proxy x -> ()</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">@@ -379,7 +379,7 @@ kcClassSigType :: SkolemInfo -> [Located Name] -> LHsSigType GhcRn -> TcM ()</td>
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- end up promoting kappa to the top level (because kind-generalization is</span></span>
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- normally done right before adding a binding to the context), and then we</span></span>
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- can't set kappa := f a, because a is local.</span></span>
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<pre style="margin: 0;">-<span id="LC382" class="line" lang="haskell"><span class="n" style="color: #333;">kcClassSigType</span> <span class="n" style="color: #333;"><span class="idiff left">_skol_info</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">names</span></span>
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"><span class="n" style="color: #333;">kcClassSigType</span> <span class="n" style="color: #333;">names</span></span>
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"> <span class="n" style="color: #333;">sig_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSig</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_outer_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_body</span> <span class="o" style="font-weight: 600;">=</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="LC384" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addSigCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">funsSigCtxt</span> <span class="n" style="color: #333;">names</span><span class="p">)</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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385
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bindOuterSigTKBndrs_Tv</span> <span class="n" style="color: #333;">hs_outer_bndrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -390,7 +390,7 @@ tcClassSigType :: [Located Name] -> LHsSigType GhcRn -> TcM Type</td>
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390
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<pre style="margin: 0;"> <span id="LC390" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does not do validity checking</span></span>
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391
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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell"><span class="n" style="color: #333;">tcClassSigType</span> <span class="n" style="color: #333;">names</span> <span class="n" style="color: #333;">sig_ty</span></span>
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392
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<pre style="margin: 0;"> <span id="LC392" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addSigCtxt</span> <span class="n" style="color: #333;">sig_ctxt</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">implic</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;">tc_hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">sig_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TheKind</span> <span class="n" style="color: #333;">liftedTypeKind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC393" 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;">implic</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;">tc_<span class="idiff left right">l</span>hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">sig_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TheKind</span> <span class="n" style="color: #333;">liftedTypeKind</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitImplication</span> <span class="n" style="color: #333;">implic</span></span>
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do not zonk-to-Type, nor perform a validity check</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -421,9 +421,9 @@ tcHsSigType ctxt sig_ty</td>
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcHsSigType {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC423" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Generalise here: see Note [Kind generalisation]</span></span>
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<pre style="margin: 0;">-<span id="LC424" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">implic</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;">tc_hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">sig_ty</span> <span class="p">(</span><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC424" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">implic</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;">tc_<span class="idiff left right">l</span>hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">sig_ty</span> <span class="p">(</span><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC425" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC426" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Spit out the implication (and perhaps fail fast)</span></span></span>
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<pre style="margin: 0;">+<span id="LC426" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Float out constraints, failing fast if not possible</span></span></span>
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Failure in local type signatures] in GHC.Tc.Solver</span></span>
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcHsSigType 2"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implic</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">simplifyAndEmitFlatConstraints</span> <span class="p">(</span><span class="n" style="color: #333;">mkImplicWC</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">implic</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">@@ -435,7 +435,7 @@ tcHsSigType ctxt sig_ty</td>
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<pre style="margin: 0;"> <span id="LC435" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC436" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SigTypeSkol</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC438" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">+<span id="LC438" class="line" lang="haskell"><span class="n" style="color: #333;">tc_<span class="idiff left right">l</span>hs_sig_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ContextKind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Implication</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC440" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Kind-checks/desugars an 'LHsSigType',</span></span>
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- solve equalities,</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">@@ -443,11 +443,11 @@ tc_hs_sig_type :: SkolemInfo -> LHsSigType GhcRn</td>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This will never emit constraints, as it uses solveEqualities internally.</span></span>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- No validity checking or zonking</span></span>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns also an implication for the unsolved constraints</span></span>
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<pre style="margin: 0;">-<span id="LC446" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSig</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_outer_bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC446" class="line" lang="haskell"><span class="n" style="color: #333;">tc_<span class="idiff left right">l</span>hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSig</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_outer_bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC447" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}))</span> <span class="n" style="color: #333;">ctxt_kind</span></span>
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<pre style="margin: 0;"> <span id="LC448" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC449" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tc_lvl</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">outer_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC450" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelAndSolveEqualitiesX</span> <span class="s" style="color: #d14;">"tc_hs_sig_type"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC450" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelAndSolveEqualitiesX</span> <span class="s" style="color: #d14;">"tc_<span class="idiff left right">l</span>hs_sig_type"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC451" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Failure in local type signatures]</span></span>
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<pre style="margin: 0;"> <span id="LC452" class="line" lang="haskell"> <span class="n" style="color: #333;">tcOuterTKBndrs</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">hs_outer_bndrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC453" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newExpectedKind</span> <span class="n" style="color: #333;">ctxt_kind</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -455,7 +455,7 @@ tc_hs_sig_type skol_info (L loc (HsSig { sig_bndrs = hs_outer_bndrs</td>
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<pre style="margin: 0;"> <span id="LC455" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Any remaining variables (unsolved in the solveEqualities)</span></span>
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- should be in the global tyvars, and therefore won't be quantified</span></span>
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC458" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tc_hs_sig_type"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_outer_bndrs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">outer_bndrs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC458" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tc_<span class="idiff left right">l</span>hs_sig_type"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_outer_bndrs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">outer_bndrs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC459" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">outer_tv_bndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">InvisTVBinder</span><span class="p">])</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">scopedSortOuter</span> <span class="n" style="color: #333;">outer_bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInvisForAllTys</span> <span class="n" style="color: #333;">outer_tv_bndrs</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -475,7 +475,7 @@ tcHsSigType is tricky. Consider (T11142)</td>
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<pre style="margin: 0;"> <span id="LC475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is ill-kinded becuase of a nested skolem-escape.</span></span>
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<pre style="margin: 0;"> <span id="LC476" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC477" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That will show up as an un-solvable constraint in the implication</span></span>
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<pre style="margin: 0;">-<span id="LC478" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">returned by buildTvImplication in tc_hs_sig_type. See Note [Skolem</span></span>
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<pre style="margin: 0;">+<span id="LC478" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">returned by buildTvImplication in tc_<span class="idiff left right">l</span>hs_sig_type. See Note [Skolem</span></span>
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<pre style="margin: 0;"> <span id="LC479" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">escape prevention] in GHC.Tc.Utils.TcType for why it is unsolvable</span></span>
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<pre style="margin: 0;"> <span id="LC480" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(the unification variable for b's kind is untouchable).</span></span>
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<pre style="margin: 0;"> <span id="LC481" 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">@@ -484,7 +484,7 @@ we'll try to float out the constraint, be unable to do so, and fail.</td>
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<pre style="margin: 0;"> <span id="LC484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See GHC.Tc.Solver Note [Failure in local type signatures] for more</span></span>
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<pre style="margin: 0;"> <span id="LC485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">detail on this.</span></span>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC487" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The separation between tcHsSigType and tc_hs_sig_type is because</span></span>
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<pre style="margin: 0;">+<span id="LC487" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The separation between tcHsSigType and tc_<span class="idiff left right">l</span>hs_sig_type is because</span></span>
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<pre style="margin: 0;"> <span id="LC488" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tcClassSigType wants to use the latter, but *not* fail fast, because</span></span>
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">there are skolems from the class decl which are in scope; but it's fine</span></span>
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not to because tcClassDecl1 has a solveEqualities wrapped around all</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">@@ -503,32 +503,31 @@ top level of a signature.</td>
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="haskell"><span class="n" style="color: #333;">tcStandaloneKindSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LStandaloneKindSig</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC504" class="line" lang="haskell"><span class="n" style="color: #333;">tcStandaloneKindSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="n" style="color: #333;">ksig</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addSigCtxt</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ksig</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="n" style="color: #333;"><span class="idiff left">ksig</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">expectedKindInCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="n" style="color: #333;"><span class="idiff left">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ksig</span></span></span>
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkValidType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSigCtxt</span> <span class="n" style="color: #333;">name</span></span>
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC512" class="line" lang="haskell"><span class="n" style="color: #333;">tcTopLHsType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LHsSigType</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">ContextKind</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">-<span id="LC513" class="line" lang="haskell"><span class="n" style="color: #333;">tcTopLHsType</span> <span class="n" style="color: #333;"><span class="idiff left">lsig_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ctxt_kind</span></span></span>
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<pre style="margin: 0;">-<span id="LC514" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;"><span class="idiff left">lsig_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ctxt_kind</span></span></span>
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="haskell"><span class="n" style="color: #333;">tcTopLHsType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">UserTypeCtxt</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LHsSigType</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">GhcRn</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell"><span class="n" style="color: #333;">tcTopLHsType</span> <span class="n" style="color: #333;"><span class="idiff left">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">lsig_ty</span></span></span>
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<pre style="margin: 0;">+<span id="LC514" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;"><span class="idiff left">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">lsig_ty</span></span></span>
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<pre style="margin: 0;"> <span id="LC515" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC516" class="line" lang="haskell"><span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LHsSigType</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcRn</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">ContextKind</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="haskell"><span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">UserTypeCtxt</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LHsSigType</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">GhcRn</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;"> <span id="LC517" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tc_top_lhs_type is used for kind-checking top-level LHsSigTypes where</span></span>
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we want to fully solve /all/ equalities, and report errors</span></span>
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does zonking, but not validity checking because it's used</span></span>
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for things (like deriving and instances) that aren't</span></span>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ordinary types</span></span>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used for both types and kinds</span></span>
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<pre style="margin: 0;">-<span id="LC523" class="line" lang="haskell"><span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="n" style="color: #333;">tyki</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">sig_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSig</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_outer_bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC524" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sig_body</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">body</span></span><span class="idiff"> </span><span class="p"><span class="idiff">}))</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ctxt_kind</span></span></span>
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell"><span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="n" style="color: #333;">tyki</span> <span class="n" style="color: #333;"><span class="idiff left">ctxt</span></span><span class="idiff right"> </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">sig_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSig</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_outer_bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sig_body</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">body</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="LC525" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tc_top_lhs_type {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC527" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">InstSkol</span> <span class="c1" style="color: #998; font-style: italic;">-- Why?</span></span>
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">outer_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelAndSolveEqualitiesX</span> <span class="s" style="color: #d14;">"tc_top_lhs_type"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="haskell"> <span class="n" style="color: #333;">tcOuterTKBndrs</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">hs_outer_bndrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC531" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newExpectedKind</span> <span class="n" style="color: #333;"><span class="idiff left right">ctxt_kind</span></span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newExpectedKind</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">expectedKindInCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC531" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_lhs_type</span> <span class="p">(</span><span class="n" style="color: #333;">mkMode</span> <span class="n" style="color: #333;">tyki</span><span class="p">)</span> <span class="n" style="color: #333;">body</span> <span class="n" style="color: #333;">kind</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC533" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">outer_tv_bndrs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">scopedSortOuter</span> <span class="n" style="color: #333;">outer_bndrs</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="540" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="539" 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">@@ -540,6 +539,8 @@ tc_top_lhs_type tyki (L loc sig_ty@(HsSig { sig_bndrs = hs_outer_bndrs</td>
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">final_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcTypeToType</span> <span class="p">(</span><span class="n" style="color: #333;">mkInfForAllTys</span> <span class="n" style="color: #333;">kvs</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC540" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tc_top_lhs_type }"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">final_ty</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">final_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SigTypeSkol</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC545" 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="LC546" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsDeriv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Kind</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">@@ -552,7 +553,7 @@ tcHsDeriv :: LHsSigType GhcRn -> TcM ([TyVar], Class, [Type], [Kind])</td>
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<pre style="margin: 0;"> <span id="LC553" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsDeriv</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC554" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkNoErrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Avoid redundant error report</span></span>
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<pre style="margin: 0;"> <span id="LC555" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with "illegal deriving", below</span></span>
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<pre style="margin: 0;">-<span id="LC555" class="line" lang="haskell"> <span class="n" style="color: #333;">tcTopLHsType</span> <span class="n" style="color: #333;"><span class="idiff left">hs_ty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">AnyKind</span></span></span>
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<pre style="margin: 0;">+<span id="LC556" class="line" lang="haskell"> <span class="n" style="color: #333;">tcTopLHsType</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">DerivClauseCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hs_ty</span></span></span>
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557
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitForAllTys</span> <span class="n" style="color: #333;">ty</span></span>
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558
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<pre style="margin: 0;"> <span id="LC558" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">kind_args</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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558
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559
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<pre style="margin: 0;"> <span id="LC559" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">getClassPredTys_maybe</span> <span class="n" style="color: #333;">pred</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -581,7 +582,7 @@ tcDerivStrategy mb_lds</td>
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581
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_deriv_strategy</span> <span class="kt" style="color: #458; font-weight: 600;">AnyclassStrategy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">boring_case</span> <span class="kt" style="color: #458; font-weight: 600;">AnyclassStrategy</span></span>
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583
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_deriv_strategy</span> <span class="kt" style="color: #458; font-weight: 600;">NewtypeStrategy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">boring_case</span> <span class="kt" style="color: #458; font-weight: 600;">NewtypeStrategy</span></span>
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583
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584
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_deriv_strategy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ViaStrategy</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC584" class="line" lang="haskell"> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkNoErrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcTopLHsType</span> <span class="n" style="color: #333;"><span class="idiff left">ty</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">AnyKind</span></span></span>
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkNoErrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcTopLHsType</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">DerivClauseCtxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ty</span></span></span>
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<pre style="margin: 0;"> <span id="LC586" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">via_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">via_pred</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitForAllTys</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;"> <span id="LC587" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ViaStrategy</span> <span class="n" style="color: #333;">via_pred</span><span class="p">,</span> <span class="n" style="color: #333;">via_tvs</span><span class="p">)</span></span>
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588
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<pre style="margin: 0;"> <span id="LC588" 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">@@ -599,7 +600,7 @@ tcHsClsInstType user_ctxt hs_inst_ty</td>
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600
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- eagerly avoids follow-on errors when checkValidInstance</span></span>
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601
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sees an unsolved coercion hole</span></span>
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602
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_ty</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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<pre style="margin: 0;">-<span id="LC602" class="line" lang="haskell"> <span class="n" style="color: #333;">tcTopLHsType</span> <span class="n" style="color: #333;"><span class="idiff left">hs_inst_ty</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">TheKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">constraintKind</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"> <span class="n" style="color: #333;">tcTopLHsType</span> <span class="n" style="color: #333;"><span class="idiff left">user_ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hs_inst_ty</span></span></span>
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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkValidInstance</span> <span class="n" style="color: #333;">user_ctxt</span> <span class="n" style="color: #333;">hs_inst_ty</span> <span class="n" style="color: #333;">inst_ty</span></span>
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604
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605
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<pre style="margin: 0;"> <span id="LC605" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">inst_ty</span> <span class="p">}</span></span>
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606
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<pre style="margin: 0;"> <span id="LC606" 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">@@ -823,6 +824,7 @@ mkMode :: TypeOrKind -> TcTyMode</td>
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823
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824
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<pre style="margin: 0;"> <span id="LC824" class="line" lang="haskell"><span class="n" style="color: #333;">mkMode</span> <span class="n" style="color: #333;">tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyki</span><span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span></span>
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824
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825
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<pre style="margin: 0;"> <span id="LC825" class="line" lang="haskell"></span>
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825
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826
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"><span class="n" style="color: #333;">typeLevelMode</span><span class="p">,</span> <span class="n" style="color: #333;">kindLevelMode</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span></span>
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827
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- These modes expect no wildcards (holes) in the type</span></span>
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826
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828
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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"><span class="n" style="color: #333;">kindLevelMode</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span></span>
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827
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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;">typeLevelMode</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>
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828
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830
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<pre style="margin: 0;"> <span id="LC830" 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">@@ -2904,6 +2906,7 @@ expectedKindInCtxt (GhciCtxt {}) = AnyKind</td>
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2904
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2906
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<pre style="margin: 0;"> <span id="LC2906" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The types in a 'default' decl can have varying kinds</span></span>
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2905
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2907
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<pre style="margin: 0;"> <span id="LC2907" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Extended defaults]" in GHC.Tc.Utils.Env</span></span>
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2906
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<pre style="margin: 0;"> <span id="LC2908" class="line" lang="haskell"><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">DefaultDeclCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AnyKind</span></span>
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<pre style="margin: 0;">+<span id="LC2909" class="line" lang="haskell"><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">DerivClauseCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AnyKind</span></span>
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2907
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2910
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<pre style="margin: 0;"> <span id="LC2910" class="line" lang="haskell"><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeAppCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AnyKind</span></span>
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2908
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2911
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<pre style="margin: 0;"> <span id="LC2911" class="line" lang="haskell"><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForSigCtxt</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TheKind</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
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2909
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2912
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<pre style="margin: 0;"> <span id="LC2912" class="line" lang="haskell"><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstDeclCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TheKind</span> <span class="n" style="color: #333;">constraintKind</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2965" 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">@@ -2962,12 +2965,11 @@ bindOuterTKBndrsX skol_mode outer_bndrs thing_inside</td>
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2962
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2965
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<pre style="margin: 0;"> <span id="LC2965" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="p">}</span></span>
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2963
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2966
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<pre style="margin: 0;"> <span id="LC2966" class="line" lang="haskell"></span>
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2964
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2967
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<pre style="margin: 0;"> <span id="LC2967" class="line" lang="haskell"><span class="n" style="color: #333;">getOuterTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsOuterTyVarBndrs</span> <span class="n" style="color: #333;">flag</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC2968" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The returned [TcTyVar] is not necessarily in dependency order</span></span>
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<pre style="margin: 0;">+<span id="LC2969" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- at least for the HsOuterImplicit case</span></span>
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<pre style="margin: 0;"> <span id="LC2970" class="line" lang="haskell"><span class="n" style="color: #333;">getOuterTyVars</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsOuterImplicit</span> <span class="p">{</span> <span class="n" style="color: #333;">hso_ximplicit</span> <span class="o" style="font-weight: 600;">=</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;">tvs</span></span>
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<pre style="margin: 0;"> <span id="LC2971" class="line" lang="haskell"><span class="n" style="color: #333;">getOuterTyVars</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsOuterExplicit</span> <span class="p">{</span> <span class="n" style="color: #333;">hso_xexplicit</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvbs</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">tvbs</span></span>
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<pre style="margin: 0;"> <span id="LC2972" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2968" class="line" lang="haskell"><span class="n" style="color: #333;">applyToFstM</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2969" class="line" lang="haskell"><span class="n" style="color: #333;">applyToFstM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2970" class="line" lang="haskell"></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;">---------------</span></span>
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<pre style="margin: 0;"> <span id="LC2974" class="line" lang="haskell"><span class="n" style="color: #333;">scopedSortOuter</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsOuterTyVarBndrs</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">InvisTVBinder</span><span class="p">]</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;">-- Sort any /implicit/ binders into dependency order</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3085" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3087" 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">@@ -3085,6 +3087,7 @@ bindExplicitTKBndrs_Skol, bindExplicitTKBndrs_Tv</td>
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<pre style="margin: 0;"> <span id="LC3087" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3088" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Skol</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">smVanilla</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_clone</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC3089" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">smVanilla</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_clone</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">sm_tvtv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC3090" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sm_clone: see Note [Cloning for type variable binders]</span></span>
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<pre style="margin: 0;"> <span id="LC3091" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3092" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Q_Skol</span><span class="p">,</span> <span class="n" style="color: #333;">bindExplicitTKBndrs_Q_Tv</span></span>
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<pre style="margin: 0;"> <span id="LC3093" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ContextKind</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3100" 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">@@ -3097,6 +3100,7 @@ bindExplicitTKBndrs_Q_Skol ctxt_kind hs_bndrs thing_inside</td>
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<pre style="margin: 0;"> <span id="LC3100" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">smVanilla</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_clone</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">sm_parent</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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3098
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3101
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<pre style="margin: 0;"> <span id="LC3101" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt_kind</span> <span class="p">})</span></span>
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3099
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3102
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<pre style="margin: 0;"> <span id="LC3102" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_bndrs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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3103
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<pre style="margin: 0;">+<span id="LC3103" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sm_clone=False: see Note [Cloning for type variable binders]</span></span>
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3100
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3104
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<pre style="margin: 0;"> <span id="LC3104" class="line" lang="haskell"></span>
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3101
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3105
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<pre style="margin: 0;"> <span id="LC3105" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Q_Tv</span> <span class="n" style="color: #333;">ctxt_kind</span> <span class="n" style="color: #333;">hs_bndrs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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3102
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3106
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<pre style="margin: 0;"> <span id="LC3106" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">applyToFstM</span> <span class="n" style="color: #333;">binderVars</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3207" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3211" 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">@@ -3207,8 +3211,7 @@ bindImplicitTKBndrsX</td>
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3207
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3211
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<pre style="margin: 0;"> <span id="LC3211" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span></span>
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3208
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3212
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<pre style="margin: 0;"> <span id="LC3212" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">],</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Returned [TcTyVar] are in 1-1 correspondence</span></span>
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3209
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3213
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<pre style="margin: 0;"> <span id="LC3213" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with the passed in [Name]</span></span>
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3210
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<pre style="margin: 0;">-<span id="LC3210" class="line" lang="haskell"><span class="n" style="color: #333;">bindImplicitTKBndrsX</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SM</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_parent</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">check_parent</span><span class="p">,</span> <span class="n" style="color: #333;">sm_clone</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">clone</span></span>
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3211
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<pre style="margin: 0;">-<span id="LC3211" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_tvtv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvtv</span><span class="p">,</span> <span class="n" style="color: #333;">sm_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt_kind</span> <span class="p">})</span></span>
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3214
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<pre style="margin: 0;">+<span id="LC3214" class="line" lang="haskell"><span class="n" style="color: #333;">bindImplicitTKBndrsX</span> <span class="n" style="color: #333;">skol_mode</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SM</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_parent</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">check_parent</span><span class="p">,</span> <span class="n" style="color: #333;">sm_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt_kind</span> <span class="p">})</span></span>
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3212
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3215
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<pre style="margin: 0;"> <span id="LC3215" class="line" lang="haskell"> <span class="n" style="color: #333;">tv_names</span> <span class="n" style="color: #333;">thing_inside</span></span>
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3213
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3216
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<pre style="margin: 0;"> <span id="LC3216" 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;">lcl_env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLclTypeEnv</span></span>
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3214
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3217
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<pre style="margin: 0;"> <span id="LC3217" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tkvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">new_tv</span> <span class="n" style="color: #333;">lcl_env</span><span class="p">)</span> <span class="n" style="color: #333;">tv_names</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3222" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3225" 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">@@ -3222,39 +3225,36 @@ bindImplicitTKBndrsX (SM { sm_parent = check_parent, sm_clone = clone</td>
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3222
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3225
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<pre style="margin: 0;"> <span id="LC3225" 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;">ATyVar</span> <span class="kr" style="font-weight: 600;">_</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;">lookupNameEnv</span> <span class="n" style="color: #333;">lcl_env</span> <span class="n" style="color: #333;">name</span></span>
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3223
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3226
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<pre style="margin: 0;"> <span id="LC3226" 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;">tv</span></span>
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3224
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<td class="diff-line-num new_line" data-linenumber="3227" 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">
3227
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<pre style="margin: 0;"> <span id="LC3227" 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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3225
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<pre style="margin: 0;">-<span id="LC3225" 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;">name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">clone</span> <span class="kr" style="font-weight: 600;">of</span></span>
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3226
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<pre style="margin: 0;">-<span id="LC3226" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</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;">uniq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newUnique</span></span>
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3227
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<pre style="margin: 0;">-<span id="LC3227" 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;">setNameUnique</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">uniq</span><span class="p">)</span> <span class="p">}</span></span>
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3228
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<pre style="margin: 0;">-<span id="LC3228" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">name</span></span>
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3229
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<pre style="margin: 0;">-<span id="LC3229" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newExpectedKind</span> <span class="n" style="color: #333;">ctxt_kind</span></span>
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3230
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<pre style="margin: 0;">-<span id="LC3230" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tvtv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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3231
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<pre style="margin: 0;">-<span id="LC3231" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">newMetaDetails</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarTv</span></span>
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3232
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<pre style="margin: 0;">-<span id="LC3232" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</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;">lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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3233
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<pre style="margin: 0;">-<span id="LC3233" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="n" style="color: #333;">lvl</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="p">}</span></span>
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3234
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<pre style="margin: 0;">-<span id="LC3234" 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;">mkTcTyVar</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">details</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC3228" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newExpectedKind</span> <span class="n" style="color: #333;">ctxt_kind</span></span>
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<pre style="margin: 0;">+<span id="LC3229" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">newTyVarBndr</span> <span class="n" style="color: #333;">skol_mode</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">kind</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC3230" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3231" 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="LC3232" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- SkolemMode</span></span>
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<pre style="margin: 0;"> <span id="LC3233" 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="LC3234" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [SkolemMode]</span></span>
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3241
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<pre style="margin: 0;">-<span id="LC3241" 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="LC3242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">SkolemMode decribes how to typecheck an explict (HsTyVarBndr) or</span></span>
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3243
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<pre style="margin: 0;">-<span id="LC3243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">implicit (Name) binder in a type. It is just a record of flags</span></span>
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3244
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<pre style="margin: 0;">-<span id="LC3244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that describe what sort of TcTyVar to create.</span></span>
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<pre style="margin: 0;">-<span id="LC3245" 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="LC3246" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3235" class="line" lang="haskell"><span class="cd">-- | 'SkolemMode' decribes how to typecheck an explict ('HsTyVarBndr') or</span></span>
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<pre style="margin: 0;">+<span id="LC3236" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- implicit ('Name') binder in a type. It is just a record of flags</span></span>
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<pre style="margin: 0;">+<span id="LC3237" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that describe what sort of 'TcTyVar' to create.</span></span>
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<pre style="margin: 0;"> <span id="LC3238" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemMode</span></span>
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<pre style="margin: 0;"> <span id="LC3239" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SM</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_parent</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 <=> check the in-scope parent type variable</span></span>
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<pre style="margin: 0;">+<span id="LC3240" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Used only for asssociated types</span></span>
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<pre style="margin: 0;">+<span id="LC3241" class="line" lang="haskell"></span>
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3249
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<pre style="margin: 0;"> <span id="LC3242" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_clone</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 <=> fresh unique</span></span>
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<pre style="margin: 0;">+<span id="LC3243" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Cloning for type variable binders]</span></span>
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<pre style="margin: 0;">+<span id="LC3244" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3245" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_tvtv</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 <=> use a TyVarTv, rather than SkolemTv</span></span>
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<pre style="margin: 0;">+<span id="LC3246" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Why? See Note [Inferring kinds for type declarations]</span></span>
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<pre style="margin: 0;">+<span id="LC3247" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.TyCl, and (in this module)</span></span>
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<pre style="margin: 0;">+<span id="LC3248" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Checking partial type signatures]</span></span>
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3249
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<pre style="margin: 0;">+<span id="LC3249" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3250" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_kind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ContextKind</span> <span class="c1" style="color: #998; font-style: italic;">-- Use this for the kind of any new binders</span></span>
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<pre style="margin: 0;">+<span id="LC3251" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3252" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_holes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HoleInfo</span> <span class="c1" style="color: #998; font-style: italic;">-- What to do for wildcards in the kind</span></span>
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<pre style="margin: 0;"> <span id="LC3253" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC3254" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3255" class="line" lang="haskell"><span class="n" style="color: #333;">smVanilla</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemMode</span></span>
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3256
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<pre style="margin: 0;">-<span id="LC3256" class="line" lang="haskell"><span class="n" style="color: #333;">smVanilla</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SM</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_<span class="idiff left">parent</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">False</span></span></span>
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3257
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<pre style="margin: 0;">-<span id="LC3257" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_<span class="idiff left">clone</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Tru</span>e</span></span>
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3256
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<pre style="margin: 0;">+<span id="LC3256" class="line" lang="haskell"><span class="n" style="color: #333;">smVanilla</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SM</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_<span class="idiff left">clone</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">panic</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"sm_clone"</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- We always override this</span></span></span>
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3257
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<pre style="margin: 0;">+<span id="LC3257" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_<span class="idiff left">parent</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Fals</span>e</span></span>
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3258
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3258
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<pre style="margin: 0;"> <span id="LC3258" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_tvtv</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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3259
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3259
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<pre style="margin: 0;"> <span id="LC3259" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AnyKind</span></span>
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3260
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3260
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<pre style="margin: 0;"> <span id="LC3260" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3263" 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">@@ -3263,7 +3263,10 @@ smVanilla = SM { sm_parent = False</td>
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3263
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3263
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<pre style="margin: 0;"> <span id="LC3263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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3264
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3264
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<pre style="margin: 0;"> <span id="LC3264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Sometimes we must clone the Name of a type variable binder (written in</span></span>
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3265
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3265
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<pre style="margin: 0;"> <span id="LC3265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the source program); and sometimes we must not. This is controlled by</span></span>
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3266
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<pre style="margin: 0;">-<span id="LC3266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the sm_clone field of SkolemMode</span></span>
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3266
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<pre style="margin: 0;">+<span id="LC3266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the sm_clone field of SkolemMode.</span></span>
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3267
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<pre style="margin: 0;">+<span id="LC3267" class="line" lang="haskell"></span>
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3268
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<pre style="margin: 0;">+<span id="LC3268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In some cases it doesn't matter whether or not we clone. Perhaps</span></span>
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3269
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<pre style="margin: 0;">+<span id="LC3269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it'd be better to use MustClone/MayClone/MustNotClone.</span></span>
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3267
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3270
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<pre style="margin: 0;"> <span id="LC3270" class="line" lang="haskell"></span>
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3268
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3271
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<pre style="margin: 0;"> <span id="LC3271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we /must not/ clone</span></span>
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3269
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3272
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<pre style="margin: 0;"> <span id="LC3272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* In the binders of a type signature (tcOuterTKBndrs)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3291" 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">@@ -3288,9 +3291,8 @@ When we /must not/ clone</td>
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3288
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3291
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<pre style="margin: 0;"> <span id="LC3291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* bindExplictTKBndrs_Q_Skol, bindExplictTKBndrs_Skol, do not clone.</span></span>
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3289
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3292
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<pre style="margin: 0;"> <span id="LC3292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> There is no need, I think.</span></span>
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3290
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3293
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<pre style="margin: 0;"> <span id="LC3293" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The payoff here is that avoidng gratuitious cloning means that we can</span></span>
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<pre style="margin: 0;">-<span id="LC3292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> lmost always take the fast path in swizzleTcTyConBndrs. "Almost</span></span>
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<pre style="margin: 0;">-<span id="LC3293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> always" means not the case of mutual recursion with polymorphic kinds.</span></span>
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<pre style="margin: 0;">+<span id="LC3294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The payoff here is that avoiding gratuitious cloning means that we can</span></span>
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<pre style="margin: 0;">+<span id="LC3295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> almost always take the fast path in swizzleTcTyConBndrs.</span></span>
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3296
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<pre style="margin: 0;"> <span id="LC3296" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we /must/ clone.</span></span>
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3298
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<pre style="margin: 0;"> <span id="LC3298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* bindOuterSigTKBndrs_Tv, bindExplicitTKBndrs_Tv do cloning</span></span>
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<li id="54436e21ea530a66a8a71bcc01c836f4740b8f02">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61eaca5f163912249d11796a2ab6d80044ca0b5c#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">@@ -238,6 +238,7 @@ floatKindEqualities :: WantedConstraints -> Maybe (Bag Ct, Bag Hole)</td>
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<pre style="margin: 0;"> <span id="LC238" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- more floatable.</span></span>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition 2: the 'wanteds' are zonked, since floatKindEqualities</span></span>
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is not monadic</span></span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [floatKindEqualities vs approximateWC]</span></span>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="haskell"><span class="n" style="color: #333;">floatKindEqualities</span> <span class="n" style="color: #333;">wc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">float_wc</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">wc</span></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="haskell"> <span class="n" style="color: #333;">float_wc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyCoVarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</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">@@ -374,6 +375,16 @@ All this is done:</td>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> reporting errors, we avoid that happening.</span></span>
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also #18062, #11506</span></span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [floatKindEqualities vs approximateWC]</span></span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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381
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">floatKindEqualities and approximateWC are strikingly similar to each</span></span>
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382
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">other, but</span></span>
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383
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"></span>
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384
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* floatKindEqualites tries to float /all/ equalities, and fails if</span></span>
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385
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> it can't, or if any implication is insoluble.</span></span>
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386
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* approximateWC just floats out any constraints</span></span>
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387
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (not just equalities) that can float; it never fails.</span></span>
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377
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388
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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378
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389
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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"></span>
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379
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390
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<pre style="margin: 0;"> <span id="LC390" 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">@@ -2248,6 +2259,7 @@ defaultTyVarTcS the_tv</td>
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2248
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2259
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<pre style="margin: 0;"> <span id="LC2259" class="line" lang="haskell"><span class="n" style="color: #333;">approximateWC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span></span>
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2249
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2260
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<pre style="margin: 0;"> <span id="LC2260" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Postcondition: Wanted or Derived Cts</span></span>
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2250
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2261
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<pre style="margin: 0;"> <span id="LC2261" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [ApproximateWC]</span></span>
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2262
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<pre style="margin: 0;">+<span id="LC2262" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [floatKindEqualities vs approximateWC]</span></span>
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2251
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2263
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<pre style="margin: 0;"> <span id="LC2263" class="line" lang="haskell"><span class="n" style="color: #333;">approximateWC</span> <span class="n" style="color: #333;">float_past_equalities</span> <span class="n" style="color: #333;">wc</span></span>
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2252
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2264
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<pre style="margin: 0;"> <span id="LC2264" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">float_wc</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">wc</span></span>
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2253
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2265
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<pre style="margin: 0;"> <span id="LC2265" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61eaca5f163912249d11796a2ab6d80044ca0b5c#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca"><strong>compiler/GHC/Tc/TyCl.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -746,7 +746,9 @@ swizzleTcTyConBndrs :: [(TcTyCon, ScopedPairs, TcKind)]</td>
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746
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746
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="haskell"><span class="n" style="color: #333;">swizzleTcTyConBndrs</span> <span class="n" style="color: #333;">tc_infos</span></span>
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747
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747
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<pre style="margin: 0;"> <span id="LC747" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">no_swizzle</span> <span class="n" style="color: #333;">swizzle_prs</span></span>
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748
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748
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<pre style="margin: 0;"> <span id="LC748" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This fast path happens almost all the time</span></span>
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749
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<pre style="margin: 0;">-<span id="LC749" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Non-cloning for tyvar binders] in GHC.Tc.Gen.HsType</span></span>
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749
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<pre style="margin: 0;">+<span id="LC749" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Cloning for type variable binders] in GHC.Tc.Gen.HsType</span></span>
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<pre style="margin: 0;">+<span id="LC750" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- "Almost all the time" means not the case of mutual recursion with</span></span>
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<pre style="margin: 0;">+<span id="LC751" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- polymorphic kinds.</span></span>
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<pre style="margin: 0;"> <span id="LC752" 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;">"Skipping swizzleTcTyConBndrs for"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fstOf3</span> <span class="n" style="color: #333;">tc_infos</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC753" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">tc_infos</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC754" 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">@@ -1551,11 +1553,9 @@ kcTyClDecl (ClassDecl { tcdLName = L _ name</td>
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<pre style="margin: 0;"> <span id="LC1553" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;"> <span id="LC1554" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">wrapLocM_</span> <span class="n" style="color: #333;">kc_sig</span><span class="p">)</span> <span class="n" style="color: #333;">sigs</span> <span class="p">}</span></span>
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1555
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<pre style="margin: 0;"> <span id="LC1555" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1554" class="line" lang="haskell"> <span class="n" style="color: #333;">kc_sig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClassOpSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">nms</span> <span class="n" style="color: #333;">op_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">kcClassSigType</span> <span class="n" style="color: #333;"><span class="idiff left">skol_info</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">nms</span> <span class="n" style="color: #333;">op_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1556" class="line" lang="haskell"> <span class="n" style="color: #333;">kc_sig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClassOpSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">nms</span> <span class="n" style="color: #333;">op_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">kcClassSigType</span> <span class="n" style="color: #333;">nms</span> <span class="n" style="color: #333;">op_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1557" class="line" lang="haskell"> <span class="n" style="color: #333;">kc_sig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1558
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<pre style="margin: 0;"> <span id="LC1558" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1557" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyConSkol</span> <span class="kt" style="color: #458; font-weight: 600;">ClassFlavour</span> <span class="n" style="color: #333;">name</span></span>
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<pre style="margin: 0;">-<span id="LC1558" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1559" class="line" lang="haskell"><span class="n" style="color: #333;">kcTyClDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamDecl</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamilyDecl</span> <span class="p">{</span> <span class="n" style="color: #333;">fdInfo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fd_info</span> <span class="p">}))</span> <span class="n" style="color: #333;">fam_tc</span></span>
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1560
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<pre style="margin: 0;"> <span id="LC1560" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- closed type families look at their equations, but other families don't</span></span>
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<pre style="margin: 0;"> <span id="LC1561" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- do anything here</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">@@ -3306,6 +3306,7 @@ tcConDecl rep_tycon tag_map tmpl_bndrs _res_kind res_tmpl new_or_data</td>
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3306
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<pre style="margin: 0;"> <span id="LC3306" class="line" lang="haskell"> <span class="n" style="color: #333;">mkPhiTy</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">$</span></span>
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3307
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<pre style="margin: 0;"> <span id="LC3307" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">$</span></span>
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3308
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<pre style="margin: 0;"> <span id="LC3308" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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3309
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<pre style="margin: 0;">+<span id="LC3309" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcConDecl:GADT"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">names</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tkvs</span><span class="p">)</span></span>
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3309
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3310
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<pre style="margin: 0;"> <span id="LC3310" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">reportUnsolvedEqualities</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">tkvs</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">wanted</span></span>
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3311
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<pre style="margin: 0;"> <span id="LC3311" class="line" lang="haskell"></span>
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3311
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3312
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<pre style="margin: 0;"> <span id="LC3312" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tvbndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarBinders</span> <span class="kt" style="color: #458; font-weight: 600;">InferredSpec</span> <span class="n" style="color: #333;">tkvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">outer_tv_bndrs</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/61eaca5f163912249d11796a2ab6d80044ca0b5c#cb4ad425e8ed846dfcc5d3793b08b95f6864e545"><strong>compiler/GHC/Utils/Monad.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">@@ -11,6 +11,7 @@ module GHC.Utils.Monad</td>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zipWith3M</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zipWith3M_</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zipWith4M</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zipWithAndUnzipM</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAndUnzipM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAndUnzip3M</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAndUnzip4M</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAndUnzip5M</span></span>
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13
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAccumLM</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">applyToFstM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">applyToSndM</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapSndM</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">concatMapM</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapMaybeM</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">@@ -164,6 +165,12 @@ mapSndM f xs = go xs</td>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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166
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">((</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">b</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">b</span><span class="p">;</span> <span class="n" style="color: #333;">rs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">xs</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">((</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">c</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">rs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"><span class="n" style="color: #333;">applyToFstM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"><span class="n" style="color: #333;">applyToFstM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;">applyToSndM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"><span class="n" style="color: #333;">applyToSndM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span><span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"><span class="cd">-- | Monadic version of concatMap</span></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"><span class="n" style="color: #333;">concatMapM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">[</span><span class="n" style="color: #333;">b</span><span class="p">])</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">[</span><span class="n" style="color: #333;">b</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">concatMapM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">liftM</span> <span class="n" style="color: #333;">concat</span> <span class="p">(</span><span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span></span>
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