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<h3>
 Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7802fa17a9a1a0f02fbf95170c13d7a9711a681e">7802fa17</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-08T16:43:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle promoted data constructors in typeToLHsType correctly

Instead of using `nlHsTyVar`, which hardcodes `NotPromoted`, have
`typeToLHsType` pick between `Promoted` and `NotPromoted` by checking
if a type constructor is promoted using `isPromotedDataCon`.

Fixes #18020.
</pre>
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<h4>4 changed files:</h4>
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<a href="#7a1af22e4c32b9aa6ec708d9d3788e1c4db5da9a">
compiler/GHC/Hs/Utils.hs
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<a href="#d67e8c37b660b851784cafe36eb0327428012ff0">
testsuite/tests/deriving/should_compile/T14578.stderr
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<a href="#1ba015f3ba3d29833c39cd76809b7794c6f137db">
testsuite/tests/deriving/should_compile/T14579.stderr
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<a href="#9e5a5679ace50208fd0fe812a9501a789cea6a71">
testsuite/tests/deriving/should_fail/T15073.stderr
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<h4>Changes:</h4>
<li id="7a1af22e4c32b9aa6ec708d9d3788e1c4db5da9a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7802fa17a9a1a0f02fbf95170c13d7a9711a681e#7a1af22e4c32b9aa6ec708d9d3788e1c4db5da9a"><strong>compiler/GHC/Hs/Utils.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">@@ -113,6 +113,7 @@ import GHC.Tc.Types.Evidence</td>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Reader</span></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">appTyArgFlags</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitAppTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyConArgFlags</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyConAppNeedsKindSig</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TysWiredIn</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">unitTy</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="687" 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">@@ -686,7 +687,11 @@ typeToLHsType ty</td>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell">       <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell">        <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;">-<span id="LC689" 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;">go_app</span> <span class="p">(</span><span class="n" style="color: #333;">nlHsTyVar</span> <span class="p">(</span><span class="n" style="color: #333;">getRdrName</span> <span class="n" style="color: #333;">tc</span><span class="p">))</span> <span class="n" style="color: #333;">args</span> <span class="p">(</span><span class="n" style="color: #333;">tyConArgFlags</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC690" 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;">go_app</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsTyVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">prom</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">getRdrName</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell">                     <span class="n" style="color: #333;">args</span> <span class="p">(</span><span class="n" style="color: #333;">tyConArgFlags</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"></span>
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693
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell">        <span class="n" style="color: #333;">prom</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PromotionFlag</span></span>
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell">        <span class="n" style="color: #333;">prom</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isPromotedDataCon</span> <span class="n" style="color: #333;">tc</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">IsPromoted</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">NotPromoted</span></span>
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690
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695
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<pre style="margin: 0;"> <span id="LC695" class="line" lang="haskell">    <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="p">{})</span>        <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_app</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">head</span><span class="p">)</span> <span class="n" style="color: #333;">args</span> <span class="p">(</span><span class="n" style="color: #333;">appTyArgFlags</span> <span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC696" class="line" lang="haskell">      <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="haskell">        <span class="n" style="color: #333;">head</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<br>
</li>
<li id="d67e8c37b660b851784cafe36eb0327428012ff0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7802fa17a9a1a0f02fbf95170c13d7a9711a681e#d67e8c37b660b851784cafe36eb0327428012ff0"><strong>testsuite/tests/deriving/should_compile/T14578.stderr</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="9" 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">@@ -9,7 +9,7 @@ Derived class instances:</td>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">    GHC.Base.sconcat ::</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">      GHC.Base.NonEmpty (T14578.Wat f g a) -> T14578.Wat f g a</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext">    GHC.Base.stimes ::</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext">      forall (b :: TYPE GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">      forall (b :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext">      GHC.Real.Integral b => b -> T14578.Wat f g a -> T14578.Wat f g a</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">    (GHC.Base.<>)</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext">      = GHC.Prim.coerce</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="37" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -37,12 +37,12 @@ Derived class instances:</td>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext">  instance GHC.Base.Functor f =></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext">           GHC.Base.Functor (T14578.App f) where</span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext">    GHC.Base.fmap ::</span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="plaintext">      forall (a :: TYPE GHC.Types.LiftedRep)</span>
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<pre style="margin: 0;">-<span id="LC41" class="line" lang="plaintext">             (b :: TYPE GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext">      forall (a :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep)</span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext">             (b :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext">      (a -> b) -> T14578.App f a -> T14578.App f b</span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext">    (GHC.Base.<$) ::</span>
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<pre style="margin: 0;">-<span id="LC44" class="line" lang="plaintext">      forall (a :: TYPE GHC.Types.LiftedRep)</span>
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<pre style="margin: 0;">-<span id="LC45" class="line" lang="plaintext">             (b :: TYPE GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="plaintext">      forall (a :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep)</span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="plaintext">             (b :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext">      a -> T14578.App f b -> T14578.App f a</span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext">    GHC.Base.fmap</span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="plaintext">      = GHC.Prim.coerce</span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="plaintext">  instance GHC.Base.Applicative f =></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext">           GHC.Base.Applicative (T14578.App f) where</span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext">    GHC.Base.pure ::</span>
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="plaintext">      forall (a :: TYPE GHC.Types.LiftedRep). a -> T14578.App f a</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext">      forall (a :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep). a -> T14578.App f a</span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext">    (GHC.Base.<*>) ::</span>
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<pre style="margin: 0;">-<span id="LC61" class="line" lang="plaintext">      forall (a :: TYPE GHC.Types.LiftedRep)</span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="plaintext">             (b :: TYPE GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext">      forall (a :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep)</span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="plaintext">             (b :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="plaintext">      T14578.App f (a -> b) -> T14578.App f a -> T14578.App f b</span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext">    GHC.Base.liftA2 ::</span>
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<pre style="margin: 0;">-<span id="LC65" class="line" lang="plaintext">      forall (a :: TYPE GHC.Types.LiftedRep)</span>
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<pre style="margin: 0;">-<span id="LC66" class="line" lang="plaintext">             (b :: TYPE GHC.Types.LiftedRep)</span>
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<pre style="margin: 0;">-<span id="LC67" class="line" lang="plaintext">             (c :: TYPE GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="plaintext">      forall (a :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep)</span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext">             (b :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep)</span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext">             (c :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="plaintext">      (a -> b -> c) -> T14578.App f a -> T14578.App f b -> T14578.App f c</span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="plaintext">    (GHC.Base.*>) ::</span>
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="plaintext">      forall (a :: TYPE GHC.Types.LiftedRep)</span>
</pre>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="plaintext">             (b :: TYPE GHC.Types.LiftedRep).</span>
</pre>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="plaintext">      forall (a :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep)</span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="plaintext">             (b :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="plaintext">      T14578.App f a -> T14578.App f b -> T14578.App f b</span>
</pre>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="plaintext">    (GHC.Base.<*) ::</span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="plaintext">      forall (a :: TYPE GHC.Types.LiftedRep)</span>
</pre>
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<pre style="margin: 0;">-<span id="LC75" class="line" lang="plaintext">             (b :: TYPE GHC.Types.LiftedRep).</span>
</pre>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="plaintext">      forall (a :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep)</span>
</pre>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext">             (b :: TYPE <span class="idiff left right">'</span>GHC.Types.LiftedRep).</span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="plaintext">      T14578.App f a -> T14578.App f b -> T14578.App f a</span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="plaintext">    GHC.Base.pure</span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="plaintext">      = GHC.Prim.coerce</span>
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<br>
</li>
<li id="1ba015f3ba3d29833c39cd76809b7794c6f137db">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7802fa17a9a1a0f02fbf95170c13d7a9711a681e#1ba015f3ba3d29833c39cd76809b7794c6f137db"><strong>testsuite/tests/deriving/should_compile/T14579.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext">      T14579.Glurp a -> T14579.Glurp a -> GHC.Types.Bool</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">    (GHC.Classes.==)</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">      = GHC.Prim.coerce</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext">          @(T14579.Wat @a (Data.Proxy.Proxy @a)</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext">            -> T14579.Wat @a (Data.Proxy.Proxy @a) -> GHC.Types.Bool)</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">          @(T14579.Wat @a (<span class="idiff left right">'</span>Data.Proxy.Proxy @a)</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">            -> T14579.Wat @a (<span class="idiff left right">'</span>Data.Proxy.Proxy @a) -> GHC.Types.Bool)</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext">          @(T14579.Glurp a -> T14579.Glurp a -> GHC.Types.Bool)</span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext">          ((GHC.Classes.==) @(T14579.Wat @a (Data.Proxy.Proxy @a)))</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">          ((GHC.Classes.==) @(T14579.Wat @a (<span class="idiff left right">'</span>Data.Proxy.Proxy @a)))</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext">    (GHC.Classes./=)</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext">      = GHC.Prim.coerce</span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext">          @(T14579.Wat @a (Data.Proxy.Proxy @a)</span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext">            -> T14579.Wat @a (Data.Proxy.Proxy @a) -> GHC.Types.Bool)</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext">          @(T14579.Wat @a (<span class="idiff left right">'</span>Data.Proxy.Proxy @a)</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">            -> T14579.Wat @a (<span class="idiff left right">'</span>Data.Proxy.Proxy @a) -> GHC.Types.Bool)</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext">          @(T14579.Glurp a -> T14579.Glurp a -> GHC.Types.Bool)</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext">          ((GHC.Classes./=) @(T14579.Wat @a (Data.Proxy.Proxy @a)))</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext">          ((GHC.Classes./=) @(T14579.Wat @a (<span class="idiff left right">'</span>Data.Proxy.Proxy @a)))</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">  </span>
</pre>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">  instance forall a (x :: Data.Proxy.Proxy a).</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext">           GHC.Classes.Eq a =></span>
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</li>
<li id="9e5a5679ace50208fd0fe812a9501a789cea6a71">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7802fa17a9a1a0f02fbf95170c13d7a9711a681e#9e5a5679ace50208fd0fe812a9501a789cea6a71"><strong>testsuite/tests/deriving/should_fail/T15073.stderr</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3" 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">@@ -3,7 +3,7 @@ T15073.hs:8:12: error:</td>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext">    • Illegal unboxed tuple type as function argument: (# Foo a #)</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">      Perhaps you intended to use UnboxedTuples</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">    • In the type signature:</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext">        p :: Foo a -> Unit# @GHC.Types.LiftedRep (Foo a)</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">        p :: Foo a -> Unit# @<span class="idiff left right">'</span>GHC.Types.LiftedRep (Foo a)</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext">      When typechecking the code for ‘p’</span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="8" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext">        in a derived instance for ‘P (Foo a)’:</span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="9" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">        To see the code I am typechecking, use -ddump-deriv</span>
</pre>
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