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<h3>
Ryan Scott pushed to branch wip/T18914
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/6abe3b2d646a2aeaa29fe058ef3a6ac2cf49f8ef">6abe3b2d</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-11-19T15:53:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use HsOuterExplicit in instance sigs in deriving-generated code
Issue #18914 revealed that `GeneralizedNewtypeDeriving` would generate code
that mentions unbound type variables, which is dangerously fragile. The
problem (and fix) is described in the new `Wrinkle: Use HsOuterExplicit`
in `Note [GND and QuantifiedConstraints]`. The gist of it: make sure to
put the top-level `forall`s in `deriving`-generated instance signatures in an
`HsOuterExplicit` to ensure that they scope over the bodies of methods
correctly. A side effect of this process is that it will expand any type
synonyms in the instance signature, which will surface any `forall`s that
are hidden underneath type synonyms (such as in the test case for #18914).
While I was in town, I also performed some maintenance on `NewHsTypeX`, which
powers `GeneralizedNewtypeDeriving`:
* I renamed `NewHsTypeX` to `HsCoreTy`, which more accurately describes its
intended purpose (#15706). I also made `HsCoreTy` a type synonym instead of
a newtype, as making it a distinct data type wasn't buying us much.
* To make sure that mistakes similar to #18914 do not occur later, I added an
additional validity check when renaming `HsCoreTy`s that complains if an
`HsCoreTy`s contains an out-of-scope type variable. See the new
`Note [Renaming HsCoreTys]` in `GHC.Rename.HsType` for the details.
Fixes #15706. Fixes #18914. Bumps the `haddock` submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b826244aaf61cf753449186761e0ad59c4f74eec">b826244a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-11-19T15:53:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T14702 as fragile on Windows
See #18953.
</pre>
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<h4>11 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#018be522bc4813b147a1525e4f96a7a493207d96">
compiler/GHC/Hs/Type.hs
</a>
</li>
<li class="file-stats">
<a href="#892acbb198a9095c917740d3c1297b56df4e3b7e">
compiler/GHC/Rename/HsType.hs
</a>
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<li class="file-stats">
<a href="#3aa56839e36b2219f9ad54f5646ef3005da9c672">
compiler/GHC/Tc/Deriv/Generate.hs
</a>
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<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<li class="file-stats">
<a href="#eade747fa0a15693c67617629e286714fce958e4">
compiler/GHC/Tc/Gen/Sig.hs
</a>
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<li class="file-stats">
<a href="#e63425e031ffe9350ee6b1687e506aaea75d11e1">
compiler/GHC/Tc/TyCl/Instance.hs
</a>
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<li class="file-stats">
<a href="#d67e8c37b660b851784cafe36eb0327428012ff0">
testsuite/tests/deriving/should_compile/T14578.stderr
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</li>
<li class="file-stats">
<a href="#6c3a9e0a20f8145c45cc4c63b44430dd29ba7555">
<span class="new-file">
+
testsuite/tests/deriving/should_compile/T18914.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#e7bc29da08da2be1b3bd264c751322dc3e8c1905">
testsuite/tests/deriving/should_compile/all.T
</a>
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<li class="file-stats">
<a href="#5ced844c5529162410276a1236ca9b8e7186490c">
testsuite/tests/rts/all.T
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<li class="file-stats">
<a href="#46ddb8dda2edd2df4717a3285e83997fc812a347">
utils/haddock
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</ul>
<h4>Changes:</h4>
<li id="018be522bc4813b147a1525e4f96a7a493207d96">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d08443b3dd6a5343b6485f19a68eae158594446...b826244aaf61cf753449186761e0ad59c4f74eec#018be522bc4813b147a1525e4f96a7a493207d96"><strong>compiler/GHC/Hs/Type.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">@@ -24,7 +24,7 @@ module GHC.Hs.Type (</td>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsArrow</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">arrowToHsType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hsLinear</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsUnrestricted</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUnrestricted</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsType</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NewHsTypeX</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff right">)</span>,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsKind</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsKind</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsType</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">HsCoreTy</span></span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsKind</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsKind</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsForAllTelescope</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">HsTyVarBndr</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LHsQTyVars</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsOuterTyVarBndrs</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">HsOuterFamEqnTyVarBndrs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsOuterSigTyVarBndrs</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1039" 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="1039" 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">@@ -1039,12 +1039,6 @@ data HsType pass</td>
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For details on above see note [Api annotations] in GHC.Parser.Annotation</span></span>
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1042" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | HsCoreTy (XCoreTy pass) Type -- An escape hatch for tunnelling a *closed*</span></span>
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<pre style="margin: 0;">-<span id="LC1043" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- -- Core Type through HsSyn.</span></span>
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1044
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<pre style="margin: 0;">-<span id="LC1044" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- -- ^ - 'GHC.Parser.Annotation.AnnKeywordId' : None</span></span>
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<pre style="margin: 0;">-<span id="LC1045" class="line" lang="haskell"></span>
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1046
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<pre style="margin: 0;">-<span id="LC1046" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For details on above see note [Api annotations] in GHC.Parser.Annotation</span></span>
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1047
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<pre style="margin: 0;">-<span id="LC1047" class="line" lang="haskell"></span>
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1048
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsExplicitListTy</span> <span class="c1" style="color: #998; font-style: italic;">-- A promoted explicit list</span></span>
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1049
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XExplicitListTy</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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1050
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1044
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PromotionFlag</span> <span class="c1" style="color: #998; font-style: italic;">-- whether explicitly promoted, for pretty printer</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">@@ -1077,16 +1071,13 @@ data HsType pass</td>
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1077
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1071
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">XHsType</span></span>
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1078
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1072
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XXType</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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1079
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1073
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"></span>
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1080
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<pre style="margin: 0;">-<span id="LC1080" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">NewHsTypeX</span></span>
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1081
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<pre style="margin: 0;">-<span id="LC1081" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NHsCoreTy</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- An escape hatch for tunnelling a *closed*</span></span>
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1082
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<pre style="margin: 0;">-<span id="LC1082" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Core Type through HsSyn.</span></span>
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1083
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<pre style="margin: 0;">-<span id="LC1083" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also Note [Typechecking NHsCoreTys] in</span></span>
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1084
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<pre style="margin: 0;">-<span id="LC1084" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Tc.Gen.HsType.</span></span>
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1085
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<pre style="margin: 0;">-<span id="LC1085" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Data</span></span>
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1086
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<pre style="margin: 0;">-<span id="LC1086" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ - 'GHC.Parser.Annotation.AnnKeywordId' : None</span></span>
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1087
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<pre style="margin: 0;">-<span id="LC1087" class="line" lang="haskell"></span>
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1088
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<pre style="margin: 0;">-<span id="LC1088" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">NewHsTypeX</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1089
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<pre style="margin: 0;">-<span id="LC1089" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NHsCoreTy</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;">ppr</span> <span class="n" style="color: #333;">ty</span></span>
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1074
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<pre style="margin: 0;">+<span id="LC1074" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- An escape hatch for tunnelling a Core 'Type' through 'HsType'.</span></span>
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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For more details on how this works, see:</span></span>
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1076
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<pre style="margin: 0;">+<span id="LC1076" 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="LC1077" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @Note [Renaming HsCoreTys]@ in "GHC.Rename.HsType"</span></span>
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1078
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @Note [Typechecking HsCoreTys]@ in "GHC.Tc.Gen.HsType"</span></span>
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1080
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">HsCoreTy</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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1090
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1081
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"></span>
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1091
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1082
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<pre style="margin: 0;"> <span id="LC1082" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XForAllTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</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;">NoExtField</span></span>
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1092
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1083
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<pre style="margin: 0;"> <span id="LC1083" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XQualTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</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;">NoExtField</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">@@ -1124,7 +1115,7 @@ type instance XTyLit (GhcPass _) = NoExtField</td>
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1124
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1115
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<pre style="margin: 0;"> <span id="LC1115" class="line" lang="haskell"></span>
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1125
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1116
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<pre style="margin: 0;"> <span id="LC1116" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XWildCardTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</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;">NoExtField</span></span>
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1126
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1117
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<pre style="margin: 0;"> <span id="LC1117" class="line" lang="haskell"></span>
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1127
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<pre style="margin: 0;">-<span id="LC1127" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XXType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</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;"><span class="idiff left right">NewHsTypeX</span></span></span>
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1118
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<pre style="margin: 0;">+<span id="LC1118" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XXType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</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;"><span class="idiff left right">HsCoreTy</span></span></span>
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1128
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1119
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<pre style="margin: 0;"> <span id="LC1119" class="line" lang="haskell"></span>
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1129
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1120
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<pre style="margin: 0;"> <span id="LC1120" class="line" lang="haskell"></span>
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1121
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<pre style="margin: 0;"> <span id="LC1121" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Literal source text] in GHC.Types.Basic for SourceText fields in</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">@@ -2250,7 +2241,7 @@ hsTypeNeedsParens p = go_hs_ty</td>
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2250
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2241
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<pre style="margin: 0;"> <span id="LC2241" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsOpTy</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">opPrec</span></span>
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2251
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2242
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<pre style="margin: 0;"> <span id="LC2242" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsParTy</span><span class="p">{})</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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2252
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2243
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<pre style="margin: 0;"> <span id="LC2243" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsDocTy</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;">t</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;">go_hs_ty</span> <span class="n" style="color: #333;">t</span></span>
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2253
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<pre style="margin: 0;">-<span id="LC2253" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NHsCoreTy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="p"><span class="idiff right">))</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_core_ty</span> <span class="n" style="color: #333;">ty</span></span>
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2244
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<pre style="margin: 0;">+<span id="LC2244" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="n" style="color: #333;"><span class="idiff left">ty</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_core_ty</span> <span class="n" style="color: #333;">ty</span></span>
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2245
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<pre style="margin: 0;"> <span id="LC2245" class="line" lang="haskell"></span>
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2246
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<pre style="margin: 0;"> <span id="LC2246" class="line" lang="haskell"> <span class="n" style="color: #333;">go_core_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span><span class="p">{})</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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2256
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2247
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<pre style="margin: 0;"> <span id="LC2247" class="line" lang="haskell"> <span class="n" style="color: #333;">go_core_ty</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;">p</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">appPrec</span></span>
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<li id="892acbb198a9095c917740d3c1297b56df4e3b7e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d08443b3dd6a5343b6485f19a68eae158594446...b826244aaf61cf753449186761e0ad59c4f74eec#892acbb198a9095c917740d3c1297b56df4e3b7e"><strong>compiler/GHC/Rename/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">@@ -39,6 +39,7 @@ import GHC.Prelude</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Rename</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Splice</span><span class="p">(</span> <span class="n" style="color: #333;">rnSpliceType</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.FVs</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfTypeList</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Env</span></span>
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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">@@ -48,6 +49,7 @@ import GHC.Rename.Utils ( HsDocContext(..), inHsDocContext, withHsDocContext</td>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkShadowedRdrNames</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Fixity</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">lookupFieldFixityRn</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupFixityRn</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupTyFixityRn</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Unbound</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">notInScopeErr</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC54" 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="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</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">@@ -634,10 +636,20 @@ rnHsTyKi env (HsDocTy _ ty haddock_doc)</td>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsTyKi</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC637" 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;">HsDocTy</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">ty'</span> <span class="n" style="color: #333;">haddock_doc</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC637" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsTyKi</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NHsCoreTy</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC638" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NHsCoreTy</span> <span class="n" style="color: #333;">ty</span><span class="p">),</span> <span class="n" style="color: #333;">emptyFVs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC639" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The emptyFVs probably isn't quite right</span></span>
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<pre style="margin: 0;">-<span id="LC640" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but I don't think it matters</span></span>
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<pre style="margin: 0;">+<span id="LC639" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Renaming HsCoreTys]</span></span>
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsTyKi</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">check_in_scope</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">nameRdrName</span><span class="p">)</span> <span class="n" style="color: #333;">fvs_list</span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"> <span class="n" style="color: #333;">fvs_list</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getName</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tyCoVarsOfTypeList</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFVs</span> <span class="n" style="color: #333;">fvs_list</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"> <span class="n" style="color: #333;">check_in_scope</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"> <span class="n" style="color: #333;">check_in_scope</span> <span class="n" style="color: #333;">rdr_name</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="LC649" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupLocalOccRn_maybe</span> <span class="n" style="color: #333;">rdr_name</span></span>
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">isNothing</span> <span class="n" style="color: #333;">mb_name</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"> <span class="n" style="color: #333;">addErr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="p">(</span><span class="n" style="color: #333;">rtke_ctxt</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"> <span class="n" style="color: #333;">notInScopeErr</span> <span class="n" style="color: #333;">rdr_name</span></span>
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<pre style="margin: 0;"> <span id="LC653" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsTyKi</span> <span class="n" style="color: #333;">env</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;">HsExplicitListTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ip</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC655" 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;">data_kinds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">DataKinds</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">@@ -661,6 +673,39 @@ rnHsArrow _env (HsLinearArrow u) = return (HsLinearArrow u, emptyFVs)</td>
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<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsArrow</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExplicitMult</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC674" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">mult</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExplicitMult</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">mult</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">rnLHsTyKi</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC675" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;">+<span id="LC677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Renaming HsCoreTys]</span></span>
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<pre style="margin: 0;">+<span id="LC678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">HsCoreTy is an escape hatch that allows embedding Core Types in HsTypes.</span></span>
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As such, there's not much to be done in order to rename an HsCoreTy,</span></span>
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">since it's already been renamed to some extent. However, in an attempt to</span></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">detect ill-formed HsCoreTys, the renamer checks to see if all free type</span></span>
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables in an HsCoreTy are in scope. To see why this can matter, consider</span></span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this example from #18914:</span></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type T f = forall a. f a</span></span>
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C f where</span></span>
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m :: T f</span></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N f a = MkN (f a)</span></span>
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> deriving C</span></span>
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because of #18914, a previous GHC would generate the following code:</span></span>
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695
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C f => C (N f) where</span></span>
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697
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m :: T (N f)</span></span>
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698
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m = coerce @(f a) -- The type within @(...) is an HsCoreTy</span></span>
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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @(N f a) -- So is this</span></span>
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700
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (m @f)</span></span>
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701
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<pre style="margin: 0;">+<span id="LC701" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are two HsCoreTys in play—(f a) and (N f a)—both of which have</span></span>
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`f` and `a` as free type variables. The `f` is in scope from the instance head,</span></span>
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but `a` is completely unbound, which is what led to #18914. To avoid this sort</span></span>
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<pre style="margin: 0;">+<span id="LC705" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of mistake going forward, the renamer will now detect that `a` is unbound and</span></span>
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<pre style="margin: 0;">+<span id="LC706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">throw an error accordingly.</span></span>
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<pre style="margin: 0;">+<span id="LC707" 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="LC708" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC709" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------</span></span>
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710
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RnTyKiEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC711" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyVar</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rdr_name</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d08443b3dd6a5343b6485f19a68eae158594446...b826244aaf61cf753449186761e0ad59c4f74eec#3aa56839e36b2219f9ad54f5646ef3005da9c672"><strong>compiler/GHC/Tc/Deriv/Generate.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">@@ -1819,6 +1819,94 @@ a truly higher-rank type like so:</td>
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1819
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1819
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<pre style="margin: 0;"> <span id="LC1819" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then the same situation will arise again. But at least it won't arise for the</span></span>
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1820
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1820
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<pre style="margin: 0;"> <span id="LC1820" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">common case of methods with ordinary, prenex-quantified types.</span></span>
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1821
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1821
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<pre style="margin: 0;"> <span id="LC1821" class="line" lang="haskell"></span>
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1822
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<pre style="margin: 0;">+<span id="LC1822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-----</span></span>
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1823
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<pre style="margin: 0;">+<span id="LC1823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Wrinkle: Use HsOuterExplicit</span></span>
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1824
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<pre style="margin: 0;">+<span id="LC1824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-----</span></span>
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1825
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<pre style="margin: 0;">+<span id="LC1825" class="line" lang="haskell"></span>
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1826
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<pre style="margin: 0;">+<span id="LC1826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">One minor complication with the plan above is that we need to ensure that the</span></span>
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1827
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<pre style="margin: 0;">+<span id="LC1827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type variables from a method's instance signature properly scope over the body</span></span>
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1828
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<pre style="margin: 0;">+<span id="LC1828" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of the method. For example, recall:</span></span>
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1829
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<pre style="margin: 0;">+<span id="LC1829" class="line" lang="haskell"></span>
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1830
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<pre style="margin: 0;">+<span id="LC1830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance (C m, forall p q. Coercible p q => Coercible (m p) (m q)) =></span></span>
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1831
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<pre style="margin: 0;">+<span id="LC1831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> C (T m) where</span></span>
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1832
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<pre style="margin: 0;">+<span id="LC1832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> join :: forall a. T m (T m a) -> T m a</span></span>
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1833
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<pre style="margin: 0;">+<span id="LC1833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> join = coerce @( m (m a) -> m a)</span></span>
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1834
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<pre style="margin: 0;">+<span id="LC1834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @(T m (T m a) -> T m a)</span></span>
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1835
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<pre style="margin: 0;">+<span id="LC1835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> join</span></span>
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1836
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<pre style="margin: 0;">+<span id="LC1836" class="line" lang="haskell"></span>
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1837
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<pre style="margin: 0;">+<span id="LC1837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the example above, it is imperative that the `a` in the instance signature</span></span>
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1838
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<pre style="margin: 0;">+<span id="LC1838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for `join` scope over the body of `join` by way of ScopedTypeVariables.</span></span>
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1839
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<pre style="margin: 0;">+<span id="LC1839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This might sound obvious, but note that in gen_Newtype_binds, which is</span></span>
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1840
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<pre style="margin: 0;">+<span id="LC1840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">responsible for generating the code above, the type in `join`'s instance</span></span>
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1841
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<pre style="margin: 0;">+<span id="LC1841" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">signature is given as a Core type, whereas gen_Newtype_binds will eventually</span></span>
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1842
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<pre style="margin: 0;">+<span id="LC1842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">produce HsBinds (i.e., source Haskell) that is renamed and typechecked. We</span></span>
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1843
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<pre style="margin: 0;">+<span id="LC1843" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">must ensure that `a` is in scope over the body of `join` during renaming</span></span>
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1844
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<pre style="margin: 0;">+<span id="LC1844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or else the generated code will be rejected.</span></span>
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1845
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<pre style="margin: 0;">+<span id="LC1845" class="line" lang="haskell"></span>
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1846
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<pre style="margin: 0;">+<span id="LC1846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In short, we need to convert the instance signature from a Core type to an</span></span>
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1847
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<pre style="margin: 0;">+<span id="LC1847" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">HsType (i.e., a source Haskell type). Two possible options are:</span></span>
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1848
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<pre style="margin: 0;">+<span id="LC1848" class="line" lang="haskell"></span>
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1849
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<pre style="margin: 0;">+<span id="LC1849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Convert the Core type entirely to an HsType (i.e., a source Haskell type).</span></span>
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1850
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<pre style="margin: 0;">+<span id="LC1850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Embed the entire Core type using HsCoreTy.</span></span>
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1851
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<pre style="margin: 0;">+<span id="LC1851" class="line" lang="haskell"></span>
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1852
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<pre style="margin: 0;">+<span id="LC1852" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Neither option is quite satisfactory:</span></span>
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1853
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<pre style="margin: 0;">+<span id="LC1853" class="line" lang="haskell"></span>
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1854
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<pre style="margin: 0;">+<span id="LC1854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Converting a Core type to an HsType in full generality is surprisingly</span></span>
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1855
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<pre style="margin: 0;">+<span id="LC1855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> complicated. Previous versions of GHCs did this, but it was the source of</span></span>
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1856
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<pre style="margin: 0;">+<span id="LC1856" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> numerous bugs (see #14579 and #16518, for instance).</span></span>
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1857
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<pre style="margin: 0;">+<span id="LC1857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. While HsCoreTy is much less complicated that option (1), it's not quite</span></span>
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1858
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<pre style="margin: 0;">+<span id="LC1858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> what we want. In order for `a` to be in scope over the body of `join` during</span></span>
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1859
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<pre style="margin: 0;">+<span id="LC1859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> renaming, the `forall` must be contained in an HsOuterExplicit.</span></span>
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1860
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<pre style="margin: 0;">+<span id="LC1860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (See Note [Lexically scoped type variables] in GHC.Hs.Type.) HsCoreTy</span></span>
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1861
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<pre style="margin: 0;">+<span id="LC1861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bypasses HsOuterExplicit, so this won't work either.</span></span>
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1862
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<pre style="margin: 0;">+<span id="LC1862" class="line" lang="haskell"></span>
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1863
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<pre style="margin: 0;">+<span id="LC1863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As a compromise, we adopt a combination of the two options above:</span></span>
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1864
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<pre style="margin: 0;">+<span id="LC1864" class="line" lang="haskell"></span>
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1865
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<pre style="margin: 0;">+<span id="LC1865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Split apart the top-level ForAllTys in the instance signature's Core type,</span></span>
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1866
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<pre style="margin: 0;">+<span id="LC1866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Convert the top-level ForAllTys to an HsOuterExplicit, and</span></span>
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1867
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<pre style="margin: 0;">+<span id="LC1867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Embed the remainder of the Core type in an HsCoreTy.</span></span>
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1868
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<pre style="margin: 0;">+<span id="LC1868" class="line" lang="haskell"></span>
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1869
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<pre style="margin: 0;">+<span id="LC1869" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This retains most of the simplicity of option (2) while still ensuring that</span></span>
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1870
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<pre style="margin: 0;">+<span id="LC1870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the type variables are correctly scoped.</span></span>
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1871
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<pre style="margin: 0;">+<span id="LC1871" class="line" lang="haskell"></span>
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1872
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<pre style="margin: 0;">+<span id="LC1872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that splitting apart top-level ForAllTys will expand any type synonyms</span></span>
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1873
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<pre style="margin: 0;">+<span id="LC1873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the Core type itself. This ends up being important to fix a corner case</span></span>
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1874
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<pre style="margin: 0;">+<span id="LC1874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">observed in #18914. Consider this example:</span></span>
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1875
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<pre style="margin: 0;">+<span id="LC1875" class="line" lang="haskell"></span>
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1876
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<pre style="margin: 0;">+<span id="LC1876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type T f = forall a. f a</span></span>
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1877
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<pre style="margin: 0;">+<span id="LC1877" class="line" lang="haskell"></span>
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1878
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<pre style="margin: 0;">+<span id="LC1878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C f where</span></span>
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1879
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<pre style="margin: 0;">+<span id="LC1879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m :: T f</span></span>
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1880
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<pre style="margin: 0;">+<span id="LC1880" class="line" lang="haskell"></span>
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1881
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<pre style="margin: 0;">+<span id="LC1881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype N f a = MkN (f a)</span></span>
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1882
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<pre style="margin: 0;">+<span id="LC1882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> deriving C</span></span>
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1883
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<pre style="margin: 0;">+<span id="LC1883" class="line" lang="haskell"></span>
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1884
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<pre style="margin: 0;">+<span id="LC1884" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">What code should `deriving C` generate? It will have roughly the following</span></span>
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1885
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<pre style="margin: 0;">+<span id="LC1885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">shape:</span></span>
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1886
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<pre style="margin: 0;">+<span id="LC1886" class="line" lang="haskell"></span>
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1887
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<pre style="margin: 0;">+<span id="LC1887" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C f => C (N f) where</span></span>
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1888
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<pre style="margin: 0;">+<span id="LC1888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m :: T (N f)</span></span>
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1889
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<pre style="margin: 0;">+<span id="LC1889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m = coerce @(...) (...) (m @f)</span></span>
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1890
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<pre style="margin: 0;">+<span id="LC1890" class="line" lang="haskell"></span>
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1891
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<pre style="margin: 0;">+<span id="LC1891" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">At a minimum, we must instantiate `coerce` with `@(T f)` and `@(T (N f))`, but</span></span>
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1892
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<pre style="margin: 0;">+<span id="LC1892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with the `forall`s removed in order to make them monotypes. However, the</span></span>
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1893
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<pre style="margin: 0;">+<span id="LC1893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`forall` is hidden underneath the `T` type synonym, so we must first expand `T`</span></span>
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1894
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<pre style="margin: 0;">+<span id="LC1894" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">before we can strip of the `forall`. Expanding `T`, we get</span></span>
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1895
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<pre style="margin: 0;">+<span id="LC1895" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`coerce @(forall a. f a) @(forall a. N f a)`, and after omitting the `forall`s,</span></span>
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1896
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<pre style="margin: 0;">+<span id="LC1896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we get `coerce @(f a) @(N f a)`.</span></span>
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1897
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<pre style="margin: 0;">+<span id="LC1897" class="line" lang="haskell"></span>
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1898
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<pre style="margin: 0;">+<span id="LC1898" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We can't stop there, however, or else we would end up with this code:</span></span>
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1899
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<pre style="margin: 0;">+<span id="LC1899" class="line" lang="haskell"></span>
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1900
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<pre style="margin: 0;">+<span id="LC1900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C f => C (N f) where</span></span>
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1901
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<pre style="margin: 0;">+<span id="LC1901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m :: T (N f)</span></span>
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1902
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<pre style="margin: 0;">+<span id="LC1902" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m = coerce @(f a) @(N f a) (m @f)</span></span>
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1903
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<pre style="margin: 0;">+<span id="LC1903" class="line" lang="haskell"></span>
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1904
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<pre style="margin: 0;">+<span id="LC1904" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Notice that the type variable `a` is completely unbound. In order to make sure</span></span>
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1905
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<pre style="margin: 0;">+<span id="LC1905" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that `a` is in scope, we must /also/ expand the `T` in `m :: T (N f)` to get</span></span>
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1906
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<pre style="margin: 0;">+<span id="LC1906" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`m :: forall a. N f a`. Fortunately, we will do just that in the plan outlined</span></span>
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1907
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<pre style="margin: 0;">+<span id="LC1907" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">above, since when we split off the top-level ForAllTys in the instance</span></span>
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1908
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<pre style="margin: 0;">+<span id="LC1908" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">signature, we must first expand the T type synonym.</span></span>
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1909
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<pre style="margin: 0;">+<span id="LC1909" class="line" lang="haskell"></span>
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1822
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1910
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<pre style="margin: 0;"> <span id="LC1910" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [GND and ambiguity]</span></span>
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1823
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1911
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<pre style="margin: 0;"> <span id="LC1911" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1824
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1912
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<pre style="margin: 0;"> <span id="LC1912" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We make an effort to make the code generated through GND be robust w.r.t.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1891" 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="1979" 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">@@ -1891,13 +1979,30 @@ gen_Newtype_binds loc cls inst_tvs inst_tys rhs_ty</td>
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1891
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1979
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<pre style="margin: 0;"> <span id="LC1979" class="line" lang="haskell"> <span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- The derived instance signature, e.g.,</span></span>
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1892
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1980
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<pre style="margin: 0;"> <span id="LC1980" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1893
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1981
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<pre style="margin: 0;"> <span id="LC1981" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- op :: forall c. a -> [T x] -> c -> Int</span></span>
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1982
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<pre style="margin: 0;">+<span id="LC1982" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1983
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<pre style="margin: 0;">+<span id="LC1983" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make sure that `forall c` is in an HsOuterExplicit so that it</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1984" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1984
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<pre style="margin: 0;">+<span id="LC1984" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- scopes over the body of `op`. See "Wrinkle: Use HsOuterExplicit" in</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1985" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1985
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<pre style="margin: 0;">+<span id="LC1985" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [GND and QuantifiedConstraints].</span></span>
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1894
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<td class="diff-line-num new_line" data-linenumber="1986" 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">
1986
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<pre style="margin: 0;"> <span id="LC1986" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">ClassOpSig</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">[</span><span class="n" style="color: #333;">loc_meth_RDR</span><span class="p">]</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1895" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1895
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<td class="diff-line-num new_line old" data-linenumber="1987" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1895" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkHsImplicitSigType</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">nlHsCoreTy</span> <span class="n" style="color: #333;">to_ty</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1896" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1987" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1987
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<pre style="margin: 0;">+<span id="LC1987" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkHsExplicitSigType</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1988" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1988
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<pre style="margin: 0;">+<span id="LC1988" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mk_hs_tvb</span> <span class="n" style="color: #333;">to_tvbs</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1989" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1989
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<pre style="margin: 0;">+<span id="LC1989" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">nlHsCoreTy</span> <span class="n" style="color: #333;">to_rho</span><span class="p">)</span></span>
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1896
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1990
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<pre style="margin: 0;"> <span id="LC1990" class="line" lang="haskell"> <span class="p">)</span></span>
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1897
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<td class="diff-line-num new_line" data-linenumber="1991" 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">
1991
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<pre style="margin: 0;"> <span id="LC1991" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1898
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<td class="diff-line-num new_line" data-linenumber="1992" 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">
1992
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<pre style="margin: 0;"> <span id="LC1992" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">from_ty</span> <span class="n" style="color: #333;">to_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoerceClassMethEqn</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">inst_tvs</span> <span class="n" style="color: #333;">inst_tys</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">meth_id</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1899" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1899
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<td class="diff-line-num new_line old" data-linenumber="1993" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1899" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">from_tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitSigmaTy</span> <span class="n" style="color: #333;">from_ty</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1900" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1900
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<td class="diff-line-num new_line old" data-linenumber="1993" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1900" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">to_tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitSigmaTy</span> <span class="n" style="color: #333;">to_ty</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1901" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1993" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1993
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<pre style="margin: 0;">+<span id="LC1993" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">from_tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitSigmaTy</span> <span class="n" style="color: #333;">from_ty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1994" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1994
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<pre style="margin: 0;">+<span id="LC1994" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">to_tvbs</span><span class="p">,</span> <span class="n" style="color: #333;">to_rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAllInvisTVBinders</span> <span class="n" style="color: #333;">to_ty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1995" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1995
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<pre style="margin: 0;">+<span id="LC1995" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">to_tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitPhiTy</span> <span class="n" style="color: #333;">to_rho</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1996" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1996
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<pre style="margin: 0;">+<span id="LC1996" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The use of tcSplitForAllInvisTVBinders above expands type synonyms,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1997" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1997
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<pre style="margin: 0;">+<span id="LC1997" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- which is important to ensure correct type variable scoping.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1998" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1998
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<pre style="margin: 0;">+<span id="LC1998" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See "Wrinkle: Use HsOuterExplicit" in</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1999" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1999
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<pre style="margin: 0;">+<span id="LC1999" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [GND and QuantifiedConstraints].</span></span>
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2000
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<pre style="margin: 0;">+<span id="LC2000" class="line" lang="haskell"></span>
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2001
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<pre style="margin: 0;">+<span id="LC2001" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_hs_tvb</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="n" style="color: #333;">flag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span> <span class="n" style="color: #333;">flag</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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2002
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<pre style="margin: 0;">+<span id="LC2002" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_hs_tvb</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">flag</span><span class="p">)</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="kt" style="color: #458; font-weight: 600;">KindedTyVar</span> <span class="n" style="color: #333;">noExtField</span></span>
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2003
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<pre style="margin: 0;">+<span id="LC2003" class="line" lang="haskell"> <span class="n" style="color: #333;">flag</span></span>
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2004
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<pre style="margin: 0;">+<span id="LC2004" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="p">(</span><span class="n" style="color: #333;">getRdrName</span> <span class="n" style="color: #333;">tv</span><span class="p">))</span></span>
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2005
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<pre style="margin: 0;">+<span id="LC2005" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">nlHsCoreTy</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv</span><span class="p">))</span></span>
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1901
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2006
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<pre style="margin: 0;"> <span id="LC2006" class="line" lang="haskell"></span>
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1902
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2007
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<pre style="margin: 0;"> <span id="LC2007" class="line" lang="haskell"> <span class="n" style="color: #333;">meth_RDR</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getRdrName</span> <span class="n" style="color: #333;">meth_id</span></span>
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1903
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2008
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<pre style="margin: 0;"> <span id="LC2008" class="line" lang="haskell"> <span class="n" style="color: #333;">loc_meth_RDR</span> <span class="o" style="font-weight: 600;">=</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;">meth_RDR</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1950" 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="2055" 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">@@ -1950,8 +2055,8 @@ nlHsAppType e s = noLoc (HsAppType noExtField e hs_ty)</td>
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1950
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2055
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<pre style="margin: 0;"> <span id="LC2055" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1951
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<td class="diff-line-num new_line" data-linenumber="2056" 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">
2056
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<pre style="margin: 0;"> <span id="LC2056" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkHsWildCardBndrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">parenthesizeHsType</span> <span class="n" style="color: #333;">appPrec</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">nlHsCoreTy</span> <span class="n" style="color: #333;">s</span></span>
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1952
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2057
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<pre style="margin: 0;"> <span id="LC2057" class="line" lang="haskell"></span>
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1953
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<pre style="margin: 0;">-<span id="LC1953" class="line" lang="haskell"><span class="n" style="color: #333;">nlHsCoreTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Type</span></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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1954
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<pre style="margin: 0;">-<span id="LC1954" class="line" lang="haskell"><span class="n" style="color: #333;">nlHsCoreTy</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="kt" style="color: #458; font-weight: 600;">XHsType</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">NHsCoreTy</span></span></span>
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2058
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<pre style="margin: 0;">+<span id="LC2058" class="line" lang="haskell"><span class="n" style="color: #333;">nlHsCoreTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">HsCoreTy</span></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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2059
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<pre style="margin: 0;">+<span id="LC2059" class="line" lang="haskell"><span class="n" style="color: #333;">nlHsCoreTy</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="kt" style="color: #458; font-weight: 600;">XHsType</span></span>
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1955
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2060
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<pre style="margin: 0;"> <span id="LC2060" class="line" lang="haskell"></span>
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1956
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2061
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<pre style="margin: 0;"> <span id="LC2061" class="line" lang="haskell"><span class="n" style="color: #333;">mkCoerceClassMethEqn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="c1" style="color: #998; font-style: italic;">-- the class being derived</span></span>
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1957
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2062
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<pre style="margin: 0;"> <span id="LC2062" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- the tvs in the instance head (this includes</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2079" 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="2184" 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">@@ -2079,15 +2184,15 @@ genAuxBindSpecDup loc original_rdr_name dup_spec</td>
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2079
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2184
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<pre style="margin: 0;"> <span id="LC2184" class="line" lang="haskell"><span class="n" style="color: #333;">genAuxBindSpecSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AuxBindSpec</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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2080
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2185
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<pre style="margin: 0;"> <span id="LC2185" class="line" lang="haskell"><span class="n" style="color: #333;">genAuxBindSpecSig</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">spec</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">spec</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2081
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2186
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<pre style="margin: 0;"> <span id="LC2186" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DerivCon2Tag</span> <span class="n" style="color: #333;">tycon</span> <span class="kr" style="font-weight: 600;">_</span></span>
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2082
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<pre style="margin: 0;">-<span id="LC2082" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mk_sig</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="o" style="font-weight: 600;">$</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NHsCoreTy</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">$</span></span></span>
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2187
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<pre style="margin: 0;">+<span id="LC2187" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mk_sig</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="o" style="font-weight: 600;">$</span></span>
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2083
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2188
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<pre style="margin: 0;"> <span id="LC2188" class="line" lang="haskell"> <span class="n" style="color: #333;">mkSpecSigmaTy</span> <span class="p">(</span><span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">tyConStupidTheta</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2084
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2189
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<pre style="margin: 0;"> <span id="LC2189" class="line" lang="haskell"> <span class="n" style="color: #333;">mkParentType</span> <span class="n" style="color: #333;">tycon</span> <span class="p">`</span><span class="n" style="color: #333;">mkVisFunTyMany</span><span class="p">`</span> <span class="n" style="color: #333;">intPrimTy</span></span>
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2085
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2190
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<pre style="margin: 0;"> <span id="LC2190" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DerivTag2Con</span> <span class="n" style="color: #333;">tycon</span> <span class="kr" style="font-weight: 600;">_</span></span>
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2086
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2191
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<pre style="margin: 0;"> <span id="LC2191" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mk_sig</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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2087
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<pre style="margin: 0;">-<span id="LC2087" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NHsCoreTy</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mkSpecForAllTys</span> <span class="p">(</span><span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2192
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<pre style="margin: 0;">+<span id="LC2192" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkSpecForAllTys</span> <span class="p">(</span><span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2088
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2193
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<pre style="margin: 0;"> <span id="LC2193" class="line" lang="haskell"> <span class="n" style="color: #333;">intTy</span> <span class="p">`</span><span class="n" style="color: #333;">mkVisFunTyMany</span><span class="p">`</span> <span class="n" style="color: #333;">mkParentType</span> <span class="n" style="color: #333;">tycon</span></span>
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2089
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2194
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<pre style="margin: 0;"> <span id="LC2194" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DerivMaxTag</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span></span>
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2090
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<pre style="margin: 0;">-<span id="LC2090" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mk_sig</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;">XHsType</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NHsCoreTy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">intTy</span></span><span class="p"><span class="idiff right">)</span>))</span></span>
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2195
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<pre style="margin: 0;">+<span id="LC2195" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mk_sig</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;">XHsType</span> <span class="n" style="color: #333;"><span class="idiff left right">intTy</span></span><span class="p">))</span></span>
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2091
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2196
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<pre style="margin: 0;"> <span id="LC2196" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DerivDataDataType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span></span>
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2092
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2197
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<pre style="margin: 0;"> <span id="LC2197" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mk_sig</span> <span class="p">(</span><span class="n" style="color: #333;">nlHsTyVar</span> <span class="n" style="color: #333;">dataType_RDR</span><span class="p">)</span></span>
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2093
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2198
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<pre style="margin: 0;"> <span id="LC2198" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DerivDataConstr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d08443b3dd6a5343b6485f19a68eae158594446...b826244aaf61cf753449186761e0ad59c4f74eec#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">@@ -942,8 +942,8 @@ tc_infer_hs_type mode (HsSpliceTy _ (HsSpliced _ _ (HsSplicedTy ty)))</td>
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942
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<pre style="margin: 0;"> <span id="LC942" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC943" class="line" lang="haskell"><span class="n" style="color: #333;">tc_infer_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsDocTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC944" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC945" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Typechecking <span class="idiff left right">N</span>HsCoreTys]</span></span>
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946
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"><span class="n" style="color: #333;">tc_infer_hs_type</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NHsCoreTy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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<pre style="margin: 0;">+<span id="LC945" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Typechecking HsCoreTys]</span></span>
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"><span class="n" style="color: #333;">tc_infer_hs_type</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="n" style="color: #333;"><span class="idiff left right">ty</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC947" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLclEnv</span></span>
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Raw uniques since we go from NameEnv to TvSubstEnv.</span></span>
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<pre style="margin: 0;"> <span id="LC949" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">subst_prs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Unique</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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -967,21 +967,21 @@ tc_infer_hs_type mode other_ty</td>
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<pre style="margin: 0;"> <span id="LC967" 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;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">kv</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC968" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC969" 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="LC970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Typechecking <span class="idiff left right">N</span>HsCoreTys]</span></span>
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<pre style="margin: 0;">-<span id="LC971" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<span class="idiff left right">~</span></span></span>
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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">N</span>HsCoreTy is an escape hatch that allows embedding Core Types in HsTypes.</span></span>
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973
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<pre style="margin: 0;">-<span id="LC973" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As such, there's not much to be done in order to typecheck an <span class="idiff left right">N</span>HsCoreTy,</span></span>
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<pre style="margin: 0;">+<span id="LC970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Typechecking HsCoreTys]</span></span>
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<pre style="margin: 0;">+<span id="LC971" 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="LC972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">HsCoreTy is an escape hatch that allows embedding Core Types in HsTypes.</span></span>
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As such, there's not much to be done in order to typecheck an HsCoreTy,</span></span>
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<pre style="margin: 0;"> <span id="LC974" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">since it's already been typechecked to some extent. There is one thing that</span></span>
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<pre style="margin: 0;"> <span id="LC975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we must do, however: we must substitute the type variables from the tcl_env.</span></span>
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976
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<pre style="margin: 0;"> <span id="LC976" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To see why, consider GeneralizedNewtypeDeriving, which is one of the main</span></span>
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977
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<pre style="margin: 0;">-<span id="LC977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">clients of <span class="idiff left right">N</span>HsCoreTy (example adapted from #14579):</span></span>
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">clients of HsCoreTy (example adapted from #14579):</span></span>
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978
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978
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<pre style="margin: 0;"> <span id="LC978" class="line" lang="haskell"></span>
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979
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979
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<pre style="margin: 0;"> <span id="LC979" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype T a = MkT a deriving newtype Eq</span></span>
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980
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980
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<pre style="margin: 0;"> <span id="LC980" class="line" lang="haskell"></span>
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981
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981
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<pre style="margin: 0;"> <span id="LC981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This will produce an InstInfo GhcPs that looks roughly like this:</span></span>
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982
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982
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<pre style="margin: 0;"> <span id="LC982" class="line" lang="haskell"></span>
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983
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983
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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance forall a_1. Eq a_1 => Eq (T a_1) where</span></span>
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984
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<pre style="margin: 0;">-<span id="LC984" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (==) = coerce @( a_1 -> a_1 -> Bool) -- The type within @(...) is an <span class="idiff left right">N</span>HsCoreTy</span></span>
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (==) = coerce @( a_1 -> a_1 -> Bool) -- The type within @(...) is an HsCoreTy</span></span>
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<pre style="margin: 0;"> <span id="LC985" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @(T a_1 -> T a_1 -> Bool) -- So is this</span></span>
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<pre style="margin: 0;"> <span id="LC986" 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="LC987" 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">@@ -997,9 +997,9 @@ environment (tcl_env) with [a_1 :-> a_2]. This gives us:</td>
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<pre style="margin: 0;"> <span id="LC997" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC998" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To ensure that the body of this instance is well scoped, every occurrence of</span></span>
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<pre style="margin: 0;"> <span id="LC999" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the `a` type variable should refer to a_2, the new skolem. However, the</span></span>
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<pre style="margin: 0;">-<span id="LC1000" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">N</span>HsCoreTys mention a_1, not a_2. Luckily, the tcl_env provides exactly the</span></span>
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">HsCoreTys mention a_1, not a_2. Luckily, the tcl_env provides exactly the</span></span>
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1001
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1001
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<pre style="margin: 0;"> <span id="LC1001" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitution we need ([a_1 :-> a_2]) to fix up the scoping. We apply this</span></span>
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<pre style="margin: 0;">-<span id="LC1002" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitution to each <span class="idiff left right">N</span>HsCoreTy and all is well:</span></span>
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitution to each HsCoreTy and all is well:</span></span>
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"></span>
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1004
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1004
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<pre style="margin: 0;"> <span id="LC1004" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance forall a_2. Eq a_2 => Eq (T a_2) where</span></span>
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1005
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1005
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<pre style="margin: 0;"> <span id="LC1005" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (==) = coerce @( a_2 -> a_2 -> Bool)</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">@@ -1196,7 +1196,7 @@ tc_hs_type mode ty@(HsAppTy {}) ek = tc_infer_hs_type_ek mode ty ek</td>
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1196
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1196
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<pre style="margin: 0;"> <span id="LC1196" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</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;">HsAppKindTy</span><span class="p">{})</span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_hs_type_ek</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
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1197
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1197
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<pre style="margin: 0;"> <span id="LC1197" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</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;">HsOpTy</span> <span class="p">{})</span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_hs_type_ek</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
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1198
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1198
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<pre style="margin: 0;"> <span id="LC1198" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</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;">HsKindSig</span> <span class="p">{})</span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_hs_type_ek</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
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1199
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<pre style="margin: 0;">-<span id="LC1199" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</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;">XHsType</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NHsCoreTy</span></span><span class="p"><span class="idiff right">{}))</span></span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_hs_type_ek</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
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1199
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<pre style="margin: 0;">+<span id="LC1199" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</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;">XHsType</span> <span class="p"><span class="idiff left">{})</span></span><span class="idiff right"> </span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_hs_type_ek</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
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1200
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1200
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<pre style="margin: 0;"> <span id="LC1200" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</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;">HsWildCardTy</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcAnonWildCardOcc</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
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1201
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<pre style="margin: 0;"> <span id="LC1201" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d08443b3dd6a5343b6485f19a68eae158594446...b826244aaf61cf753449186761e0ad59c4f74eec#eade747fa0a15693c67617629e286714fce958e4"><strong>compiler/GHC/Tc/Gen/Sig.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">@@ -291,7 +291,7 @@ no_anon_wc_ty lty = go lty</td>
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<pre style="margin: 0;"> <span id="LC291" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsTyLit</span><span class="p">{}</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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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsTyVar</span><span class="p">{}</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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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsStarTy</span><span class="p">{}</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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<pre style="margin: 0;">-<span id="LC294" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XHsType</span><span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NHsCoreTy</span></span><span class="p"><span class="idiff">{})</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">True</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Core type</span>, which does not have any wildcard</span></span>
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XHsType</span><span class="p"><span class="idiff left">{}</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">True</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- HsCoreTy</span>, which does not have any wildcard</span></span>
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="haskell"> <span class="n" style="color: #333;">gos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">go</span></span>
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d08443b3dd6a5343b6485f19a68eae158594446...b826244aaf61cf753449186761e0ad59c4f74eec#e63425e031ffe9350ee6b1687e506aaea75d11e1"><strong>compiler/GHC/Tc/TyCl/Instance.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">@@ -2002,7 +2002,7 @@ mkDefMethBind dfun_id clas sel_id dm_name</td>
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<pre style="margin: 0;"> <span id="LC2002" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2003" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_vta</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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2004
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<pre style="margin: 0;"> <span id="LC2004" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_vta</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsAppType</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">fun</span> <span class="p">(</span><span class="n" style="color: #333;">mkEmptyWildCardBndrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">nlHsParTy</span></span>
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<pre style="margin: 0;">-<span id="LC2005" class="line" lang="haskell"> <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="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="o" style="font-weight: 600;"><span class="idiff left">$</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NHsCoreTy</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC2005" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC2006" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: use visible type application</span></span>
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<pre style="margin: 0;"> <span id="LC2007" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Default methods in instances]</span></span>
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2008
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<pre style="margin: 0;"> <span id="LC2008" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d08443b3dd6a5343b6485f19a68eae158594446...b826244aaf61cf753449186761e0ad59c4f74eec#d67e8c37b660b851784cafe36eb0327428012ff0"><strong>testsuite/tests/deriving/should_compile/T14578.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -9,9 +9,8 @@ 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.</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> GHC.Real.Integral b =></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"> b -> T14578.Wat f g a -> T14578.Wat f g a</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> forall (b :: *).</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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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"> @(T14578.App (Data.Functor.Compose.Compose f g) a</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -39,8 +38,10 @@ Derived class instances:</td>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext"> instance GHC.Base.Functor f =></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext"> GHC.Base.Functor (T14578.App f) where</span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext"> GHC.Base.fmap ::</span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="plaintext"> forall a b. (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.<$) :: forall a b. a -> T14578.App f b -> T14578.App f a</span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext"> forall (a :: *) (b :: *).</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 :: *) (b :: *). a -> T14578.App f b -> T14578.App f a</span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"> GHC.Base.fmap</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"> = GHC.Prim.coerce</span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext"> @((a -> b) -> f a -> f b)</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">@@ -52,17 +53,19 @@ Derived class instances:</td>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext"> </span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"> instance GHC.Base.Applicative f =></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext"> GHC.Base.Applicative (T14578.App f) where</span>
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<pre style="margin: 0;">-<span id="LC55" class="line" lang="plaintext"> GHC.Base.pure :: forall <span class="idiff left right">a</span>. a -> T14578.App f a</span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext"> GHC.Base.pure :: forall <span class="idiff left right">(a :: *)</span>. a -> T14578.App f a</span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext"> (GHC.Base.<*>) ::</span>
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<pre style="margin: 0;">-<span id="LC57" class="line" lang="plaintext"> forall <span class="idiff left right">a b</span>.</span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="plaintext"> forall <span class="idiff left right">(a :: *) (b :: *)</span>.</span>
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<pre style="margin: 0;"> <span id="LC59" 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="LC60" class="line" lang="plaintext"> GHC.Base.liftA2 ::</span>
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<pre style="margin: 0;">-<span id="LC60" class="line" lang="plaintext"> forall <span class="idiff left right">a b c</span>.</span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext"> forall <span class="idiff left right">(a :: *) (b :: *) (c :: *)</span>.</span>
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<pre style="margin: 0;"> <span id="LC62" 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="LC63" class="line" lang="plaintext"> (GHC.Base.*>) ::</span>
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="plaintext"> forall a b. T14578.App f a -> T14578.App f b -> T14578.App f b</span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="plaintext"> forall (a :: *) (b :: *).</span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="plaintext"> T14578.App f a -> T14578.App f b -> T14578.App f b</span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext"> (GHC.Base.<*) ::</span>
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<pre style="margin: 0;">-<span id="LC65" class="line" lang="plaintext"> forall a b. T14578.App f a -> T14578.App f b -> T14578.App f a</span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext"> forall (a :: *) (b :: *).</span>
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<pre style="margin: 0;">+<span id="LC68" 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="LC69" class="line" lang="plaintext"> GHC.Base.pure</span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext"> = GHC.Prim.coerce</span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext"> @(a -> f a) @(a -> T14578.App f a) (GHC.Base.pure @f)</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d08443b3dd6a5343b6485f19a68eae158594446...b826244aaf61cf753449186761e0ad59c4f74eec#6c3a9e0a20f8145c45cc4c63b44430dd29ba7555"><strong>testsuite/tests/deriving/should_compile/T18914.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GeneralizedNewtypeDeriving #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18914</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">f</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"> <span class="n" style="color: #333;">m1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">f</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="n" style="color: #333;">m2</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">N</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkN</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>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">C</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d08443b3dd6a5343b6485f19a68eae158594446...b826244aaf61cf753449186761e0ad59c4f74eec#e7bc29da08da2be1b3bd264c751322dc3e8c1905"><strong>testsuite/tests/deriving/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -127,3 +127,4 @@ test('T17339', normal, compile,</td>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17880</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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128
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128
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18055</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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129
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129
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18321</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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130
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18914</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d08443b3dd6a5343b6485f19a68eae158594446...b826244aaf61cf753449186761e0ad59c4f74eec#5ced844c5529162410276a1236ca9b8e7186490c"><strong>testsuite/tests/rts/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="359" 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="359" 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">@@ -359,6 +359,7 @@ test('T14497', [omit_ways(['profasm']), multi_cpu_race], compile_and_run, ['-O']</td>
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359
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359
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14695</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ignore_stderr</span><span class="p">],</span> <span class="nv" style="color: #008080;">makefile_test</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T14695</span><span class="p">'])</span></span>
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360
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14702</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">ignore_stdout</span></span>
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361
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361
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="perl"> <span class="p">,</span> <span class="nv" style="color: #008080;">when</span><span class="p">(</span><span class="nv" style="color: #008080;">unregisterised</span><span class="p">(),</span> <span class="nv" style="color: #008080;">skip</span><span class="p">)</span></span>
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362
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="perl"> <span class="p">,</span> <span class="nv" style="color: #008080;">when</span><span class="p">(</span><span class="nv" style="color: #008080;">opsys</span><span class="p">('</span><span class="s1" style="color: #d14;">mingw32</span><span class="p">'),</span> <span class="nv" style="color: #008080;">fragile</span><span class="p">(</span><span class="mi" style="color: #099;">18953</span><span class="p">))</span></span>
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362
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363
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="perl"> <span class="p">,</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">'])</span></span>
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363
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="perl"> <span class="p">,</span> <span class="nv" style="color: #008080;">extra_run_opts</span><span class="p">('</span><span class="s1" style="color: #d14;">+RTS -A32m -N8 -T -RTS</span><span class="p">')</span></span>
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364
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="perl"> <span class="p">]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/6d08443b3dd6a5343b6485f19a68eae158594446...b826244aaf61cf753449186761e0ad59c4f74eec#46ddb8dda2edd2df4717a3285e83997fc812a347"><strong>utils/haddock</strong></a>
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<pre style="margin: 0;">-Subproject commit <span class="idiff left right">4d0498d503bd51b7d7626497580232685a2691a1</span></pre>
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<pre style="margin: 0;">+Subproject commit <span class="idiff left right">cbe3946394dbbdf73534bde7e32dd8f33daf31b4</span></pre>
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