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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/76d8cc744977d98f6a427b1816198709e2d2e856">76d8cc74</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-01T15:44:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Desugar quoted uses of DerivingVia and expression type signatures properly
The way that `GHC.HsToCore.Quote` desugared quoted `via` types (e.g.,
`deriving via forall a. [a] instance Eq a => Eq (List a)`) and
explicit type annotations in signatures (e.g.,
`f = id @a :: forall a. a -> a`) was completely wrong, as it did not
implement the scoping guidelines laid out in
`Note [Scoped type variables in bindings]`. This is easily fixed.
While I was in town, I did some minor cleanup of related Notes:
* `Note [Scoped type variables in bindings]` and
`Note [Scoped type variables in class and instance declarations]`
say very nearly the same thing. I decided to just consolidate the
two Notes into `Note [Scoped type variables in quotes]`.
* `Note [Don't quantify implicit type variables in quotes]` is
somewhat outdated, as it predates GHC 8.10, where the
`forall`-or-nothing rule requires kind variables to be explicitly
quantified in the presence of an explicit `forall`. As a result,
the running example in that Note doesn't even compile. I have
changed the example to something simpler that illustrates the
same point that the original Note was making.
Fixes #18388.
</pre>
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<h4>3 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#3c19c0be465f9a28d7b69f89c55648080fcc37eb">
compiler/GHC/HsToCore/Quote.hs
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<a href="#ed18eec1258e83635677fa96b3e7351f276a1631">
<span class="new-file">
+
testsuite/tests/th/T18388.hs
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<li class="file-stats">
<a href="#6f885f60b8c0fea6b94dd73a67d02212eedb4498">
testsuite/tests/th/all.T
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<h4>Changes:</h4>
<li id="3c19c0be465f9a28d7b69f89c55648080fcc37eb">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/76d8cc744977d98f6a427b1816198709e2d2e856#3c19c0be465f9a28d7b69f89c55648080fcc37eb"><strong>compiler/GHC/HsToCore/Quote.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="332" 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">@@ -332,7 +332,7 @@ repTopDs group@(HsGroup { hs_valds = valds</td>
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">notHandledL</span> <span class="n" style="color: #333;">loc</span> <span class="s" style="color: #d14;">"Haddock documentation"</span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"><span class="n" style="color: #333;">hsScopedTvBinders</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsValBinds</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC335" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoped type variables in <span class="idiff left right">binding</span>s]</span></span>
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoped type variables in <span class="idiff left right">quote</span>s]</span></span>
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<pre style="margin: 0;"> <span id="LC336" class="line" lang="haskell"><span class="n" style="color: #333;">hsScopedTvBinders</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;"> <span id="LC337" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">concatMap</span> <span class="n" style="color: #333;">get_scoped_tvs</span> <span class="n" style="color: #333;">sigs</span></span>
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<pre style="margin: 0;"> <span id="LC338" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="350" 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="350" 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">@@ -350,58 +350,60 @@ get_scoped_tvs (L _ signature)</td>
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">get_scoped_tvs_from_sig</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"> <span class="n" style="color: #333;">get_scoped_tvs_from_sig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"> <span class="n" style="color: #333;">get_scoped_tvs_from_sig</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Both implicit and explicit quantified variables</span></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need the implicit ones for f :: forall (a::k). blah</span></span>
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<pre style="margin: 0;">-<span id="LC358" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here 'k' scopes too</span></span>
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_vars</span></span>
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<pre style="margin: 0;">-<span id="LC360" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">explicit_vars</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;">splitLHsForAllTyInvis</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_vars</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">explicit_vars</span></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="n" style="color: #333;">get_scoped_tvs_from_sig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="n" style="color: #333;">get_scoped_tvs_from_sig</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Collect both implicit and explicit quantified variables, since</span></span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the types in instance heads, as well as `via` types in DerivingVia, can</span></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bring implicitly quantified type variables into scope, e.g.,</span></span>
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<pre style="margin: 0;">+<span id="LC359" 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="LC360" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- instance Foo [a] where</span></span>
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- m = n @a</span></span>
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<pre style="margin: 0;">+<span id="LC362" 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="LC363" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also Note [Scoped type variables in quotes]</span></span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_vars</span></span>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">explicit_vars</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;">splitLHsForAllTyInvis</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_vars</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">explicit_vars</span></span>
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<pre style="margin: 0;"> <span id="LC368" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Notes</span></span>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Scoped type variables in bindings]</span></span>
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<pre style="margin: 0;">-<span id="LC367" 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="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall a. a -> a</span></span>
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<pre style="margin: 0;">-<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x = x::a</span></span>
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here the 'forall a' brings 'a' into scope over the binding group.</span></span>
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<pre style="margin: 0;">-<span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To achieve this we</span></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Scoped type variables in quotes]</span></span>
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<pre style="margin: 0;">+<span id="LC372" 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="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Quoting declarations with scoped type variables requires some care. Consider:</span></span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a) Gensym a binding for 'a' at the same time as we do one for 'f'</span></span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> collecting the relevant binders with hsScopedTvBinders</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $([d| f :: forall a. a -> a</span></span>
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x = x::a</span></span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> |])</span></span>
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b) When processing the 'forall', don't gensym</span></span>
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, the `forall a` brings `a` into scope over the binding group. This has</span></span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ramifications when desugaring the quote, as we must ensure that that the</span></span>
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">desugared code binds `a` with `Language.Haskell.TH.newName` and refers to the</span></span>
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bound `a` type variable in the type signature and in the body of `f`. As a</span></span>
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">result, the call to `newName` must occur before any part of the declaration for</span></span>
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`f` is processed. To achieve this, we:</span></span>
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The relevant places are signposted with references to this Note</span></span>
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (a) Gensym a binding for `a` at the same time as we do one for `f`,</span></span>
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> collecting the relevant binders with the hsScopedTvBinders family of</span></span>
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> functions.</span></span>
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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Scoped type variables in class and instance declarations]</span></span>
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<pre style="margin: 0;">-<span id="LC382" 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="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Scoped type variables may occur in default methods and default</span></span>
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">signatures. We need to bring the type variables in 'foralls'</span></span>
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<pre style="margin: 0;">-<span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">into the scope of the method bindings.</span></span>
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (b) Use `addBinds` to bring these gensymmed bindings into scope over any</span></span>
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> part of the code where the type variables scope. In the `f` example,</span></span>
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> above, that means the type signature and the body of `f`.</span></span>
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<pre style="margin: 0;"> <span id="LC393" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class Foo a where</span></span>
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<pre style="margin: 0;">-<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo :: forall (b :: k). a -> Proxy b -> Proxy b</span></span>
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<pre style="margin: 0;">-<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo _ x = (x :: Proxy b)</span></span>
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (c) When processing the `forall`, /don't/ gensym the type variables. We have</span></span>
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> already brought the type variables into scope in part (b), after all, so</span></span>
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> gensymming them again would lead to shadowing. We use the rep_ty_sig</span></span>
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> family of functions for processing types without gensymming the type</span></span>
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> variables again.</span></span>
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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">We want to ensure that the 'b' in the type signature and the default</span></span></span>
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">implementation are the same, so we do the following</span>:</span></span>
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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> (d) Finally, we use wrapGenSyms to generate the Core for these scoped type</span></span></span>
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<pre style="margin: 0;">+<span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> variables</span>:</span></span>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a) Before desugaring the signature and binding of 'foo', use</span></span>
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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> get_scoped_tvs to collect type variables in 'forall' and</span></span>
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<pre style="margin: 0;">-<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> create symbols for them.</span></span>
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<pre style="margin: 0;">-<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b) Use 'addBinds' to bring these symbols into the scope of the type</span></span>
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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> signatures and bindings.</span></span>
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<pre style="margin: 0;">-<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> c) Use these symbols to generate Core for the class/instance declaration.</span></span>
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newName "a" >>= \a -></span></span>
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ... -- process the type signature and body of `f`</span></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that when desugaring the signatures, we lookup the type variables</span></span>
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from the scope rather than recreate symbols for them. See more details</span></span>
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in "rep_ty_sig" and in Trac#14885.</span></span>
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The relevant places are signposted with references to this Note.</span></span>
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Binders and occurrences]</span></span>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -429,16 +431,16 @@ Note [Don't quantify implicit type variables in quotes]</td>
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<pre style="margin: 0;"> <span id="LC431" 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="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If you're not careful, it's surprisingly easy to take this quoted declaration:</span></span>
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [d| id<span class="idiff left right">Proxy :: forall proxy (b :: k). proxy b -> proxy b</span></span></span>
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<pre style="margin: 0;">-<span id="LC433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> id<span class="idiff left right">Proxy</span> x = x</span></span>
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [d| id<span class="idiff left right"> :: a -> a</span></span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> id x = x</span></span>
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<pre style="margin: 0;"> <span id="LC436" 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="LC437" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and have Template Haskell turn it into this:</span></span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> id<span class="idiff left right">Proxy :: forall k proxy (b :: k). proxy b -> proxy b</span></span></span>
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<pre style="margin: 0;">-<span id="LC439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> id<span class="idiff left right">Proxy</span> x = x</span></span>
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<pre style="margin: 0;">+<span id="LC440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> id<span class="idiff left right"> :: forall a. a -> a</span></span></span>
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<pre style="margin: 0;">+<span id="LC441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> id x = x</span></span>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Notice that we explicitly quantified the variable `<span class="idiff left right">k</span>`! The latter declaration</span></span>
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<pre style="margin: 0;">+<span id="LC443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Notice that we explicitly quantified the variable `<span class="idiff left right">a</span>`! The latter declaration</span></span>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">isn't what the user wrote in the first place.</span></span>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Usually, the culprit behind these bugs is taking implicitly quantified type</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">@@ -474,8 +476,8 @@ repTyClD (L loc (ClassDecl { tcdCtxt = cxt, tcdLName = cls,</td>
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<pre style="margin: 0;"> <span id="LC476" 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;">cls1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupLOcc</span> <span class="n" style="color: #333;">cls</span> <span class="c1" style="color: #998; font-style: italic;">-- See note [Binders and occurrences]</span></span>
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<pre style="margin: 0;"> <span id="LC477" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dec</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addQTyVarBinds</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC478" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cxt1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLContext</span> <span class="n" style="color: #333;">cxt</span></span>
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<pre style="margin: 0;">-<span id="LC477" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoped type variables in <span class="idiff left right">class and instance declaration</span>s]</span></span>
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<pre style="margin: 0;">-<span id="LC478" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ss</span><span class="p">,</span> <span class="n" style="color: #333;">sigs_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rep_sigs_binds</span> <span class="n" style="color: #333;">sigs</span> <span class="n" style="color: #333;">meth_binds</span></span>
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<pre style="margin: 0;">+<span id="LC479" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoped type variables in <span class="idiff left right">quote</span>s]</span></span>
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<pre style="margin: 0;">+<span id="LC480" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ss</span><span class="p">,</span> <span class="n" style="color: #333;">sigs_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rep_<span class="idiff left right">meth_</span>sigs_binds</span> <span class="n" style="color: #333;">sigs</span> <span class="n" style="color: #333;">meth_binds</span></span>
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<pre style="margin: 0;"> <span id="LC481" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">fds1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLFunDeps</span> <span class="n" style="color: #333;">fds</span></span>
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482
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<pre style="margin: 0;"> <span id="LC482" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ats1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repFamilyDecls</span> <span class="n" style="color: #333;">ats</span></span>
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483
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<pre style="margin: 0;"> <span id="LC483" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">atds1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">repAssocTyFamDefaultD</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span><span class="p">)</span> <span class="n" style="color: #333;">atds</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">@@ -650,8 +652,8 @@ repClsInstD (ClsInstDecl { cid_poly_ty = ty, cid_binds = binds</td>
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650
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652
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<pre style="margin: 0;"> <span id="LC652" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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651
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653
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<pre style="margin: 0;"> <span id="LC653" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cxt1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLContext</span> <span class="n" style="color: #333;">cxt</span></span>
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654
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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">inst_ty1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLTy</span> <span class="n" style="color: #333;">inst_ty</span></span>
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<pre style="margin: 0;">-<span id="LC653" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoped type variables in <span class="idiff left right">class and instance declaration</span>s]</span></span>
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<pre style="margin: 0;">-<span id="LC654" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ss</span><span class="p">,</span> <span class="n" style="color: #333;">sigs_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rep_sigs_binds</span> <span class="n" style="color: #333;">sigs</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoped type variables in <span class="idiff left right">quote</span>s]</span></span>
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ss</span><span class="p">,</span> <span class="n" style="color: #333;">sigs_binds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rep_<span class="idiff left right">meth_</span>sigs_binds</span> <span class="n" style="color: #333;">sigs</span> <span class="n" style="color: #333;">binds</span></span>
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657
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<pre style="margin: 0;"> <span id="LC657" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ats1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">repTyFamInstD</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span><span class="p">)</span> <span class="n" style="color: #333;">ats</span></span>
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658
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<pre style="margin: 0;"> <span id="LC658" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">adts1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">repDataFamInstD</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span><span class="p">)</span> <span class="n" style="color: #333;">adts</span></span>
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659
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">decls1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreListM</span> <span class="n" style="color: #333;">decTyConName</span> <span class="p">(</span><span class="n" style="color: #333;">ats1</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">adts1</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">sigs_binds</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">@@ -664,9 +666,9 @@ repClsInstD (ClsInstDecl { cid_poly_ty = ty, cid_binds = binds</td>
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666
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<pre style="margin: 0;"> <span id="LC666" class="line" lang="haskell"><span class="n" style="color: #333;">repStandaloneDerivD</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LDerivDecl</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;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Dec</span><span class="p">))</span></span>
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667
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<pre style="margin: 0;"> <span id="LC667" class="line" lang="haskell"><span class="n" style="color: #333;">repStandaloneDerivD</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;">DerivDecl</span> <span class="p">{</span> <span class="n" style="color: #333;">deriv_strategy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">strat</span></span>
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<pre style="margin: 0;"> <span id="LC668" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">deriv_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span> <span class="p">}))</span></span>
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<pre style="margin: 0;">-<span id="LC667" 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;">dec</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addSimpleTyVarBinds</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">dec</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repDerivStrategy</span> <span class="n" style="color: #333;">strat</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">strat'</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC670" class="line" lang="haskell"> <span class="n" style="color: #333;">addSimpleTyVarBinds</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC671" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cxt'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLContext</span> <span class="n" style="color: #333;">cxt</span></span>
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<pre style="margin: 0;">-<span id="LC669" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">strat'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repDerivStrategy</span> <span class="n" style="color: #333;">strat</span></span>
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<pre style="margin: 0;"> <span id="LC672" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">inst_ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLTy</span> <span class="n" style="color: #333;">inst_ty</span></span>
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<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">repDeriv</span> <span class="n" style="color: #333;">strat'</span> <span class="n" style="color: #333;">cxt'</span> <span class="n" style="color: #333;">inst_ty'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC674" 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;">loc</span><span class="p">,</span> <span class="n" style="color: #333;">dec</span><span class="p">)</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">@@ -943,23 +945,23 @@ repDerivClause :: LHsDerivingClause GhcRn</td>
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<pre style="margin: 0;"> <span id="LC945" class="line" lang="haskell"><span class="n" style="color: #333;">repDerivClause</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsDerivingClause</span></span>
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<pre style="margin: 0;"> <span id="LC946" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">deriv_clause_strategy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dcs</span></span>
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<pre style="margin: 0;"> <span id="LC947" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">deriv_clause_tys</span> <span class="o" style="font-weight: 600;">=</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;">dct</span> <span class="p">}))</span></span>
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">do</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dcs'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">repDerivStrategy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">dcs</span></span></span>
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"> <span class="idiff left right"> </span> <span class="kt" style="color: #458; font-weight: 600;">MkC</span> <span class="n" style="color: #333;">dct'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repListM</span> <span class="n" style="color: #333;">typeTyConName</span> <span class="p">(</span><span class="n" style="color: #333;">rep_deriv_ty</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">hsSigType</span><span class="p">)</span> <span class="n" style="color: #333;">dct</span></span>
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<pre style="margin: 0;">+<span id="LC948" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">repDerivStrategy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dcs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MkC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dcs'</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span></span>
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<pre style="margin: 0;">+<span id="LC949" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left right">do</span></span> <span class="kt" style="color: #458; font-weight: 600;">MkC</span> <span class="n" style="color: #333;">dct'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repListM</span> <span class="n" style="color: #333;">typeTyConName</span> <span class="p">(</span><span class="n" style="color: #333;">rep_deriv_ty</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">hsSigType</span><span class="p">)</span> <span class="n" style="color: #333;">dct</span></span>
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<pre style="margin: 0;"> <span id="LC950" class="line" lang="haskell"> <span class="n" style="color: #333;">rep2</span> <span class="n" style="color: #333;">derivClauseName</span> <span class="p">[</span><span class="n" style="color: #333;">dcs'</span><span class="p">,</span><span class="n" style="color: #333;">dct'</span><span class="p">]</span></span>
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951
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<pre style="margin: 0;"> <span id="LC951" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC952" class="line" lang="haskell"> <span class="n" style="color: #333;">rep_deriv_ty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC953" class="line" lang="haskell"> <span class="n" style="color: #333;">rep_deriv_ty</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">repLTy</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC954" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC953" class="line" lang="haskell"><span class="n" style="color: #333;">rep_sigs_binds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LSig</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsBinds</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">-<span id="LC954" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">GenSymBind</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Dec</span><span class="p">)])</span></span>
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"><span class="n" style="color: #333;">rep_<span class="idiff left right">meth_</span>sigs_binds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LSig</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsBinds</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">GenSymBind</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Dec</span><span class="p">)])</span></span>
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<pre style="margin: 0;"> <span id="LC957" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Represent signatures and methods in class/instance declarations.</span></span>
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<pre style="margin: 0;">-<span id="LC956" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoped type variables in <span class="idiff left right">class and instance declaration</span>s]</span></span>
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoped type variables in <span class="idiff left right">quote</span>s]</span></span>
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<pre style="margin: 0;"> <span id="LC959" 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="LC960" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Why not use 'repBinds': we have already created symbols for methods in</span></span>
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<pre style="margin: 0;"> <span id="LC961" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'repTopDs' via 'hsGroupBinders'. However in 'repBinds', we recreate</span></span>
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- these fun_id via 'collectHsValBinders decs', which would lead to the</span></span>
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<pre style="margin: 0;"> <span id="LC963" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- instance declarations failing in TH.</span></span>
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<pre style="margin: 0;">-<span id="LC962" class="line" lang="haskell"><span class="n" style="color: #333;">rep_sigs_binds</span> <span class="n" style="color: #333;">sigs</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="haskell"><span class="n" style="color: #333;">rep_<span class="idiff left right">meth_</span>sigs_binds</span> <span class="n" style="color: #333;">sigs</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;"> <span id="LC965" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">concatMap</span> <span class="n" style="color: #333;">get_scoped_tvs</span> <span class="n" style="color: #333;">sigs</span></span>
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<pre style="margin: 0;"> <span id="LC966" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ss</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkGenSyms</span> <span class="n" style="color: #333;">tvs</span></span>
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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;">sigs1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addBinds</span> <span class="n" style="color: #333;">ss</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">rep_sigs</span> <span class="n" style="color: #333;">sigs</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -993,30 +995,47 @@ rep_sig (L _ (SCCFunSig {})) = notHandled "SCC pragmas" empty</td>
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<pre style="margin: 0;"> <span id="LC995" class="line" lang="haskell"><span class="n" style="color: #333;">rep_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;">CompleteMatchSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">_st</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">mty</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC996" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rep_complete_sig</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">mty</span> <span class="n" style="color: #333;">loc</span></span>
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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="c1" style="color: #998; font-style: italic;">-- Desugar the explicit type variable binders in an 'LHsSigType', making</span></span>
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- sure not to gensym them.</span></span>
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoped type variables in quotes]</span></span>
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<pre style="margin: 0;">+<span id="LC1001" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and Note [Don't quantify implicit type variables in quotes]</span></span>
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"><span class="n" style="color: #333;">rep_ty_sig_tvs</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="kt" style="color: #458; font-weight: 600;">Specificity</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span></span>
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1003
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<pre style="margin: 0;">+<span id="LC1003" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TyVarBndrSpec</span><span class="p">])</span></span>
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1004
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"><span class="n" style="color: #333;">rep_ty_sig_tvs</span> <span class="n" style="color: #333;">explicit_tvs</span></span>
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<pre style="margin: 0;">+<span id="LC1005" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rep_in_scope_tv</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupBinder</span> <span class="p">(</span><span class="n" style="color: #333;">hsLTyVarName</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">repTyVarBndrWithKind</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">name</span> <span class="p">}</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"> <span class="n" style="color: #333;">repListM</span> <span class="n" style="color: #333;">tyVarBndrSpecTyConName</span> <span class="n" style="color: #333;">rep_in_scope_tv</span></span>
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"> <span class="n" style="color: #333;">explicit_tvs</span></span>
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<pre style="margin: 0;">+<span id="LC1009" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: Don't pass any implicit type variables to repList above</span></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Don't quantify implicit type variables in quotes]</span></span>
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"></span>
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1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Desugar a top-level type signature. Unlike 'repHsSigType', this</span></span>
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1013
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<pre style="margin: 0;">+<span id="LC1013" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- deliberately avoids gensymming the type variables.</span></span>
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1014
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoped type variables in quotes]</span></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and Note [Don't quantify implicit type variables in quotes]</span></span>
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"><span class="n" style="color: #333;">rep_ty_sig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Dec</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC998" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Don't create the implicit and explicit variables when desugaring signatures,</span></span>
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<pre style="margin: 0;">-<span id="LC999" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- see Note [Scoped type variables in class and instance declarations].</span></span>
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<pre style="margin: 0;">-<span id="LC1000" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and Note [Don't quantify implicit type variables in quotes]</span></span>
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1001
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1018
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<pre style="margin: 0;"> <span id="LC1018" class="line" lang="haskell"><span class="n" style="color: #333;">rep_ty_sig</span> <span class="n" style="color: #333;">mk_sig</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">sig_ty</span> <span class="n" style="color: #333;">nm</span></span>
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1002
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<pre style="margin: 0;">-<span id="LC1002" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig_ty</span></span>
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1003
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<pre style="margin: 0;">-<span id="LC1003" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">explicit_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsSigmaTyInvis</span> <span class="n" style="color: #333;">hs_ty</span></span>
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1004
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1019
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<pre style="margin: 0;"> <span id="LC1019" 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;">nm1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupLOcc</span> <span class="n" style="color: #333;">nm</span></span>
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1005
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<pre style="margin: 0;">-<span id="LC1005" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rep_in_scope_tv</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupBinder</span> <span class="p">(</span><span class="n" style="color: #333;">hsLTyVarName</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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1006
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<pre style="margin: 0;">-<span id="LC1006" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">repTyVarBndrWithKind</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">name</span> <span class="p">}</span></span>
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1007
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<pre style="margin: 0;">-<span id="LC1007" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">th_explicit_tvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repListM</span> <span class="n" style="color: #333;">tyVarBndrSpecTyConName</span> <span class="n" style="color: #333;">rep_in_scope_tv</span></span>
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1008
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<pre style="margin: 0;">-<span id="LC1008" class="line" lang="haskell"> <span class="n" style="color: #333;">explicit_tvs</span></span>
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1009
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<pre style="margin: 0;">-<span id="LC1009" class="line" lang="haskell"></span>
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1010
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<pre style="margin: 0;">-<span id="LC1010" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: Don't pass any implicit type variables to repList above</span></span>
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1011
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<pre style="margin: 0;">-<span id="LC1011" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Don't quantify implicit type variables in quotes]</span></span>
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ty1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rep_ty_sig'</span> <span class="n" style="color: #333;">sig_ty</span></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repProto</span> <span class="n" style="color: #333;">mk_sig</span> <span class="n" style="color: #333;">nm1</span> <span class="n" style="color: #333;">ty1</span></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" 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;">loc</span><span class="p">,</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span> <span class="p">}</span></span>
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1012
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1023
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<pre style="margin: 0;"> <span id="LC1023" class="line" lang="haskell"></span>
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1024
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<pre style="margin: 0;">+<span id="LC1024" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Desugar an 'LHsSigType', making sure not to gensym the type variables at</span></span>
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1025
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<pre style="margin: 0;">+<span id="LC1025" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the front of the type signature.</span></span>
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1026
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<pre style="margin: 0;">+<span id="LC1026" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoped type variables in quotes]</span></span>
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1027
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<pre style="margin: 0;">+<span id="LC1027" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and Note [Don't quantify implicit type variables in quotes]</span></span>
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1028
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"><span class="n" style="color: #333;">rep_ty_sig'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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1029
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<pre style="margin: 0;">+<span id="LC1029" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">))</span></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"><span class="n" style="color: #333;">rep_ty_sig'</span> <span class="n" style="color: #333;">sig_ty</span></span>
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1031
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<pre style="margin: 0;">+<span id="LC1031" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig_ty</span></span>
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1032
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">explicit_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsSigmaTyInvis</span> <span class="n" style="color: #333;">hs_ty</span></span>
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1033
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<pre style="margin: 0;">+<span id="LC1033" 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;">th_explicit_tvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rep_ty_sig_tvs</span> <span class="n" style="color: #333;">explicit_tvs</span></span>
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1013
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">th_ctxt</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLContext</span> <span class="n" style="color: #333;">ctxt</span></span>
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1014
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">th_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLTy</span> <span class="n" style="color: #333;">ty</span></span>
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1015
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<pre style="margin: 0;">-<span id="LC1015" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ty1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">explicit_tvs</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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1016
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<pre style="margin: 0;">-<span id="LC1016" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">th_ty</span></span>
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1017
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<pre style="margin: 0;">-<span id="LC1017" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">repTForall</span> <span class="n" style="color: #333;">th_explicit_tvs</span> <span class="n" style="color: #333;">th_ctxt</span> <span class="n" style="color: #333;">th_ty</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repProto</span> <span class="n" style="color: #333;">mk_sig</span> <span class="n" style="color: #333;">nm1</span> <span class="n" style="color: #333;">ty1</span></span>
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1019
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<pre style="margin: 0;">-<span id="LC1019" 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;">loc</span><span class="p">,</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span> <span class="p">}</span></span>
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1036
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<pre style="margin: 0;">+<span id="LC1036" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">explicit_tvs</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">th_ty</span></span>
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1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">repTForall</span> <span class="n" style="color: #333;">th_explicit_tvs</span> <span class="n" style="color: #333;">th_ctxt</span> <span class="n" style="color: #333;">th_ty</span> <span class="p">}</span></span>
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1020
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"></span>
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1021
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1040
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="haskell"><span class="n" style="color: #333;">rep_patsyn_ty_sig</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;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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1022
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Dec</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">@@ -1024,19 +1043,14 @@ rep_patsyn_ty_sig :: SrcSpan -> LHsSigType GhcRn -> Located Name</td>
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1024
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- see Note [Pattern synonym type signatures and Template Haskell] in "GHC.ThToHs"</span></span>
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1025
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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;">--</span></span>
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1026
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1045
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<pre style="margin: 0;"> <span id="LC1045" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Don't create the implicit and explicit variables when desugaring signatures,</span></span>
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1027
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<pre style="margin: 0;">-<span id="LC1027" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- see Note [Scoped type variables in <span class="idiff left right">class and instance declaration</span>s]</span></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;">-- see Note [Scoped type variables in <span class="idiff left right">quote</span>s]</span></span>
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1028
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1047
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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and Note [Don't quantify implicit type variables in quotes]</span></span>
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1029
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1048
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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="haskell"><span class="n" style="color: #333;">rep_patsyn_ty_sig</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">sig_ty</span> <span class="n" style="color: #333;">nm</span></span>
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1030
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1049
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<pre style="margin: 0;"> <span id="LC1049" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig_ty</span></span>
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1031
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1050
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<pre style="margin: 0;"> <span id="LC1050" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">univs</span><span class="p">,</span> <span class="n" style="color: #333;">reqs</span><span class="p">,</span> <span class="n" style="color: #333;">exis</span><span class="p">,</span> <span class="n" style="color: #333;">provs</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsPatSynTy</span> <span class="n" style="color: #333;">hs_ty</span></span>
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1032
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1051
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<pre style="margin: 0;"> <span id="LC1051" 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;">nm1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupLOcc</span> <span class="n" style="color: #333;">nm</span></span>
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1033
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<pre style="margin: 0;">-<span id="LC1033" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rep_in_scope_tv</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupBinder</span> <span class="p">(</span><span class="n" style="color: #333;">hsLTyVarName</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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1034
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<pre style="margin: 0;">-<span id="LC1034" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">repTyVarBndrWithKind</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">name</span> <span class="p">}</span></span>
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1035
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<pre style="margin: 0;">-<span id="LC1035" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">th_univs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repListM</span> <span class="n" style="color: #333;">tyVarBndrSpecTyConName</span> <span class="n" style="color: #333;">rep_in_scope_tv</span> <span class="n" style="color: #333;">univs</span></span>
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1036
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<pre style="margin: 0;">-<span id="LC1036" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">th_exis</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repListM</span> <span class="n" style="color: #333;">tyVarBndrSpecTyConName</span> <span class="n" style="color: #333;">rep_in_scope_tv</span> <span class="n" style="color: #333;">exis</span></span>
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1037
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<pre style="margin: 0;">-<span id="LC1037" class="line" lang="haskell"></span>
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1038
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<pre style="margin: 0;">-<span id="LC1038" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: Don't pass any implicit type variables to repList above</span></span>
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1039
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<pre style="margin: 0;">-<span id="LC1039" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Don't quantify implicit type variables in quotes]</span></span>
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1052
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<pre style="margin: 0;">+<span id="LC1052" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">th_univs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rep_ty_sig_tvs</span> <span class="n" style="color: #333;">univs</span></span>
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1053
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">th_exis</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rep_ty_sig_tvs</span> <span class="n" style="color: #333;">exis</span></span>
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1040
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1054
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<pre style="margin: 0;"> <span id="LC1054" class="line" lang="haskell"></span>
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1055
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<pre style="margin: 0;"> <span id="LC1055" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">th_reqs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLContext</span> <span class="n" style="color: #333;">reqs</span></span>
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1042
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1056
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<pre style="margin: 0;"> <span id="LC1056" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">th_provs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLContext</span> <span class="n" style="color: #333;">provs</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1253" 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="1267" 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">@@ -1253,10 +1267,6 @@ repHsSigType (HsIB { hsib_ext = implicit_tvs</td>
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1253
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1267
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<pre style="margin: 0;"> <span id="LC1267" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">th_ty</span></span>
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1254
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1268
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<pre style="margin: 0;"> <span id="LC1268" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">repTForall</span> <span class="n" style="color: #333;">th_explicit_tvs</span> <span class="n" style="color: #333;">th_ctxt</span> <span class="n" style="color: #333;">th_ty</span> <span class="p">}</span></span>
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1255
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1269
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<pre style="margin: 0;"> <span id="LC1269" class="line" lang="haskell"></span>
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1256
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<pre style="margin: 0;">-<span id="LC1256" class="line" lang="haskell"><span class="n" style="color: #333;">repHsSigWcType</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;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">))</span></span>
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1257
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<pre style="margin: 0;">-<span id="LC1257" class="line" lang="haskell"><span class="n" style="color: #333;">repHsSigWcType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="p">{</span> <span class="n" style="color: #333;">hswc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig1</span> <span class="p">})</span></span>
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1258
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<pre style="margin: 0;">-<span id="LC1258" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">repHsSigType</span> <span class="n" style="color: #333;">sig1</span></span>
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1259
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<pre style="margin: 0;">-<span id="LC1259" class="line" lang="haskell"></span>
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1260
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1270
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<pre style="margin: 0;"> <span id="LC1270" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- yield the representation of a list of types</span></span>
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1261
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1271
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<pre style="margin: 0;"> <span id="LC1271" class="line" lang="haskell"><span class="n" style="color: #333;">repLTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)]</span></span>
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1262
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1272
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<pre style="margin: 0;"> <span id="LC1272" class="line" lang="haskell"><span class="n" style="color: #333;">repLTys</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">repLTy</span> <span class="n" style="color: #333;">tys</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1528" 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="1538" 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">@@ -1528,10 +1538,13 @@ repE (RecordUpd { rupd_expr = e, rupd_flds = flds })</td>
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1528
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1538
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<pre style="margin: 0;"> <span id="LC1538" class="line" lang="haskell"> <span class="n" style="color: #333;">fs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repUpdFields</span> <span class="n" style="color: #333;">flds</span><span class="p">;</span></span>
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1529
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1539
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<pre style="margin: 0;"> <span id="LC1539" class="line" lang="haskell"> <span class="n" style="color: #333;">repRecUpd</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">fs</span> <span class="p">}</span></span>
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1530
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1540
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<pre style="margin: 0;"> <span id="LC1540" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1531" class="line" lang="haskell"><span class="n" style="color: #333;">repE</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprWithTySig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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1532
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<pre style="margin: 0;">-<span id="LC1532" 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;">e1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLE</span> <span class="n" style="color: #333;">e</span></span>
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1533
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<pre style="margin: 0;">-<span id="LC1533" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">t1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repHsSigWcType</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell"><span class="n" style="color: #333;">repE</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprWithTySig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">wc_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addSimpleTyVarBinds</span> <span class="p">(</span><span class="n" style="color: #333;">get_scoped_tvs_from_sig</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">e1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLE</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">t1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rep_ty_sig'</span> <span class="n" style="color: #333;">sig_ty</span></span>
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1545
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<pre style="margin: 0;"> <span id="LC1545" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">repSigExp</span> <span class="n" style="color: #333;">e1</span> <span class="n" style="color: #333;">t1</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dropWildCards</span> <span class="n" style="color: #333;">wc_ty</span></span>
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1548
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<pre style="margin: 0;"> <span id="LC1548" class="line" lang="haskell"></span>
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1549
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<pre style="margin: 0;"> <span id="LC1549" class="line" lang="haskell"><span class="n" style="color: #333;">repE</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ArithSeq</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">aseq</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC1550" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">aseq</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1734,7 +1747,7 @@ repBinds (HsValBinds _ decs)</td>
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<pre style="margin: 0;"> <span id="LC1747" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the binding group, because we are talking Names</span></span>
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<pre style="margin: 0;"> <span id="LC1748" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here, so we can safely treat it as a mutually</span></span>
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<pre style="margin: 0;"> <span id="LC1749" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- recursive group</span></span>
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<pre style="margin: 0;">-<span id="LC1737" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For hsScopedTvBinders see Note [Scoped type variables in <span class="idiff left right">binding</span>s]</span></span>
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<pre style="margin: 0;">+<span id="LC1750" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For hsScopedTvBinders see Note [Scoped type variables in <span class="idiff left right">quote</span>s]</span></span>
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<pre style="margin: 0;"> <span id="LC1751" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ss</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkGenSyms</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC1752" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">prs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addBinds</span> <span class="n" style="color: #333;">ss</span> <span class="p">(</span><span class="n" style="color: #333;">rep_val_binds</span> <span class="n" style="color: #333;">decs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1753" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">core_list</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreListM</span> <span class="n" style="color: #333;">decTyConName</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">@@ -2427,18 +2440,21 @@ repInst (MkC o) (MkC cxt) (MkC ty) (MkC ds) = rep2 instanceWithOverlapDName</td>
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<pre style="margin: 0;"> <span id="LC2440" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">o</span><span class="p">,</span> <span class="n" style="color: #333;">cxt</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">ds</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2441" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2442" class="line" lang="haskell"><span class="n" style="color: #333;">repDerivStrategy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LDerivStrategy</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span></span>
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2430
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<pre style="margin: 0;">-<span id="LC2430" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">DerivStrategy</span><span class="p">)))</span></span>
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2431
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<pre style="margin: 0;">-<span id="LC2431" class="line" lang="haskell"><span class="n" style="color: #333;">repDerivStrategy</span> <span class="n" style="color: #333;">mds</span> <span class="o" style="font-weight: 600;">=</span></span>
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2443
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<pre style="margin: 0;">+<span id="LC2443" 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;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">DerivStrategy</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="n" style="color: #333;">a</span><span class="p">)))</span></span>
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2444
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<pre style="margin: 0;">+<span id="LC2444" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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2445
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<pre style="margin: 0;">+<span id="LC2445" class="line" lang="haskell"><span class="n" style="color: #333;">repDerivStrategy</span> <span class="n" style="color: #333;">mds</span> <span class="n" style="color: #333;">thing_inside</span> <span class="o" style="font-weight: 600;">=</span></span>
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2432
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2446
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<pre style="margin: 0;"> <span id="LC2446" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mds</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2433
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<td class="diff-line-num new_line old" data-linenumber="2447" 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="LC2433" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">nothing</span></span>
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2447
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<pre style="margin: 0;">+<span id="LC2447" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">thing_inside</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;">nothing</span></span>
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2434
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2448
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<pre style="margin: 0;"> <span id="LC2448" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ds</span> <span class="o" style="font-weight: 600;">-></span></span>
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2435
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2449
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<pre style="margin: 0;"> <span id="LC2449" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">ds</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2436
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<pre style="margin: 0;">-<span id="LC2436" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StockStrategy</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">just</span> <span class="o" style="font-weight: 600;">=<<</span> <span class="n" style="color: #333;">repStockStrategy</span></span>
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2437
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<pre style="margin: 0;">-<span id="LC2437" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AnyclassStrategy</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">just</span> <span class="o" style="font-weight: 600;">=<<</span> <span class="n" style="color: #333;">repAnyclassStrategy</span></span>
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2438
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<pre style="margin: 0;">-<span id="LC2438" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NewtypeStrategy</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">just</span> <span class="o" style="font-weight: 600;">=<<</span> <span class="n" style="color: #333;">repNewtypeStrategy</span></span>
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2439
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<pre style="margin: 0;">-<span id="LC2439" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ViaStrategy</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLTy</span> <span class="p">(</span><span class="n" style="color: #333;">hsSigType</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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2450
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<pre style="margin: 0;">+<span id="LC2450" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StockStrategy</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">thing_inside</span> <span class="o" style="font-weight: 600;">=<<</span> <span class="n" style="color: #333;">just</span> <span class="o" style="font-weight: 600;">=<<</span> <span class="n" style="color: #333;">repStockStrategy</span></span>
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2451
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<pre style="margin: 0;">+<span id="LC2451" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AnyclassStrategy</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">thing_inside</span> <span class="o" style="font-weight: 600;">=<<</span> <span class="n" style="color: #333;">just</span> <span class="o" style="font-weight: 600;">=<<</span> <span class="n" style="color: #333;">repAnyclassStrategy</span></span>
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2452
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<pre style="margin: 0;">+<span id="LC2452" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NewtypeStrategy</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">thing_inside</span> <span class="o" style="font-weight: 600;">=<<</span> <span class="n" style="color: #333;">just</span> <span class="o" style="font-weight: 600;">=<<</span> <span class="n" style="color: #333;">repNewtypeStrategy</span></span>
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2453
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<pre style="margin: 0;">+<span id="LC2453" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ViaStrategy</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addSimpleTyVarBinds</span> <span class="p">(</span><span class="n" style="color: #333;">get_scoped_tvs_from_sig</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2454
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<pre style="margin: 0;">+<span id="LC2454" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rep_ty_sig'</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC2455" class="line" lang="haskell"> <span class="n" style="color: #333;">via_strat</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repViaStrategy</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;">-<span id="LC2441" class="line" lang="haskell"> <span class="n" style="color: #333;">just</span> <span class="n" style="color: #333;">via_strat</span></span>
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<pre style="margin: 0;">+<span id="LC2456" class="line" lang="haskell"> <span class="n" style="color: #333;">m_via_strat</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">just</span> <span class="n" style="color: #333;">via_strat</span></span>
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<pre style="margin: 0;">+<span id="LC2457" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">m_via_strat</span></span>
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<pre style="margin: 0;"> <span id="LC2458" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2443
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<pre style="margin: 0;"> <span id="LC2459" class="line" lang="haskell"> <span class="n" style="color: #333;">nothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coreNothingM</span> <span class="n" style="color: #333;">derivStrategyTyConName</span></span>
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2460
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<pre style="margin: 0;"> <span id="LC2460" class="line" lang="haskell"> <span class="n" style="color: #333;">just</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coreJustM</span> <span class="n" style="color: #333;">derivStrategyTyConName</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/76d8cc744977d98f6a427b1816198709e2d2e856#ed18eec1258e83635677fa96b3e7351f276a1631"><strong>testsuite/tests/th/T18388.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 DerivingVia #-}</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 FlexibleInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MultiParamTypeClasses #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE StandaloneDeriving #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TemplateHaskell #-}</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeApplications #-}</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18388</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" 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;">x</span> <span class="n" style="color: #333;">y</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Tagged</span> <span class="n" style="color: #333;">x</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;">MkTagged</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tagged</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="o" style="font-weight: 600;">$</span><span class="p">(</span><span class="o" style="font-weight: 600;">[</span><span class="n" style="color: #333;">d</span><span class="o" style="font-weight: 600;">|</span> newtype Id1 a = MkId1 a</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> deriving (C x) via forall x. Tagged x a</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> newtype Id2 a = MkId2 a</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> deriving (C x) via Tagged x a</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|]</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">List1</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;">MkList1</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">List2</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;">MkList2</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="o" style="font-weight: 600;">$</span><span class="p">(</span><span class="o" style="font-weight: 600;">[</span><span class="n" style="color: #333;">d</span><span class="o" style="font-weight: 600;">|</span> deriving via forall a. [a] instance Eq a => Eq (List1 a) <span class="o" style="font-weight: 600;">|]</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="o" style="font-weight: 600;">$</span><span class="p">(</span><span class="o" style="font-weight: 600;">[</span><span class="n" style="color: #333;">d</span><span class="o" style="font-weight: 600;">|</span> deriving via [a] instance Eq a => Eq (List2 a) <span class="o" style="font-weight: 600;">|]</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="o" style="font-weight: 600;">$</span><span class="p">(</span><span class="o" style="font-weight: 600;">[</span><span class="n" style="color: #333;">d</span><span class="o" style="font-weight: 600;">|</span> f = id @a :: forall a. a -> a <span class="o" style="font-weight: 600;">|]</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/76d8cc744977d98f6a427b1816198709e2d2e856#6f885f60b8c0fea6b94dd73a67d02212eedb4498"><strong>testsuite/tests/th/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">@@ -510,3 +510,4 @@ test('TH_StringLift', normal, compile, [''])</td>
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510
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">TH_BytesShowEqOrd</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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511
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511
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18121</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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512
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512
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18123</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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513
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18388</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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