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<h3>
Ryan Scott pushed to branch wip/always-use-rnImplicitBndrs
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/285f281743865ea1657cd734527c7c3fc64bd0f7">285f2817</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-27T08:16:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always use rnImplicitBndrs to bring implicit tyvars into scope
This implements a first step towards #16762 by changing the renamer
to always use `rnImplicitBndrs` to bring implicitly bound type
variables into scope. The main change is in `rnFamInstEqn` and
`bindHsQTyVars`, which previously used _ad hoc_ methods of binding
their implicit tyvars.
There are a number of knock-on consequences:
* One of the reasons that `rnFamInstEqn` used an _ad hoc_ binding
mechanism was to give more precise source locations in
`-Wunused-type-patterns` warnings. (See
https://gitlab.haskell.org/ghc/ghc/issues/16762#note_273343 for an
example of this.) However, these warnings are actually a little
_too_ precise, since implicitly bound type variables don't have
exact binding sites like explicitly bound type variables do.
A similar problem existed for
"`Different names for the same type variable`" errors involving
implicit tyvars bound by `bindHsQTyVars`.
Therefore, we simply accept the less precise (but more accurate)
source locations from `rnImplicitBndrs` in `rnFamInstEqn` and
`bindHsQTyVars`. See
`Note [Source locations for implicitly bound type variables]` in
`GHC.Rename.HsType` for the full story.
* In order for `rnImplicitBndrs` to work in `rnFamInstEqn`, it needs
to be able to look up names from the parent class (in the event
that we are renaming an associated type family instance). As a
result, `rnImplicitBndrs` now takes an argument of type
`Maybe assoc`, which is `Just` in the event that a type family
instance is associated with a class.
* Previously, GHC kept track of three type synonyms for free type
variables in the renamer: `FreeKiTyVars`, `FreeKiTyVarsDups`
(which are allowed to contain duplicates)`, and
`FreeKiTyVarsNoDups` (which contain no duplicates). However, making
is a distinction between `-Dups` and `-NoDups` is now pointless, as
all code that returns `FreeKiTyVars{,Dups,NoDups}` will eventually
end up being passed to `rnImplicitBndrs`, which removes duplicates.
As a result, I decided to just get rid of `FreeKiTyVarsDups` and
`FreeKiTyVarsNoDups`, leaving only `FreeKiTyVars`.
* The `bindLRdrNames` and `deleteBys` functions are now dead code, so
I took the liberty of removing them.
</pre>
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<h4>15 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#7d5c4067d35a03e35a4cca5354d5d55924822d4f">
compiler/GHC/Data/List/SetOps.hs
</a>
</li>
<li class="file-stats">
<a href="#892acbb198a9095c917740d3c1297b56df4e3b7e">
compiler/GHC/Rename/HsType.hs
</a>
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<li class="file-stats">
<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
</a>
</li>
<li class="file-stats">
<a href="#9ea832ccdb4b5f7508a1efd6caedeafa16b269e7">
compiler/GHC/Tc/Gen/Splice.hs
</a>
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<li class="file-stats">
<a href="#bab8232ea328f0db8fa1136f6664e6abc5f20e3f">
testsuite/tests/indexed-types/should_compile/ExplicitForAllFams2.stderr
</a>
</li>
<li class="file-stats">
<a href="#416260ec88bfaa6b764cd4b71a7e18a526cfd50f">
testsuite/tests/indexed-types/should_compile/T16356_Compile2.stderr
</a>
</li>
<li class="file-stats">
<a href="#8e1bdb9c5132b51caa1a3e10f9ae595b613cbd8a">
testsuite/tests/indexed-types/should_compile/T16632.stderr
</a>
</li>
<li class="file-stats">
<a href="#22dbe064cc54965b36bb690263e0ab89828159d9">
testsuite/tests/indexed-types/should_compile/UnusedTyVarWarnings.stderr
</a>
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<li class="file-stats">
<a href="#1bdaccfcf93b6c37f86c5dafb4ce9d3e874cbd38">
testsuite/tests/indexed-types/should_compile/UnusedTyVarWarningsNamedWCs.stderr
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</li>
<li class="file-stats">
<a href="#2f8639f62c2c4ae0dcc66cb44772f4f2228e45c9">
testsuite/tests/indexed-types/should_fail/T17008a.stderr
</a>
</li>
<li class="file-stats">
<a href="#d3b6cb4888386d52e22c645da13d355ac1629bc7">
testsuite/tests/indexed-types/should_fail/T7536.stderr
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</li>
<li class="file-stats">
<a href="#8002e66eed40ca81c468dbef70930ddc68b86514">
testsuite/tests/polykinds/T11203.stderr
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</li>
<li class="file-stats">
<a href="#44e7d3215673e7a33ed423b8e2e03e84c07a5215">
testsuite/tests/polykinds/T11821a.stderr
</a>
</li>
<li class="file-stats">
<a href="#c73838e6c9bd0f720515ce80dcea91669cf91077">
testsuite/tests/typecheck/should_fail/T17566b.stderr
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</li>
<li class="file-stats">
<a href="#ac98db3b9555fd0bd588a6e89f129dd82b4e696c">
testsuite/tests/typecheck/should_fail/T17566c.stderr
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</li>
</ul>
<h4>Changes:</h4>
<li id="7d5c4067d35a03e35a4cca5354d5d55924822d4f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/285f281743865ea1657cd734527c7c3fc64bd0f7#7d5c4067d35a03e35a4cca5354d5d55924822d4f"><strong>compiler/GHC/Data/List/SetOps.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -10,7 +10,7 @@</td>
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<pre style="margin: 0;"> <span id="LC10" 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="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Avoid using them as much as possible</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Data.List.SetOps</span> <span class="p">(</span></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unionLists</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">minusList</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">deleteBys</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unionLists</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">minusList</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Association lists</span></span>
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<td class="diff-line-num old_line" data-linenumber="16" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Assoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocMaybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocUsing</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocDefault</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">assocDefaultUsing</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="39" 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="39" 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">@@ -39,11 +39,6 @@ getNth :: Outputable a => [a] -> Int -> a</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="n" style="color: #333;">getNth</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">xs</span> <span class="p">`</span><span class="n" style="color: #333;">lengthExceeds</span><span class="p">`</span> <span class="n" style="color: #333;">n</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xs</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">!!</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="haskell"><span class="n" style="color: #333;">deleteBys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC43" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (deleteBys eq xs ys) returns xs-ys, using the given equality function</span></span>
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<pre style="margin: 0;">-<span id="LC44" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Just like 'Data.List.delete' but with an equality function</span></span>
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<pre style="margin: 0;">-<span id="LC45" class="line" lang="haskell"><span class="n" style="color: #333;">deleteBys</span> <span class="n" style="color: #333;">eq</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl'</span> <span class="p">(</span><span class="n" style="color: #333;">flip</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">deleteBy</span> <span class="n" style="color: #333;">eq</span><span class="p">))</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys</span></span>
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<pre style="margin: 0;">-<span id="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC42" 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="LC43" 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="LC44" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<li id="892acbb198a9095c917740d3c1297b56df4e3b7e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/285f281743865ea1657cd734527c7c3fc64bd0f7#892acbb198a9095c917740d3c1297b56df4e3b7e"><strong>compiler/GHC/Rename/HsType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -24,11 +24,11 @@ module GHC.Rename.HsType (</td>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Binding related stuff</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">bindLHsTyVarBndr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bindLHsTyVarBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rnImplicitBndrs</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">bindSigTyVarsFV</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bindHsQTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bindLRdrNames</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">bindSigTyVarsFV</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bindHsQTyVars</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractHsTyRdrTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractHsTyRdrTyVarsKindVars</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractHsTysRdrTyVarsDups</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractRdrKindSigVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractDataDefnKindVars</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractHsTvBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractHsTyArgRdrKiTyVarsDup</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractHsTysRdrTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractRdrKindSigVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractDataDefnKindVars</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractHsTvBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractHsTyArgRdrKiTyVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">forAllOrNothing</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nubL</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -56,7 +56,6 @@ import GHC.Types.Name.Set</td>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.FieldLabel</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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59
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.List.SetOps</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">deleteBys</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">compareFixity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">funTyFixity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">negateFixity</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Fixity</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">FixityDirection</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">LexicalFixity</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="163" 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">@@ -164,14 +163,14 @@ rn_hs_sig_wc_type :: HsSigWcTypeScoping -> HsDocContext -> Maybe SDoc</td>
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164
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"><span class="n" style="color: #333;">rn_hs_sig_wc_type</span> <span class="n" style="color: #333;">scoping</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">check_inferred_vars</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">free_vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">filterInScopeM</span> <span class="p">(</span><span class="n" style="color: #333;">extractHsTyRdrTyVars<span class="idiff left right">Dups</span></span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">free_vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">filterInScopeM</span> <span class="p">(</span><span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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168
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">nwc_rdrs'</span><span class="p">,</span> <span class="n" style="color: #333;">tv_rdrs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">partition_nwcs</span> <span class="n" style="color: #333;">free_vars</span></span>
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169
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nwc_rdrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nubL</span> <span class="n" style="color: #333;">nwc_rdrs'</span></span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">scoping</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AlwaysBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">tv_rdrs</span></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BindUnlessForall</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isLHsForAllTy</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span> <span class="n" style="color: #333;">tv_rdrs</span></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NeverBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="n" style="color: #333;">implicit_bndrs</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;">vars</span> <span class="o" style="font-weight: 600;">-></span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nothing</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">implicit_bndrs</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;">vars</span> <span class="o" style="font-weight: 600;">-></span></span>
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175
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174
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hs_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnWcBody</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">nwc_rdrs</span> <span class="n" style="color: #333;">hs_ty</span></span>
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176
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175
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">wcs</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">hs_ty'</span></span>
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177
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176
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<pre style="margin: 0;"> <span id="LC176" 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;">res</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="179" 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="178" 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">@@ -179,7 +178,8 @@ rn_hs_sig_wc_type scoping ctxt inf_err hs_ty thing_inside</td>
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179
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178
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsWcType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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180
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179
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsWcType</span> <span class="n" style="color: #333;">ctxt</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;">hs_ty</span> <span class="p">})</span></span>
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181
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180
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<pre style="margin: 0;"> <span id="LC180" 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;">free_vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">filterInScopeM</span> <span class="p">(</span><span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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182
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">nwc_rdrs</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;">partition_nwcs</span> <span class="n" style="color: #333;">free_vars</span></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">nwc_rdrs'</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;">partition_nwcs</span> <span class="n" style="color: #333;">free_vars</span></span>
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182
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nwc_rdrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nubL</span> <span class="n" style="color: #333;">nwc_rdrs'</span></span>
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183
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183
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hs_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnWcBody</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">nwc_rdrs</span> <span class="n" style="color: #333;">hs_ty</span></span>
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184
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184
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">sig_ty'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="p">{</span> <span class="n" style="color: #333;">hswc_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wcs</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;">hs_ty'</span> <span class="p">}</span></span>
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185
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185
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<pre style="margin: 0;"> <span id="LC185" 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;">sig_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="328" 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="328" 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">@@ -328,8 +328,8 @@ rnHsSigType ctx level inf_err (HsIB { hsib_body = hs_ty })</td>
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328
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328
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">check_inferred_vars</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">hs_ty</span></span>
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329
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329
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<pre style="margin: 0;"> <span id="LC329" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">vars0</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isLHsForAllTy</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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330
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330
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">filterInScope</span> <span class="n" style="color: #333;">rdr_env</span></span>
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331
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTyRdrTyVars<span class="idiff left right">Dups</span></span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="n" style="color: #333;">vars0</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;">vars</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nothing</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">vars0</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;">vars</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">body'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsTyKi</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyKiEnv</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">level</span> <span class="kt" style="color: #458; font-weight: 600;">RnTypeBody</span><span class="p">)</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">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;">vars</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">@@ -357,9 +357,9 @@ forAllOrNothing :: Bool</td>
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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 do not want to bring 'b' into scope, hence True</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;">-- But f :: a -> b</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;">-- we want to bring both 'a' and 'b' into scope, hence False</span></span>
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<pre style="margin: 0;">-<span id="LC360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left right">WithDups</span></span></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</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;">-- ^ Free vars of the type</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="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left right">WithDups</span></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="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"><span class="n" style="color: #333;">forAllOrNothing</span> <span class="n" style="color: #333;">has_outer_forall</span> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">has_outer_forall</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"forAllOrNothing"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"has explicit outer forall"</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="368" 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">@@ -368,24 +368,50 @@ forAllOrNothing has_outer_forall fvs = case has_outer_forall of</td>
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<pre style="margin: 0;"> <span id="LC368" class="line" lang="haskell"> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"forAllOrNothing"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"no explicit forall. implicit binders:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fvs</span></span>
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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">fvs</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="LC371" class="line" lang="haskell"><span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">assoc</span></span>
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ @'Just' _@ => an associated type decl</span></span>
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Surface-syntax free vars that we will implicitly bind.</span></span>
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- May have duplicates, which <span class="idiff left right">is checked here</span></span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- May have duplicates, which <span class="idiff left right">are removed here.</span></span></span>
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<pre style="margin: 0;"> <span id="LC376" 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;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC376" class="line" lang="haskell"><span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="n" style="color: #333;">implicit_vs_with_dups</span></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"><span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="n" style="color: #333;">mb_assoc</span> <span class="n" style="color: #333;">implicit_vs_with_dups</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="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;">implicit_vs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nubL</span> <span class="n" style="color: #333;">implicit_vs_with_dups</span></span>
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"rnImplicitBndrs"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implicit_vs_with_dups</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implicit_vs</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use the currently set SrcSpan as the new source location for each Name.</span></span>
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Source locations for implicitly bound type variables].</span></span>
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getSrcSpanM</span></span>
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">new<span class="idiff left right">LocalBndrRn</span></span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span><span class="p">)</span> <span class="n" style="color: #333;">implicit_vs</span></span>
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">new<span class="idiff left">TyVarNameRn</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mb_assoc</span></span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span><span class="p">)</span> <span class="n" style="color: #333;">implicit_vs</span></span>
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385
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388
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"></span>
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386
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389
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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">bindLocalNamesFV</span> <span class="n" style="color: #333;">vars</span> <span class="o" style="font-weight: 600;">$</span></span>
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387
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390
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<pre style="margin: 0;"> <span id="LC390" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">vars</span> <span class="p">}</span></span>
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388
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391
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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell"></span>
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392
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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></span>
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393
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Source locations for implicitly bound type variables]</span></span>
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394
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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395
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When bringing implicitly bound type variables into scope (in rnImplicitBndrs),</span></span>
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396
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we do something peculiar: we drop the original SrcSpan attached to each</span></span>
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397
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variable and replace it with the currently set SrcSpan. Moreover, this new</span></span>
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398
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">SrcSpan is usually /less/ precise than the original one, and that's OK. To see</span></span>
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399
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">why this is done, consider the following example:</span></span>
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400
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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell"></span>
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401
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<pre style="margin: 0;">+<span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: a -> b -> a</span></span>
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402
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<pre style="margin: 0;">+<span id="LC402" class="line" lang="haskell"></span>
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403
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose that a warning or error message needs to point to the SrcSpans of the</span></span>
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404
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">binding sites for `a` and `b`. But where /are/ they bound, anyway? Technically,</span></span>
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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">they're bound by an unwritten `forall` at the front of the type signature, but</span></span>
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406
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">there is no SrcSpan for that. We could point to the first occurrence of `a` as</span></span>
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407
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the binding site for `a`, but that would make the first occurrence of `a`</span></span>
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408
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<pre style="margin: 0;">+<span id="LC408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">special. Moreover, we don't want IDEs to confuse binding sites and occurrences.</span></span>
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409
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell"></span>
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410
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As a result, we make the `SrcSpan`s for `a` and `b` span the entirety of the</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type signature, since the type signature implicitly carries their binding</span></span>
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<pre style="margin: 0;">+<span id="LC412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sites. This is less precise, but more accurate.</span></span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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414
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="haskell"></span>
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415
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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell"><span class="n" style="color: #333;">check_inferred_vars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span></span>
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416
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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417
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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The error msg if the signature is not allowed to contain</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">@@ -831,24 +857,13 @@ bindSigTyVarsFV tvs thing_inside</td>
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831
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span></span>
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"> <span class="n" style="color: #333;">bindLocalNamesFV</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">thing_inside</span> <span class="p">}</span></span>
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"></span>
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834
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<pre style="margin: 0;">-<span id="LC834" class="line" lang="haskell"><span class="cd">-- | Simply bring a bunch of RdrNames into scope. No checking for</span></span>
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835
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<pre style="margin: 0;">-<span id="LC835" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- validity, at all. The binding location is taken from the location</span></span>
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836
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<pre style="margin: 0;">-<span id="LC836" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- on each name.</span></span>
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837
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<pre style="margin: 0;">-<span id="LC837" class="line" lang="haskell"><span class="n" style="color: #333;">bindLRdrNames</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span></span>
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838
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<pre style="margin: 0;">-<span id="LC838" 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;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">))</span></span>
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839
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<pre style="margin: 0;">-<span id="LC839" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC840" class="line" lang="haskell"><span class="n" style="color: #333;">bindLRdrNames</span> <span class="n" style="color: #333;">rdrs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">-<span id="LC841" 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;">var_names</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;">newTyVarNameRn</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="n" style="color: #333;">rdrs</span></span>
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<pre style="margin: 0;">-<span id="LC842" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">bindLocalNamesFV</span> <span class="n" style="color: #333;">var_names</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC843" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">var_names</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC844" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------</span></span>
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846
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"><span class="n" style="color: #333;">bindHsQTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span></span>
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847
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862
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span></span>
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848
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863
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="c1" style="color: #998; font-style: italic;">-- Just d => check for unused tvs</span></span>
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849
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864
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- d is a phrase like "in the type ..."</span></span>
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850
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- Just _ => an associated type decl</span></span>
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851
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<pre style="margin: 0;">-<span id="LC851" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p"><span class="idiff left">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Located</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RdrName</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Kind variables from scope, no dups</span></span></span>
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866
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">FreeKiTyVars</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Kind variables from scope</span></span></span>
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852
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867
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<pre style="margin: 0;"> <span id="LC867" 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;">LHsQTyVars</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span></span>
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853
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868
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<pre style="margin: 0;"> <span id="LC868" 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;">LHsQTyVars</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;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">))</span></span>
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854
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869
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The Bool is True <=> all kind variables used in the</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">@@ -871,10 +886,10 @@ bindHsQTyVars doc mb_in_doc mb_assoc body_kv_occs hsq_bndrs thing_inside</td>
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871
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886
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<pre style="margin: 0;"> <span id="LC886" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- all these various things are doing</span></span>
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872
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887
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<pre style="margin: 0;"> <span id="LC887" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">implicit_kvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span></span>
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873
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888
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<pre style="margin: 0;"> <span id="LC888" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">hsLTyVarLocName</span> <span class="n" style="color: #333;">hs_tv_bndrs</span></span>
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874
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"> <span class="n" style="color: #333;">implicit_kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">nubL</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;">filterFreeVarsToBind</span> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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889
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<pre style="margin: 0;">+<span id="LC889" class="line" lang="haskell"> <span class="n" style="color: #333;">implicit_kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterFreeVarsToBind</span> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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875
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890
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<pre style="margin: 0;"> <span id="LC890" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr_kv_occs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">body_kv_occs</span></span>
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876
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">del</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">deleteBys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">eqLocated</span></span></span>
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877
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">body_remaining</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">body_kv_occs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">del</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bndrs</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">del</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bndr</span>_kv_occs</span></span>
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891
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<pre style="margin: 0;">+<span id="LC891" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">body_remaining</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">filterFreeVarsToBind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bndr_kv_occs</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="LC892" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">filterFreeVarsToBind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bndrs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">body</span>_kv_occs</span></span>
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<pre style="margin: 0;"> <span id="LC893" class="line" lang="haskell"> <span class="n" style="color: #333;">all_bound_on_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">body_remaining</span></span>
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894
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<pre style="margin: 0;"> <span id="LC894" class="line" lang="haskell"></span>
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895
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<pre style="margin: 0;"> <span id="LC895" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"checkMixedVars3"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -885,9 +900,7 @@ bindHsQTyVars doc mb_in_doc mb_assoc body_kv_occs hsq_bndrs thing_inside</td>
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885
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900
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<pre style="margin: 0;"> <span id="LC900" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"body_remaining"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">body_remaining</span></span>
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886
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901
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<pre style="margin: 0;"> <span id="LC901" class="line" lang="haskell"> <span class="p">]</span></span>
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902
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<pre style="margin: 0;"> <span id="LC902" class="line" lang="haskell"></span>
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888
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<pre style="margin: 0;">-<span id="LC888" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">implicit_kv_nms</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;">newTyVarNameRn</span> <span class="n" style="color: #333;">mb_assoc</span><span class="p">)</span> <span class="n" style="color: #333;">implicit_kvs</span></span>
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889
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<pre style="margin: 0;">-<span id="LC889" class="line" lang="haskell"></span>
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890
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<pre style="margin: 0;">-<span id="LC890" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">bindLocalNamesFV</span> <span class="n" style="color: #333;">implicit_kv_nms</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC903" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="n" style="color: #333;">mb_assoc</span> <span class="n" style="color: #333;">implicit_kvs</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;">implicit_kv_nms</span> <span class="o" style="font-weight: 600;">-></span></span>
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904
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<pre style="margin: 0;"> <span id="LC904" class="line" lang="haskell"> <span class="n" style="color: #333;">bindLHsTyVarBndrs</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">mb_in_doc</span> <span class="n" style="color: #333;">mb_assoc</span> <span class="n" style="color: #333;">hs_tv_bndrs</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;">rn_bndrs</span> <span class="o" style="font-weight: 600;">-></span></span>
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892
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905
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<pre style="margin: 0;"> <span id="LC905" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"bindHsQTyVars"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hsq_bndrs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implicit_kv_nms</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rn_bndrs</span><span class="p">)</span></span>
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906
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<pre style="margin: 0;"> <span id="LC906" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">thing_inside</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQTvs</span> <span class="p">{</span> <span class="n" style="color: #333;">hsq_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_kv_nms</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="922" 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">@@ -909,12 +922,12 @@ Then:</td>
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> body_kv_occs = [k2,k1], kind variables free in the</span></span>
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923
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<pre style="margin: 0;"> <span id="LC923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> result kind signature</span></span>
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924
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"></span>
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912
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<pre style="margin: 0;">-<span id="LC912" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> implicit_kvs = [k1,k2], kind variables free in kind signatures</span></span>
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913
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<pre style="margin: 0;">-<span id="LC913" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of hs_tv_bndrs, and not bound by bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC925" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> implicit_kvs = [k1,k2<span class="idiff left right">,k1</span>], kind variables free in kind signatures</span></span>
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<pre style="margin: 0;">+<span id="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> </span>of hs_tv_bndrs, and not bound by bndrs</span></span>
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927
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We want to quantify add implicit bindings for implicit_kvs</span></span>
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929
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<pre style="margin: 0;"> <span id="LC929" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* If <span class="idiff left right">implicit_body_kv</span>s is non-empty, then there is a kind variable</span></span>
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* If <span class="idiff left right">body_kv_occ</span>s is non-empty, then there is a kind variable</span></span>
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918
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931
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<pre style="margin: 0;"> <span id="LC931" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mentioned in the kind signature that is not bound "on the left".</span></span>
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919
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932
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<pre style="margin: 0;"> <span id="LC932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> That's one of the rules for a CUSK, so we pass that info on</span></span>
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933
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<pre style="margin: 0;"> <span id="LC933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> as the second argument to thing_inside.</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">@@ -922,6 +935,9 @@ Then:</td>
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922
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935
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<pre style="margin: 0;"> <span id="LC935" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Order is not important in these lists. All we are doing is</span></span>
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923
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936
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<pre style="margin: 0;"> <span id="LC936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bring Names into scope.</span></span>
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937
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<pre style="margin: 0;"> <span id="LC937" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* bndr_kv_occs, body_kv_occs, and implicit_kvs can contain duplicates. All</span></span>
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> duplicate occurrences are removed when we bind them with rnImplicitBndrs.</span></span>
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"></span>
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941
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<pre style="margin: 0;"> <span id="LC941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Finally, you may wonder why filterFreeVarsToBind removes in-scope variables</span></span>
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942
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<pre style="margin: 0;"> <span id="LC942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from bndr/body_kv_occs. How can anything be in scope? Answer:</span></span>
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943
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<pre style="margin: 0;"> <span id="LC943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">HsQTyVars is /also/ used (slightly oddly) for Haskell-98 syntax</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">@@ -1040,14 +1056,15 @@ bindLHsTyVarBndr doc mb_assoc (L loc (KindedTyVar x fl lrdr@(L lv _) kind))</td>
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1056
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<pre style="margin: 0;"> <span id="LC1056" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">thing_inside</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;">KindedTyVar</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">fl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">lv</span> <span class="n" style="color: #333;">tv_nm</span><span class="p">)</span> <span class="n" style="color: #333;">kind'</span><span class="p">))</span></span>
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1041
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1057
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<pre style="margin: 0;"> <span id="LC1057" 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;">b</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="p">}</span></span>
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1058
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<pre style="margin: 0;"> <span id="LC1058" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1043" class="line" lang="haskell"><span class="n" style="color: #333;">newTyVarNameRn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</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;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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1044
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<pre style="margin: 0;">-<span id="LC1044" class="line" lang="haskell"><span class="n" style="color: #333;">newTyVarNameRn</span> <span class="n" style="color: #333;">mb_assoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">rdr</span><span class="p">)</span></span>
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1059
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<pre style="margin: 0;">+<span id="LC1059" class="line" lang="haskell"><span class="n" style="color: #333;">newTyVarNameRn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- associated class</span></span>
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1060
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<pre style="margin: 0;">+<span id="LC1060" class="line" lang="haskell"> <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;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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1061
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<pre style="margin: 0;">+<span id="LC1061" class="line" lang="haskell"><span class="n" style="color: #333;">newTyVarNameRn</span> <span class="n" style="color: #333;">mb_assoc</span> <span class="n" style="color: #333;">lrdr</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">rdr</span><span class="p">)</span></span>
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1045
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1062
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<pre style="margin: 0;"> <span id="LC1062" 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;">rdr_env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLocalRdrEnv</span></span>
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1046
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1063
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">mb_assoc</span><span class="p">,</span> <span class="n" style="color: #333;">lookupLocalRdrEnv</span> <span class="n" style="color: #333;">rdr_env</span> <span class="n" style="color: #333;">rdr</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1047
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">n</span></span>
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1048
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use the same Name as the parent class decl</span></span>
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1049
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1066
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<pre style="margin: 0;"> <span id="LC1066" class="line" lang="haskell"></span>
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1050
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<pre style="margin: 0;">-<span id="LC1050" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">newLocalBndrRn</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">L</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rdr</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">}</span></span>
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1067
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">newLocalBndrRn</span> <span class="n" style="color: #333;"><span class="idiff left right">lrdr</span></span> <span class="p">}</span></span>
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1051
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1068
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1052
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1069
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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*********************************************************</span></span>
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1053
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1070
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1504" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1504,7 +1521,10 @@ To do that, we need to walk over a type and find its free type/kind variables.</td>
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1504
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1521
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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We preserve the left-to-right order of each variable occurrence.</span></span>
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1505
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1522
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<pre style="margin: 0;"> <span id="LC1522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [Ordering of implicit variables].</span></span>
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1506
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1523
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<pre style="margin: 0;"> <span id="LC1523" class="line" lang="haskell"></span>
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1507
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<pre style="margin: 0;">-<span id="LC1507" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Clients of this code can remove duplicates with nubL.</span></span>
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1524
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<pre style="margin: 0;">+<span id="LC1524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It is common for lists of free type variables to contain duplicates. For</span></span>
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1525
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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example, in `f :: a -> a`, the free type variable list is [a, a]. When these</span></span>
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1526
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<pre style="margin: 0;">+<span id="LC1526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">implicitly bound variables are brought into scope (with rnImplicitBndrs),</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1527" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1527
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<pre style="margin: 0;">+<span id="LC1527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">duplicates are removed with nubL.</span></span>
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1508
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1528
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<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"></span>
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1509
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1529
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<pre style="margin: 0;"> <span id="LC1529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Ordering of implicit variables]</span></span>
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1510
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1530
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<pre style="margin: 0;"> <span id="LC1530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1533" 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="1553" 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">@@ -1533,9 +1553,8 @@ the a in the code. Thus, GHC does ScopedSort on the variables.</td>
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1533
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1553
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<pre style="margin: 0;"> <span id="LC1553" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [ScopedSort] in GHC.Core.Type.</span></span>
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1534
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1554
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<pre style="margin: 0;"> <span id="LC1554" class="line" lang="haskell"></span>
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1535
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1555
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<pre style="margin: 0;"> <span id="LC1555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Implicitly bound variables are collected by any function which returns a</span></span>
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1536
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<pre style="margin: 0;">-<span id="LC1536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">FreeKiTyVars, FreeKiTyVarsWithDups, or FreeKiTyVarsNoDups, which notably</span></span>
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1537
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<pre style="margin: 0;">-<span id="LC1537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">includes the `extract-` family of functions (extractHsTysRdrTyVarsDups,</span></span>
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1538
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<pre style="margin: 0;">-<span id="LC1538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">extractHsTyVarBndrsKVs, etc.).</span></span>
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1556
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<pre style="margin: 0;">+<span id="LC1556" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">FreeKiTyVars, which notably includes the `extract-` family of functions</span></span>
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1557
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<pre style="margin: 0;">+<span id="LC1557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(extractHsTysRdrTyVars, extractHsTyVarBndrsKVs, etc.).</span></span>
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1539
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1558
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<pre style="margin: 0;"> <span id="LC1558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">These functions thus promise to keep left-to-right ordering.</span></span>
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1540
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1559
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<pre style="margin: 0;"> <span id="LC1559" class="line" lang="haskell"></span>
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1541
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1560
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<pre style="margin: 0;"> <span id="LC1560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Implicit quantification in type synonyms]</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">@@ -1621,18 +1640,13 @@ type checking. While viable, this would mean we'd end up accepting this:</td>
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1621
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1640
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<pre style="margin: 0;"> <span id="LC1640" class="line" lang="haskell"></span>
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1622
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1641
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<pre style="margin: 0;"> <span id="LC1641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1623
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1642
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<pre style="margin: 0;"> <span id="LC1642" class="line" lang="haskell"></span>
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1643
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<pre style="margin: 0;">+<span id="LC1643" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- A list of free type/kind variables, which can contain duplicates.</span></span>
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1624
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1644
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<pre style="margin: 0;"> <span id="LC1644" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Kind and type-variable binders]</span></span>
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1625
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1645
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<pre style="margin: 0;"> <span id="LC1645" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- These lists are guaranteed to preserve left-to-right ordering of</span></span>
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1626
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1646
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<pre style="margin: 0;"> <span id="LC1646" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the types the variables were extracted from. See also</span></span>
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1627
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1647
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<pre style="margin: 0;"> <span id="LC1647" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Ordering of implicit variables].</span></span>
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1628
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1648
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<pre style="margin: 0;"> <span id="LC1648" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span></span>
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1629
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1649
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<pre style="margin: 0;"> <span id="LC1649" class="line" lang="haskell"></span>
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1630
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<pre style="margin: 0;">-<span id="LC1630" class="line" lang="haskell"><span class="cd">-- | A 'FreeKiTyVars' list that is allowed to have duplicate variables.</span></span>
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1631
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<pre style="margin: 0;">-<span id="LC1631" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1632
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<pre style="margin: 0;">-<span id="LC1632" class="line" lang="haskell"></span>
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1633
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<pre style="margin: 0;">-<span id="LC1633" class="line" lang="haskell"><span class="cd">-- | A 'FreeKiTyVars' list that contains no duplicate variables.</span></span>
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1634
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<pre style="margin: 0;">-<span id="LC1634" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsNoDups</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1635
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<pre style="margin: 0;">-<span id="LC1635" class="line" lang="haskell"></span>
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1636
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1650
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<pre style="margin: 0;"> <span id="LC1650" class="line" lang="haskell"><span class="cd">-- | Filter out any type and kind variables that are already in scope in the</span></span>
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1637
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1651
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<pre style="margin: 0;"> <span id="LC1651" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the supplied LocalRdrEnv. Note that this includes named wildcards, which</span></span>
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1638
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1652
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<pre style="margin: 0;"> <span id="LC1652" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- look like perfectly ordinary type variables at this point.</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">@@ -1650,46 +1664,32 @@ filterInScopeM vars</td>
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1664
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<pre style="margin: 0;"> <span id="LC1664" class="line" lang="haskell"><span class="n" style="color: #333;">inScope</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LocalRdrEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1651
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<pre style="margin: 0;"> <span id="LC1665" class="line" lang="haskell"><span class="n" style="color: #333;">inScope</span> <span class="n" style="color: #333;">rdr_env</span> <span class="n" style="color: #333;">rdr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rdr</span> <span class="p">`</span><span class="n" style="color: #333;">elemLocalRdrEnv</span><span class="p">`</span> <span class="n" style="color: #333;">rdr_env</span></span>
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1652
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1666
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<pre style="margin: 0;"> <span id="LC1666" class="line" lang="haskell"></span>
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1653
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<pre style="margin: 0;">-<span id="LC1653" class="line" lang="haskell"><span class="n" style="color: #333;">extract_tyarg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsTypeArg</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left">WithDups</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">FreeKiTyVarsWithDup</span>s</span></span>
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1667
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<pre style="margin: 0;">+<span id="LC1667" class="line" lang="haskell"><span class="n" style="color: #333;">extract_tyarg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsTypeArg</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">FreeKiTyVar</span>s</span></span>
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1654
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1668
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<pre style="margin: 0;"> <span id="LC1668" class="line" lang="haskell"><span class="n" style="color: #333;">extract_tyarg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsValArg</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_lty</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">acc</span></span>
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1655
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1669
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<pre style="margin: 0;"> <span id="LC1669" class="line" lang="haskell"><span class="n" style="color: #333;">extract_tyarg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTypeArg</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ki</span><span class="p">)</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_lty</span> <span class="n" style="color: #333;">ki</span> <span class="n" style="color: #333;">acc</span></span>
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1656
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1670
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<pre style="margin: 0;"> <span id="LC1670" class="line" lang="haskell"><span class="n" style="color: #333;">extract_tyarg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsArgPar</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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1671
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<pre style="margin: 0;"> <span id="LC1671" class="line" lang="haskell"></span>
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1658
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<pre style="margin: 0;">-<span id="LC1658" class="line" lang="haskell"><span class="n" style="color: #333;">extract_tyargs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LHsTypeArg</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left">WithDups</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">FreeKiTyVarsWithDup</span>s</span></span>
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1672
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<pre style="margin: 0;">+<span id="LC1672" class="line" lang="haskell"><span class="n" style="color: #333;">extract_tyargs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LHsTypeArg</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">FreeKiTyVar</span>s</span></span>
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1659
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1673
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<pre style="margin: 0;"> <span id="LC1673" class="line" lang="haskell"><span class="n" style="color: #333;">extract_tyargs</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">extract_tyarg</span> <span class="n" style="color: #333;">acc</span> <span class="n" style="color: #333;">args</span></span>
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1660
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1674
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<pre style="margin: 0;"> <span id="LC1674" class="line" lang="haskell"></span>
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1661
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<pre style="margin: 0;">-<span id="LC1661" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyArgRdrKiTyVars<span class="idiff left">Dup</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LHsTypeArg</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcPs</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">FreeKiTyVarsWithDup</span>s</span></span>
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1662
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<pre style="margin: 0;">-<span id="LC1662" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyArgRdrKiTyVars<span class="idiff left right">Dup</span></span> <span class="n" style="color: #333;">args</span></span>
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1675
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<pre style="margin: 0;">+<span id="LC1675" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyArgRdrKiTyVars</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LHsTypeArg</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcPs</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">FreeKiTyVar</span>s</span></span>
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1676
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<pre style="margin: 0;">+<span id="LC1676" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyArgRdrKiTyVars</span> <span class="n" style="color: #333;">args</span></span>
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1677
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<pre style="margin: 0;"> <span id="LC1677" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_tyargs</span> <span class="n" style="color: #333;">args</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1664
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1678
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<pre style="margin: 0;"> <span id="LC1678" class="line" lang="haskell"></span>
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1665
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1679
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<pre style="margin: 0;"> <span id="LC1679" class="line" lang="haskell"><span class="cd">-- | 'extractHsTyRdrTyVars' finds the type/kind variables</span></span>
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1666
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1680
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<pre style="margin: 0;"> <span id="LC1680" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of a HsType/HsKind.</span></span>
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1667
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1681
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<pre style="margin: 0;"> <span id="LC1681" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It's used when making the @forall@s explicit.</span></span>
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1668
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<pre style="margin: 0;">-<span id="LC1668" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When the same name occurs multiple times in the types, only the first</span></span>
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1669
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<pre style="margin: 0;">-<span id="LC1669" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- occurrence is returned.</span></span>
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1670
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1682
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<pre style="margin: 0;"> <span id="LC1682" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Kind and type-variable binders]</span></span>
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<pre style="margin: 0;">-<span id="LC1671" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsNoDups</span></span>
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1672
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<pre style="margin: 0;">-<span id="LC1672" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC1673" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nubL</span> <span class="p">(</span><span class="n" style="color: #333;">extractHsTyRdrTyVarsDups</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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1674
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<pre style="margin: 0;">-<span id="LC1674" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1675" class="line" lang="haskell"><span class="cd">-- | 'extractHsTyRdrTyVarsDups' finds the type/kind variables</span></span>
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<pre style="margin: 0;">-<span id="LC1676" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of a HsType/HsKind.</span></span>
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<pre style="margin: 0;">-<span id="LC1677" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It's used when making the @forall@s explicit.</span></span>
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<pre style="margin: 0;">-<span id="LC1678" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When the same name occurs multiple times in the types, all occurrences</span></span>
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<pre style="margin: 0;">-<span id="LC1679" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are returned.</span></span>
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<pre style="margin: 0;">-<span id="LC1680" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyRdrTyVarsDups</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;">-<span id="LC1681" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyRdrTyVarsDups</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC1682" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_lty</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC1683" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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<pre style="margin: 0;">+<span id="LC1684" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_lty</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC1685" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1686" class="line" lang="haskell"><span class="cd">-- | Extracts the free type/kind variables from the kind signature of a HsType.</span></span>
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<pre style="margin: 0;"> <span id="LC1687" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is used to implicitly quantify over @k@ in @type T = Nothing :: Maybe k@.</span></span>
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<pre style="margin: 0;">-<span id="LC1686" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When the same name occurs multiple times in the type, only the first</span></span>
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<pre style="margin: 0;">-<span id="LC1687" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- occurrence is returned, and the left-to-right order of variables is</span></span>
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<pre style="margin: 0;">-<span id="LC1688" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- preserved.</span></span>
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<pre style="margin: 0;">+<span id="LC1688" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The left-to-right order of variables is preserved.</span></span>
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<pre style="margin: 0;"> <span id="LC1689" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Kind and type-variable binders] and</span></span>
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<pre style="margin: 0;"> <span id="LC1690" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Ordering of implicit variables] and</span></span>
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<pre style="margin: 0;"> <span id="LC1691" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Implicit quantification in type synonyms].</span></span>
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<pre style="margin: 0;">-<span id="LC1692" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyRdrTyVarsKindVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left right">NoDups</span></span></span>
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<pre style="margin: 0;">+<span id="LC1692" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyRdrTyVarsKindVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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<pre style="margin: 0;"> <span id="LC1693" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyRdrTyVarsKindVars</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">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="LC1694" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC1695" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsParTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">extractHsTyRdrTyVarsKindVars</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1699,51 +1699,45 @@ extractHsTyRdrTyVarsKindVars (L _ ty) =</td>
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1699
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<pre style="margin: 0;"> <span id="LC1699" class="line" lang="haskell"><span class="cd">-- | Extracts free type and kind variables from types in a list.</span></span>
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<pre style="margin: 0;"> <span id="LC1700" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When the same name occurs multiple times in the types, all occurrences</span></span>
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<pre style="margin: 0;"> <span id="LC1701" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are returned.</span></span>
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<pre style="margin: 0;">-<span id="LC1702" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTysRdrTyVarsDups</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;">GhcPs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;">-<span id="LC1703" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTysRdrTyVarsDups</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC1704" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_ltys</span> <span class="n" style="color: #333;">tys</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC1702" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTysRdrTyVars</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;">GhcPs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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<pre style="margin: 0;">+<span id="LC1703" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTysRdrTyVars</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_ltys</span> <span class="n" style="color: #333;">tys</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC1704" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1705" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns the free kind variables of any explicitly-kinded binders, returning</span></span>
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<pre style="margin: 0;"> <span id="LC1706" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variable occurrences in left-to-right order.</span></span>
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<pre style="margin: 0;"> <span id="LC1707" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Ordering of implicit variables].</span></span>
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<pre style="margin: 0;"> <span id="LC1708" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: Does /not/ delete the binders themselves.</span></span>
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<pre style="margin: 0;">-<span id="LC1710" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- However duplicates are removed</span></span>
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<pre style="margin: 0;"> <span id="LC1709" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- E.g. given [k1, a:k1, b:k2]</span></span>
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<pre style="margin: 0;"> <span id="LC1710" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the function returns [k1,k2], even though k1 is bound here</span></span>
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<pre style="margin: 0;">-<span id="LC1713" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyVarBndrsKVs</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="n" style="color: #333;">flag</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsNoDups</span></span>
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<pre style="margin: 0;">-<span id="LC1714" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyVarBndrsKVs</span> <span class="n" style="color: #333;">tv_bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC1715" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nubL</span> <span class="p">(</span><span class="n" style="color: #333;">extract_hs_tv_bndrs_kvs</span> <span class="n" style="color: #333;">tv_bndrs</span><span class="p">)</span></span>
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1711
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<pre style="margin: 0;">+<span id="LC1711" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyVarBndrsKVs</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="n" style="color: #333;">flag</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1712
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<pre style="margin: 0;">+<span id="LC1712" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTyVarBndrsKVs</span> <span class="n" style="color: #333;">tv_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_hs_tv_bndrs_kvs</span> <span class="n" style="color: #333;">tv_bndrs</span></span>
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1716
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1713
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<pre style="margin: 0;"> <span id="LC1713" class="line" lang="haskell"></span>
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1717
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1714
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<pre style="margin: 0;"> <span id="LC1714" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns the free kind variables in a type family result signature, returning</span></span>
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1718
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<td class="diff-line-num new_line" data-linenumber="1715" 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">
1715
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<pre style="margin: 0;"> <span id="LC1715" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variable occurrences in left-to-right order.</span></span>
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1719
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1716
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<pre style="margin: 0;"> <span id="LC1716" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Ordering of implicit variables].</span></span>
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1720
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<pre style="margin: 0;">-<span id="LC1720" class="line" lang="haskell"><span class="n" style="color: #333;">extractRdrKindSigVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LFamilyResultSig</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="p"><span class="idiff left">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Located</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RdrName</span></span><span class="p"><span class="idiff right">]</span></span></span>
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1717
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<pre style="margin: 0;">+<span id="LC1717" class="line" lang="haskell"><span class="n" style="color: #333;">extractRdrKindSigVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LFamilyResultSig</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">FreeKiTyVars</span></span></span>
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1721
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1718
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<pre style="margin: 0;"> <span id="LC1718" class="line" lang="haskell"><span class="n" style="color: #333;">extractRdrKindSigVars</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">resultSig</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">resultSig</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1722
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1719
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<pre style="margin: 0;"> <span id="LC1719" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">KindSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">k</span></span>
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1723
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1720
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<pre style="margin: 0;"> <span id="LC1720" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindedTyVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">k</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">k</span></span>
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1724
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1721
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<pre style="margin: 0;"> <span id="LC1721" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1725
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1722
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<pre style="margin: 0;"> <span id="LC1722" class="line" lang="haskell"></span>
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1726
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1723
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<pre style="margin: 0;"> <span id="LC1723" class="line" lang="haskell"><span class="cd">-- | Get type/kind variables mentioned in the kind signature, preserving</span></span>
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1727
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<pre style="margin: 0;">-<span id="LC1727" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- left-to-right order<span class="idiff left right"> and without duplicates</span>:</span></span>
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1724
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<pre style="margin: 0;">+<span id="LC1724" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- left-to-right order:</span></span>
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1728
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1725
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<pre style="margin: 0;"> <span id="LC1725" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1729
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1726
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<pre style="margin: 0;"> <span id="LC1726" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * data T a (b :: k1) :: k2 -> k1 -> k2 -> Type -- result: [k2,k1]</span></span>
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1730
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1727
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<pre style="margin: 0;"> <span id="LC1727" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * data T a (b :: k1) -- result: []</span></span>
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1731
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1728
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<pre style="margin: 0;"> <span id="LC1728" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1732
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1729
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<pre style="margin: 0;"> <span id="LC1729" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Ordering of implicit variables].</span></span>
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<pre style="margin: 0;">-<span id="LC1733" class="line" lang="haskell"><span class="n" style="color: #333;">extractDataDefnKindVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDataDefn</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left right">NoDups</span></span></span>
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<pre style="margin: 0;">+<span id="LC1730" class="line" lang="haskell"><span class="n" style="color: #333;">extractDataDefnKindVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDataDefn</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1734
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1731
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<pre style="margin: 0;"> <span id="LC1731" class="line" lang="haskell"><span class="n" style="color: #333;">extractDataDefnKindVars</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsDataDefn</span> <span class="p">{</span> <span class="n" style="color: #333;">dd_kindSig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ksig</span> <span class="p">})</span></span>
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1735
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1732
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<pre style="margin: 0;"> <span id="LC1732" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">ksig</span></span>
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1736
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1733
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<pre style="margin: 0;"> <span id="LC1733" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1737" class="line" lang="haskell"><span class="n" style="color: #333;">extract_lctxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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1738
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<pre style="margin: 0;">-<span id="LC1738" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;">+<span id="LC1734" class="line" lang="haskell"><span class="n" style="color: #333;">extract_lctxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1739
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1735
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<pre style="margin: 0;"> <span id="LC1735" class="line" lang="haskell"><span class="n" style="color: #333;">extract_lctxt</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_ltys</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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1740
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1736
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<pre style="margin: 0;"> <span id="LC1736" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1741" class="line" lang="haskell"><span class="n" style="color: #333;">extract_ltys</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;">GhcPs</span><span class="p">]</span></span>
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1742
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<pre style="margin: 0;">-<span id="LC1742" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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1737
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<pre style="margin: 0;">+<span id="LC1737" class="line" lang="haskell"><span class="n" style="color: #333;">extract_ltys</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;">GhcPs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1738
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<pre style="margin: 0;"> <span id="LC1738" class="line" lang="haskell"><span class="n" style="color: #333;">extract_ltys</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">extract_lty</span> <span class="n" style="color: #333;">acc</span> <span class="n" style="color: #333;">tys</span></span>
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1739
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<pre style="margin: 0;"> <span id="LC1739" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1745" class="line" lang="haskell"><span class="n" style="color: #333;">extract_lty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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1746
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<pre style="margin: 0;">-<span id="LC1746" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;">+<span id="LC1740" class="line" lang="haskell"><span class="n" style="color: #333;">extract_lty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1741
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<pre style="margin: 0;"> <span id="LC1741" class="line" lang="haskell"><span class="n" style="color: #333;">extract_lty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">acc</span></span>
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1748
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1742
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<pre style="margin: 0;"> <span id="LC1742" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC1743" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsTyVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ltv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">extract_tv</span> <span class="n" style="color: #333;">ltv</span> <span class="n" style="color: #333;">acc</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">@@ -1784,15 +1778,15 @@ extract_lty (L _ ty) acc</td>
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<pre style="margin: 0;"> <span id="LC1778" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsWildCardTy</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC1779" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1780" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTvBndrs</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="n" style="color: #333;">flag</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC1787" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left">WithDups</span></span><span class="idiff right"> </span> <span class="c1" style="color: #998; font-style: italic;">-- Free in body</span></span>
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<pre style="margin: 0;">-<span id="LC1788" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left right">WithDups</span></span> <span class="c1" style="color: #998; font-style: italic;">-- Free in result</span></span>
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<pre style="margin: 0;">+<span id="LC1781" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span> <span class="c1" style="color: #998; font-style: italic;">-- Free in body</span></span>
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<pre style="margin: 0;">+<span id="LC1782" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span> <span class="c1" style="color: #998; font-style: italic;">-- Free in result</span></span>
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<pre style="margin: 0;"> <span id="LC1783" class="line" lang="haskell"><span class="n" style="color: #333;">extractHsTvBndrs</span> <span class="n" style="color: #333;">tv_bndrs</span> <span class="n" style="color: #333;">body_fvs</span></span>
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<pre style="margin: 0;"> <span id="LC1784" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_hs_tv_bndrs</span> <span class="n" style="color: #333;">tv_bndrs</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">body_fvs</span></span>
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<pre style="margin: 0;"> <span id="LC1785" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1786" class="line" lang="haskell"><span class="n" style="color: #333;">extract_hs_tv_bndrs</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="n" style="color: #333;">flag</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC1793" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left right">WithDups</span></span> <span class="c1" style="color: #998; font-style: italic;">-- Accumulator</span></span>
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<pre style="margin: 0;">-<span id="LC1794" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left right">WithDups</span></span> <span class="c1" style="color: #998; font-style: italic;">-- Free in body</span></span>
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<pre style="margin: 0;">-<span id="LC1795" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left right">WithDups</span></span></span>
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<pre style="margin: 0;">+<span id="LC1787" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span> <span class="c1" style="color: #998; font-style: italic;">-- Accumulator</span></span>
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<pre style="margin: 0;">+<span id="LC1788" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span> <span class="c1" style="color: #998; font-style: italic;">-- Free in body</span></span>
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<pre style="margin: 0;">+<span id="LC1789" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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<pre style="margin: 0;"> <span id="LC1790" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In (forall (a :: Maybe e). a -> b) we have</span></span>
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<pre style="margin: 0;"> <span id="LC1791" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'a' is bound by the forall</span></span>
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<pre style="margin: 0;"> <span id="LC1792" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'b' is a free type variable</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">@@ -1807,24 +1801,28 @@ extract_hs_tv_bndrs tv_bndrs acc_vars body_vars = new_vars ++ acc_vars</td>
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<pre style="margin: 0;"> <span id="LC1801" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_hs_tv_bndrs_kvs</span> <span class="n" style="color: #333;">tv_bndrs</span></span>
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1802
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<pre style="margin: 0;"> <span id="LC1802" class="line" lang="haskell"> <span class="n" style="color: #333;">tv_bndr_rdrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">hsLTyVarLocName</span> <span class="n" style="color: #333;">tv_bndrs</span></span>
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1809
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1803
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<pre style="margin: 0;"> <span id="LC1803" class="line" lang="haskell"></span>
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1810
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<pre style="margin: 0;">-<span id="LC1810" class="line" lang="haskell"><span class="n" style="color: #333;">extract_hs_tv_bndrs_kvs</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="n" style="color: #333;">flag</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left right">WithDups</span></span></span>
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<pre style="margin: 0;">+<span id="LC1804" class="line" lang="haskell"><span class="n" style="color: #333;">extract_hs_tv_bndrs_kvs</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="n" style="color: #333;">flag</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1811
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1805
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<pre style="margin: 0;"> <span id="LC1805" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns the free kind variables of any explicitly-kinded binders, returning</span></span>
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1812
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1806
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<pre style="margin: 0;"> <span id="LC1806" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variable occurrences in left-to-right order.</span></span>
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1813
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1807
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<pre style="margin: 0;"> <span id="LC1807" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Ordering of implicit variables].</span></span>
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1808
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<pre style="margin: 0;"> <span id="LC1808" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: Does /not/ delete the binders themselves.</span></span>
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<pre style="margin: 0;">-<span id="LC1815" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Duplicates are /not/ removed</span></span>
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<pre style="margin: 0;"> <span id="LC1809" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- E.g. given [k1, a:k1, b:k2]</span></span>
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1817
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<pre style="margin: 0;"> <span id="LC1810" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the function returns [k1,k2], even though k1 is bound here</span></span>
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1818
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1811
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<pre style="margin: 0;"> <span id="LC1811" class="line" lang="haskell"><span class="n" style="color: #333;">extract_hs_tv_bndrs_kvs</span> <span class="n" style="color: #333;">tv_bndrs</span> <span class="o" style="font-weight: 600;">=</span></span>
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1812
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<pre style="margin: 0;"> <span id="LC1812" class="line" lang="haskell"> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">extract_lty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1813
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<pre style="margin: 0;"> <span id="LC1813" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindedTyVar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">k</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tv_bndrs</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1814" class="line" lang="haskell"></span>
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1822
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<pre style="margin: 0;">-<span id="LC1822" class="line" lang="haskell"><span class="n" style="color: #333;">extract_tv</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;">RdrName</span></span>
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<pre style="margin: 0;">-<span id="LC1823" 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;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1815" class="line" lang="haskell"><span class="n" style="color: #333;">extract_tv</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;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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<pre style="margin: 0;"> <span id="LC1816" class="line" lang="haskell"><span class="n" style="color: #333;">extract_tv</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">=</span></span>
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1817
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<pre style="margin: 0;"> <span id="LC1817" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isRdrTyVar</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">tv</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">acc</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">acc</span></span>
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1826
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1818
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<pre style="margin: 0;"> <span id="LC1818" class="line" lang="haskell"></span>
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1827
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<pre style="margin: 0;">-<span id="LC1827" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Deletes duplicates in a list of Located things.</span></span>
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1819
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<pre style="margin: 0;">+<span id="LC1819" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Deletes duplicates in a list of Located things. This is used to:</span></span>
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1820
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<pre style="margin: 0;">+<span id="LC1820" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1821
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<pre style="margin: 0;">+<span id="LC1821" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Delete duplicate occurrences of implicitly bound type/kind variables when</span></span>
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1822
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<pre style="margin: 0;">+<span id="LC1822" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- bringing them into scope (in rnImplicitBndrs).</span></span>
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1823
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<pre style="margin: 0;">+<span id="LC1823" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1824
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<pre style="margin: 0;">+<span id="LC1824" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Delete duplicate occurrences of named wildcards (in rn_hs_sig_wc_type and</span></span>
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1825
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<pre style="margin: 0;">+<span id="LC1825" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- rnHsWcType).</span></span>
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1828
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1826
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<pre style="margin: 0;"> <span id="LC1826" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1829
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1827
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<pre style="margin: 0;"> <span id="LC1827" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Importantly, this function is stable with respect to the original ordering</span></span>
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1830
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1828
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<pre style="margin: 0;"> <span id="LC1828" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of things in the list. This is important, as it is a property that GHC</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">@@ -1838,9 +1836,9 @@ nubL = nubBy eqLocated</td>
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<pre style="margin: 0;"> <span id="LC1836" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- already in scope, or are explicitly bound in the binder.</span></span>
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1839
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<pre style="margin: 0;"> <span id="LC1837" class="line" lang="haskell"><span class="n" style="color: #333;">filterFreeVarsToBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1840
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<pre style="margin: 0;"> <span id="LC1838" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Explicitly bound here</span></span>
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1841
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<pre style="margin: 0;">-<span id="LC1841" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left right">WithDups</span></span></span>
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1839
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<pre style="margin: 0;">+<span id="LC1839" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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<pre style="margin: 0;"> <span id="LC1840" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Potential implicit binders</span></span>
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<pre style="margin: 0;">-<span id="LC1843" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars<span class="idiff left right">WithDups</span></span></span>
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<pre style="margin: 0;">+<span id="LC1841" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1842
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<pre style="margin: 0;"> <span id="LC1842" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Final implicit binders</span></span>
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<pre style="margin: 0;"> <span id="LC1843" class="line" lang="haskell"><span class="n" style="color: #333;">filterFreeVarsToBind</span> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterOut</span> <span class="n" style="color: #333;">is_in_scope</span></span>
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<pre style="margin: 0;"> <span id="LC1844" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make sure to list the binder kvs before the body kvs, as mandated by</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">@@ -664,7 +664,7 @@ rnClsInstDecl (ClsInstDecl { cid_poly_ty = inst_ty, cid_binds = mbinds</td>
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC665" class="line" lang="haskell"><span class="n" style="color: #333;">rnFamInstEqn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span></span>
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<pre style="margin: 0;"> <span id="LC666" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInfo</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="p"><span class="idiff left">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Located</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RdrName</span></span><span class="p"><span class="idiff right">]</span></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="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">FreeKiTyVars</span></span></span>
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<pre style="margin: 0;"> <span id="LC668" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Kind variables from the equation's RHS to be implicitly bound</span></span>
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<pre style="margin: 0;"> <span id="LC669" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if no explicit forall.</span></span>
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<pre style="margin: 0;"> <span id="LC670" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEqn</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="n" style="color: #333;">rhs</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">@@ -681,9 +681,10 @@ rnFamInstEqn doc atfi rhs_kvars</td>
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamDeflt</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cls</span></span>
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<pre style="margin: 0;"> <span id="LC682" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInst</span> <span class="n" style="color: #333;">cls</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cls</span></span>
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<pre style="margin: 0;"> <span id="LC683" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tycon'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupFamInstName</span> <span class="n" style="color: #333;">mb_cls</span> <span class="n" style="color: #333;">tycon</span></span>
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<pre style="margin: 0;">-<span id="LC684" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pat_kity_vars_with_dups</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extractHsTyArgRdrKiTyVarsDup</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">-<span id="LC685" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use the "...Dups" form because it's needed</span></span>
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<pre style="margin: 0;">-<span id="LC686" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- below to report unused binder on the LHS</span></span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pat_kity_vars_with_dups</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extractHsTyArgRdrKiTyVars</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It is crucial that extractHsTyArgRdrKiTyVars return</span></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- duplicate occurrences, since they're needed below to help</span></span>
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- determine unused binders on the LHS.</span></span>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">mb_bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC690" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -713,48 +714,42 @@ rnFamInstEqn doc atfi rhs_kvars</td>
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No need to filter out explicit binders (the 'mb_bndrs = Just</span></span>
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- explicit_bndrs' case) because there must be none if we're going</span></span>
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<pre style="margin: 0;"> <span id="LC716" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to implicitly bind anything, per the previous comment.</span></span>
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<pre style="margin: 0;">-<span id="LC716" class="line" lang="haskell"> <span class="n" style="color: #333;">nubL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">pat_kity_vars_with_dups</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">rhs_kvars</span></span>
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<pre style="margin: 0;">-<span id="LC717" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">all_imp_var_names</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;">newTyVarNameRn</span> <span class="n" style="color: #333;">mb_cls</span><span class="p">)</span> <span class="n" style="color: #333;">all_imp_vars</span></span>
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<pre style="margin: 0;">-<span id="LC718" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC719" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- All the free vars of the family patterns</span></span>
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<pre style="margin: 0;">-<span id="LC720" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with a sensible binding location</span></span>
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<pre style="margin: 0;">-<span id="LC721" class="line" lang="haskell"> <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">pats'</span><span class="p">,</span> <span class="n" style="color: #333;">payload'</span><span class="p">),</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC722" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bindLocalNamesFV</span> <span class="n" style="color: #333;">all_imp_var_names</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC723" class="line" lang="haskell"> <span class="n" style="color: #333;">bindLHsTyVarBndrs</span> <span class="n" style="color: #333;">doc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">inHsDocContext</span> <span class="n" style="color: #333;">doc</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC724" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">bndrs</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="LC725" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note: If we pass mb_cls instead of Nothing here,</span></span>
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<pre style="margin: 0;">-<span id="LC726" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bindLHsTyVarBndrs will use class variables for any names</span></span>
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<pre style="margin: 0;">-<span id="LC727" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the user meant to bring in scope here. This is an explicit</span></span>
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<pre style="margin: 0;">-<span id="LC728" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- forall, so we want fresh names, not class variables.</span></span>
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729
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<pre style="margin: 0;">-<span id="LC729" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Thus: always pass Nothing</span></span>
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<pre style="margin: 0;">-<span id="LC730" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">pats'</span><span class="p">,</span> <span class="n" style="color: #333;">pat_fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsTypeArgs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamPatCtx</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">-<span id="LC731" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">payload'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rn_payload</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">payload</span></span>
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<pre style="margin: 0;">-<span id="LC732" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC733" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Report unused binders on the LHS</span></span>
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<pre style="margin: 0;">-<span id="LC734" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unused type variables in family instances]</span></span>
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<pre style="margin: 0;">-<span id="LC735" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">groups</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">)]</span></span>
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736
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<pre style="margin: 0;">-<span id="LC736" class="line" lang="haskell"> <span class="n" style="color: #333;">groups</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equivClasses</span> <span class="n" style="color: #333;">cmpLocated</span> <span class="o" style="font-weight: 600;">$</span></span>
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737
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="haskell"> <span class="n" style="color: #333;">pat_kity_vars_with_dups</span></span>
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738
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<pre style="margin: 0;">-<span id="LC738" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">nms_dups</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;">lookupOccRn</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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739
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<pre style="margin: 0;">-<span id="LC739" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">:|</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</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;">groups</span> <span class="p">]</span></span>
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740
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<pre style="margin: 0;">-<span id="LC740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Add to the used variables</span></span>
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741
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<pre style="margin: 0;">-<span id="LC741" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a) any variables that appear *more than once* on the LHS</span></span>
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<pre style="margin: 0;">-<span id="LC742" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. F a Int a = Bool</span></span>
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743
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<pre style="margin: 0;">-<span id="LC743" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- b) for associated instances, the variables</span></span>
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744
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<pre style="margin: 0;">-<span id="LC744" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of the instance decl. See</span></span>
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<pre style="margin: 0;">-<span id="LC745" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Unused type variables in family instances]</span></span>
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<pre style="margin: 0;">-<span id="LC746" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nms_used</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendNameSetList</span> <span class="n" style="color: #333;">rhs_fvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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747
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<pre style="margin: 0;">-<span id="LC747" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">nms_dups</span></span>
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748
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<pre style="margin: 0;">-<span id="LC748" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">atfi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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749
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<pre style="margin: 0;">-<span id="LC749" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <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="LC750" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamDeflt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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751
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<pre style="margin: 0;">-<span id="LC751" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInst</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">inst_tvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">inst_tvs</span></span>
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752
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<pre style="margin: 0;">-<span id="LC752" class="line" lang="haskell"> <span class="n" style="color: #333;">all_nms</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">all_imp_var_names</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">bndrs'</span></span>
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<pre style="margin: 0;">-<span id="LC753" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">warnUnusedTypePatterns</span> <span class="n" style="color: #333;">all_nms</span> <span class="n" style="color: #333;">nms_used</span></span>
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<pre style="margin: 0;">-<span id="LC754" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC755" 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;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">pats'</span><span class="p">,</span> <span class="n" style="color: #333;">payload'</span><span class="p">),</span> <span class="n" style="color: #333;">rhs_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">pat_fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC756" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC757" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvs</span> <span class="p">`</span><span class="n" style="color: #333;">addOneFV</span><span class="p">`</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">tycon'</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"> <span class="n" style="color: #333;">pat_kity_vars_with_dups</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">rhs_kvars</span></span>
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="n" style="color: #333;">mb_cls</span> <span class="n" style="color: #333;">all_imp_vars</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">all_imp_var_names</span> <span class="o" style="font-weight: 600;">-></span></span>
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720
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"> <span class="n" style="color: #333;">bindLHsTyVarBndrs</span> <span class="n" style="color: #333;">doc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">inHsDocContext</span> <span class="n" style="color: #333;">doc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">bndrs</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="LC722" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note: If we pass mb_cls instead of Nothing here,</span></span>
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bindLHsTyVarBndrs will use class variables for any names</span></span>
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<pre style="margin: 0;">+<span id="LC724" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the user meant to bring in scope here. This is an explicit</span></span>
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- forall, so we want fresh names, not class variables.</span></span>
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<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Thus: always pass Nothing</span></span>
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727
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<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">pats'</span><span class="p">,</span> <span class="n" style="color: #333;">pat_fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsTypeArgs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamPatCtx</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">payload'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rn_payload</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">payload</span></span>
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729
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<pre style="margin: 0;">+<span id="LC729" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Report unused binders on the LHS</span></span>
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731
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<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unused type variables in family instances]</span></span>
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732
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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">groups</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">)]</span></span>
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733
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"> <span class="n" style="color: #333;">groups</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equivClasses</span> <span class="n" style="color: #333;">cmpLocated</span> <span class="o" style="font-weight: 600;">$</span></span>
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734
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"> <span class="n" style="color: #333;">pat_kity_vars_with_dups</span></span>
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735
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">nms_dups</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;">lookupOccRn</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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736
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">:|</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</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;">groups</span> <span class="p">]</span></span>
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737
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Add to the used variables</span></span>
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738
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a) any variables that appear *more than once* on the LHS</span></span>
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739
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. F a Int a = Bool</span></span>
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740
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- b) for associated instances, the variables</span></span>
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741
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<pre style="margin: 0;">+<span id="LC741" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of the instance decl. See</span></span>
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742
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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Unused type variables in family instances]</span></span>
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743
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nms_used</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendNameSetList</span> <span class="n" style="color: #333;">rhs_fvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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744
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">nms_dups</span></span>
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">atfi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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746
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<pre style="margin: 0;">+<span id="LC746" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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747
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<pre style="margin: 0;">+<span id="LC747" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamDeflt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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748
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<pre style="margin: 0;">+<span id="LC748" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInst</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">inst_tvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">inst_tvs</span></span>
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749
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<pre style="margin: 0;">+<span id="LC749" class="line" lang="haskell"> <span class="n" style="color: #333;">all_nms</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">all_imp_var_names</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">bndrs'</span></span>
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750
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<pre style="margin: 0;">+<span id="LC750" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">warnUnusedTypePatterns</span> <span class="n" style="color: #333;">all_nms</span> <span class="n" style="color: #333;">nms_used</span></span>
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751
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<pre style="margin: 0;">+<span id="LC751" class="line" lang="haskell"></span>
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752
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">pat_fvs</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">addOneFV</span><span class="p">`</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">tycon'</span></span>
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<pre style="margin: 0;"> <span id="LC753" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type instance => use, hence addOneFV</span></span>
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<pre style="margin: 0;"> <span id="LC754" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">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;">all_imp_var_names</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Wildcards in family instances]</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">@@ -765,7 +760,7 @@ rnFamInstEqn doc atfi rhs_kvars</td>
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<pre style="margin: 0;"> <span id="LC760" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">feqn_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pats'</span></span>
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<pre style="margin: 0;"> <span id="LC761" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">feqn_fixity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fixity</span></span>
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762
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<pre style="margin: 0;"> <span id="LC762" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">feqn_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">payload'</span> <span class="p">}</span> <span class="p">},</span></span>
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<pre style="margin: 0;">-<span id="LC768" class="line" lang="haskell"> <span class="n" style="color: #333;">all_fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"> <span class="n" style="color: #333;">all_fvs</span><span class="p">)</span> <span class="p">}</span><span class="idiff left"> </span><span class="p"><span class="idiff right">}</span></span></span>
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764
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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyFamInstDecl</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInfo</span></span>
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyFamInstDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</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">@@ -2116,12 +2111,12 @@ rnConDecl decl@(ConDeclGADT { con_names = names</td>
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2116
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<pre style="margin: 0;"> <span id="LC2111" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #14808.</span></span>
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<pre style="margin: 0;"> <span id="LC2112" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="n" style="color: #333;">explicit_forall</span></span>
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2118
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2113
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<pre style="margin: 0;"> <span id="LC2113" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTvBndrs</span> <span class="n" style="color: #333;">explicit_tkvs</span></span>
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<pre style="margin: 0;">-<span id="LC2119" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTysRdrTyVars<span class="idiff left right">Dups</span></span> <span class="p">(</span><span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">[</span><span class="n" style="color: #333;">res_ty</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC2114" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTysRdrTyVars</span> <span class="p">(</span><span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">[</span><span class="n" style="color: #333;">res_ty</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC2115" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2116" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ConDeclCtx</span> <span class="n" style="color: #333;">new_names</span></span>
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2122
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<pre style="margin: 0;"> <span id="LC2117" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">inHsDocContext</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2118" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2124" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">implicit_tkvs</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC2119" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nothing</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">implicit_tkvs</span> <span class="o" style="font-weight: 600;">-></span></span>
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2125
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2120
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<pre style="margin: 0;"> <span id="LC2120" class="line" lang="haskell"> <span class="n" style="color: #333;">bindLHsTyVarBndrs</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">mb_ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">explicit_tkvs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">explicit_tkvs</span> <span class="o" style="font-weight: 600;">-></span></span>
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2126
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2121
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<pre style="margin: 0;"> <span id="LC2121" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">new_cxt</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnMbContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">mcxt</span></span>
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2127
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2122
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<pre style="margin: 0;"> <span id="LC2122" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_args</span><span class="p">,</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnConDeclDetails</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="p">(</span><span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">new_names</span><span class="p">))</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">args</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/285f281743865ea1657cd734527c7c3fc64bd0f7#9ea832ccdb4b5f7508a1efd6caedeafa16b269e7"><strong>compiler/GHC/Tc/Gen/Splice.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1431" 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="1431" 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">@@ -1431,7 +1431,7 @@ reifyInstances th_nm th_tys</td>
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1431
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1431
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<pre style="margin: 0;"> <span id="LC1431" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- must error before proceeding to typecheck the</span></span>
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1432
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1432
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<pre style="margin: 0;"> <span id="LC1432" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- renamed type, as that will result in GHC</span></span>
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1433
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1433
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<pre style="margin: 0;"> <span id="LC1433" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- internal errors (#13837).</span></span>
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1434
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<pre style="margin: 0;">-<span id="LC1434" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">bindLRdrNames</span></span> <span class="n" style="color: #333;">tv_rdrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">tv_names</span> <span class="o" style="font-weight: 600;">-></span></span>
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1434
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<pre style="margin: 0;">+<span id="LC1434" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">rnImplicitBndrs</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nothing</span></span> <span class="n" style="color: #333;">tv_rdrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">tv_names</span> <span class="o" style="font-weight: 600;">-></span></span>
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1435
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1435
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<pre style="margin: 0;"> <span id="LC1435" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">rn_ty</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsType</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">rdr_ty</span></span>
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1436
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1436
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<pre style="margin: 0;"> <span id="LC1436" 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;">tv_names</span><span class="p">,</span> <span class="n" style="color: #333;">rn_ty</span><span class="p">),</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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1437
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1437
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<pre style="margin: 0;"> <span id="LC1437" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/285f281743865ea1657cd734527c7c3fc64bd0f7#bab8232ea328f0db8fa1136f6664e6abc5f20e3f"><strong>testsuite/tests/indexed-types/should_compile/ExplicitForAllFams2.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -5,8 +5,8 @@ ExplicitForAllFams2.hs:34:10: warning: [-Wunused-type-patterns]</td>
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5
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5
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">ExplicitForAllFams2.hs:35:10: warning: [-Wunused-type-patterns]</span>
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6
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6
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘a’</span>
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7
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7
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"></span>
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8
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">ExplicitForAllFams2.hs:38:<span class="idiff left right">7</span>: warning: [-Wunused-type-patterns]</span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">ExplicitForAllFams2.hs:38:<span class="idiff left right">3</span>: warning: [-Wunused-type-patterns]</span>
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9
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9
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘t’</span>
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10
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10
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext">ExplicitForAllFams2.hs:39:<span class="idiff left right">6</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">ExplicitForAllFams2.hs:39:<span class="idiff left right">3</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘a’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/285f281743865ea1657cd734527c7c3fc64bd0f7#416260ec88bfaa6b764cd4b71a7e18a526cfd50f"><strong>testsuite/tests/indexed-types/should_compile/T16356_Compile2.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T16356_Compile2.hs:10:<span class="idiff left right">12</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16356_Compile2.hs:10:<span class="idiff left right">3</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘j’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">T16356_Compile2.hs:10:<span class="idiff left right">17</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">T16356_Compile2.hs:10:<span class="idiff left right">3</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘a’</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext">T16356_Compile2.hs:13:15: warning: [-Wunused-type-patterns]</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/285f281743865ea1657cd734527c7c3fc64bd0f7#8e1bdb9c5132b51caa1a3e10f9ae595b613cbd8a"><strong>testsuite/tests/indexed-types/should_compile/T16632.stderr</strong></a>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T16632.hs:5:<span class="idiff left right">22</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16632.hs:5:<span class="idiff left right">1</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘b’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> |</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">5 | type instance F Char b Int = ()</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> | <span class="idiff left right"> </span>^</span></pre>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> | <span class="idiff left right">^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^</span>^</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/285f281743865ea1657cd734527c7c3fc64bd0f7#22dbe064cc54965b36bb690263e0ab89828159d9"><strong>testsuite/tests/indexed-types/should_compile/UnusedTyVarWarnings.stderr</strong></a>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">UnusedTyVarWarnings.hs:8:<span class="idiff left right">7</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">UnusedTyVarWarnings.hs:8:<span class="idiff left right">3</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘b’</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">UnusedTyVarWarnings.hs:11:<span class="idiff left right">20</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">UnusedTyVarWarnings.hs:11:<span class="idiff left right">1</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘b’</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">UnusedTyVarWarnings.hs:27:<span class="idiff left right">5</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">UnusedTyVarWarnings.hs:27:<span class="idiff left right">3</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘a’</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext">UnusedTyVarWarnings.hs:33:1<span class="idiff left right">9</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">UnusedTyVarWarnings.hs:33:1: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘b’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/285f281743865ea1657cd734527c7c3fc64bd0f7#1bdaccfcf93b6c37f86c5dafb4ce9d3e874cbd38"><strong>testsuite/tests/indexed-types/should_compile/UnusedTyVarWarningsNamedWCs.stderr</strong></a>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">UnusedTyVarWarningsNamedWCs.hs:8:<span class="idiff left right">7</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">UnusedTyVarWarningsNamedWCs.hs:8:<span class="idiff left right">3</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘b’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">UnusedTyVarWarningsNamedWCs.hs:11:<span class="idiff left right">20</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">UnusedTyVarWarningsNamedWCs.hs:11:<span class="idiff left right">1</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘b’</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">UnusedTyVarWarningsNamedWCs.hs:27:<span class="idiff left right">5</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">UnusedTyVarWarningsNamedWCs.hs:27:<span class="idiff left right">3</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘a’</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext">UnusedTyVarWarningsNamedWCs.hs:33:1<span class="idiff left right">9</span>: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">UnusedTyVarWarningsNamedWCs.hs:33:1: warning: [-Wunused-type-patterns]</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> Defined but not used on the right hand side: type variable ‘b’</span></pre>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T17008a.hs:11:<span class="idiff left right">21</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T17008a.hs:11:<span class="idiff left right">3</span>: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Type variable ‘a1’ is mentioned in the RHS,</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> but not bound on the LHS of the family instance</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> The real LHS (expanding synonyms) is: F @a2 x</span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T7536.hs:8:<span class="idiff left right">2</span>1: error:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T7536.hs:8:1: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Type variable ‘a’ is mentioned in the RHS,</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> but not bound on the LHS of the family instance</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> The real LHS (expanding synonyms) is: TF Int</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/285f281743865ea1657cd734527c7c3fc64bd0f7#8002e66eed40ca81c468dbef70930ddc68b86514"><strong>testsuite/tests/polykinds/T11203.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T11203.hs:7:<span class="idiff left right">24</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T11203.hs:7:<span class="idiff left right">1</span>: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Different names for the same type variable: ‘k1’ and ‘k2’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> • In the data declaration for ‘Q’</span></pre>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T11821a.hs:4:<span class="idiff left right">3</span>1: error:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T11821a.hs:4:1: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Different names for the same type variable: ‘k1’ and ‘k2’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> • In the type declaration for ‘SameKind’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/285f281743865ea1657cd734527c7c3fc64bd0f7#c73838e6c9bd0f720515ce80dcea91669cf91077"><strong>testsuite/tests/typecheck/should_fail/T17566b.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T17566b.hs:7:<span class="idiff left right">17</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T17566b.hs:7:<span class="idiff left right">3</span>: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Different names for the same type variable: ‘k1’ and ‘k2’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> • In the class declaration for ‘C’</span></pre>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T17566c.hs:11:<span class="idiff left right">2</span>3: error:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T17566c.hs:11:3: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Different names for the same type variable:</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘k’ bound at T17566c.hs:10:<span class="idiff left right">17</span></span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> ‘k’ bound at T17566c.hs:11:<span class="idiff left right">2</span>3</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘k’ bound at T17566c.hs:10:<span class="idiff left right">3</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> ‘k’ bound at T17566c.hs:11:3</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • In the class declaration for ‘C2’</span></pre>
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