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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7">01c948eb</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-30T07:11:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up the inferred type variable restriction
This patch primarily:
* Documents `checkInferredVars` (previously called
`check_inferred_vars`) more carefully. This is the
function which throws an error message if a user quantifies an
inferred type variable in a place where specificity cannot be
observed. See `Note [Unobservably inferred type variables]` in
`GHC.Rename.HsType`.
Note that I now invoke `checkInferredVars` _alongside_
`rnHsSigType`, `rnHsWcSigType`, etc. rather than doing so _inside_
of these functions. This results in slightly more call sites for
`checkInferredVars`, but it makes it much easier to enumerate the
spots where the inferred type variable restriction comes into
effect.
* Removes the inferred type variable restriction for default method
type signatures, per the discussion in #18432. As a result, this
patch fixes #18432.
Along the way, I performed some various cleanup:
* I moved `no_nested_foralls_contexts_err` into `GHC.Rename.Utils`
(under the new name `noNestedForallsContextsErr`), since it now
needs to be invoked from multiple modules. I also added a helper
function `addNoNestedForallsContextsErr` that throws the error
message after producing it, as this is a common idiom.
* In order to ensure that users cannot sneak inferred type variables
into `SPECIALISE instance` pragmas by way of nested `forall`s, I
now invoke `addNoNestedForallsContextsErr` when renaming
`SPECIALISE instance` pragmas, much like when we rename normal
instance declarations. (This probably should have originally been
done as a part of the fix for #18240, but this task was somehow
overlooked.) As a result, this patch fixes #18455 as a side effect.
</pre>
</li>
</ul>
<h4>14 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#018be522bc4813b147a1525e4f96a7a493207d96">
compiler/GHC/Hs/Type.hs
</a>
</li>
<li class="file-stats">
<a href="#af762064d779f7308dd415966c974f27d14f9943">
compiler/GHC/Rename/Bind.hs
</a>
</li>
<li class="file-stats">
<a href="#b47ece2bbb8303a5792c2fdc52394c8ed336e8a2">
compiler/GHC/Rename/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#892acbb198a9095c917740d3c1297b56df4e3b7e">
compiler/GHC/Rename/HsType.hs
</a>
</li>
<li class="file-stats">
<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
</a>
</li>
<li class="file-stats">
<a href="#cfa41b5649933e5b12f7796e9d49b9dd6a0bc59f">
compiler/GHC/Rename/Pat.hs
</a>
</li>
<li class="file-stats">
<a href="#939d24c1002dc322659c1f67c9f3d2db2ae31dd4">
compiler/GHC/Rename/Utils.hs
</a>
</li>
<li class="file-stats">
<a href="#b2bbbaa9afa7dee8f4b5ad5d88a54a403707596c">
<span class="new-file">
+
testsuite/tests/quantified-constraints/T18432.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#f1610e4f96b054482dbf49790fc6c1fa50e45ae2">
testsuite/tests/quantified-constraints/all.T
</a>
</li>
<li class="file-stats">
<a href="#f2f8be1d5db1924734332ee9da4296f24c549221">
testsuite/tests/typecheck/should_fail/ExplicitSpecificity4.hs
→
testsuite/tests/typecheck/should_compile/ExplicitSpecificity4.hs
</a>
</li>
<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
</a>
</li>
<li class="file-stats">
<a href="#81c6ad9f91d49f90a4af407219e2c58b6b5b8ed0">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/T18455.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#6c88bbe3db19f92289b0114b3fd4fd587211bd2c">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/T18455.stderr
</span>
</a>
</li>
<li class="file-stats">
<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">
testsuite/tests/typecheck/should_fail/all.T
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="018be522bc4813b147a1525e4f96a7a493207d96">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#018be522bc4813b147a1525e4f96a7a493207d96"><strong>compiler/GHC/Hs/Type.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1628" 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="1628" 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">@@ -1628,6 +1628,12 @@ instance types, which makes things like the instance above become illegal.</td>
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<pre style="margin: 0;"> <span id="LC1628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For the sake of consistency, we also disallow nested contexts, even though they</span></span>
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<td class="diff-line-num old_line" data-linenumber="1629" 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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<td class="diff-line-num new_line" data-linenumber="1629" 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="LC1629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">don't have the same strange interaction with ScopedTypeVariables.</span></span>
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<pre style="margin: 0;"> <span id="LC1630" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1631" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Just as we forbid nested `forall`s and contexts in normal instance</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1632" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">declarations, we also forbid them in SPECIALISE instance pragmas (#18455).</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1633" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Unlike normal instance declarations, ScopedTypeVariables don't have any impact</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1631" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1634" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on SPECIALISE instance pragmas, but we use the same validity checks for</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1631" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1635" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">SPECIALISE instance pragmas anyway to be consistent.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1636" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1636" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1637" 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="LC1638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Wrinkle: Derived instances</span></span>
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<td class="diff-line-num old_line" data-linenumber="1633" 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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<td class="diff-line-num new_line" data-linenumber="1639" 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="LC1639" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-----</span></span>
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<li id="af762064d779f7308dd415966c974f27d14f9943">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#af762064d779f7308dd415966c974f27d14f9943"><strong>compiler/GHC/Rename/Bind.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="43" 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="43" 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">@@ -43,7 +43,8 @@ import GHC.Rename.Fixity</td>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Utils</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">mapFvRn</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendTyVarEnvFVRn</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkDupRdrNames</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">warnUnusedLocalBinds</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkUnusedRecordWildcard</span></span>
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<pre style="margin: 0;">-<span id="LC46" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkDupAndShadowedNames</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bindLocalNamesFV</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkDupAndShadowedNames</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bindLocalNamesFV</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addNoNestedForallsContextsErr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkInferredVars</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Unit.Module</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="956" 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">@@ -955,7 +956,7 @@ renameSig _ (IdSig _ x)</td>
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955
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956
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<pre style="margin: 0;"> <span id="LC956" class="line" lang="haskell"><span class="n" style="color: #333;">renameSig</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypeSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">vs</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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956
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957
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<pre style="margin: 0;"> <span id="LC957" 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;">new_vs</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;">lookupSigOccRn</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span> <span class="n" style="color: #333;">vs</span></span>
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957
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958
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<pre style="margin: 0;"> <span id="LC958" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeSigCtx</span> <span class="p">(</span><span class="n" style="color: #333;">ppr_sig_bndrs</span> <span class="n" style="color: #333;">vs</span><span class="p">)</span></span>
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958
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<pre style="margin: 0;">-<span id="LC958" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_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;">rnHsSigWcType</span> <span class="n" style="color: #333;">doc</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;">ty</span></span>
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959
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_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;">rnHsSigWcType</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">ty</span></span>
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960
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<pre style="margin: 0;"> <span id="LC960" 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;">TypeSig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">new_vs</span> <span class="n" style="color: #333;">new_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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961
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<pre style="margin: 0;"> <span id="LC961" class="line" lang="haskell"></span>
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961
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962
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"><span class="n" style="color: #333;">renameSig</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClassOpSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">is_deflt</span> <span class="n" style="color: #333;">vs</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -963,20 +964,25 @@ renameSig ctxt sig@(ClassOpSig _ is_deflt vs ty)</td>
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963
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964
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<pre style="margin: 0;"> <span id="LC964" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">is_deflt</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">defaultSigs_on</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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965
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<pre style="margin: 0;"> <span id="LC965" class="line" lang="haskell"> <span class="n" style="color: #333;">addErr</span> <span class="p">(</span><span class="n" style="color: #333;">defaultSigErr</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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965
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966
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<pre style="margin: 0;"> <span id="LC966" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_v</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;">lookupSigOccRn</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span> <span class="n" style="color: #333;">vs</span></span>
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966
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<pre style="margin: 0;">-<span id="LC966" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_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;">rnHsSigType</span> <span class="n" style="color: #333;">ty_ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;"><span class="idiff left">inf_msg</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_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;">rnHsSigType</span> <span class="n" style="color: #333;">ty_ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">ty</span></span>
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967
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968
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<pre style="margin: 0;"> <span id="LC968" 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;">ClassOpSig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">is_deflt</span> <span class="n" style="color: #333;">new_v</span> <span class="n" style="color: #333;">new_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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968
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969
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<pre style="margin: 0;"> <span id="LC969" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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969
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970
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<pre style="margin: 0;"> <span id="LC970" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">v1</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;">vs</span></span>
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970
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971
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="haskell"> <span class="n" style="color: #333;">ty_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GenericCtx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a class method signature for"</span></span>
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971
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972
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<pre style="margin: 0;"> <span id="LC972" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">v1</span><span class="p">))</span></span>
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972
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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"> <span class="n" style="color: #333;">inf_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">is_deflt</span></span>
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973
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<pre style="margin: 0;">-<span id="LC973" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"A default type signature cannot contain inferred type variables"</span><span class="p">)</span></span>
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974
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<pre style="margin: 0;">-<span id="LC974" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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975
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973
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<pre style="margin: 0;"> <span id="LC973" class="line" lang="haskell"></span>
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976
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974
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<pre style="margin: 0;"> <span id="LC974" class="line" lang="haskell"><span class="n" style="color: #333;">renameSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SpecInstSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">src</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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977
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<pre style="margin: 0;">-<span id="LC977" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">new_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;">rnHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">SpecInstSigCtx</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">inf_msg</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC975" 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;">checkInferredVars</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">inf_msg</span> <span class="n" style="color: #333;">ty</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_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;">rnHsSigType</span> <span class="n" style="color: #333;">doc</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">ty</span></span>
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977
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check if there are any nested `forall`s or contexts, which are</span></span>
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978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- illegal in the type of an instance declaration (see</span></span>
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979
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [No nested foralls or contexts in instance types] in</span></span>
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Hs.Type).</span></span>
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981
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">addNoNestedForallsContextsErr</span> <span class="n" style="color: #333;">doc</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"SPECIALISE instance type"</span><span class="p">)</span></span>
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982
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<pre style="margin: 0;">+<span id="LC982" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getLHsInstDeclHead</span> <span class="n" style="color: #333;">new_ty</span><span class="p">)</span></span>
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978
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<pre style="margin: 0;"> <span id="LC983" 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;">SpecInstSig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">src</span> <span class="n" style="color: #333;">new_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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984
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<pre style="margin: 0;"> <span id="LC984" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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985
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<pre style="margin: 0;">+<span id="LC985" class="line" lang="haskell"> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SpecInstSigCtx</span></span>
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986
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<pre style="margin: 0;"> <span id="LC986" class="line" lang="haskell"> <span class="n" style="color: #333;">inf_msg</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;">text</span> <span class="s" style="color: #d14;">"Inferred type variables are not allowed"</span><span class="p">)</span></span>
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981
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987
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<pre style="margin: 0;"> <span id="LC987" class="line" lang="haskell"></span>
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988
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<pre style="margin: 0;"> <span id="LC988" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- {-# SPECIALISE #-} pragmas can refer to imported Ids</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -993,7 +999,7 @@ renameSig ctxt sig@(SpecSig _ v tys inl)</td>
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993
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999
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<pre style="margin: 0;"> <span id="LC999" class="line" lang="haskell"> <span class="n" style="color: #333;">ty_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GenericCtx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a SPECIALISE signature for"</span></span>
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994
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1000
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<pre style="margin: 0;"> <span id="LC1000" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">v</span><span class="p">))</span></span>
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995
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1001
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<pre style="margin: 0;"> <span id="LC1001" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one</span> <span class="p">(</span><span class="n" style="color: #333;">tys</span><span class="p">,</span><span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span></span>
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996
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<pre style="margin: 0;">-<span id="LC996" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">new_ty</span><span class="p">,</span> <span class="n" style="color: #333;">fvs_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ty_ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</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;">ty</span></span>
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1002
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">new_ty</span><span class="p">,</span> <span class="n" style="color: #333;">fvs_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ty_ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">ty</span></span>
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1003
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">new_ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">tys</span><span class="p">,</span> <span class="n" style="color: #333;">fvs_ty</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</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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1004
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<pre style="margin: 0;"> <span id="LC1004" class="line" lang="haskell"></span>
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1005
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<pre style="margin: 0;"> <span id="LC1005" class="line" lang="haskell"><span class="n" style="color: #333;">renameSig</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InlineSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">v</span> <span class="n" style="color: #333;">s</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1016" 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">@@ -1010,7 +1016,7 @@ renameSig ctxt sig@(MinimalSig _ s (L l bf))</td>
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1010
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"></span>
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1011
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"><span class="n" style="color: #333;">renameSig</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">vs</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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1012
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1018
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<pre style="margin: 0;"> <span id="LC1018" 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;">new_vs</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;">lookupSigOccRn</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span> <span class="n" style="color: #333;">vs</span></span>
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1013
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<pre style="margin: 0;">-<span id="LC1013" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ty_ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</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;">ty</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ty_ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">ty</span></span>
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1014
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynSig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">new_vs</span> <span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1022
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell"> <span class="n" style="color: #333;">ty_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GenericCtx</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a pattern synonym signature for"</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#b47ece2bbb8303a5792c2fdc52394c8ed336e8a2"><strong>compiler/GHC/Rename/Expr.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">@@ -317,7 +317,7 @@ rnExpr (RecordUpd { rupd_expr = expr, rupd_flds = rbinds })</td>
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<pre style="margin: 0;"> <span id="LC317" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fvExpr</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">fvRbinds</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC318" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC319" class="line" lang="haskell"><span class="n" style="color: #333;">rnExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprWithTySig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">pty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">pty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvTy</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">ExprWithTySigCtx</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;">pty</span></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">pty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvTy</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">ExprWithTySigCtx</span> <span class="n" style="color: #333;">pty</span></span>
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<pre style="margin: 0;"> <span id="LC321" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">fvExpr</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bindSigTyVarsFV</span> <span class="p">(</span><span class="n" style="color: #333;">hsWcScopedTvs</span> <span class="n" style="color: #333;">pty'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC322" class="line" lang="haskell"> <span class="n" style="color: #333;">rnLExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC323" 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;">ExprWithTySig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">expr'</span> <span class="n" style="color: #333;">pty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvExpr</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">fvTy</span><span class="p">)</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#892acbb198a9095c917740d3c1297b56df4e3b7e"><strong>compiler/GHC/Rename/HsType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -39,7 +39,6 @@ import GHC.Prelude</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Rename</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Splice</span><span class="p">(</span> <span class="n" style="color: #333;">rnSpliceType</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Doc</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">rnLHsDoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rnMbLHsDoc</span> <span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -68,7 +67,7 @@ import GHC.Data.FastString</td>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">nubBy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">partition</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">find</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">nubBy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">partition</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">unless</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">when</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</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">@@ -124,19 +123,16 @@ data HsSigWcTypeScoping</td>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- "GHC.Hs.Type".</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigWcType</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="LC127" 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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<pre style="margin: 0;">-<span id="LC128" 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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<pre style="margin: 0;">-<span id="LC129" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- manually written inferred variables.</span></span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;"> <span id="LC127" 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="kt" style="color: #458; font-weight: 600;">LHsSigWcType</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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<pre style="margin: 0;">-<span id="LC132" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigWcType</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;"><span class="idiff left">inf_err</span></span><span class="idiff right"> </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="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}})</span></span>
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<pre style="margin: 0;">-<span id="LC133" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rn_hs_sig_wc_type</span> <span class="kt" style="color: #458; font-weight: 600;">BindUnlessForall</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;"><span class="idiff left">inf_err</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nwcs</span> <span class="n" style="color: #333;">imp_tvs</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigWcType</span> <span class="n" style="color: #333;">doc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="p">{</span> <span class="n" style="color: #333;">hswc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}})</span></span>
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rn_hs_sig_wc_type</span> <span class="kt" style="color: #458; font-weight: 600;">BindUnlessForall</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nwcs</span> <span class="n" style="color: #333;">imp_tvs</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ib_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">imp_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">body</span> <span class="p">}</span></span>
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135
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131
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"> <span class="n" style="color: #333;">wc_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;">nwcs</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;">ib_ty</span> <span class="p">}</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">wc_ty</span><span class="p">,</span> <span class="n" style="color: #333;">emptyFVs</span><span class="p">)</span></span>
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137
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133
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"></span>
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138
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsPatSigType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsSigWcTypeScoping</span></span>
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139
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</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">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">SDoc</span></span></span>
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"> <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="LC136" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsPatSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;"> <span id="LC137" 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;">HsPatSigType</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;">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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138
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<pre style="margin: 0;"> <span id="LC138" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -147,10 +143,10 @@ rnHsPatSigType :: HsSigWcTypeScoping</td>
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Wildcards are allowed</span></span>
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<pre style="margin: 0;"> <span id="LC144" 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="LC145" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Pattern signature binders and scoping] in GHC.Hs.Type</span></span>
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<pre style="margin: 0;">-<span id="LC150" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsPatSigType</span> <span class="n" style="color: #333;">scoping</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left">inf_err</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">sig_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsPatSigType</span> <span class="n" style="color: #333;">scoping</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">sig_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ty_sig_okay</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ScopedTypeVariables</span></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkErr</span> <span class="n" style="color: #333;">ty_sig_okay</span> <span class="p">(</span><span class="n" style="color: #333;">unexpectedPatSigTypeErr</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="haskell"> <span class="p">;</span> <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;">ctx</span> <span class="n" style="color: #333;"><span class="idiff left">inf_err</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">hsPatSigType</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rn_hs_sig_wc_type</span> <span class="n" style="color: #333;">scoping</span> <span class="n" style="color: #333;">ctx</span> <span class="p">(</span><span class="n" style="color: #333;">hsPatSigType</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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154
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nwcs</span> <span class="n" style="color: #333;">imp_tvs</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"> <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;">sig_names</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsPSRn</span> <span class="p">{</span> <span class="n" style="color: #333;">hsps_nwcs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nwcs</span><span class="p">,</span> <span class="n" style="color: #333;">hsps_imp_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">imp_tvs</span> <span class="p">}</span></span>
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156
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"> <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;">HsPS</span> <span class="p">{</span> <span class="n" style="color: #333;">hsps_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_names</span><span class="p">,</span> <span class="n" style="color: #333;">hsps_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">body</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -158,16 +154,15 @@ rnHsPatSigType scoping ctx inf_err sig_ty thing_inside</td>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The workhorse for rnHsSigWcType and rnHsPatSigType.</span></span>
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"><span class="n" style="color: #333;">rn_hs_sig_wc_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsSigWcTypeScoping</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</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">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">SDoc</span></span></span>
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"><span class="n" style="color: #333;">rn_hs_sig_wc_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsSigWcTypeScoping</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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162
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;"> <span id="LC159" 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="c1" style="color: #998; font-style: italic;">-- Wildcard names</span></span>
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164
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<pre style="margin: 0;"> <span id="LC160" 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="c1" style="color: #998; font-style: italic;">-- Implicitly bound type variable names</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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166
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<pre style="margin: 0;"> <span id="LC162" 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="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="LC168" 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="LC169" 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="LC170" 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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<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;">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;">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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<pre style="margin: 0;"> <span id="LC166" 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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167
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<pre style="margin: 0;"> <span id="LC167" 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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168
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<pre style="margin: 0;"> <span id="LC168" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -318,17 +313,13 @@ of the HsWildCardBndrs structure, and we are done.</td>
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC314" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigType</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="LC315" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span></span>
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<pre style="margin: 0;">-<span id="LC321" 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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<pre style="margin: 0;">-<span id="LC322" 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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<pre style="margin: 0;">-<span id="LC323" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- manually written inferred variables.</span></span>
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<pre style="margin: 0;"> <span id="LC316" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;"> <span id="LC317" 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="kt" style="color: #458; font-weight: 600;">LHsSigType</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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<pre style="margin: 0;"> <span id="LC318" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used for source-language type signatures</span></span>
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<pre style="margin: 0;"> <span id="LC319" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that cannot have wildcards</span></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">level</span> <span class="n" style="color: #333;"><span class="idiff left">inf_err</span></span><span class="idiff right"> </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_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">level</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_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC321" 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;">traceRn</span> <span class="s" style="color: #d14;">"rnHsSigType"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</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="LC322" class="line" lang="haskell"> <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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<pre style="margin: 0;">-<span id="LC331" 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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<pre style="margin: 0;"> <span id="LC323" 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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<pre style="margin: 0;"> <span id="LC324" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">filterInScope</span> <span class="n" style="color: #333;">rdr_env</span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -415,26 +406,6 @@ type signature, since the type signature implicitly carries their binding</td>
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<pre style="margin: 0;"> <span id="LC406" 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="LC407" 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="LC408" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC418" 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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<pre style="margin: 0;">-<span id="LC419" 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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<pre style="margin: 0;">-<span id="LC420" 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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<pre style="margin: 0;">-<span id="LC421" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- manually written inferred variables.</span></span>
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<pre style="margin: 0;">-<span id="LC422" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;">-<span id="LC423" 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="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC424" class="line" lang="haskell"><span class="n" style="color: #333;">check_inferred_vars</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC425" class="line" lang="haskell"><span class="n" style="color: #333;">check_inferred_vars</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">msg</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC426" class="line" lang="haskell"> <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;">forallty_bndrs</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC427" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">find</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;">InferredSpec</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">hsTyVarBndrFlag</span><span class="p">)</span> <span class="n" style="color: #333;">bndrs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC428" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC429" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addErr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">msg</span></span>
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<pre style="margin: 0;">-<span id="LC430" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC431" class="line" lang="haskell"> <span class="n" style="color: #333;">forallty_bndrs</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</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="LC432" class="line" lang="haskell"> <span class="n" style="color: #333;">forallty_bndrs</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 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="LC433" 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;">forallty_bndrs</span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;">-<span id="LC434" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_tele</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsForAllInvis</span> <span class="p">{</span> <span class="n" style="color: #333;">hsf_invis_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span> <span class="p">}}</span></span>
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<pre style="margin: 0;">-<span id="LC435" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;">-<span id="LC436" 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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<pre style="margin: 0;">-<span id="LC437" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- ******************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC410" 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="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> LHsType and HsType</span></span>
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<li id="7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a"><strong>compiler/GHC/Rename/Module.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">@@ -34,7 +34,8 @@ import GHC.Rename.Utils ( HsDocContext(..), mapFvRn, bindLocalNames</td>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkDupRdrNames</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bindLocalNamesFV</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkShadowedRdrNames</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">warnUnusedTypePatterns</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendTyVarEnvFVRn</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newLocalBndrsRn</span></span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">withHsDocContext</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">withHsDocContext</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">noNestedForallsContextsErr</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addNoNestedForallsContextsErr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkInferredVars</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Unbound</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mkUnboundName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">notInScopeErr</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Names</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Rename.Doc</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">rnHsDoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rnMbLHsDoc</span> <span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -65,7 +66,6 @@ import GHC.Data.List.SetOps ( findDupsEq, removeDups, equivClasses )</td>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Graph.Directed</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">SCC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">flattenSCC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">flattenSCCs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Node</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="LC67" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">stronglyConnCompFromEdgedVerticesUniq</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Set</span></span>
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">whenIsJust</span> <span class="p">)</span></span>
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69
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69
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.OrdList</span></span>
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70
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70
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>
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71
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71
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="371" 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="371" 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">@@ -371,7 +371,7 @@ rnHsForeignDecl :: ForeignDecl GhcPs -> RnM (ForeignDecl GhcRn, FreeVars)</td>
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371
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371
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<pre style="margin: 0;"> <span id="LC371" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsForeignDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignImport</span> <span class="p">{</span> <span class="n" style="color: #333;">fd_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">fd_sig_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">fd_fi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">spec</span> <span class="p">})</span></span>
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372
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372
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<pre style="margin: 0;"> <span id="LC372" 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;">topEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HscEnv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTopEnv</span></span>
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373
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373
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">name'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupLocatedTopBndrRn</span> <span class="n" style="color: #333;">name</span></span>
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374
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignDeclCtx</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</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;">ty</span></span>
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374
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignDeclCtx</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">ty</span></span>
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375
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"></span>
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376
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Mark any PackageTarget style imports as coming from the current package</span></span>
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">unitId</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">homeUnit</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hsc_dflags</span> <span class="n" style="color: #333;">topEnv</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">@@ -383,7 +383,7 @@ rnHsForeignDecl (ForeignImport { fd_name = name, fd_sig_ty = ty, fd_fi = spec })</td>
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383
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383
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"></span>
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384
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384
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsForeignDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignExport</span> <span class="p">{</span> <span class="n" style="color: #333;">fd_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">fd_sig_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">fd_fe</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">spec</span> <span class="p">})</span></span>
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385
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385
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">name'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupLocatedOccRn</span> <span class="n" style="color: #333;">name</span></span>
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386
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<pre style="margin: 0;">-<span id="LC386" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignDeclCtx</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</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;">ty</span></span>
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386
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignDeclCtx</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">ty</span></span>
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387
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387
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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;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignExport</span> <span class="p">{</span> <span class="n" style="color: #333;">fd_e_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span></span>
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fd_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">name'</span><span class="p">,</span> <span class="n" style="color: #333;">fd_sig_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty'</span></span>
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389
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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;">fd_fe</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">spec</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -602,13 +602,14 @@ rnClsInstDecl (ClsInstDecl { cid_poly_ty = inst_ty, cid_binds = mbinds</td>
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602
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602
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cid_sigs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uprags</span><span class="p">,</span> <span class="n" style="color: #333;">cid_tyfam_insts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ats</span></span>
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603
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603
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cid_overlap_mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">oflag</span></span>
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604
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604
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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cid_datafam_insts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adts</span> <span class="p">})</span></span>
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605
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<pre style="margin: 0;">-<span id="LC605" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">inst_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">inst_fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">inst_ty</span></span>
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605
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<pre style="margin: 0;">+<span id="LC605" 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;">checkInferredVars</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">inst_ty</span></span>
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606
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">inst_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">inst_fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">inst_ty</span></span>
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606
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607
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ktv_names</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">head_ty'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitLHsInstDeclTy</span> <span class="n" style="color: #333;">inst_ty'</span></span>
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608
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check if there are any nested `forall`s or contexts, which are</span></span>
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608
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609
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- illegal in the type of an instance declaration (see</span></span>
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609
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610
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<pre style="margin: 0;"> <span id="LC610" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [No nested foralls or contexts in instance types] in</span></span>
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610
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611
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Hs.Type)...</span></span>
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<pre style="margin: 0;">-<span id="LC611" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_nested_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">no<span class="idiff left right">_nested_foralls_contexts_e</span>rr</span></span>
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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_nested_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">no<span class="idiff left right">NestedForallsContextsE</span>rr</span></span>
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612
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613
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<pre style="margin: 0;"> <span id="LC613" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Instance head"</span><span class="p">)</span> <span class="n" style="color: #333;">head_ty'</span></span>
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613
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614
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<pre style="margin: 0;"> <span id="LC614" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ...then check if the instance head is actually headed by a</span></span>
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615
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<pre style="margin: 0;"> <span id="LC615" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- class type constructor...</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="629" 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">@@ -628,17 +629,10 @@ rnClsInstDecl (ClsInstDecl { cid_poly_ty = inst_ty, cid_binds = mbinds</td>
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628
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629
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with an error message if there isn't one. To avoid excessive</span></span>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- amounts of error messages, we will only report one of the errors</span></span>
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- from mb_nested_msg or eith_cls at a time.</span></span>
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<pre style="margin: 0;">-<span id="LC631" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">maybe</span> <span class="n" style="color: #333;">eith_cls</span> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="n" style="color: #333;">mb_nested_msg</span> <span class="kr" style="font-weight: 600;">of</span></span>
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632
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<pre style="margin: 0;">-<span id="LC632" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">cls</span></span>
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<pre style="margin: 0;">-<span id="LC633" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC634" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The instance is malformed. We'd still like</span></span>
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<pre style="margin: 0;">-<span id="LC635" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to make *some* progress (rather than failing outright), so</span></span>
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<pre style="margin: 0;">-<span id="LC636" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we report an error and continue for as long as we can.</span></span>
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<pre style="margin: 0;">-<span id="LC637" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Importantly, this error should be thrown before we reach the</span></span>
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<pre style="margin: 0;">-<span id="LC638" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- typechecker, lest we encounter different errors that are</span></span>
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<pre style="margin: 0;">-<span id="LC639" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hopelessly confusing (such as the one in #16114).</span></span>
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640
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<pre style="margin: 0;">-<span id="LC640" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err_msg</span></span>
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641
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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkUnboundName</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcOccFS</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"<class>"</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">mb_nested_msg</span><span class="p">,</span> <span class="n" style="color: #333;">eith_cls</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">cls</span></span>
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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">err1</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;">bail_out</span> <span class="n" style="color: #333;">err1</span></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="n" style="color: #333;">err2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">bail_out</span> <span class="n" style="color: #333;">err2</span></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Rename the bindings</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The typechecker (not the renamer) checks that all</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="680" 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="674" 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">@@ -680,6 +674,15 @@ rnClsInstDecl (ClsInstDecl { cid_poly_ty = inst_ty, cid_binds = mbinds</td>
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680
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674
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<pre style="margin: 0;"> <span id="LC674" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GenericCtx</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"an instance declaration"</span></span>
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681
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<pre style="margin: 0;"> <span id="LC675" class="line" lang="haskell"> <span class="n" style="color: #333;">inf_err</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;">text</span> <span class="s" style="color: #d14;">"Inferred type variables are not allowed"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC676" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC677" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The instance is malformed. We'd still like to make *some* progress</span></span>
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<pre style="margin: 0;">+<span id="LC678" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (rather than failing outright), so we report an error and continue for</span></span>
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- as long as we can. Importantly, this error should be thrown before we</span></span>
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- reach the typechecker, lest we encounter different errors that are</span></span>
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hopelessly confusing (such as the one in #16114).</span></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"> <span class="n" style="color: #333;">bail_out</span> <span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err_msg</span></span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkUnboundName</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcOccFS</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"<class>"</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC686" class="line" lang="haskell"><span class="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="LC687" 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="LC688" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1010,22 +1013,22 @@ rnSrcDerivDecl :: DerivDecl GhcPs -> RnM (DerivDecl GhcRn, FreeVars)</td>
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1013
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"><span class="n" style="color: #333;">rnSrcDerivDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DerivDecl</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">mds</span> <span class="n" style="color: #333;">overlap</span><span class="p">)</span></span>
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1014
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<pre style="margin: 0;"> <span id="LC1014" 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;">standalone_deriv_ok</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">StandaloneDeriving</span></span>
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="n" style="color: #333;">standalone_deriv_ok</span> <span class="p">(</span><span class="n" style="color: #333;">addErr</span> <span class="n" style="color: #333;">standaloneDerivErr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1013" class="line" lang="haskell"> <span class="p">;</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">mds'</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty'</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fvs</span></span><span class="p"><span class="idiff right">)</span></span></span>
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1014
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<pre style="margin: 0;">-<span id="LC1014" class="line" lang="haskell"> <span class="idiff left"> </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">rnLDerivStrategy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mds</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">rnHsSigWcType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">inf_err</span></span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">checkInferredVars</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inf_err</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nowc_ty</span></span></span>
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"> <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mds'</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty'</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fvs</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="n" style="color: #333;"><span class="idiff">rnLDerivStrategy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mds</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">rnHsSigWcType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ctxt</span></span> <span class="n" style="color: #333;">ty</span></span>
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1018
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<pre style="margin: 0;"> <span id="LC1018" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check if there are any nested `forall`s or contexts, which are</span></span>
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- illegal in the type of an instance declaration (see</span></span>
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1017
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [No nested foralls or contexts in instance types] in</span></span>
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Hs.Type).</span></span>
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<pre style="margin: 0;">-<span id="LC1019" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">whenIsJust</span> <span class="p">(</span><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span></span>
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<pre style="margin: 0;">-<span id="LC1020" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Standalone-derived instance head"</span><span class="p">)</span></span>
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1021
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<pre style="margin: 0;">-<span id="LC1021" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getLHsInstDeclHead</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">dropWildCards</span> <span class="n" style="color: #333;">ty'</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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1022
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<pre style="margin: 0;">-<span id="LC1022" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err_msg</span></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">addNoNestedForallsContextsErr</span> <span class="n" style="color: #333;">ctxt</span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Standalone-derived instance head"</span><span class="p">)</span></span>
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1024
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<pre style="margin: 0;">+<span id="LC1024" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getLHsInstDeclHead</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">dropWildCards</span> <span class="n" style="color: #333;">ty'</span><span class="p">)</span></span>
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">warnNoDerivStrat</span> <span class="n" style="color: #333;">mds'</span> <span class="n" style="color: #333;">loc</span></span>
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1024
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1026
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<pre style="margin: 0;"> <span id="LC1026" 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;">DerivDecl</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">ty'</span> <span class="n" style="color: #333;">mds'</span> <span class="n" style="color: #333;">overlap</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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1025
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1027
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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1026
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1028
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<pre style="margin: 0;"> <span id="LC1028" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DerivDeclCtx</span></span>
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1027
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1029
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<pre style="margin: 0;"> <span id="LC1029" class="line" lang="haskell"> <span class="n" style="color: #333;">inf_err</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;">text</span> <span class="s" style="color: #d14;">"Inferred type variables are not allowed"</span><span class="p">)</span></span>
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1028
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<pre style="margin: 0;">-<span id="LC1028" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hswc_body</span> <span class="n" style="color: #333;">ty</span></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hsib_body</span> <span class="n" style="color: #333;">nowc_ty</span></span>
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1031
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<pre style="margin: 0;">+<span id="LC1031" class="line" lang="haskell"> <span class="n" style="color: #333;">nowc_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dropWildCards</span> <span class="n" style="color: #333;">ty</span></span>
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1032
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"></span>
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1030
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1033
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"><span class="n" style="color: #333;">standaloneDerivErr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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1031
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"><span class="n" style="color: #333;">standaloneDerivErr</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1094" 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">@@ -1091,7 +1094,7 @@ bindRuleTmVars doc tyvs vars names thing_inside</td>
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1091
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1094
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<pre style="margin: 0;"> <span id="LC1094" class="line" lang="haskell"></span>
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1092
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1095
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<pre style="margin: 0;"> <span id="LC1095" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleBndrSig</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="n" style="color: #333;">loc</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">bsig</span><span class="p">))</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">vars</span><span class="p">)</span></span>
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1093
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1096
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<pre style="margin: 0;"> <span id="LC1096" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">ns</span><span class="p">)</span> <span class="n" style="color: #333;">thing_inside</span></span>
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1094
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<pre style="margin: 0;">-<span id="LC1094" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rnHsPatSigType</span> <span class="n" style="color: #333;">bind_free_tvs</span> <span class="n" style="color: #333;">doc</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;">bsig</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">bsig'</span> <span class="o" style="font-weight: 600;">-></span></span>
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1097
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<pre style="margin: 0;">+<span id="LC1097" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rnHsPatSigType</span> <span class="n" style="color: #333;">bind_free_tvs</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">bsig</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">bsig'</span> <span class="o" style="font-weight: 600;">-></span></span>
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1095
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1098
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<pre style="margin: 0;"> <span id="LC1098" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">ns</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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1096
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1099
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<pre style="margin: 0;"> <span id="LC1099" class="line" lang="haskell"> <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;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleBndrSig</span> <span class="n" style="color: #333;">noExtField</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;">n</span><span class="p">)</span> <span class="n" style="color: #333;">bsig'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">vars'</span><span class="p">)</span></span>
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1097
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1100
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"></span>
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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="1434" 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 +1434,7 @@ rnStandaloneKindSignature tc_names (StandaloneKindSig _ v ki)</td>
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1431
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1434
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<pre style="margin: 0;"> <span id="LC1434" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="n" style="color: #333;">standalone_ki_sig_ok</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addErr</span> <span class="n" style="color: #333;">standaloneKiSigErr</span></span>
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1432
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1435
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<pre style="margin: 0;"> <span id="LC1435" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_v</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupSigCtxtOccRn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TopSigCtxt</span> <span class="n" style="color: #333;">tc_names</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"standalone kind signature"</span><span class="p">)</span> <span class="n" style="color: #333;">v</span></span>
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1433
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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="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSigCtx</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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1434
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<pre style="margin: 0;">-<span id="LC1434" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_ki</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;">rnHsSigType</span> <span class="n" style="color: #333;">doc</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</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;">ki</span></span>
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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;">new_ki</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;">rnHsSigType</span> <span class="n" style="color: #333;">doc</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="n" style="color: #333;">ki</span></span>
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1435
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1438
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<pre style="margin: 0;"> <span id="LC1438" 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;">StandaloneKindSig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">new_v</span> <span class="n" style="color: #333;">new_ki</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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1436
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1439
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<pre style="margin: 0;"> <span id="LC1439" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1440" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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">@@ -1841,15 +1844,14 @@ rnLHsDerivingClause doc</td>
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<pre style="margin: 0;"> <span id="LC1844" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_clause_pred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">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;">LHsSigType</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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<pre style="margin: 0;"> <span id="LC1845" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_clause_pred</span> <span class="n" style="color: #333;">pred_ty</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="LC1846" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inf_err</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;">text</span> <span class="s" style="color: #d14;">"Inferred type variables are not allowed"</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1844" class="line" lang="haskell"> <span class="n" style="color: #333;">ret</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">pred_ty'</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;">rnHsSigType</span> <span class="n" style="color: #333;">doc</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">pred_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1847" class="line" lang="haskell"> <span class="n" style="color: #333;">checkInferredVars</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">pred_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1848" class="line" lang="haskell"> <span class="n" style="color: #333;">ret</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">pred_ty'</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;">rnHsSigType</span> <span class="n" style="color: #333;">doc</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">pred_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1849" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check if there are any nested `forall`s, which are illegal in a</span></span>
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<pre style="margin: 0;"> <span id="LC1850" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `deriving` clause.</span></span>
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<pre style="margin: 0;"> <span id="LC1851" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [No nested foralls or contexts in instance types]</span></span>
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<pre style="margin: 0;"> <span id="LC1852" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (Wrinkle: Derived instances) in GHC.Hs.Type.</span></span>
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<pre style="margin: 0;">-<span id="LC1849" class="line" lang="haskell"> <span class="n" style="color: #333;">whenIsJust</span> <span class="p">(</span><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span></span>
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<pre style="margin: 0;">-<span id="LC1850" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Derived class type"</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1851" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getLHsInstDeclHead</span> <span class="n" style="color: #333;">pred_ty'</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC1852" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">err_msg</span></span>
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<pre style="margin: 0;">+<span id="LC1853" class="line" lang="haskell"> <span class="n" style="color: #333;">addNoNestedForallsContextsErr</span> <span class="n" style="color: #333;">doc</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Derived class type"</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1854" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getLHsInstDeclHead</span> <span class="n" style="color: #333;">pred_ty'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1855" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">ret</span></span>
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<pre style="margin: 0;"> <span id="LC1856" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1857" class="line" lang="haskell"><span class="n" style="color: #333;">rnLDerivStrategy</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span></span>
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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">@@ -1883,7 +1885,8 @@ rnLDerivStrategy doc mds thing_inside</td>
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<pre style="margin: 0;"> <span id="LC1885" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AnyclassStrategy</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">boring_case</span> <span class="kt" style="color: #458; font-weight: 600;">AnyclassStrategy</span></span>
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1884
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<pre style="margin: 0;"> <span id="LC1886" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NewtypeStrategy</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">boring_case</span> <span class="kt" style="color: #458; font-weight: 600;">NewtypeStrategy</span></span>
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1887
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<pre style="margin: 0;"> <span id="LC1887" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ViaStrategy</span> <span class="n" style="color: #333;">via_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC1886" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">(</span><span class="n" style="color: #333;">via_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;">rnHsSigType</span> <span class="n" style="color: #333;">doc</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">via_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1888" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">checkInferredVars</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">via_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1889" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">via_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;">rnHsSigType</span> <span class="n" style="color: #333;">doc</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">via_ty</span></span>
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1890
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<pre style="margin: 0;"> <span id="LC1890" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</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;">via_imp_tvs</span></span>
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1891
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<pre style="margin: 0;"> <span id="LC1891" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">via_body</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">via_ty'</span></span>
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<pre style="margin: 0;"> <span id="LC1892" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">via_exp_tv_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">via_rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitLHsForAllTyInvis_KP</span> <span class="n" style="color: #333;">via_body</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">@@ -1893,10 +1896,8 @@ rnLDerivStrategy doc mds thing_inside</td>
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<pre style="margin: 0;"> <span id="LC1896" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `via` type.</span></span>
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<pre style="margin: 0;"> <span id="LC1897" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [No nested foralls or contexts in instance types]</span></span>
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1898
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<pre style="margin: 0;"> <span id="LC1898" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (Wrinkle: Derived instances) in GHC.Hs.Type.</span></span>
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<pre style="margin: 0;">-<span id="LC1896" class="line" lang="haskell"> <span class="n" style="color: #333;">whenIsJust</span> <span class="p">(</span><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span></span>
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<pre style="margin: 0;">-<span id="LC1897" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"via"</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"type"</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1898" class="line" lang="haskell"> <span class="n" style="color: #333;">via_rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC1899" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">err_msg</span></span>
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<pre style="margin: 0;">+<span id="LC1899" class="line" lang="haskell"> <span class="n" style="color: #333;">addNoNestedForallsContextsErr</span> <span class="n" style="color: #333;">doc</span></span>
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<pre style="margin: 0;">+<span id="LC1900" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"via"</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"type"</span><span class="p">)</span> <span class="n" style="color: #333;">via_rho</span></span>
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1900
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1901
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<pre style="margin: 0;"> <span id="LC1901" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">thing</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;">extendTyVarEnvFVRn</span> <span class="n" style="color: #333;">via_tvs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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1901
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1902
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<pre style="margin: 0;"> <span id="LC1902" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ViaStrategy</span> <span class="n" style="color: #333;">via_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</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>
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1902
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1903
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<pre style="margin: 0;"> <span id="LC1903" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2213,7 +2214,7 @@ rnConDecl (XConDecl (ConDeclGADTPrefixPs { con_gp_names = names, con_gp_ty = ty</td>
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2213
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2214
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<pre style="margin: 0;"> <span id="LC2214" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb_doc'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnMbLHsDoc</span> <span class="n" style="color: #333;">mb_doc</span></span>
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2214
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2215
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<pre style="margin: 0;"> <span id="LC2215" class="line" lang="haskell"></span>
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2215
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2216
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<pre style="margin: 0;"> <span id="LC2216" 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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2216
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<pre style="margin: 0;">-<span id="LC2216" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</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;">ty</span></span>
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2217
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<pre style="margin: 0;">+<span id="LC2217" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">ty</span></span>
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2217
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2218
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<pre style="margin: 0;"> <span id="LC2218" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">linearTypes</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xopt</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">LinearTypes</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getDynFlags</span></span>
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2218
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2219
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<pre style="margin: 0;"> <span id="LC2219" class="line" lang="haskell"></span>
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2219
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2220
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<pre style="margin: 0;"> <span id="LC2220" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now that operator precedence has been resolved, we can split 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">@@ -2232,10 +2233,8 @@ rnConDecl (XConDecl (ConDeclGADTPrefixPs { con_gp_names = names, con_gp_ty = ty</td>
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2232
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2233
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<pre style="margin: 0;"> <span id="LC2233" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Ensure that there are no nested `forall`s or contexts, per</span></span>
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2233
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2234
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<pre style="margin: 0;"> <span id="LC2234" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [GADT abstract syntax] (Wrinkle: No nested foralls or contexts)</span></span>
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2234
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2235
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<pre style="margin: 0;"> <span id="LC2235" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Hs.Type.</span></span>
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2235
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<pre style="margin: 0;">-<span id="LC2235" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">whenIsJust</span> <span class="p">(</span><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span></span>
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2236
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<pre style="margin: 0;">-<span id="LC2236" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"GADT constructor type signature"</span><span class="p">)</span></span>
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2237
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<pre style="margin: 0;">-<span id="LC2237" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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2238
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<pre style="margin: 0;">-<span id="LC2238" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err_msg</span></span>
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2236
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<pre style="margin: 0;">+<span id="LC2236" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">addNoNestedForallsContextsErr</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;">+<span id="LC2237" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"GADT constructor type signature"</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC2238" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2239" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"rnConDecl (ConDeclGADTPrefixPs)"</span></span>
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<pre style="margin: 0;"> <span id="LC2240" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">names</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implicit_tkvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">explicit_tkvs</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2273,41 +2272,6 @@ rnConDeclDetails con doc (RecCon (L l fields))</td>
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<pre style="margin: 0;"> <span id="LC2272" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- since that is done by GHC.Rename.Names.extendGlobalRdrEnvRn</span></span>
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<pre style="margin: 0;"> <span id="LC2273" 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;">RecCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">new_fields</span><span class="p">),</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2274" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2276" class="line" lang="haskell"><span class="cd">-- | Examines a non-outermost type for @forall@s or contexts, which are assumed</span></span>
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<pre style="margin: 0;">-<span id="LC2277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to be nested. Returns @'Just' err_msg@ if such a @forall@ or context is</span></span>
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<pre style="margin: 0;">-<span id="LC2278" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- found, and returns @Nothing@ otherwise.</span></span>
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<pre style="margin: 0;">-<span id="LC2279" 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="LC2280" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is currently used in two places:</span></span>
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<pre style="margin: 0;">-<span id="LC2281" 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="LC2282" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * In GADT constructor types (in 'rnConDecl').</span></span>
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<pre style="margin: 0;">-<span id="LC2283" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [GADT abstract syntax] (Wrinkle: No nested foralls or contexts)@</span></span>
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2284
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<pre style="margin: 0;">-<span id="LC2284" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in "GHC.Hs.Type".</span></span>
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<pre style="margin: 0;">-<span id="LC2285" 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="LC2286" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * In instance declaration types (in 'rnClsIntDecl' and 'rnSrcDerivDecl').</span></span>
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2287
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<pre style="margin: 0;">-<span id="LC2287" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [No nested foralls or contexts in instance types]@ in</span></span>
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<pre style="margin: 0;">-<span id="LC2288" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- "GHC.Hs.Type".</span></span>
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<pre style="margin: 0;">-<span id="LC2289" class="line" lang="haskell"><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span></span>
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2290
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<pre style="margin: 0;">-<span id="LC2290" class="line" lang="haskell"><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">lty</span> <span class="o" style="font-weight: 600;">=</span></span>
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2291
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<pre style="margin: 0;">-<span id="LC2291" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ignoreParens</span> <span class="n" style="color: #333;">lty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2292
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<pre style="margin: 0;">-<span id="LC2292" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_tele</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tele</span> <span class="p">})</span></span>
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2293
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<pre style="margin: 0;">-<span id="LC2293" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsForAllVis</span><span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tele</span></span>
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2294
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<pre style="margin: 0;">-<span id="LC2294" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The only two places where this function is called correspond to</span></span>
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2295
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<pre style="margin: 0;">-<span id="LC2295" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- types of terms, so we give a slightly more descriptive error</span></span>
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2296
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<pre style="margin: 0;">-<span id="LC2296" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- message in the event that they contain visible dependent</span></span>
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2297
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<pre style="margin: 0;">-<span id="LC2297" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- quantification (currently only allowed in kinds).</span></span>
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2298
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<pre style="margin: 0;">-<span id="LC2298" class="line" lang="haskell"> <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;">l</span><span class="p">,</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal visible, dependent quantification"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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2299
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<pre style="margin: 0;">-<span id="LC2299" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"in the type of a term"</span></span>
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2300
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<pre style="margin: 0;">-<span id="LC2300" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(GHC does not yet support this)"</span> <span class="p">])</span></span>
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2301
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<pre style="margin: 0;">-<span id="LC2301" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsForAllInvis</span><span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tele</span></span>
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2302
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<pre style="margin: 0;">-<span id="LC2302" class="line" lang="haskell"> <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;">l</span><span class="p">,</span> <span class="n" style="color: #333;">nested_foralls_contexts_err</span><span class="p">)</span></span>
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2303
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<pre style="margin: 0;">-<span id="LC2303" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{})</span></span>
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2304
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<pre style="margin: 0;">-<span id="LC2304" class="line" lang="haskell"> <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;">l</span><span class="p">,</span> <span class="n" style="color: #333;">nested_foralls_contexts_err</span><span class="p">)</span></span>
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2305
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<pre style="margin: 0;">-<span id="LC2305" 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;">Nothing</span></span>
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2306
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<pre style="margin: 0;">-<span id="LC2306" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2307
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<td class="diff-line-num new_line old" data-linenumber="2275" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2307" class="line" lang="haskell"> <span class="n" style="color: #333;">nested_foralls_contexts_err</span> <span class="o" style="font-weight: 600;">=</span></span>
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2308
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<td class="diff-line-num new_line old" data-linenumber="2275" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2308" class="line" lang="haskell"> <span class="n" style="color: #333;">what</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"cannot contain nested"</span></span>
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2309
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<pre style="margin: 0;">-<span id="LC2309" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="n" style="color: #333;">forAllLit</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"s or contexts"</span></span>
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2310
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<pre style="margin: 0;">-<span id="LC2310" class="line" lang="haskell"></span>
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2311
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2275
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<pre style="margin: 0;"> <span id="LC2275" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------------------------------------</span></span>
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2312
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2276
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<pre style="margin: 0;"> <span id="LC2276" class="line" lang="haskell"></span>
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2313
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<pre style="margin: 0;"> <span id="LC2277" class="line" lang="haskell"><span class="cd">-- | Brings pattern synonym names and also pattern synonym selectors</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#cfa41b5649933e5b12f7796e9d49b9dd6a0bc59f"><strong>compiler/GHC/Rename/Pat.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">@@ -412,7 +412,7 @@ rnPatAndThen mk (SigPat x pat sig)</td>
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<pre style="margin: 0;"> <span id="LC412" 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;">SigPat</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pat'</span> <span class="n" style="color: #333;">sig'</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"> <span class="n" style="color: #333;">rnHsPatSigTypeAndThen</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsPatSigType</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;">CpsRn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsPatSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC415" class="line" lang="haskell"> <span class="n" style="color: #333;">rnHsPatSigTypeAndThen</span> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CpsRn</span> <span class="p">(</span><span class="n" style="color: #333;">rnHsPatSigType</span> <span class="kt" style="color: #458; font-weight: 600;">AlwaysBind</span> <span class="kt" style="color: #458; font-weight: 600;">PatCtx</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;">sig</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="haskell"> <span class="n" style="color: #333;">rnHsPatSigTypeAndThen</span> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CpsRn</span> <span class="p">(</span><span class="n" style="color: #333;">rnHsPatSigType</span> <span class="kt" style="color: #458; font-weight: 600;">AlwaysBind</span> <span class="kt" style="color: #458; font-weight: 600;">PatCtx</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell"><span class="n" style="color: #333;">rnPatAndThen</span> <span class="n" style="color: #333;">mk</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LitPat</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC418" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsString</span> <span class="n" style="color: #333;">src</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lit</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#939d24c1002dc322659c1f67c9f3d2db2ae31dd4"><strong>compiler/GHC/Rename/Utils.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -26,8 +26,10 @@ module GHC.Rename.Utils (</td>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">bindLocalNames</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bindLocalNamesFV</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addNameClashErrRn</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendTyVarEnvFVRn</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;">addNameClashErrRn</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendTyVarEnvFVRn</span><span class="p"><span class="idiff left right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"></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;">checkInferredVars</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;">noNestedForallsContextsErr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addNoNestedForallsContextsErr</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">where</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">@@ -35,6 +37,7 @@ where</td>
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37
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</span></span>
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39
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"></span>
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40
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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38
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41
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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39
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42
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Reader</span></span>
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40
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Types</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">@@ -49,6 +52,7 @@ import GHC.Utils.Outputable</td>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</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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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.List.SetOps</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">removeDups</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">whenIsJust</span> <span class="p">)</span></span>
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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.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></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;">Control.Monad</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="180" 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">@@ -176,6 +180,136 @@ checkShadowedOccs (global_env,local_env) get_loc_occ ns</td>
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176
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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="n" style="color: #333;">xopt</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">RecordWildCards</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"> <span class="n" style="color: #333;">is_shadowed_gre</span> <span class="n" style="color: #333;">_other</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC183" 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="LC184" class="line" lang="haskell"><span class="cd">-- | Throw an error message if a user attempts to quantify an inferred type</span></span>
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variable in a place where specificity cannot be observed. For example,</span></span>
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @forall {a}. [a] -> [a]@ would be rejected to the inferred type variable</span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @{a}@, but @forall a. [a] -> [a]@ would be accepted.</span></span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [Unobservably inferred type variables]@.</span></span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"><span class="n" style="color: #333;">checkInferredVars</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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190
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<pre style="margin: 0;">+<span id="LC190" 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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191
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<pre style="margin: 0;">+<span id="LC191" 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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192
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- manually written inferred variables.</span></span>
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193
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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194
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<pre style="margin: 0;">+<span id="LC194" 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="nb" style="color: #0086b3;">()</span></span>
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195
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="haskell"><span class="n" style="color: #333;">checkInferredVars</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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196
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="haskell"><span class="n" style="color: #333;">checkInferredVars</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">msg</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span></span>
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197
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="haskell"> <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;">forallty_bndrs</span> <span class="p">(</span><span class="n" style="color: #333;">hsSigType</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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198
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">find</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;">InferredSpec</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">hsTyVarBndrFlag</span><span class="p">)</span> <span class="n" style="color: #333;">bndrs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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199
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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200
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addErr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">msg</span></span>
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201
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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202
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"> <span class="n" style="color: #333;">forallty_bndrs</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">]</span></span>
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203
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="haskell"> <span class="n" style="color: #333;">forallty_bndrs</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 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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204
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<pre style="margin: 0;">+<span id="LC204" 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;">forallty_bndrs</span> <span class="n" style="color: #333;">ty'</span></span>
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205
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_tele</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsForAllInvis</span> <span class="p">{</span> <span class="n" style="color: #333;">hsf_invis_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span> <span class="p">}}</span></span>
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206
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;">+<span id="LC207" 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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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"></span>
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209
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<pre style="margin: 0;">+<span id="LC209" 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="LC210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Unobservably inferred type variables]</span></span>
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211
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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212
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">While GHC's parser allows the use of inferred type variables</span></span>
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213
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(e.g., `forall {a}. <...>`) just about anywhere that type variable binders can</span></span>
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214
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">appear, there are some situations where the distinction between inferred and</span></span>
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215
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">specified type variables cannot be observed. For example, consider this</span></span>
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216
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instance declaration:</span></span>
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217
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance forall {a}. Eq (T a) where ...</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Making {a} inferred is pointless, as there is no way for user code to</span></span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"apply" an instance declaration in a way where the inferred/specified</span></span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">distinction would make a difference. (Notably, there is no opportunity</span></span>
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223
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for visible type application of an instance declaration.) Anyone who</span></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">writes such code is likely confused, so in an attempt to be helpful,</span></span>
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225
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we emit an error message if a user writes code like this. The</span></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">checkInferredVars function is responsible for implementing this</span></span>
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227
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">restriction.</span></span>
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228
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It turns out to be somewhat cumbersome to enforce this restriction in</span></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">certain cases. Specifically:</span></span>
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<pre style="margin: 0;">+<span id="LC231" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Quantified constraints. In the type `f :: (forall {a}. C a) => Proxy Int`,</span></span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> there is no way to observe that {a} is inferred. Nevertheless, actually</span></span>
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rejecting this code would be tricky, as we would need to reject</span></span>
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235
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `forall {a}. <...>` as a constraint but *accept* other uses of</span></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `forall {a}. <...>` as a type (e.g., `g :: (forall {a}. a -> a) -> b -> b`).</span></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is quite tedious to do in practice, so we don't bother.</span></span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Default method type signatures (#18432). These are tricky because inferred</span></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type variables can appear nested, e.g.,</span></span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"></span>
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242
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a where</span></span>
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<pre style="margin: 0;">+<span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m :: forall b. a -> b -> forall c. c -> c</span></span>
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> default m :: forall b. a -> b -> forall {c}. c -> c</span></span>
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m _ _ = id</span></span>
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<pre style="margin: 0;">+<span id="LC246" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Robustly checking for nested, inferred type variables ends up being a pain,</span></span>
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248
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<pre style="margin: 0;">+<span id="LC248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so we don't try to do this.</span></span>
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<pre style="margin: 0;">+<span id="LC249" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For now, we simply allow inferred quantifiers to be specified here,</span></span>
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<pre style="margin: 0;">+<span id="LC251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">even though doing so is pointless. All we lose is a warning.</span></span>
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<pre style="margin: 0;">+<span id="LC252" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Aside from the places where we already use checkInferredVars, most of</span></span>
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the other places where inferred vars don't make sense are in any case</span></span>
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">already prohibited from having foralls /at all/. For example:</span></span>
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256
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"></span>
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257
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<pre style="margin: 0;">+<span id="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance forall a. forall {b}. Eq (Either a b) where ...</span></span>
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258
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"></span>
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259
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here the nested `forall {b}` is already prohibited. (See</span></span>
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260
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [No nested foralls or contexts in instance types] in GHC.Hs.Type).</span></span>
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261
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"><span class="cd">-- | Examines a non-outermost type for @forall@s or contexts, which are assumed</span></span>
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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to be nested. For example, in the following declaration:</span></span>
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265
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- instance forall a. forall b. C (Either a b)</span></span>
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268
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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269
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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270
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The outermost @forall a@ is fine, but the nested @forall b@ is not. We</span></span>
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271
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- invoke 'noNestedForallsContextsErr' on the type @forall b. C (Either a b)@</span></span>
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272
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to catch the nested @forall@ and create a suitable error message.</span></span>
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273
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'noNestedForallsContextsErr' returns @'Just' err_msg@ if such a @forall@ or</span></span>
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274
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- context is found, and returns @Nothing@ otherwise.</span></span>
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275
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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276
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is currently used in the following places:</span></span>
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277
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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278
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * In GADT constructor types (in 'rnConDecl').</span></span>
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279
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [GADT abstract syntax] (Wrinkle: No nested foralls or contexts)@</span></span>
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in "GHC.Hs.Type".</span></span>
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281
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<pre style="margin: 0;">+<span id="LC281" 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="LC282" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * In instance declaration types (in 'rnClsIntDecl' and 'rnSrcDerivDecl' in</span></span>
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283
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- "GHC.Rename.Module" and 'renameSig' in "GHC.Rename.Bind").</span></span>
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<pre style="margin: 0;">+<span id="LC284" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [No nested foralls or contexts in instance types]@ in</span></span>
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285
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<pre style="margin: 0;">+<span id="LC285" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- "GHC.Hs.Type".</span></span>
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286
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<pre style="margin: 0;">+<span id="LC286" class="line" lang="haskell"><span class="n" style="color: #333;">noNestedForallsContextsErr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span></span>
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287
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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"><span class="n" style="color: #333;">noNestedForallsContextsErr</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">lty</span> <span class="o" style="font-weight: 600;">=</span></span>
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288
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<pre style="margin: 0;">+<span id="LC288" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ignoreParens</span> <span class="n" style="color: #333;">lty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_tele</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tele</span> <span class="p">})</span></span>
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290
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsForAllVis</span><span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tele</span></span>
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291
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The only two places where this function is called correspond to</span></span>
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292
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- types of terms, so we give a slightly more descriptive error</span></span>
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293
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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- message in the event that they contain visible dependent</span></span>
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- quantification (currently only allowed in kinds).</span></span>
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295
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"> <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;">l</span><span class="p">,</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal visible, dependent quantification"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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296
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"in the type of a term"</span></span>
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297
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(GHC does not yet support this)"</span> <span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsForAllInvis</span><span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tele</span></span>
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"> <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;">l</span><span class="p">,</span> <span class="n" style="color: #333;">nested_foralls_contexts_err</span><span class="p">)</span></span>
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300
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{})</span></span>
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"> <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;">l</span><span class="p">,</span> <span class="n" style="color: #333;">nested_foralls_contexts_err</span><span class="p">)</span></span>
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302
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<pre style="margin: 0;">+<span id="LC302" 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;">Nothing</span></span>
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303
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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304
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"> <span class="n" style="color: #333;">nested_foralls_contexts_err</span> <span class="o" style="font-weight: 600;">=</span></span>
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<td class="diff-line-num new new_line" data-linenumber="305" 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">
305
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"> <span class="n" style="color: #333;">what</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"cannot contain nested"</span></span>
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306
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="n" style="color: #333;">forAllLit</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"s or contexts"</span></span>
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307
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"></span>
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308
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"><span class="cd">-- | A common way to invoke 'noNestedForallsContextsErr'.</span></span>
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309
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"><span class="n" style="color: #333;">addNoNestedForallsContextsErr</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;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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310
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"><span class="n" style="color: #333;">addNoNestedForallsContextsErr</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">lty</span> <span class="o" style="font-weight: 600;">=</span></span>
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311
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"> <span class="n" style="color: #333;">whenIsJust</span> <span class="p">(</span><span class="n" style="color: #333;">noNestedForallsContextsErr</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">lty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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312
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err_msg</span></span>
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179
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313
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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181
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315
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#b2bbbaa9afa7dee8f4b5ad5d88a54a403707596c"><strong>testsuite/tests/quantified-constraints/T18432.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE QuantifiedConstraints #-}</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">forall</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="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#f1610e4f96b054482dbf49790fc6c1fa50e45ae2"><strong>testsuite/tests/quantified-constraints/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -29,3 +29,4 @@ test('T17267c', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17267d</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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30
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30
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17267e</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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31
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17458</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18432</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#f2f8be1d5db1924734332ee9da4296f24c549221"><strong>testsuite/tests/typecheck/should_fail/ExplicitSpecificity4.hs</strong>
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<strong>testsuite/tests/typecheck/should_compile/ExplicitSpecificity4.hs</strong>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="712" 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">@@ -712,6 +712,7 @@ test('T18129', expect_broken(18129), compile, [''])</td>
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712
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18185</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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713
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713
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<pre style="margin: 0;"> <span id="LC713" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificityA1</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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714
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714
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificityA2</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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715
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity4</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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715
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716
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<pre style="margin: 0;"> <span id="LC716" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17775-viewpats-a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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716
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717
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<pre style="margin: 0;"> <span id="LC717" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17775-viewpats-b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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717
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718
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<pre style="margin: 0;"> <span id="LC718" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17775-viewpats-c</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#81c6ad9f91d49f90a4af407219e2c58b6b5b8ed0"><strong>testsuite/tests/typecheck/should_fail/T18455.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18455</span> <span class="kr" style="font-weight: 600;">where</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# SPECIALISE instance forall a. forall b. C (Either a b) #-}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#6c88bbe3db19f92289b0114b3fd4fd587211bd2c"><strong>testsuite/tests/typecheck/should_fail/T18455.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18455.hs:7:37: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> SPECIALISE instance type cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In a SPECIALISE instance pragma</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -568,7 +568,6 @@ test('T18127a', normal, compile_fail, [''])</td>
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568
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity1</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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569
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569
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity2</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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570
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity3</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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571
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<pre style="margin: 0;">-<span id="LC571" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity4</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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572
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571
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity5</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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573
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572
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity6</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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574
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573
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ExplicitSpecificity7</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</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="578" 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="577" 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">@@ -578,3 +577,4 @@ test('ExplicitSpecificity10', normal, compile_fail, [''])</td>
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578
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577
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18357</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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579
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578
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18357a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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580
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579
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18357b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18455</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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