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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/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190">102cfd67</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-05-13T20:04:46-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Factor out HsPatSigType for pat sigs/RULE term sigs (#16762)
This implements chunks (2) and (3) of
https://gitlab.haskell.org/ghc/ghc/issues/16762#note_270170. Namely,
it introduces a dedicated `HsPatSigType` AST type, which represents
the types that can appear in pattern signatures and term-level `RULE`
binders. Previously, these were represented with `LHsSigWcType`.
Although `LHsSigWcType` is isomorphic to `HsPatSigType`, the intended
semantics of the two types are slightly different, as evidenced by
the fact that they have different code paths in the renamer and
typechecker.
See also the new `Note [Pattern signature binders and scoping]` in
`GHC.Hs.Types`.
</pre>
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<h4>18 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#75bfcd03f3ba9315d33104fcb0424c6bfeb4e334">
compiler/GHC/Hs/Decls.hs
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<li class="file-stats">
<a href="#576dff4e64fa03683ffc5dcdd58284acdd70bc8e">
compiler/GHC/Hs/Extension.hs
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<li class="file-stats">
<a href="#9f00edfedb0f969865b049a78de3866545b4a60b">
compiler/GHC/Hs/Instances.hs
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<li class="file-stats">
<a href="#0bae7e7e67b5f9b6ba2a371f8917cf74423a0c6f">
compiler/GHC/Hs/Pat.hs
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<li class="file-stats">
<a href="#8cd3d37b8a77c01a0e798e67591fc3ea9c34c9ec">
compiler/GHC/Hs/Types.hs
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<li class="file-stats">
<a href="#3c19c0be465f9a28d7b69f89c55648080fcc37eb">
compiler/GHC/HsToCore/Quote.hs
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<a href="#649144a78135a23cabfc90dd83c4aabf448eb6ab">
compiler/GHC/Iface/Ext/Ast.hs
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<li class="file-stats">
<a href="#446cb12ca6cefaf1c6eb79b7db643632744263c7">
compiler/GHC/Parser/PostProcess.hs
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<li class="file-stats">
<a href="#af762064d779f7308dd415966c974f27d14f9943">
compiler/GHC/Rename/Bind.hs
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<li class="file-stats">
<a href="#b47ece2bbb8303a5792c2fdc52394c8ed336e8a2">
compiler/GHC/Rename/Expr.hs
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<li class="file-stats">
<a href="#892acbb198a9095c917740d3c1297b56df4e3b7e">
compiler/GHC/Rename/HsType.hs
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<li class="file-stats">
<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
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<a href="#cfa41b5649933e5b12f7796e9d49b9dd6a0bc59f">
compiler/GHC/Rename/Pat.hs
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<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<li class="file-stats">
<a href="#3ee8be814b6c6727880deab3772e6af922524bf0">
compiler/GHC/Tc/Gen/Pat.hs
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<li class="file-stats">
<a href="#04338da99bccd89402218ca19c5724762f0fe641">
compiler/GHC/Tc/Gen/Rule.hs
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<li class="file-stats">
<a href="#2eac51f9871ca0c0698aa1fc7f79c05ef8fc4a49">
compiler/GHC/ThToHs.hs
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<li class="file-stats">
<a href="#62a9ebd99858aa7fc936319bea9fdd9a6954ba63">
testsuite/tests/hiefile/should_compile/hie007.hs
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<h4>Changes:</h4>
<li id="75bfcd03f3ba9315d33104fcb0424c6bfeb4e334">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#75bfcd03f3ba9315d33104fcb0424c6bfeb4e334"><strong>compiler/GHC/Hs/Decls.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">@@ -2244,7 +2244,7 @@ type LRuleBndr pass = Located (RuleBndr pass)</td>
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2244
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<pre style="margin: 0;"> <span id="LC2244" class="line" lang="haskell"><span class="cd">-- | Rule Binder</span></span>
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<pre style="margin: 0;"> <span id="LC2245" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">RuleBndr</span> <span class="n" style="color: #333;">pass</span></span>
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<pre style="margin: 0;"> <span id="LC2246" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RuleBndr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XCRuleBndr</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdP</span> <span class="n" style="color: #333;">pass</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC2247" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">RuleBndrSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XRuleBndrSig</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdP</span> <span class="n" style="color: #333;">pass</span><span class="p">))</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">LHsSigWc</span>Type</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2247" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">RuleBndrSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XRuleBndrSig</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdP</span> <span class="n" style="color: #333;">pass</span><span class="p">))</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">HsPatSig</span>Type</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2248" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">XRuleBndr</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XXRuleBndr</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2249" 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="LC2250" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- - 'ApiAnnotation.AnnKeywordId' : 'ApiAnnotation.AnnOpen',</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2256" 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="2256" 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">@@ -2256,7 +2256,7 @@ type instance XCRuleBndr (GhcPass _) = NoExtField</td>
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<pre style="margin: 0;"> <span id="LC2256" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XRuleBndrSig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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<pre style="margin: 0;"> <span id="LC2257" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XXRuleBndr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtCon</span></span>
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<pre style="margin: 0;"> <span id="LC2258" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2259" class="line" lang="haskell"><span class="n" style="color: #333;">collectRuleBndrSigTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">RuleBndr</span> <span class="n" style="color: #333;">pass</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">LHsSigWc</span>Type</span> <span class="n" style="color: #333;">pass</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC2259" class="line" lang="haskell"><span class="n" style="color: #333;">collectRuleBndrSigTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">RuleBndr</span> <span class="n" style="color: #333;">pass</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">HsPatSig</span>Type</span> <span class="n" style="color: #333;">pass</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2260" class="line" lang="haskell"><span class="n" style="color: #333;">collectRuleBndrSigTys</span> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">RuleBndrSig</span> <span class="kr" style="font-weight: 600;">_</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;">bndrs</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2261" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2262" class="line" lang="haskell"><span class="n" style="color: #333;">pprFullRuleName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SourceText</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RuleName</span><span class="p">)</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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#576dff4e64fa03683ffc5dcdd58284acdd70bc8e"><strong>compiler/GHC/Hs/Extension.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">@@ -685,6 +685,11 @@ type family XXHsWildCardBndrs x b</td>
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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="c1" style="color: #998; font-style: italic;">-- -------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">XHsPS</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">XXHsPatSigType</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC691" 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="LC693" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">XForAllTy</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">XQualTy</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC695" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">XTyVar</span> <span class="n" style="color: #333;">x</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#9f00edfedb0f969865b049a78de3866545b4a60b"><strong>compiler/GHC/Hs/Instances.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">@@ -386,6 +386,11 @@ deriving instance (Data thing) => Data (HsWildCardBndrs GhcPs thing)</td>
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Data</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Data</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWildCardBndrs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Data</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Data</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWildCardBndrs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- deriving instance (DataIdLR p p) => Data (HsPatSigType p)</span></span>
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Data</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;">GhcPs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Data</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="LC392" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Data</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;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- deriving instance (DataIdLR p p) => Data (HsTyVarBndr p)</span></span>
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Data</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;">GhcPs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Data</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;">GhcRn</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#0bae7e7e67b5f9b6ba2a371f8917cf74423a0c6f"><strong>compiler/GHC/Hs/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">@@ -240,7 +240,7 @@ data Pat p</td>
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For details on above see note [Api annotations] in GHC.Parser.Annotation</span></span>
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<pre style="margin: 0;"> <span id="LC241" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SigPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XSigPat</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- After typechecker: Type</span></span>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Pattern with a type signature</span></span>
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<pre style="margin: 0;">-<span id="LC243" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">LHsSigWc</span>Type</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoGhcTc</span> <span class="n" style="color: #333;">p</span><span class="p">))</span> <span class="c1" style="color: #998; font-style: italic;">-- Signature can bind both</span></span>
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<pre style="margin: 0;">+<span id="LC243" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">HsPatSig</span>Type</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoGhcTc</span> <span class="n" style="color: #333;">p</span><span class="p">))</span> <span class="c1" style="color: #998; font-style: italic;">-- Signature can bind both</span></span>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- kind and type vars</span></span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Pattern with a type signature</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#8cd3d37b8a77c01a0e798e67591fc3ea9c34c9ec"><strong>compiler/GHC/Hs/Types.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">@@ -23,6 +23,7 @@ module GHC.Hs.Types (</td>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LHsQTyVars</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsImplicitBndrs</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="LC25" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsWildCardBndrs</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="LC26" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsPatSigType</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;">HsPSRn</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="LC27" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsWcType</span><span class="p">,</span></span>
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27
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsTupleSort</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="LC29" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsContext</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsContext</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">noLHsContext</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">@@ -47,7 +48,7 @@ module GHC.Hs.Types (</td>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkAnonWildCardTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprAnonWildCard</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC50" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHsImplicitBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHsWildCardBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsImplicitBody</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHsImplicitBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHsWildCardBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">mkHsPatSigType</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">hsImplicitBody</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkEmptyImplicitBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkEmptyWildCardBndrs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHsQTvs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsQTvExplicit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emptyLHsQTvs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEmptyLHsQTvs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isHsKindedTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsTvbAllKinded</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isLHsForAllTy</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">@@ -59,7 +60,7 @@ module GHC.Hs.Types (</td>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitLHsForAllTyInvis</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitLHsQualTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitLHsSigmaTyInvis</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitHsFunType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsTyGetAppHead_maybe</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHsOpTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHsAppTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHsAppTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHsAppKindTy</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ignoreParens</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsSigType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsSigWcType</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ignoreParens</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsSigType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsSigWcType</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">hsPatSigType</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hsLTyVarBndrToType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsLTyVarBndrsToTypes</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hsTyKindSig</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hsConDetailsArgs</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="185" 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">@@ -184,6 +185,13 @@ is a bit complicated. Here's how it works.</td>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: _a -> _</span></span>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The enclosing HsWildCardBndrs binds the wildcards _a and _.</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* HsSigPatType describes types that appear in pattern signatures and</span></span>
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the signatures of term-level binders in RULES. Like</span></span>
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> HsWildCardBndrs/HsImplicitBndrs, they track the names of wildcard</span></span>
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> variables and implicitly bound type variables. Unlike</span></span>
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> HsImplicitBndrs, however, HsSigPatTypes do not obey the</span></span>
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall-or-nothing rule. See Note [Pattern signature binders and scoping].</span></span>
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The explicit presence of these wrappers specifies, in the HsSyn,</span></span>
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exactly where implicit quantification is allowed, and where</span></span>
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wildcards are allowed.</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">@@ -225,13 +233,15 @@ Note carefully:</td>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here _a is an ordinary forall'd binder, but (With NamedWildCards)</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;"> _b is a named wildcard. (See the comments in #10982)</span></span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Named wildcards are bound by the HsWildCardBndrs construct, which wraps</span></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;"> types that are allowed to have wildcards. Unnamed wildcards however are left</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;"> unchanged until typechecking, where we give them fresh wild tyavrs and</span></span>
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<pre style="margin: 0;">-<span id="LC231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> determine whether or not to emit hole constraints on each wildcard</span></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;"> (we don't if it's a visible type/kind argument or a type family pattern).</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;"> See related notes Note [Wildcards in visible kind application]</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;"> and Note [Wildcards in visible type application] in GHC.Tc.Gen.HsType</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;">* Named wildcards are bound by the HsWildCardBndrs (for types that obey the</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;"> forall-or-nothing rule) and HsPatSigType (for type signatures in patterns</span></span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and term-level binders in RULES), which wrap types that are allowed to have</span></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;"> wildcards. Unnamed wildcards, however are left unchanged until typechecking,</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;"> where we give them fresh wild tyvars and determine whether or not to emit</span></span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> hole constraints on each wildcard (we don't if it's a visible type/kind</span></span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> argument or a type family pattern). See related notes</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;"> Note [Wildcards in visible kind application] and</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;"> Note [Wildcards in visible type application] in GHC.Tc.Gen.HsType.</span></span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* After type checking is done, we report what types the wildcards</span></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;"> got unified with.</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">@@ -399,6 +409,33 @@ type instance XHsWC GhcTc b = [Name]</td>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XXHsWildCardBndrs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtCon</span></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC412" class="line" lang="haskell"><span class="cd">-- | Types that can appear in pattern signatures, as well as the signatures for</span></span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- term-level binders in RULES.</span></span>
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [Pattern signature binders and scoping]@.</span></span>
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<pre style="margin: 0;">+<span id="LC415" 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="LC416" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is very similar to 'HsSigWcType', but with</span></span>
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- slightly different semantics: see @Note [HsType binders]@.</span></span>
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<pre style="margin: 0;">+<span id="LC418" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also @Note [The wildcard story for types]@.</span></span>
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HsPatSigType</span> <span class="n" style="color: #333;">pass</span></span>
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<pre style="margin: 0;">+<span id="LC420" class="line" lang="haskell"> <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="kt" style="color: #458; font-weight: 600;">XHsPS</span> <span class="n" style="color: #333;">pass</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ After renamer: 'HsPSRn'</span></span>
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<pre style="margin: 0;">+<span id="LC421" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsps_body</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Main payload (the type itself)</span></span>
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<pre style="margin: 0;">+<span id="LC422" class="line" lang="haskell"> <span class="p">}</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;">XHsPatSigType</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XXHsPatSigType</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC424" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"><span class="cd">-- | The extension field for 'HsPatSigType', which is only used in the</span></span>
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<pre style="margin: 0;">+<span id="LC426" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- renamer onwards. See @Note [Pattern signature binders and scoping]@.</span></span>
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<pre style="margin: 0;">+<span id="LC427" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HsPSRn</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsPSRn</span></span>
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428
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<pre style="margin: 0;">+<span id="LC428" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">hsps_nwcs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Wildcard names</span></span>
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429
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<pre style="margin: 0;">+<span id="LC429" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsps_imp_tvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Implicitly bound variable names</span></span>
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<pre style="margin: 0;">+<span id="LC430" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC431" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Data</span></span>
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<pre style="margin: 0;">+<span id="LC432" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC433" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XHsPS</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;">NoExtField</span></span>
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434
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XHsPS</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;">HsPSRn</span></span>
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435
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XHsPS</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsPSRn</span></span>
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<pre style="margin: 0;">+<span id="LC436" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC437" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XXHsPatSigType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtCon</span></span>
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<pre style="margin: 0;">+<span id="LC438" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="haskell"><span class="cd">-- | Located Haskell Signature Type</span></span>
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403
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<pre style="margin: 0;"> <span id="LC440" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="n" style="color: #333;">pass</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsImplicitBndrs</span> <span class="n" style="color: #333;">pass</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Implicit only</span></span>
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<pre style="margin: 0;"> <span id="LC441" 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">@@ -419,6 +456,9 @@ hsSigType = hsImplicitBody</td>
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell"><span class="n" style="color: #333;">hsSigWcType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span> <span class="n" style="color: #333;">pass</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span></span>
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell"><span class="n" style="color: #333;">hsSigWcType</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsib_body</span> <span class="p">(</span><span class="n" style="color: #333;">hswc_body</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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458
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"><span class="n" style="color: #333;">hsPatSigType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsPatSigType</span> <span class="n" style="color: #333;">pass</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span></span>
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<pre style="margin: 0;">+<span id="LC460" class="line" lang="haskell"><span class="n" style="color: #333;">hsPatSigType</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsps_body</span></span>
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<pre style="margin: 0;">+<span id="LC461" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell"><span class="n" style="color: #333;">dropWildCards</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span> <span class="n" style="color: #333;">pass</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="n" style="color: #333;">pass</span></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Drop the wildcard part of a LHsSigWcType</span></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"><span class="n" style="color: #333;">dropWildCards</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hswc_body</span> <span class="n" style="color: #333;">sig_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">@@ -441,6 +481,71 @@ we get</td>
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<pre style="margin: 0;"> <span id="LC481" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , hst_body = blah }</span></span>
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482
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<pre style="margin: 0;"> <span id="LC482" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The implicit kind variable 'k' is bound by the HsIB;</span></span>
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<pre style="margin: 0;"> <span id="LC483" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the explicitly forall'd tyvar 'a' is bound by the HsForAllTy</span></span>
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<pre style="margin: 0;">+<span id="LC484" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Pattern signature binders and scoping]</span></span>
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<pre style="margin: 0;">+<span id="LC486" 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="LC487" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider the pattern signatures like those on `t` and `g` in:</span></span>
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<pre style="margin: 0;">+<span id="LC488" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = let h = \(t :: (b, b) -></span></span>
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> \(g :: forall a. a -> b) -></span></span>
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<pre style="margin: 0;">+<span id="LC491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...(t :: (Int,Int))...</span></span>
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492
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in woggle</span></span>
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"></span>
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494
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The `b` in t's pattern signature is implicitly bound and scopes over</span></span>
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495
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the signature and the body of the lambda. It stands for a type (any type);</span></span>
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496
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> indeed we subsequently discover that b=Int.</span></span>
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497
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<pre style="margin: 0;">+<span id="LC497" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (See Note [TyVarTv] in GHC.Tc.Utils.TcMType for more on this point.)</span></span>
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498
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<pre style="margin: 0;">+<span id="LC498" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The `b` in g's pattern signature is an /occurrence/ of the `b` bound by</span></span>
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499
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<pre style="margin: 0;">+<span id="LC499" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> t's pattern signature.</span></span>
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500
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<pre style="margin: 0;">+<span id="LC500" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The `a` in `forall a` scopes only over the type `a -> b`, not over the body</span></span>
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501
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of the lambda.</span></span>
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502
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<pre style="margin: 0;">+<span id="LC502" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* There is no forall-or-nothing rule for pattern signatures, which is why the</span></span>
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503
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type `forall a. a -> b` is permitted in `g`'s pattern signature, even though</span></span>
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504
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `b` is not explicitly bound.</span></span>
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505
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [forall-or-nothing rule] in GHC.Rename.HsType.</span></span>
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506
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Similar scoping rules apply to term variable binders in RULES, like in the</span></span>
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508
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<pre style="margin: 0;">+<span id="LC508" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">following example:</span></span>
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509
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="haskell"></span>
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510
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<pre style="margin: 0;">+<span id="LC510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# RULES "h" forall (t :: (b, b)) (g :: forall a. a -> b). h t g = ... #-}</span></span>
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511
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="haskell"></span>
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512
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Just like in pattern signatures, the `b` in t's signature is implicitly bound</span></span>
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513
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and scopes over the remainder of the RULE. As a result, the `b` in g's</span></span>
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514
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<pre style="margin: 0;">+<span id="LC514" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">signature is an occurrence. Moreover, the `a` in `forall a` scopes only over</span></span>
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515
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the type `a -> b`, and the forall-or-nothing rule does not apply.</span></span>
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516
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="haskell"></span>
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517
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<pre style="margin: 0;">+<span id="LC517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">While quite similar, RULE term binder signatures behave slightly differently</span></span>
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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from pattern signatures in two ways:</span></span>
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519
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<pre style="margin: 0;">+<span id="LC519" class="line" lang="haskell"></span>
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520
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Unlike in pattern signatures, where type variables can stand for any type,</span></span>
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521
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type variables in RULE term binder signatures are skolems.</span></span>
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522
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Typechecking pattern signature binders] in GHC.Tc.Gen.HsType for</span></span>
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523
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> more on this point.</span></span>
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524
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"></span>
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525
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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In this sense, type variables in pattern signatures are quite similar to</span></span>
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526
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<pre style="margin: 0;">+<span id="LC526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> named wildcards, as both can refer to arbitrary types. The main difference</span></span>
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527
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> lies in error reporting: if a named wildcard `_a` in a pattern signature</span></span>
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528
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> stands for Int, then by default GHC will emit a warning stating as much.</span></span>
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529
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Changing `_a` to `a`, on the other hand, will cause it not to be reported.</span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. In the `h` RULE above, only term variables are explicitly bound, so any free</span></span>
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531
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type variables in the term variables' signatures are implicitly bound.</span></span>
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532
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is just like how the free type variables in pattern signatures are</span></span>
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533
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> implicitly bound. If a RULE explicitly binds both term and type variables,</span></span>
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534
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> however, then free type variables in term signatures are /not/ implicitly</span></span>
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535
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bound. For example, this RULE would be ill scoped:</span></span>
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536
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell"></span>
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537
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# RULES "h2" forall b. forall (t :: (b, c)) (g :: forall a. a -> b).</span></span>
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538
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<pre style="margin: 0;">+<span id="LC538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h2 t g = ... #-}</span></span>
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539
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"></span>
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540
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is because `b` and `c` occur free in the signature for `t`, but only</span></span>
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541
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `b` was explicitly bound, leaving `c` out of scope. If the RULE had started</span></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with `forall b c.`, then it would have been accepted.</span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The types in pattern signatures and RULE term binder signatures are represented</span></span>
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<pre style="margin: 0;">+<span id="LC545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the AST by HsSigPatType. From the renamer onward, the hsps_ext field (of</span></span>
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<pre style="margin: 0;">+<span id="LC546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type HsPSRn) tracks the names of named wildcards and implicitly bound type</span></span>
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<pre style="margin: 0;">+<span id="LC547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables so that they can be brought into scope during renaming and</span></span>
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<pre style="margin: 0;">+<span id="LC548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">typechecking.</span></span>
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<pre style="margin: 0;"> <span id="LC549" 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="LC550" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="haskell"><span class="n" style="color: #333;">mkHsImplicitBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsImplicitBndrs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="n" style="color: #333;">thing</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">@@ -451,6 +556,10 @@ mkHsWildCardBndrs :: thing -> HsWildCardBndrs GhcPs thing</td>
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="haskell"><span class="n" style="color: #333;">mkHsWildCardBndrs</span> <span class="n" style="color: #333;">x</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_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="haskell"> <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;">noExtField</span> <span class="p">}</span></span>
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558
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<pre style="margin: 0;"> <span id="LC558" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"><span class="n" style="color: #333;">mkHsPatSigType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsPatSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"><span class="n" style="color: #333;">mkHsPatSigType</span> <span class="n" style="color: #333;">x</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;">noExtField</span></span>
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell"> <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;">x</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Add empty binders. This is a bit suspicious; what if</span></span>
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564
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<pre style="margin: 0;"> <span id="LC564" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the wrapped thing had free type variables?</span></span>
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="haskell"><span class="n" style="color: #333;">mkEmptyImplicitBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsImplicitBndrs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="n" style="color: #333;">thing</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1517" 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">@@ -1408,6 +1517,10 @@ instance Outputable thing</td>
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1408
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<pre style="margin: 0;"> <span id="LC1517" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWildCardBndrs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1409
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1518
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<pre style="margin: 0;"> <span id="LC1518" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="p">{</span> <span class="n" style="color: #333;">hswc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span></span>
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1410
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1519
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<pre style="margin: 0;"> <span id="LC1519" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1520" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">OutputableBndrId</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">+<span id="LC1521" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsPatSigType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">p</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1522
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<pre style="margin: 0;">+<span id="LC1522" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsPS</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;">ty</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1523" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1524" class="line" lang="haskell"><span class="n" style="color: #333;">pprAnonWildCard</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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<pre style="margin: 0;"> <span id="LC1525" class="line" lang="haskell"><span class="n" style="color: #333;">pprAnonWildCard</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'_'</span></span>
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<pre style="margin: 0;"> <span id="LC1526" 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">@@ -821,7 +821,7 @@ repRuleD (L loc (HsRule { rd_name = n</td>
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<pre style="margin: 0;"> <span id="LC821" class="line" lang="haskell"><span class="n" style="color: #333;">ruleBndrNames</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LRuleBndr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC822" class="line" lang="haskell"><span class="n" style="color: #333;">ruleBndrNames</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleBndr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">n</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">n</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC823" class="line" lang="haskell"><span class="n" style="color: #333;">ruleBndrNames</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleBndrSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">sig</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC824" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Hs<span class="idiff left">WC</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hswc_body</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsIB</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hsib_ext</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vars</span> <span class="p">}}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Hs<span class="idiff left">PS</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hsps_ext</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsPSRn</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hsps_imp_tvs</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vars</span> <span class="p">}}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;"> <span id="LC825" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">vars</span></span>
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"><span class="n" style="color: #333;">repRuleBndr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LRuleBndr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">RuleBndr</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">@@ -830,7 +830,7 @@ repRuleBndr (L _ (RuleBndr _ n))</td>
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830
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rep2</span> <span class="n" style="color: #333;">ruleVarName</span> <span class="p">[</span><span class="n" style="color: #333;">n'</span><span class="p">]</span> <span class="p">}</span></span>
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831
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831
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"><span class="n" style="color: #333;">repRuleBndr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleBndrSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">sig</span><span class="p">))</span></span>
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832
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832
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<pre style="margin: 0;"> <span id="LC832" 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="kt" style="color: #458; font-weight: 600;">MkC</span> <span class="n" style="color: #333;">n'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupLBinder</span> <span class="n" style="color: #333;">n</span></span>
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833
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<pre style="margin: 0;">-<span id="LC833" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">MkC</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLTy</span> <span class="p">(</span><span class="n" style="color: #333;">hs<span class="idiff left right">SigWc</span>Type</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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833
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">MkC</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLTy</span> <span class="p">(</span><span class="n" style="color: #333;">hs<span class="idiff left right">PatSig</span>Type</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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834
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834
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rep2</span> <span class="n" style="color: #333;">typedRuleVarName</span> <span class="p">[</span><span class="n" style="color: #333;">n'</span><span class="p">,</span> <span class="n" style="color: #333;">ty'</span><span class="p">]</span> <span class="p">}</span></span>
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835
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835
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="haskell"></span>
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836
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836
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"><span class="n" style="color: #333;">repAnnD</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LAnnDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">M</span> <span class="kt" style="color: #458; font-weight: 600;">TH</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Dec</span><span class="p">))</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1935" 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">@@ -1935,7 +1935,7 @@ repP (NPat _ (L _ l) Nothing _) = do { a <- repOverloadedLiteral l</td>
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1935
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1935
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<pre style="margin: 0;"> <span id="LC1935" class="line" lang="haskell"><span class="n" style="color: #333;">repP</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ViewPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">e'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLE</span> <span class="n" style="color: #333;">e</span><span class="p">;</span> <span class="n" style="color: #333;">p'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLP</span> <span class="n" style="color: #333;">p</span><span class="p">;</span> <span class="n" style="color: #333;">repPview</span> <span class="n" style="color: #333;">e'</span> <span class="n" style="color: #333;">p'</span> <span class="p">}</span></span>
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1936
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1936
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<pre style="margin: 0;"> <span id="LC1936" class="line" lang="haskell"><span class="n" style="color: #333;">repP</span> <span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</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;">notHandled</span> <span class="s" style="color: #d14;">"Negative overloaded patterns"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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1937
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1937
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<pre style="margin: 0;"> <span id="LC1937" class="line" lang="haskell"><span class="n" style="color: #333;">repP</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SigPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">p'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLP</span> <span class="n" style="color: #333;">p</span></span>
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1938
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<pre style="margin: 0;">-<span id="LC1938" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">t'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLTy</span> <span class="p">(</span><span class="n" style="color: #333;">hs<span class="idiff left right">SigWc</span>Type</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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1938
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<pre style="margin: 0;">+<span id="LC1938" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">t'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">repLTy</span> <span class="p">(</span><span class="n" style="color: #333;">hs<span class="idiff left right">PatSig</span>Type</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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1939
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1939
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<pre style="margin: 0;"> <span id="LC1939" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">repPsig</span> <span class="n" style="color: #333;">p'</span> <span class="n" style="color: #333;">t'</span> <span class="p">}</span></span>
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1940
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1940
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<pre style="margin: 0;"> <span id="LC1940" class="line" lang="haskell"><span class="n" style="color: #333;">repP</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SplicePat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">splice</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">repSplice</span> <span class="n" style="color: #333;">splice</span></span>
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1941
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1941
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<pre style="margin: 0;"> <span id="LC1941" class="line" lang="haskell"><span class="n" style="color: #333;">repP</span> <span class="n" style="color: #333;">other</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">notHandled</span> <span class="s" style="color: #d14;">"Exotic pattern"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">other</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#649144a78135a23cabfc90dd83c4aabf448eb6ab"><strong>compiler/GHC/Iface/Ext/Ast.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">@@ -413,35 +413,9 @@ bar (x :: forall a. a -> a) = ... -- a is not in scope here</td>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- ^ a is in scope here (pattern body)</span></span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bax (x :: a) = ... -- a is in scope here</span></span>
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<pre style="margin: 0;">-<span id="LC416" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because of HsWC and HsIB pass on their scope to their children</span></span>
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<pre style="margin: 0;">-<span id="LC417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we must wrap the LHsType in pattern signatures in a</span></span>
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<pre style="margin: 0;">-<span id="LC418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Shielded explicitly, so that the HsWC/HsIB scope is not passed</span></span>
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<pre style="margin: 0;">-<span id="LC419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on the the LHsType</span></span>
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<pre style="margin: 0;">-<span id="LC420" 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="LC421" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC422" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Shielded</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SH</span> <span class="kt" style="color: #458; font-weight: 600;">Scope</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- Ignores its TScope, uses its own scope instead</span></span>
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<pre style="margin: 0;">-<span id="LC423" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC424" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">ProtectedSig</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC425" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ProtectedSig</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;">HsWildCardBndrs</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;">HsImplicitBndrs</span></span>
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<pre style="margin: 0;">-<span id="LC426" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">-<span id="LC427" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Shielded</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)))</span></span>
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<pre style="margin: 0;">-<span id="LC428" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ProtectedSig</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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<pre style="margin: 0;">-<span id="LC429" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC430" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">ProtectSig</span> <span class="n" style="color: #333;">a</span> <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;">protectSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Scope</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoGhcTc</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;">ProtectedSig</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC432" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC433" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HasLoc</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;">HasLoc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Shielded</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC434" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SH</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC435" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC436" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ToHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TScoped</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;">ToHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TScoped</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Shielded</span> <span class="n" style="color: #333;">a</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC437" class="line" lang="haskell"> <span class="n" style="color: #333;">toHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TS</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SH</span> <span class="n" style="color: #333;">sc</span> <span class="n" style="color: #333;">a</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">toHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ResolvedScopes</span> <span class="p">[</span><span class="n" style="color: #333;">sc</span><span class="p">])</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC439" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">ProtectSig</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC440" class="line" lang="haskell"> <span class="n" style="color: #333;">protectSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</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="LC441" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC442" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">ProtectSig</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC443" class="line" lang="haskell"> <span class="n" style="color: #333;">protectSig</span> <span class="n" style="color: #333;">sc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">sig</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC444" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="n" style="color: #333;">b</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SH</span> <span class="n" style="color: #333;">sc</span> <span class="n" style="color: #333;">sig</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This case in handled in the instance for HsPatSigType</span></span>
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<pre style="margin: 0;">+<span id="LC418" 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="LC419" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">HasLoc</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</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;">-- ^ defined so that HsImplicitBndrs and HsWildCardBndrs can</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">@@ -770,8 +744,6 @@ instance ( a ~ GhcPass p</td>
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<pre style="margin: 0;"> <span id="LC744" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ToHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RContext</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFields</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PScoped</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="n" style="color: #333;">a</span><span class="p">))))</span></span>
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<pre style="margin: 0;"> <span id="LC745" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ToHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ToHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TScoped</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC773" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ProtectSig</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC774" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ToHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TScoped</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProtectedSig</span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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775
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<pre style="margin: 0;"> <span id="LC747" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HasType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC748" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Data</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSplice</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC749" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">IsPass</span> <span class="n" style="color: #333;">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">@@ -832,9 +804,12 @@ instance ( a ~ GhcPass p</td>
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804
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SigPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">-></span></span>
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833
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805
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">toHie</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">PS</span> <span class="n" style="color: #333;">rsp</span> <span class="n" style="color: #333;">scope</span> <span class="n" style="color: #333;">pscope</span> <span class="n" style="color: #333;">pat</span></span>
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834
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806
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">cscope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLScope</span> <span class="n" style="color: #333;">pat</span> <span class="kr" style="font-weight: 600;">in</span></span>
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835
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<pre style="margin: 0;">-<span id="LC835" class="line" lang="haskell"> <span class="n" style="color: #333;">toHie</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">TS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ResolvedScopes</span> <span class="p">[</span><span class="n" style="color: #333;">cscope</span><span class="p">,</span> <span class="n" style="color: #333;">scope</span><span class="p">,</span> <span class="n" style="color: #333;">pscope</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC836" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">protectSig</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">cscope</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC837" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoping Rules for SigPat]</span></span>
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<pre style="margin: 0;">+<span id="LC807" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ghcPass</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">p</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC808" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC811" class="line" lang="haskell"> <span class="n" style="color: #333;">toHie</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">TS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ResolvedScopes</span> <span class="p">[</span><span class="n" style="color: #333;">cscope</span><span class="p">,</span> <span class="n" style="color: #333;">scope</span><span class="p">,</span> <span class="n" style="color: #333;">pscope</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC812" class="line" lang="haskell"> <span class="n" style="color: #333;">sig</span></span>
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838
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813
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<pre style="margin: 0;"> <span id="LC813" class="line" lang="haskell"> <span class="p">]</span></span>
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839
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814
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XPat</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ghcPass</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">p</span> <span class="kr" style="font-weight: 600;">of</span></span>
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840
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815
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<pre style="margin: 0;"> <span id="LC815" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">811</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">@@ -856,6 +831,13 @@ instance ( a ~ GhcPass p</td>
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856
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831
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">spn</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsRecField</span> <span class="n" style="color: #333;">lbl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PS</span> <span class="n" style="color: #333;">rsp</span> <span class="n" style="color: #333;">scope</span> <span class="n" style="color: #333;">fscope</span> <span class="n" style="color: #333;">pat</span><span class="p">)</span> <span class="n" style="color: #333;">pun</span></span>
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857
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832
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"> <span class="n" style="color: #333;">scoped_fds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listScopes</span> <span class="n" style="color: #333;">pscope</span> <span class="n" style="color: #333;">fds</span></span>
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858
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833
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"></span>
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834
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">ToHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TScoped</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 class="kr" style="font-weight: 600;">where</span></span>
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835
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"> <span class="n" style="color: #333;">toHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TS</span> <span class="n" style="color: #333;">sc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsPS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsPSRn</span> <span class="n" style="color: #333;">wcs</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="n" style="color: #333;">body</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">span</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;">concatM</span> <span class="o" style="font-weight: 600;">$</span></span>
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836
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">bindingsOnly</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarBind</span> <span class="p">(</span><span class="n" style="color: #333;">mkScope</span> <span class="n" style="color: #333;">span</span><span class="p">)</span> <span class="n" style="color: #333;">sc</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</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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837
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">toHie</span> <span class="n" style="color: #333;">body</span></span>
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838
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Scoping Rules for SigPat]</span></span>
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"></span>
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841
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ToHie</span> <span class="n" style="color: #333;">body</span></span>
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860
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842
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ToHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LGRHS</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ToHie</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RScoped</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsLocalBinds</span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#446cb12ca6cefaf1c6eb79b7db643632744263c7"><strong>compiler/GHC/Parser/PostProcess.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">@@ -874,7 +874,7 @@ mkRuleBndrs :: [LRuleTyTmVar] -> [LRuleBndr GhcPs]</td>
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="haskell"><span class="n" style="color: #333;">mkRuleBndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fmap</span> <span class="p">(</span><span class="n" style="color: #333;">fmap</span> <span class="n" style="color: #333;">cvt_one</span><span class="p">)</span></span>
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875
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875
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">cvt_one</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleTyTmVar</span> <span class="n" style="color: #333;">v</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RuleBndr</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">v</span></span>
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876
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876
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"> <span class="n" style="color: #333;">cvt_one</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleTyTmVar</span> <span class="n" style="color: #333;">v</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">sig</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span></span>
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877
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RuleBndrSig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">v</span> <span class="p">(</span><span class="n" style="color: #333;">mk<span class="idiff left right">LHsSigWc</span>Type</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RuleBndrSig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">v</span> <span class="p">(</span><span class="n" style="color: #333;">mk<span class="idiff left right">HsPatSig</span>Type</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- turns RuleTyTmVars into HsTyVarBndrs - this is more interesting</span></span>
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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"><span class="n" style="color: #333;">mkRuleTyVarBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LRuleTyTmVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</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">@@ -2033,7 +2033,7 @@ instance DisambECP (PatBuilder GhcPs) where</td>
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<pre style="margin: 0;"> <span id="LC2033" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsWildCardPV</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatBuilderPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WildPat</span> <span class="n" style="color: #333;">noExtField</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC2034" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsTySigPV</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC2035" class="line" lang="haskell"> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkLPat</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">-<span id="LC2036" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatBuilderPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SigPat</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">p</span> <span class="p">(</span><span class="n" style="color: #333;">mk<span class="idiff left right">LHsSigWc</span>Type</span> <span class="n" style="color: #333;">sig</span><span class="p">)))</span></span>
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<pre style="margin: 0;">+<span id="LC2036" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatBuilderPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SigPat</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">p</span> <span class="p">(</span><span class="n" style="color: #333;">mk<span class="idiff left right">HsPatSig</span>Type</span> <span class="n" style="color: #333;">sig</span><span class="p">)))</span></span>
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<pre style="margin: 0;"> <span id="LC2037" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsExplicitListPV</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">xs</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="LC2038" class="line" lang="haskell"> <span class="n" style="color: #333;">ps</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">checkLPat</span> <span class="n" style="color: #333;">xs</span></span>
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<pre style="margin: 0;"> <span id="LC2039" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatBuilderPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ListPat</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">ps</span><span class="p">)))</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#af762064d779f7308dd415966c974f27d14f9943"><strong>compiler/GHC/Rename/Bind.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">@@ -955,7 +955,7 @@ renameSig _ (IdSig _ x)</td>
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<pre style="margin: 0;"> <span id="LC955" 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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<pre style="margin: 0;"> <span id="LC956" 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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<pre style="margin: 0;"> <span id="LC957" 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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<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="kt" style="color: #458; font-weight: 600;"><span class="idiff left">BindUnlessForall</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">ty</span></span>
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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="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC959" 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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<pre style="margin: 0;"> <span id="LC960" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC961" 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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#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">@@ -316,7 +316,7 @@ rnExpr (RecordUpd { rupd_expr = expr, rupd_flds = rbinds })</td>
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<pre style="margin: 0;"> <span id="LC316" 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="LC317" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC318" 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="LC319" 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;"><span class="idiff left">BindUnlessForall</span></span><span class="idiff right"> </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="LC319" 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="LC320" 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="LC321" 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="LC322" 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/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#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">@@ -13,7 +13,7 @@ module GHC.Rename.HsType (</td>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">rnHsType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rnLHsType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rnLHsTypes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rnContext</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">rnHsKind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rnLHsKind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rnLHsTypeArgs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">rnHsSigType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rnHsWcType</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsSigWcTypeScoping</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;">rnHsSigWcType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rnHs<span class="idiff left right">SigWcTypeScoped</span></span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsSigWcTypeScoping</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;">rnHsSigWcType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rnHs<span class="idiff left right">PatSigType</span></span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">newTyVarNameRn</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">rnConDeclFields</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">rnLTyVar</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">@@ -71,11 +71,11 @@ import Control.Monad ( unless, when )</td>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC72" 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="LC73" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">These type renamers are in a separate module, rather than in (say) GHC.Rename.Module,</span></span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to break several loop.</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to break several loop<span class="idiff left right">s</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC76" 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="LC77" 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="LC78" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> HsSigWc</span>Type (i.e with wildcards)</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">HsSigWcType and HsPatSig</span>Type (i.e with wildcards)</span></span>
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<pre style="margin: 0;"> <span id="LC79" 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="LC80" 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="LC81" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -85,46 +85,77 @@ data HsSigWcTypeScoping</td>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Always bind any free tyvars of the given type, regardless of whether we</span></span>
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- have a forall at the top.</span></span>
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<pre style="margin: 0;"> <span id="LC87" 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="LC88" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For pattern type sigs<span class="idiff left right"> and rules</span> we /do/ want to bring those type</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For pattern type sigs<span class="idiff left right">,</span> we /do/ want to bring those type</span></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- variables into scope, even if there's a forall at the top which usually</span></span>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- stops that happening, e.g:</span></span>
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<pre style="margin: 0;"> <span id="LC91" 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="LC92" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- > \ (x :: forall a. a-> b) -> e</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- > \ (x :: forall a. a<span class="idiff left right"> </span>-> b) -> e</span></span>
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<pre style="margin: 0;"> <span id="LC93" 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="LC94" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Here we do bring 'b' into scope.</span></span>
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<pre style="margin: 0;">+<span id="LC95" 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="LC96" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- RULES can also use 'AlwaysBind', such as in the following example:</span></span>
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<pre style="margin: 0;">+<span id="LC97" 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="LC98" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- > {-# RULES \"f\" forall (x :: forall a. a -> b). f x = ... b ... #-}</span></span>
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<pre style="margin: 0;">+<span id="LC99" 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="LC100" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This only applies to RULES that do not explicitly bind their type</span></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- variables. If a RULE explicitly quantifies its type variables, then</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'NeverBind' is used instead. See also</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @Note [Pattern signature binders and scoping]@ in "GHC.Hs.Types".</span></span>
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">BindUnlessForall</span></span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Unless there's forall at the top, do the same thing as 'AlwaysBind'</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Unless there's forall at the top, do the same thing as 'AlwaysBind'.</span></span>
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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is only ever used in places where the \"@forall@-or-nothing\" rule</span></span>
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107
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is in effect. See @Note [forall-or-nothing rule]@.</span></span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">NeverBind</span></span>
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98
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Never bind any free tyvars</span></span>
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99
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"></span>
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100
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<pre style="margin: 0;">-<span id="LC100" 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;">HsSigWcTypeScoping</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;">LHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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109
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Never bind any free tyvars. This is used for RULES that have both</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- explicit type and term variable binders, e.g.:</span></span>
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<pre style="margin: 0;">+<span id="LC111" 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="LC112" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- > {-# RULES \"const\" forall a. forall (x :: a) y. const x y = x #-}</span></span>
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113
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<pre style="margin: 0;">+<span id="LC113" 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="LC114" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The presence of the type variable binder @forall a.@ implies that the</span></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- free variables in the types of the term variable binders @x@ and @y@</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- are /not/ bound. In the example above, there are no such free variables,</span></span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but if the user had written @(y :: b)@ instead of @y@ in the term</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- variable binders, then @b@ would be rejected for being out of scope.</span></span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also @Note [Pattern signature binders and scoping]@ in</span></span>
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120
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- "GHC.Hs.Types".</span></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC122" 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 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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101
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<pre style="margin: 0;"> <span id="LC123" 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="LC102" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigWcType</span> <span class="n" style="color: #333;">scoping</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">sig_ty</span></span>
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103
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<pre style="margin: 0;">-<span id="LC103" 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="n" style="color: #333;">scoping</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">sig_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;">sig_ty'</span> <span class="o" style="font-weight: 600;">-></span></span>
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104
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">sig_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">emptyFVs</span><span class="p">)</span></span>
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105
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<pre style="margin: 0;">-<span id="LC105" class="line" lang="haskell"></span>
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106
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<pre style="margin: 0;">-<span id="LC106" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigWcTypeScoped</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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107
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<pre style="margin: 0;">-<span id="LC107" 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="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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108
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<pre style="margin: 0;">-<span id="LC108" 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;">LHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">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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109
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<pre style="margin: 0;">-<span id="LC109" 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="LC124" 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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125
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<pre style="margin: 0;">+<span id="LC125" 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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126
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<pre style="margin: 0;">+<span id="LC126" 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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127
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<pre style="margin: 0;">+<span id="LC127" 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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128
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<pre style="margin: 0;">+<span id="LC128" 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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129
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"></span>
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130
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<pre style="margin: 0;">+<span id="LC130" 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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131
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<pre style="margin: 0;">+<span id="LC131" 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="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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132
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<pre style="margin: 0;">+<span id="LC132" 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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133
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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="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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110
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134
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used for</span></span>
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111
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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - Signatures on binders in a RULE</span></span>
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112
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - Pattern type signatures</span></span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - Pattern type signatures, which are only allowed with ScopedTypeVariables</span></span>
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136
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - Signatures on binders in a RULE, which are allowed even if</span></span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ScopedTypeVariables isn't enabled</span></span>
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113
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138
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Wildcards are allowed</span></span>
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114
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<pre style="margin: 0;">-<span id="LC114" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type signatures on binders only allowed with ScopedTypeVariables</span></span>
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<pre style="margin: 0;">-<span id="LC115" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigWcTypeScoped</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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139
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<pre style="margin: 0;">+<span id="LC139" 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="LC140" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Pattern signature binders and scoping] in GHC.Hs.Types</span></span>
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<pre style="margin: 0;">+<span id="LC141" 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="LC142" 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="LC117" 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;">unexpectedTypeSigErr</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="LC118" 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;">sig_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">-<span id="LC119" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC120" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC121" 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="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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122
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<pre style="margin: 0;">-<span id="LC122" 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;">LHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">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="LC143" 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="LC144" 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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<pre style="margin: 0;">+<span id="LC145" 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="LC146" 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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<pre style="margin: 0;">+<span id="LC147" 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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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">sig_ty'</span></span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC151" 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="LC152" 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="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="LC153" 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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<pre style="margin: 0;">+<span id="LC154" 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="LC155" 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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<pre style="margin: 0;">+<span id="LC156" 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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123
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157
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<pre style="margin: 0;"> <span id="LC157" 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="LC124" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- rn_hs_sig_wc_type is used for source-language type signatures</span></span>
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125
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<pre style="margin: 0;">-<span id="LC125" 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>
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126
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<pre style="margin: 0;">-<span id="LC126" class="line" lang="haskell"> <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="LC127" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC158" 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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128
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159
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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="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;">extractFilteredRdrTyVarsDups</span> <span class="n" style="color: #333;">hs_ty</span></span>
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129
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160
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<pre style="margin: 0;"> <span id="LC160" 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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161
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<pre style="margin: 0;"> <span id="LC161" 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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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="165" 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">@@ -134,10 +165,7 @@ rn_hs_sig_wc_type scoping ctxt</td>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NeverBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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166
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">vars</span> <span class="o" style="font-weight: 600;">-></span></span>
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167
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hs_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnWcBody</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">nwc_rdrs</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC137" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">sig_ty'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="p">{</span> <span class="n" style="color: #333;">hswc_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hswc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ib_ty'</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="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;">vars</span></span>
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<td class="diff-line-num old old_line" data-linenumber="139" 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">
139
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty'</span> <span class="p">}</span></span>
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140
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<pre style="margin: 0;">-<span id="LC140" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">sig_ty'</span></span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">wcs</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">hs_ty'</span></span>
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141
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169
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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170
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"></span>
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171
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsWcType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -321,8 +349,9 @@ rnHsSigType ctx level (HsIB { hsib_body = hs_ty })</td>
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321
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349
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- therefore an indication that the user is trying to be fastidious, so</span></span>
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322
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we don't implicitly bind any variables.</span></span>
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351
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="haskell"><span class="cd">-- | See note Note [forall-or-nothing rule]. This tiny little function is used</span></span>
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325
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (rather than its small body inlined) to indicate we implementing that rule.</span></span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"><span class="cd">-- | See Note [forall-or-nothing rule]. This tiny little function is used</span></span>
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353
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (rather than its small body inlined) to indicate that we are implementing</span></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that rule.</span></span>
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell"><span class="n" style="color: #333;">forAllOrNothing</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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327
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356
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<pre style="margin: 0;"> <span id="LC356" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ True <=> explicit forall</span></span>
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357
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- E.g. f :: forall a. a->b</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">@@ -1396,8 +1425,8 @@ ppr_opfix (op, fixity) = pp_op <+> brackets (ppr fixity)</td>
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1396
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1425
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<pre style="margin: 0;"> <span id="LC1425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1397
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1426
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<pre style="margin: 0;"> <span id="LC1426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">***************************************************** -}</span></span>
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1398
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1427
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<pre style="margin: 0;"> <span id="LC1427" class="line" lang="haskell"></span>
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1399
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<pre style="margin: 0;">-<span id="LC1399" class="line" lang="haskell"><span class="n" style="color: #333;">unexpected<span class="idiff left">TypeSigErr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">LHsSigWc</span>Type</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;">SDoc</span></span>
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1400
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<pre style="margin: 0;">-<span id="LC1400" class="line" lang="haskell"><span class="n" style="color: #333;">unexpected<span class="idiff left right">TypeSig</span>Err</span> <span class="n" style="color: #333;">ty</span></span>
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1428
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<pre style="margin: 0;">+<span id="LC1428" class="line" lang="haskell"><span class="n" style="color: #333;">unexpected<span class="idiff left">PatSigTypeErr</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">HsPatSig</span>Type</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;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC1429" class="line" lang="haskell"><span class="n" style="color: #333;">unexpected<span class="idiff left right">PatSigType</span>Err</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1430" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal type signature:"</span> <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;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC1431" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Type signatures are only allowed in patterns with ScopedTypeVariables"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1432" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#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">@@ -957,7 +957,7 @@ rnSrcDerivDecl (DerivDecl _ ty mds overlap)</td>
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<pre style="margin: 0;"> <span id="LC957" 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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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;">mds'</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>
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959
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<pre style="margin: 0;"> <span id="LC959" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLDerivStrategy</span> <span class="kt" style="color: #458; font-weight: 600;">DerivDeclCtx</span> <span class="n" style="color: #333;">mds</span> <span class="o" style="font-weight: 600;">$</span></span>
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960
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<pre style="margin: 0;">-<span id="LC960" class="line" lang="haskell"> <span class="n" style="color: #333;">rnHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">BindUnlessForall</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">DerivDeclCtx</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"> <span class="n" style="color: #333;">rnHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">DerivDeclCtx</span> <span class="n" style="color: #333;">ty</span></span>
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961
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<pre style="margin: 0;"> <span id="LC961" 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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962
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<pre style="margin: 0;"> <span id="LC962" 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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963
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<pre style="margin: 0;"> <span id="LC963" 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">@@ -1028,7 +1028,7 @@ bindRuleTmVars doc tyvs vars names thing_inside</td>
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1028
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1028
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<pre style="margin: 0;"> <span id="LC1028" class="line" lang="haskell"></span>
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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;">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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1030
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1030
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<pre style="margin: 0;"> <span id="LC1030" 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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1031
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<pre style="margin: 0;">-<span id="LC1031" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rnHs<span class="idiff left right">SigWcTypeScoped</span></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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<pre style="margin: 0;">+<span id="LC1031" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rnHs<span class="idiff left right">PatSigType</span></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;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">bsig'</span> <span class="o" style="font-weight: 600;">-></span></span>
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1032
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1032
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">ns</span> <span class="o" style="font-weight: 600;">$</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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<pre style="margin: 0;"> <span id="LC1033" 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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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#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">@@ -218,9 +218,6 @@ matchNameMaker ctxt = LamMk report_unused</td>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ThPatQuote</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC219" 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;">True</span></span>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigCps</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span 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;">LHsSigWcType</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="LC222" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigCps</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;">rnHsSigWcTypeScoped</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="LC223" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"><span class="n" style="color: #333;">newPatLName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NameMaker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CpsRn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"><span class="n" style="color: #333;">newPatLName</span> <span class="n" style="color: #333;">name_maker</span> <span class="n" style="color: #333;">rdr_name</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC223" 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;">newPatName</span> <span class="n" style="color: #333;">name_maker</span> <span class="n" style="color: #333;">rdr_name</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">@@ -410,9 +407,12 @@ rnPatAndThen mk (SigPat x pat sig)</td>
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- f ((Just (x :: a) :: Maybe a)</span></span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~^ `a' is first bound here</span></span>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ~~~~~~~~~~~~~~~^ the same `a' then used here</span></span>
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<pre style="margin: 0;">-<span id="LC413" 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;">sig'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHs<span class="idiff left right">SigCps</span></span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;">+<span id="LC410" 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;">sig'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHs<span class="idiff left right">PatSigTypeAndThen</span></span> <span class="n" style="color: #333;">sig</span></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">pat'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLPatAndThen</span> <span class="n" style="color: #333;">mk</span> <span class="n" style="color: #333;">pat</span></span>
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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="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/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3338,7 +3338,7 @@ Result works fine, but it may eventually bite us.</td>
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<pre style="margin: 0;"> <span id="LC3338" 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="LC3339" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3340" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsPatSigType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span></span>
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<pre style="margin: 0;">-<span id="LC3341" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">LHsSigWc</span>Type</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="c1" style="color: #998; font-style: italic;">-- The type signature</span></span>
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<pre style="margin: 0;">+<span id="LC3341" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">HsPatSig</span>Type</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="c1" style="color: #998; font-style: italic;">-- The type signature</span></span>
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<pre style="margin: 0;"> <span id="LC3342" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- Wildcards</span></span>
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<pre style="margin: 0;"> <span id="LC3343" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- The new bit of type environment, binding</span></span>
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<pre style="margin: 0;"> <span id="LC3344" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the scoped type variables</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">@@ -3346,13 +3346,13 @@ tcHsPatSigType :: UserTypeCtxt</td>
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<pre style="margin: 0;"> <span id="LC3346" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used for type-checking type signatures in</span></span>
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<pre style="margin: 0;"> <span id="LC3347" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) patterns e.g f (x::Int) = e</span></span>
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<pre style="margin: 0;"> <span id="LC3348" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (b) RULE forall bndrs e.g. forall (x::Int). f x = x</span></span>
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<pre style="margin: 0;">+<span id="LC3349" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Pattern signature binders and scoping] in GHC.Hs.Types</span></span>
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<pre style="margin: 0;"> <span id="LC3350" 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="LC3351" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This may emit constraints</span></span>
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<pre style="margin: 0;"> <span id="LC3352" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Recipe for checking a signature]</span></span>
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<pre style="margin: 0;">-<span id="LC3352" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsPatSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;">-<span id="LC3353" class="line" lang="haskell"> <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;">sig_wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hswc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ib_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;">-<span id="LC3354" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_ns</span></span>
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<pre style="margin: 0;">-<span id="LC3355" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ib_ty</span></span>
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<pre style="margin: 0;">+<span id="LC3353" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsPatSigType</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;">+<span id="LC3354" class="line" lang="haskell"> <span class="p">(</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="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;">sig_wcs</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;">sig_ns</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC3355" class="line" lang="haskell"> <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;">hs_ty</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC3356" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addSigCtxt</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC3357" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_tkv_prs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">new_implicit_tv</span> <span class="n" style="color: #333;">sig_ns</span></span>
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<pre style="margin: 0;"> <span id="LC3358" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_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">@@ -3385,12 +3385,12 @@ tcHsPatSigType ctxt sig_ty</td>
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<pre style="margin: 0;"> <span id="LC3385" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ctxt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC3386" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RuleSigCtxt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">newSkolemTyVar</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;"> <span id="LC3387" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">newPatSigTyVar</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;">-<span id="LC3388" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">P</span>attern signature binders]</span></span>
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<pre style="margin: 0;">+<span id="LC3388" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Typechecking p</span>attern signature binders]</span></span>
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<pre style="margin: 0;"> <span id="LC3389" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: tv's Name may be fresh (in the case of newPatSigTyVar)</span></span>
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<pre style="margin: 0;"> <span id="LC3390" 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;">name</span><span class="p">,</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC3391" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [<span class="idiff left right">P</span>attern signature binders]</span></span>
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<pre style="margin: 0;">-<span id="LC3393" 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="LC3392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [<span class="idiff left right">Typechecking p</span>attern signature binders]</span></span>
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<pre style="margin: 0;">+<span id="LC3393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<span class="idiff left right">~~~~~~~~~~~~~</span></span></span>
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<pre style="margin: 0;"> <span id="LC3394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Type variables in the type environment] in GHC.Tc.Utils.</span></span>
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<pre style="margin: 0;"> <span id="LC3395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;"> <span id="LC3396" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#3ee8be814b6c6727880deab3772e6af922524bf0"><strong>compiler/GHC/Tc/Gen/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">@@ -690,7 +690,7 @@ because they won't be in scope when we do the desugaring</td>
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<pre style="margin: 0;"> <span id="LC690" 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="LC691" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="haskell"><span class="n" style="color: #333;">tcPatSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <=> pattern binding</span></span>
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">LHsSigWc</span>Type</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">HsPatSig</span>Type</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpSigmaType</span></span>
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<pre style="margin: 0;"> <span id="LC695" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- The type to use for "inside" the signature</span></span>
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<pre style="margin: 0;"> <span id="LC696" class="line" lang="haskell"> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)],</span> <span class="c1" style="color: #998; font-style: italic;">-- The new bit of type environment, binding</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#04338da99bccd89402218ca19c5724762f0fe641"><strong>compiler/GHC/Tc/Gen/Rule.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">@@ -230,7 +230,7 @@ tcRuleTmBndrs (L _ (RuleBndrSig _ (L _ name) rn_ty) : rule_bndrs)</td>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RuleSigCtxt</span> <span class="n" style="color: #333;">name</span></span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span> <span class="p">,</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">id_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsPatSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">rn_ty</span></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLocalId</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">id_ty</span></span>
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<pre style="margin: 0;">-<span id="LC233" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">P</span>attern signature binders] in GHC.Tc.Gen.HsType</span></span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Typechecking p</span>attern signature binders] in GHC.Tc.Gen.HsType</span></span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The type variables scope over subsequent bindings; yuk</span></span>
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tyvars</span><span class="p">,</span> <span class="n" style="color: #333;">tmvars</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcExtendNameTyVarEnv</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#2eac51f9871ca0c0698aa1fc7f79c05ef8fc4a49"><strong>compiler/GHC/ThToHs.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">@@ -830,7 +830,7 @@ cvtRuleBndr (RuleVar n)</td>
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"><span class="n" style="color: #333;">cvtRuleBndr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypedRuleVar</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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831
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<pre style="margin: 0;"> <span id="LC831" 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;">n'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">vNameL</span> <span class="n" style="color: #333;">n</span></span>
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832
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832
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cvtType</span> <span class="n" style="color: #333;">ty</span></span>
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833
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<pre style="margin: 0;">-<span id="LC833" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Hs</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">RuleBndrSig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">n'</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mk<span class="idiff left right">LHsSigWc</span>Type</span> <span class="n" style="color: #333;">ty'</span> <span class="p">}</span></span>
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833
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Hs</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">RuleBndrSig</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">n'</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mk<span class="idiff left right">HsPatSig</span>Type</span> <span class="n" style="color: #333;">ty'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"></span>
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835
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Declarations</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">@@ -1307,7 +1307,7 @@ cvtp (ListP ps) = do { ps' <- cvtPats ps</td>
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<pre style="margin: 0;"> <span id="LC1307" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span></span>
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<pre style="margin: 0;"> <span id="LC1308" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">ListPat</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">ps'</span><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1309" class="line" lang="haskell"><span class="n" style="color: #333;">cvtp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SigP</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">p'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cvtPat</span> <span class="n" style="color: #333;">p</span><span class="p">;</span> <span class="n" style="color: #333;">t'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cvtType</span> <span class="n" style="color: #333;">t</span></span>
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<pre style="margin: 0;">-<span id="LC1310" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">SigPat</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">p'</span> <span class="p">(</span><span class="n" style="color: #333;">mk<span class="idiff left right">LHsSigWc</span>Type</span> <span class="n" style="color: #333;">t'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1310" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">SigPat</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">p'</span> <span class="p">(</span><span class="n" style="color: #333;">mk<span class="idiff left right">HsPatSig</span>Type</span> <span class="n" style="color: #333;">t'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1311" class="line" lang="haskell"><span class="n" style="color: #333;">cvtp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ViewP</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">e'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cvtl</span> <span class="n" style="color: #333;">e</span><span class="p">;</span> <span class="n" style="color: #333;">p'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cvtPat</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;"> <span id="LC1312" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">ViewPat</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">e'</span> <span class="n" style="color: #333;">p'</span><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1313" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/102cfd6784d16a0d0cc8bdf42d4de4c7b8dd0190#62a9ebd99858aa7fc936319bea9fdd9a6954ba63"><strong>testsuite/tests/hiefile/should_compile/hie007.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">@@ -64,3 +64,6 @@ thud f x =</td>
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64
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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66
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="n" style="color: #333;">rankn</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a1</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a1</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="n" style="color: #333;">rankn</span> <span class="p">(</span><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a1</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a1</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span></span></pre>
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