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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/82cb8913b38d44ef20e928ff8b08f3f0770ebf80">82cb8913</a></strong>
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<span>by John Ericson</span>
<i>at 2020-05-23T13:38:32-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18145 and also avoid needless work with implicit vars
- `forAllOrNothing` now is monadic, so we can trace whether we bind
an explicit `forall` or not.
- #18145 arose because the free vars calculation was needlessly
complex. It is now greatly simplified.
- Replaced some other implicit var code with `filterFreeVarsToBind`.
Co-authored-by: Ryan Scott <ryan.gl.scott@gmail.com>
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<h4>5 changed files:</h4>
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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="#b360ba1f36c718ac27feddbbd33e869a1fe379dd">
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+
testsuite/tests/rename/should_fail/T18145.hs
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<a href="#79c08f251e33b53a33c4411a94cd5679acc9406f">
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+
testsuite/tests/rename/should_fail/T18145.stderr
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<li class="file-stats">
<a href="#c2554d4efde41e6e193f728122336449d2cb5fc5">
testsuite/tests/rename/should_fail/all.T
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<h4>Changes:</h4>
<li id="892acbb198a9095c917740d3c1297b56df4e3b7e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82cb8913b38d44ef20e928ff8b08f3f0770ebf80#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">@@ -29,7 +29,7 @@ module GHC.Rename.HsType (</td>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractHsTysRdrTyVarsDups</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractRdrKindSigVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractDataDefnKindVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">extractHsTvBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extractHsTyArgRdrKiTyVarsDup</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">forAllOrNothing</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nubL</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">elemRdr</span></span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">forAllOrNothing</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nubL</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="65" 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="65" 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">@@ -65,7 +65,7 @@ import GHC.Data.FastString</td>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">nubBy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">partition</span><span class="p">,</span> <span class="p"><span class="idiff left">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">\\</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">find</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">nubBy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">partition</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">find</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">unless</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">when</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -164,13 +164,13 @@ rn_hs_sig_wc_type :: HsSigWcTypeScoping -> HsDocContext -> Maybe SDoc</td>
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<pre style="margin: 0;"> <span id="LC164" 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="LC165" class="line" lang="haskell"><span class="n" style="color: #333;">rn_hs_sig_wc_type</span> <span class="n" style="color: #333;">scoping</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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166
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166
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">check_inferred_vars</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">hs_ty</span></span>
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167
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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">free_vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">extractFilteredRdrTyVarsDups</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hs_ty</span></span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">free_vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">filterInScopeM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">extractHsTyRdrTyVarsDups</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_ty</span></span><span class="p"><span class="idiff right">)</span></span></span>
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168
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">nwc_rdrs'</span><span class="p">,</span> <span class="n" style="color: #333;">tv_rdrs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">partition_nwcs</span> <span class="n" style="color: #333;">free_vars</span></span>
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169
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169
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<pre style="margin: 0;"> <span id="LC169" 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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170
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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">implicit_bndrs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">=</span></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">scoping</span> <span class="kr" style="font-weight: 600;">of</span></span>
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171
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AlwaysBind</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="n" style="color: #333;">tv_rdrs</span></span>
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172
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="kt" style="color: #458; font-weight: 600;">BindUnlessForall</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isLHsForAllTy</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span> <span class="n" style="color: #333;">tv_rdrs</span></span>
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173
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NeverBind</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"> <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">implicit_bndrs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right"><-</span></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">scoping</span> <span class="kr" style="font-weight: 600;">of</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">AlwaysBind</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pure</span></span> <span class="n" style="color: #333;">tv_rdrs</span></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BindUnlessForall</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isLHsForAllTy</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span> <span class="n" style="color: #333;">tv_rdrs</span></span>
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NeverBind</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pure</span></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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174
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174
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">vars</span> <span class="o" style="font-weight: 600;">-></span></span>
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175
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175
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hs_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnWcBody</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">nwc_rdrs</span> <span class="n" style="color: #333;">hs_ty</span></span>
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176
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176
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<pre style="margin: 0;"> <span id="LC176" 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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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="178" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -178,7 +178,7 @@ rn_hs_sig_wc_type scoping ctxt inf_err hs_ty thing_inside</td>
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178
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178
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsWcType</span> <span class="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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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsWcType</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="p">{</span> <span class="n" style="color: #333;">hswc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">})</span></span>
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181
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<pre style="margin: 0;">-<span id="LC181" 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;"><span class="idiff left">extractFilteredRdrTyVars</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hs_ty</span></span></span>
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<pre style="margin: 0;">+<span id="LC181" 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;"><span class="idiff left">filterInScopeM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">extractHsTyRdrTyVars</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hs_ty</span></span><span class="p"><span class="idiff right">)</span></span></span>
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182
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182
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">nwc_rdrs</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">partition_nwcs</span> <span class="n" style="color: #333;">free_vars</span></span>
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183
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183
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hs_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnWcBody</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">nwc_rdrs</span> <span class="n" style="color: #333;">hs_ty</span></span>
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184
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184
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">sig_ty'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="p">{</span> <span class="n" style="color: #333;">hswc_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hswc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty'</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -278,22 +278,6 @@ extraConstraintWildCardsAllowed env</td>
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSigCtx</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wildcards in standalone kind signatures] in GHC/Hs/Decls</span></span>
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<pre style="margin: 0;"> <span id="LC279" 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;">False</span></span>
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC281" class="line" lang="haskell"><span class="cd">-- | Finds free type and kind variables in a type,</span></span>
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<pre style="margin: 0;">-<span id="LC282" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- without duplicates, and</span></span>
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<pre style="margin: 0;">-<span id="LC283" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- without variables that are already in scope in LocalRdrEnv</span></span>
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<pre style="margin: 0;">-<span id="LC284" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: this includes named wildcards, which look like perfectly</span></span>
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<pre style="margin: 0;">-<span id="LC285" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ordinary type variables at this point</span></span>
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<pre style="margin: 0;">-<span id="LC286" class="line" lang="haskell"><span class="n" style="color: #333;">extractFilteredRdrTyVars</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;">RnM</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsNoDups</span></span>
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<pre style="margin: 0;">-<span id="LC287" class="line" lang="haskell"><span class="n" style="color: #333;">extractFilteredRdrTyVars</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterInScopeM</span> <span class="p">(</span><span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC288" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC289" class="line" lang="haskell"><span class="cd">-- | Finds free type and kind variables in a type,</span></span>
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with duplicates, but</span></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- without variables that are already in scope in LocalRdrEnv</span></span>
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<pre style="margin: 0;">-<span id="LC292" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: this includes named wildcards, which look like perfectly</span></span>
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<pre style="margin: 0;">-<span id="LC293" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ordinary type variables at this point</span></span>
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<pre style="margin: 0;">-<span id="LC294" class="line" lang="haskell"><span class="n" style="color: #333;">extractFilteredRdrTyVarsDups</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;">RnM</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"><span class="n" style="color: #333;">extractFilteredRdrTyVarsDups</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterInScopeM</span> <span class="p">(</span><span class="n" style="color: #333;">extractHsTyRdrTyVarsDups</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="LC296" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC281" class="line" lang="haskell"><span class="cd">-- | When the NamedWildCards extension is enabled, partition_nwcs</span></span>
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- removes type variables that start with an underscore from the</span></span>
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<pre style="margin: 0;"> <span id="LC283" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- FreeKiTyVars in the argument and returns them in a separate list.</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">@@ -340,9 +324,12 @@ rnHsSigType :: HsDocContext</td>
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<pre style="margin: 0;"> <span id="LC324" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that cannot have wildcards</span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">level</span> <span class="n" style="color: #333;">inf_err</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC326" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"rnHsSigType"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">vars</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">extractFilteredRdrTyVarsDups</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">hs_ty</span></span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">rdr_env</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">getLocalRdrEnv</span></span></span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">check_inferred_vars</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC345" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="p">(</span><span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isLHsForAllTy</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span> <span class="n" style="color: #333;">vars</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="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="LC329" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">vars0</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isLHsForAllTy</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">filterInScope</span> <span class="n" style="color: #333;">rdr_env</span></span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTyRdrTyVarsDups</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="n" style="color: #333;">vars0</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">vars</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">body'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLHsTyKi</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyKiEnv</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">level</span> <span class="kt" style="color: #458; font-weight: 600;">RnTypeBody</span><span class="p">)</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vars</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -361,7 +348,7 @@ rnHsSigType ctx level inf_err (HsIB { hsib_body = hs_ty })</td>
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<pre style="margin: 0;"> <span id="LC348" 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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<pre style="margin: 0;"> <span id="LC349" 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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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC364" class="line" lang="haskell"><span class="cd">-- | See <span class="idiff left right">Note [forall-or-nothing rule]</span>. This tiny little function is used</span></span>
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="haskell"><span class="cd">-- | See <span class="idiff left right">@Note [forall-or-nothing rule]@</span>. This tiny little function is used</span></span>
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<pre style="margin: 0;"> <span id="LC352" 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="LC353" 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="LC354" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -372,10 +359,14 @@ forAllOrNothing :: Bool</td>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we want to bring both 'a' and 'b' into scope, hence False</span></span>
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Free vars of the type</span></span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;">-<span id="LC376" class="line" lang="haskell"><span class="n" style="color: #333;">forAllOrNothing</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"><span class="n" style="color: #333;">forAllOrNothing</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvs</span></span>
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<pre style="margin: 0;">-<span id="LC378" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="haskell"><span class="n" style="color: #333;">forAllOrNothing</span> <span class="n" style="color: #333;">has_outer_forall</span> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">has_outer_forall</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"forAllOrNothing"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"has explicit outer forall"</span></span>
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366
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"> <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="LC367" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</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="LC368" class="line" lang="haskell"> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"forAllOrNothing"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"no explicit forall. implicit binders:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fvs</span></span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">fvs</span></span>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC371" class="line" lang="haskell"><span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Surface-syntax free vars that we will implicitly bind.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -878,21 +869,20 @@ bindHsQTyVars doc mb_in_doc mb_assoc body_kv_occs hsq_bndrs thing_inside</td>
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [bindHsQTyVars examples] for what</span></span>
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- all these various things are doing</span></span>
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">kv_occs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">implicit_kvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">implicit_kvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC873" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">hsLTyVarLocName</span> <span class="n" style="color: #333;">hs_tv_bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC883" class="line" lang="haskell"> <span class="n" style="color: #333;">kv_occs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nubL</span> <span class="p">(</span><span class="n" style="color: #333;">bndr_kv_occs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">body_kv_occs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC884" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make sure to list the binder kvs before the</span></span>
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<pre style="margin: 0;">-<span id="LC885" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- body kvs, as mandated by</span></span>
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<pre style="margin: 0;">-<span id="LC886" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Ordering of implicit variables]</span></span>
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<pre style="margin: 0;">-<span id="LC887" class="line" lang="haskell"> <span class="n" style="color: #333;">implicit_kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter_occs</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">kv_occs</span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"> <span class="n" style="color: #333;">implicit_kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nubL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">filterFreeVarsToBind</span> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr_kv_occs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">body_kv_occs</span></span>
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"> <span class="n" style="color: #333;">del</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">deleteBys</span> <span class="n" style="color: #333;">eqLocated</span></span>
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<pre style="margin: 0;">-<span id="LC889" class="line" lang="haskell"> <span class="n" style="color: #333;">all_bound_on_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">null</span> <span class="p">((</span><span class="n" style="color: #333;">body_kv_occs</span> <span class="p">`</span><span class="n" style="color: #333;">del</span><span class="p">`</span> <span class="n" style="color: #333;">bndrs</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">del</span><span class="p">`</span> <span class="n" style="color: #333;">bndr_kv_occs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"> <span class="n" style="color: #333;">body_remaining</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">body_kv_occs</span> <span class="p">`</span><span class="n" style="color: #333;">del</span><span class="p">`</span> <span class="n" style="color: #333;">bndrs</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">del</span><span class="p">`</span> <span class="n" style="color: #333;">bndr_kv_occs</span></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"> <span class="n" style="color: #333;">all_bound_on_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">body_remaining</span></span>
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879
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"></span>
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880
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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"checkMixedVars3"</span> <span class="o" style="font-weight: 600;">$</span></span>
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892
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<pre style="margin: 0;">-<span id="LC892" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"kv_occs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">kv_occs</span></span>
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893
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<pre style="margin: 0;">-<span id="LC893" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"bndrs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_tv_bndrs</span></span>
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881
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"bndrs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_tv_bndrs</span></span>
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882
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"bndr_kv_occs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">bndr_kv_occs</span></span>
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<pre style="margin: 0;">-<span id="LC895" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"wubble"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">((</span><span class="n" style="color: #333;">kv_occs</span> <span class="o" style="font-weight: 600;">\\</span> <span class="n" style="color: #333;">bndrs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">\\</span> <span class="n" style="color: #333;">bndr_kv_occs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"body_kv_occs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">body_kv_occs</span></span>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"implicit_kvs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implicit_kvs</span></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"body_remaining"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">body_remaining</span></span>
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886
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<pre style="margin: 0;"> <span id="LC886" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC887" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC888" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">implicit_kv_nms</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newTyVarNameRn</span> <span class="n" style="color: #333;">mb_assoc</span><span class="p">)</span> <span class="n" style="color: #333;">implicit_kvs</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -904,17 +894,6 @@ bindHsQTyVars doc mb_in_doc mb_assoc body_kv_occs hsq_bndrs thing_inside</td>
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<pre style="margin: 0;"> <span id="LC894" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsq_explicit</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rn_bndrs</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC895" class="line" lang="haskell"> <span class="n" style="color: #333;">all_bound_on_lhs</span> <span class="p">}</span> <span class="p">}</span></span>
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896
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<pre style="margin: 0;"> <span id="LC896" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC907" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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908
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<pre style="margin: 0;">-<span id="LC908" class="line" lang="haskell"> <span class="n" style="color: #333;">filter_occs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Bound here</span></span>
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909
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<pre style="margin: 0;">-<span id="LC909" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Potential implicit binders</span></span>
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910
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<pre style="margin: 0;">-<span id="LC910" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Final implicit binders</span></span>
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911
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<pre style="margin: 0;">-<span id="LC911" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Filter out any potential implicit binders that are either</span></span>
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912
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<pre style="margin: 0;">-<span id="LC912" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- already in scope, or are explicitly bound in the same HsQTyVars</span></span>
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913
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<pre style="margin: 0;">-<span id="LC913" class="line" lang="haskell"> <span class="n" style="color: #333;">filter_occs</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">occs</span></span>
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914
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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterOut</span> <span class="n" style="color: #333;">is_in_scope</span> <span class="n" style="color: #333;">occs</span></span>
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915
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<pre style="margin: 0;">-<span id="LC915" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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916
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<pre style="margin: 0;">-<span id="LC916" class="line" lang="haskell"> <span class="n" style="color: #333;">is_in_scope</span> <span class="n" style="color: #333;">locc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">locc</span> <span class="p">`</span><span class="n" style="color: #333;">elemRdr</span><span class="p">`</span> <span class="n" style="color: #333;">bndrs</span></span>
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917
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [bindHsQTyVars examples]</span></span>
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919
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898
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<pre style="margin: 0;"> <span id="LC898" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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899
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<pre style="margin: 0;"> <span id="LC899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we have</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -943,7 +922,7 @@ Then:</td>
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943
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922
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Order is not important in these lists. All we are doing is</span></span>
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944
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923
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<pre style="margin: 0;"> <span id="LC923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bring Names into scope.</span></span>
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945
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924
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<pre style="margin: 0;"> <span id="LC924" class="line" lang="haskell"></span>
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946
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Finally, you may wonder why filter<span class="idiff left right">_occs</span> removes in-scope variables</span></span>
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925
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<pre style="margin: 0;">+<span id="LC925" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Finally, you may wonder why filter<span class="idiff left right">FreeVarsToBind</span> removes in-scope variables</span></span>
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947
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926
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<pre style="margin: 0;"> <span id="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from bndr/body_kv_occs. How can anything be in scope? Answer:</span></span>
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948
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927
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">HsQTyVars is /also/ used (slightly oddly) for Haskell-98 syntax</span></span>
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949
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928
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ConDecls</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">@@ -1654,9 +1633,15 @@ type FreeKiTyVarsWithDups = FreeKiTyVars</td>
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1654
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1633
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<pre style="margin: 0;"> <span id="LC1633" class="line" lang="haskell"><span class="cd">-- | A 'FreeKiTyVars' list that contains no duplicate variables.</span></span>
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1655
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1634
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<pre style="margin: 0;"> <span id="LC1634" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsNoDups</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1656
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1635
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<pre style="margin: 0;"> <span id="LC1635" class="line" lang="haskell"></span>
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1636
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<pre style="margin: 0;">+<span id="LC1636" class="line" lang="haskell"><span class="cd">-- | Filter out any type and kind variables that are already in scope in the</span></span>
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1637
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<pre style="margin: 0;">+<span id="LC1637" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the supplied LocalRdrEnv. Note that this includes named wildcards, which</span></span>
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1638
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<pre style="margin: 0;">+<span id="LC1638" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- look like perfectly ordinary type variables at this point.</span></span>
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1657
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1639
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<pre style="margin: 0;"> <span id="LC1639" class="line" lang="haskell"><span class="n" style="color: #333;">filterInScope</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LocalRdrEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1658
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1640
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<pre style="margin: 0;"> <span id="LC1640" class="line" lang="haskell"><span class="n" style="color: #333;">filterInScope</span> <span class="n" style="color: #333;">rdr_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterOut</span> <span class="p">(</span><span class="n" style="color: #333;">inScope</span> <span class="n" style="color: #333;">rdr_env</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unLoc</span><span class="p">)</span></span>
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1659
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1641
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<pre style="margin: 0;"> <span id="LC1641" class="line" lang="haskell"></span>
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1642
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<pre style="margin: 0;">+<span id="LC1642" class="line" lang="haskell"><span class="cd">-- | Filter out any type and kind variables that are already in scope in the</span></span>
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1643
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<pre style="margin: 0;">+<span id="LC1643" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the environment's LocalRdrEnv. Note that this includes named wildcards,</span></span>
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1644
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<pre style="margin: 0;">+<span id="LC1644" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- which look like perfectly ordinary type variables at this point.</span></span>
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1660
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1645
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<pre style="margin: 0;"> <span id="LC1645" class="line" lang="haskell"><span class="n" style="color: #333;">filterInScopeM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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1661
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1646
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<pre style="margin: 0;"> <span id="LC1646" class="line" lang="haskell"><span class="n" style="color: #333;">filterInScopeM</span> <span class="n" style="color: #333;">vars</span></span>
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1662
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1647
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<pre style="margin: 0;"> <span id="LC1647" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rdr_env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLocalRdrEnv</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1797" 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">@@ -1812,12 +1797,13 @@ extract_hs_tv_bndrs :: [LHsTyVarBndr flag GhcPs]</td>
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1812
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1797
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<pre style="margin: 0;"> <span id="LC1797" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'a' is bound by the forall</span></span>
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1813
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1798
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<pre style="margin: 0;"> <span id="LC1798" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'b' is a free type variable</span></span>
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<pre style="margin: 0;"> <span id="LC1799" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'e' is a free kind variable</span></span>
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<pre style="margin: 0;">-<span id="LC1815" class="line" lang="haskell"><span class="n" style="color: #333;">extract_hs_tv_bndrs</span> <span class="n" style="color: #333;">tv_bndrs</span> <span class="n" style="color: #333;">acc_vars</span> <span class="n" style="color: #333;">body_vars</span></span>
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<pre style="margin: 0;">-<span id="LC1816" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">tv_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">body_vars</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">acc_vars</span></span>
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<pre style="margin: 0;">-<span id="LC1817" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterOut</span> <span class="p">(`</span><span class="n" style="color: #333;">elemRdr</span><span class="p">`</span> <span class="n" style="color: #333;">tv_bndr_rdrs</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">bndr_vars</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">body_vars</span><span class="p">)</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">acc_vars</span></span>
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<pre style="margin: 0;">+<span id="LC1800" class="line" lang="haskell"><span class="n" style="color: #333;">extract_hs_tv_bndrs</span> <span class="n" style="color: #333;">tv_bndrs</span> <span class="n" style="color: #333;">acc_vars</span> <span class="n" style="color: #333;">body_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_vars</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">acc_vars</span></span>
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1801
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<pre style="margin: 0;">+<span id="LC1801" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1802
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<pre style="margin: 0;">+<span id="LC1802" class="line" lang="haskell"> <span class="n" style="color: #333;">new_vars</span></span>
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1803
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<pre style="margin: 0;">+<span id="LC1803" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">tv_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">body_vars</span></span>
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1804
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<pre style="margin: 0;">+<span id="LC1804" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterFreeVarsToBind</span> <span class="n" style="color: #333;">tv_bndr_rdrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">bndr_vars</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">body_vars</span></span>
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1818
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1805
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<pre style="margin: 0;"> <span id="LC1805" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: delete all tv_bndr_rdrs from bndr_vars as well as body_vars.</span></span>
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1819
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1806
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<pre style="margin: 0;"> <span id="LC1806" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Kind variable scoping]</span></span>
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1820
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<pre style="margin: 0;">-<span id="LC1820" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1821
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1807
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<pre style="margin: 0;"> <span id="LC1807" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extract_hs_tv_bndrs_kvs</span> <span class="n" style="color: #333;">tv_bndrs</span></span>
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1822
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1808
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<pre style="margin: 0;"> <span id="LC1808" class="line" lang="haskell"> <span class="n" style="color: #333;">tv_bndr_rdrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">hsLTyVarLocName</span> <span class="n" style="color: #333;">tv_bndrs</span></span>
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1809
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<pre style="margin: 0;"> <span id="LC1809" 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">@@ -1848,5 +1834,16 @@ extract_tv tv acc =</td>
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1848
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1834
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<pre style="margin: 0;"> <span id="LC1834" class="line" lang="haskell"><span class="n" style="color: #333;">nubL</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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1849
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1835
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<pre style="margin: 0;"> <span id="LC1835" class="line" lang="haskell"><span class="n" style="color: #333;">nubL</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nubBy</span> <span class="n" style="color: #333;">eqLocated</span></span>
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1850
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1836
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<pre style="margin: 0;"> <span id="LC1836" class="line" lang="haskell"></span>
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1851
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<pre style="margin: 0;">-<span id="LC1851" class="line" lang="haskell"><span class="n" style="color: #333;">elemRdr</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1852
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<pre style="margin: 0;">-<span id="LC1852" class="line" lang="haskell"><span class="n" style="color: #333;">elemRdr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">eqLocated</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span></pre>
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1837
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<pre style="margin: 0;">+<span id="LC1837" class="line" lang="haskell"><span class="cd">-- | Filter out any potential implicit binders that are either</span></span>
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1838
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<pre style="margin: 0;">+<span id="LC1838" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- already in scope, or are explicitly bound in the binder.</span></span>
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1839
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<pre style="margin: 0;">+<span id="LC1839" class="line" lang="haskell"><span class="n" style="color: #333;">filterFreeVarsToBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVars</span></span>
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<pre style="margin: 0;">+<span id="LC1840" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Explicitly bound here</span></span>
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<pre style="margin: 0;">+<span id="LC1841" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;">+<span id="LC1842" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Potential implicit binders</span></span>
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<pre style="margin: 0;">+<span id="LC1843" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FreeKiTyVarsWithDups</span></span>
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<pre style="margin: 0;">+<span id="LC1844" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Final implicit binders</span></span>
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<pre style="margin: 0;">+<span id="LC1845" class="line" lang="haskell"><span class="n" style="color: #333;">filterFreeVarsToBind</span> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterOut</span> <span class="n" style="color: #333;">is_in_scope</span></span>
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<pre style="margin: 0;">+<span id="LC1846" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make sure to list the binder kvs before the body kvs, as mandated by</span></span>
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<pre style="margin: 0;">+<span id="LC1847" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Ordering of implicit variables]</span></span>
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<pre style="margin: 0;">+<span id="LC1848" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1849" class="line" lang="haskell"> <span class="n" style="color: #333;">is_in_scope</span> <span class="n" style="color: #333;">locc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">eqLocated</span> <span class="n" style="color: #333;">locc</span><span class="p">)</span> <span class="n" style="color: #333;">bndrs</span></span></pre>
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<li id="7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82cb8913b38d44ef20e928ff8b08f3f0770ebf80#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">@@ -59,7 +59,7 @@ import GHC.Types.Basic ( pprRuleName, TypeOrKind(..) )</td>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">SrcLoc</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">debugIsOn</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">filterOut</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">lengthExceeds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">partitionWith</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">debugIsOn</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lengthExceeds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">partitionWith</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HscEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsc_dflags</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.List.SetOps</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">findDupsEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">removeDups</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">equivClasses</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;">import</span> <span class="nn" style="color: #555;">GHC.Data.Graph.Directed</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">SCC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">flattenSCC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">flattenSCCs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Node</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -664,7 +664,9 @@ rnClsInstDecl (ClsInstDecl { cid_poly_ty = inst_ty, cid_binds = mbinds</td>
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC665" class="line" lang="haskell"><span class="n" style="color: #333;">rnFamInstEqn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span></span>
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<pre style="margin: 0;"> <span id="LC666" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInfo</span></span>
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<pre style="margin: 0;">-<span id="LC667" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Kind variables from the equation's RHS</span></span>
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<pre style="margin: 0;">+<span id="LC667" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">RdrName</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC668" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Kind variables from the equation's RHS to be implicitly bound</span></span>
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if no explicit forall.</span></span>
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<pre style="margin: 0;"> <span id="LC670" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEqn</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC671" 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;">HsDocContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rhs</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;">rhs'</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="LC672" 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;">FamInstEqn</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="n" style="color: #333;">rhs'</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">@@ -683,20 +685,36 @@ rnFamInstEqn doc atfi rhs_kvars</td>
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use the "...Dups" form because it's needed</span></span>
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<pre style="margin: 0;"> <span id="LC686" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- below to report unused binder on the LHS</span></span>
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<pre style="margin: 0;"> <span id="LC687" 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;">-- Implicitly bound variables, empty if we have an explicit 'forall'.</span></span>
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<pre style="margin: 0;">-<span id="LC687" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [forall-or-nothing rule] in GHC.Rename.HsType.</span></span>
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">imp_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nubL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isJust</span> <span class="n" style="color: #333;">mb_bndrs</span><span class="p">)</span> <span class="n" style="color: #333;">pat_kity_vars_with_dups</span></span>
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<pre style="margin: 0;">-<span id="LC689" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">imp_var_names</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newTyVarNameRn</span> <span class="n" style="color: #333;">mb_cls</span><span class="p">)</span> <span class="n" style="color: #333;">imp_vars</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="LC688" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">mb_bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell"> <span class="n" style="color: #333;">bnd_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">hsLTyVarLocName</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="haskell"> <span class="n" style="color: #333;">payload_kvars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterOut</span> <span class="p">(`</span><span class="n" style="color: #333;">elemRdr</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">bnd_vars</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">imp_vars</span><span class="p">))</span> <span class="n" style="color: #333;">rhs_kvars</span></span>
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<pre style="margin: 0;">-<span id="LC694" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make sure to filter out the kind variables that were explicitly</span></span>
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<pre style="margin: 0;">-<span id="LC695" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bound in the type patterns.</span></span>
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<pre style="margin: 0;">-<span id="LC696" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">payload_kvar_names</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newTyVarNameRn</span> <span class="n" style="color: #333;">mb_cls</span><span class="p">)</span> <span class="n" style="color: #333;">payload_kvars</span></span>
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- all names not bound in an explicit forall</span></span>
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<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_imp_var_names</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">imp_var_names</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">payload_kvar_names</span></span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- all_imp_vars represent the implicitly bound type variables. This is</span></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;">-- empty if we have an explicit `forall` (see</span></span>
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [forall-or-nothing rule] in GHC.Rename.HsType), which means</span></span>
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ignoring:</span></span>
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<pre style="margin: 0;">+<span id="LC694" 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="LC695" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- - pat_kity_vars_with_dups, the variables mentioned in the LHS of</span></span>
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the equation, and</span></span>
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- - rhs_kvars, the kind variables mentioned in an outermost kind</span></span>
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- signature on the RHS of the equation. (See</span></span>
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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Implicit quantification in type synonyms] in</span></span>
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Rename.HsType for why these are implicitly quantified in the</span></span>
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<pre style="margin: 0;">+<span id="LC701" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- absence of an explicit forall).</span></span>
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702
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<pre style="margin: 0;">+<span id="LC702" 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="LC703" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For example:</span></span>
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704
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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705
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<pre style="margin: 0;">+<span id="LC705" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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706
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<pre style="margin: 0;">+<span id="LC706" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type family F a b</span></span>
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707
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<pre style="margin: 0;">+<span id="LC707" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type instance forall a b c. F [(a, b)] c = a -> b -> c</span></span>
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708
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- -- all_imp_vars = []</span></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type instance F [(a, b)] c = a -> b -> c</span></span>
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<pre style="margin: 0;">+<span id="LC710" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- -- all_imp_vars = [a, b, c]</span></span>
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<pre style="margin: 0;">+<span id="LC711" 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="LC712" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">all_imp_vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isJust</span> <span class="n" style="color: #333;">mb_bndrs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No need to filter out explicit binders (the 'mb_bndrs = Just</span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- explicit_bndrs' case) because there must be none if we're going</span></span>
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to implicitly bind anything, per the previous comment.</span></span>
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"> <span class="n" style="color: #333;">nubL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">pat_kity_vars_with_dups</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">rhs_kvars</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">all_imp_var_names</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newTyVarNameRn</span> <span class="n" style="color: #333;">mb_cls</span><span class="p">)</span> <span class="n" style="color: #333;">all_imp_vars</span></span>
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<pre style="margin: 0;"> <span id="LC718" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- All the free vars of the family patterns</span></span>
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<pre style="margin: 0;"> <span id="LC720" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with a sensible binding location</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2096,14 +2114,14 @@ rnConDecl decl@(ConDeclGADT { con_names = names</td>
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<pre style="margin: 0;"> <span id="LC2114" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- That order governs the order the implicitly-quantified type</span></span>
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2115
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<pre style="margin: 0;"> <span id="LC2115" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- variable, and hence the order needed for visible type application</span></span>
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2098
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<pre style="margin: 0;"> <span id="LC2116" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #14808.</span></span>
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2099
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<pre style="margin: 0;">-<span id="LC2099" class="line" lang="haskell"> <span class="n" style="color: #333;">free_tkvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extractHsTvBndrs</span> <span class="n" style="color: #333;">explicit_tkvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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2100
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<pre style="margin: 0;">-<span id="LC2100" class="line" lang="haskell"> <span class="n" style="color: #333;">extractHsTysRdrTyVarsDups</span> <span class="p">(</span><span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">[</span><span class="n" style="color: #333;">res_ty</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC2117" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="n" style="color: #333;">explicit_forall</span></span>
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2118
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<pre style="margin: 0;">+<span id="LC2118" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTvBndrs</span> <span class="n" style="color: #333;">explicit_tkvs</span></span>
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<pre style="margin: 0;">+<span id="LC2119" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTysRdrTyVarsDups</span> <span class="p">(</span><span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">[</span><span class="n" style="color: #333;">res_ty</span><span class="p">])</span></span>
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2101
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2120
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<pre style="margin: 0;"> <span id="LC2120" class="line" lang="haskell"></span>
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2102
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<pre style="margin: 0;">-<span id="LC2102" class="line" lang="haskell"> <span class="idiff left right"> </span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ConDeclCtx</span> <span class="n" style="color: #333;">new_names</span></span>
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2121
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<pre style="margin: 0;">+<span id="LC2121" class="line" lang="haskell"> <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">let</span></span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ConDeclCtx</span> <span class="n" style="color: #333;">new_names</span></span>
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2103
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2122
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<pre style="margin: 0;"> <span id="LC2122" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">inHsDocContext</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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2104
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2123
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<pre style="margin: 0;"> <span id="LC2123" class="line" lang="haskell"></span>
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2105
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<pre style="margin: 0;">-<span id="LC2105" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"rnConDecl"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">names</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">free_tkvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">explicit_forall</span> <span class="p">)</span></span>
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2106
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<pre style="margin: 0;">-<span id="LC2106" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="p">(</span><span class="n" style="color: #333;">forAllOrNothing</span> <span class="n" style="color: #333;">explicit_forall</span> <span class="n" style="color: #333;">free_tkvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">implicit_tkvs</span> <span class="o" style="font-weight: 600;">-></span></span>
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2124
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<pre style="margin: 0;">+<span id="LC2124" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">implicit_tkvs</span> <span class="o" style="font-weight: 600;">-></span></span>
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2107
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2125
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<pre style="margin: 0;"> <span id="LC2125" class="line" lang="haskell"> <span class="n" style="color: #333;">bindLHsTyVarBndrs</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">mb_ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">explicit_tkvs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">explicit_tkvs</span> <span class="o" style="font-weight: 600;">-></span></span>
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2108
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2126
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<pre style="margin: 0;"> <span id="LC2126" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">new_cxt</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnMbContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">mcxt</span></span>
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2109
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2127
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<pre style="margin: 0;"> <span id="LC2127" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">new_args</span><span class="p">,</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnConDeclDetails</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="p">(</span><span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">new_names</span><span class="p">))</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">args</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82cb8913b38d44ef20e928ff8b08f3f0770ebf80#b360ba1f36c718ac27feddbbd33e869a1fe379dd"><strong>testsuite/tests/rename/should_fail/T18145.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ExplicitForAll #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeApplications #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18145</span> <span class="kr" style="font-weight: 600;">where</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="n" style="color: #333;">forall</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- 'a' should be out of scope</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">where</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">B</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;">Maybe</span> <span class="n" style="color: #333;">a</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">forall</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;">B</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;">Nothing</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- 'a' should be out of scope</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span> <span class="kr" style="font-weight: 600;">where</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">forall</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- 'a' should be out of scope</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82cb8913b38d44ef20e928ff8b08f3f0770ebf80#79c08f251e33b53a33c4411a94cd5679acc9406f"><strong>testsuite/tests/rename/should_fail/T18145.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18145.hs:10:44: error: Not in scope: type variable ‘a’</span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">T18145.hs:14:41: error: Not in scope: type variable ‘a’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T18145.hs:17:41: error: Not in scope: type variable ‘a’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82cb8913b38d44ef20e928ff8b08f3f0770ebf80#c2554d4efde41e6e193f728122336449d2cb5fc5"><strong>testsuite/tests/rename/should_fail/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -153,3 +153,4 @@ test('T16504', normal, compile_fail, [''])</td>
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153
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14548</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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154
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154
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16610</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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155
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155
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17593</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18145</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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