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<h3>
Simon Peyton Jones pushed to branch wip/T16728
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/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7">bb5f015c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-06-07T10:14:25Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typechecking of partial type signatures

Partial type sigs had grown hair.  tcHsParialSigType was
doing lots of unnecessary work, and tcInstSig was cloning it
unnecessarily -- and the result didn't even work: #16728.

This patch cleans it all up, described by TcHsType
  Note [Checking parital type signatures]

I basically just deleted code... but very carefully!

Some refactoring along the way

* Distinguish more explicintly between "anonymous" wildcards "_"
  and "named" wildcards "_a".  I changed the names of a number
  of functions to make this distinction much more apparent.

The patch also revealed that the code in `TcExpr`
that implements the special typing rule for `($)` was wrong.
It called `getRuntimeRep` in a situation where where was no
particular reason to suppose that the thing had kind `TYPE r`.

This caused a crash in typecheck/should_run/T10846.

The fix was easy, and actually simplifies the code in `TcExpr`
quite a bit.  Hooray.
</pre>
</li>
</ul>
<h4>18 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#80d26d5d3ff0c380bfa505239d3192d66657fe32">
compiler/rename/RnTypes.hs
</a>
</li>
<li class="file-stats">
<a href="#a83766f600de0ac03e19fb4b379bc90111dc73a5">
compiler/typecheck/TcBinds.hs
</a>
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<li class="file-stats">
<a href="#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
compiler/typecheck/TcCanonical.hs
</a>
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<li class="file-stats">
<a href="#3668e5951898e1cee434d7e6fb5a139287ebe70d">
compiler/typecheck/TcExpr.hs
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<li class="file-stats">
<a href="#350c4076427c611b8f14e875a4ca553041c2b847">
compiler/typecheck/TcHsType.hs
</a>
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<li class="file-stats">
<a href="#2799ba786adc98d485fad6003334b913a0069bdc">
compiler/typecheck/TcRnDriver.hs
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<li class="file-stats">
<a href="#fa5bd207fd28db668d069147fd989ad2ac810fd7">
compiler/typecheck/TcRnMonad.hs
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<li class="file-stats">
<a href="#d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813">
compiler/typecheck/TcRnTypes.hs
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<li class="file-stats">
<a href="#341aef35ac370771edf59ec6b9fbb31507fa6f18">
compiler/typecheck/TcSigs.hs
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<li class="file-stats">
<a href="#341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07">
compiler/typecheck/TcType.hs
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<li class="file-stats">
<a href="#fc93b26a3154f102f2bf16cf72ae4576f234d0f4">
<span class="new-file">
+
testsuite/tests/partial-sigs/should_compile/T16728.hs
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<li class="file-stats">
<a href="#b16a1ffd67ffd8fd4e68341503bf44c581910108">
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testsuite/tests/partial-sigs/should_compile/T16728.stderr
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<li class="file-stats">
<a href="#65238b2bc6d63b92c18503e1d45d68c4641cda65">
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testsuite/tests/partial-sigs/should_compile/T16728a.hs
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<li class="file-stats">
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testsuite/tests/partial-sigs/should_compile/T16728a.stderr
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<a href="#d6d32f1b07f8052f82e7678e4a15e0cf57b827c1">
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testsuite/tests/partial-sigs/should_compile/T16728b.hs
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testsuite/tests/partial-sigs/should_compile/T16728b.stderr
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<a href="#638bf502d5c9ded68b185325d908464f7da3dcac">
testsuite/tests/partial-sigs/should_compile/all.T
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<a href="#f745b3f653a464a3341ae5abc26753bc68ee88cd">
testsuite/tests/partial-sigs/should_fail/T14040a.stderr
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</ul>
<h4>Changes:</h4>
<li id="80d26d5d3ff0c380bfa505239d3192d66657fe32">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#80d26d5d3ff0c380bfa505239d3192d66657fe32"><strong>compiler/rename/RnTypes.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="693" 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="693" 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">@@ -693,8 +693,8 @@ checkAnonWildCard env</td>
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<td class="diff-line-num old_line" data-linenumber="693" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="haskell">           <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell">           <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">rtke_what</span> <span class="n" style="color: #333;">env</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC695" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">RnTypeBody</span>      <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="696" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<td class="diff-line-num new_line old" data-linenumber="696" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC696" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">RnConstraint</span>    <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">constraint_msg</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="697" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="696" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC696" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">RnTopConstraint</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">constraint_msg</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="698" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="697" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">RnConstraint</span>    <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">constraint_msg</span></span>
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="699" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell">    <span class="n" style="color: #333;">constraint_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span></span>
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell">                         <span class="p">(</span><span class="n" style="color: #333;">notAllowed</span> <span class="n" style="color: #333;">pprAnonWildCard</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"in a constraint"</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="714" 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="714" 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">@@ -714,7 +714,10 @@ checkNamedWildCard env name</td>
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell">           <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell">           <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">rtke_what</span> <span class="n" style="color: #333;">env</span> <span class="kr" style="font-weight: 600;">of</span></span>
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716
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<pre style="margin: 0;"> <span id="LC716" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">RnTypeBody</span>      <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span>   <span class="c1" style="color: #998; font-style: italic;">-- Allowed</span></span>
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717
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<td class="diff-line-num new_line old" data-linenumber="717" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC717" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">RnTopConstraint</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span>   <span class="c1" style="color: #998; font-style: italic;">-- Allowed</span></span>
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717
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">RnTopConstraint</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span>   <span class="c1" style="color: #998; font-style: italic;">-- Allowed; e.g.</span></span>
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<td class="diff-line-num new old_line" data-linenumber="718" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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718
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell">                  <span class="c1" style="color: #998; font-style: italic;">-- f :: (Eq _a) => _a -> Int</span></span>
</pre>
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719
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell">                  <span class="c1" style="color: #998; font-style: italic;">-- g :: (_a, _b) => T _a _b -> Int</span></span>
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720
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell">                  <span class="c1" style="color: #998; font-style: italic;">-- The named tyvars get filled in from elsewhere</span></span>
</pre>
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718
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721
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">RnConstraint</span>    <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">constraint_msg</span></span>
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719
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722
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="haskell">    <span class="n" style="color: #333;">constraint_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">notAllowed</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"in a constraint"</span></span>
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720
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723
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="haskell"></span>
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<li id="a83766f600de0ac03e19fb4b379bc90111dc73a5">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#a83766f600de0ac03e19fb4b379bc90111dc73a5"><strong>compiler/typecheck/TcBinds.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1020" 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">@@ -1020,7 +1020,7 @@ chooseInferredQuantifiers inferred_theta tau_tvs qtvs</td>
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"></span>
</pre>
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell">           <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcGetCastedTyVar_maybe</span> <span class="n" style="color: #333;">wc_var_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1022
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1022
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- We know that wc_co must have type kind(wc_var) ~ Constraint, as it</span></span>
</pre>
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1023
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<pre style="margin: 0;">-<span id="LC1023" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- comes from the checkExpectedKind in TcHsType.tcWildCardOcc. So, to</span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- comes from the checkExpectedKind in TcHsType.tc<span class="idiff left right">Anon</span>WildCardOcc. So, to</span></span>
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1024
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- make the kinds work out, we reverse the cast here.</span></span>
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1025
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">wc_var</span><span class="p">,</span> <span class="n" style="color: #333;">wc_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">writeMetaTyVar</span> <span class="n" style="color: #333;">wc_var</span> <span class="p">(</span><span class="n" style="color: #333;">ctuple</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">mkTcSymCo</span> <span class="n" style="color: #333;">wc_co</span><span class="p">)</span></span>
</pre>
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1026
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">Nothing</span>              <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"chooseInferredQuantifiers 1"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wc_var_ty</span><span class="p">)</span></span>
</pre>
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<li id="9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a"><strong>compiler/typecheck/TcCanonical.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1008" 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="1008" 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">@@ -1008,6 +1008,8 @@ can_eq_nc_forall ev eq_rel s1 s2</td>
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1008
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1008
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<pre style="margin: 0;"> <span id="LC1008" class="line" lang="haskell">                                                  <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv2</span><span class="p">))</span></span>
</pre>
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1009
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1009
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<pre style="margin: 0;"> <span id="LC1009" class="line" lang="haskell">                   <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">subst'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTvSubstAndInScope</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv2</span></span>
</pre>
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1010
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1010
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<pre style="margin: 0;"> <span id="LC1010" class="line" lang="haskell">                                       <span class="p">(</span><span class="n" style="color: #333;">mkCastTy</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">skol_tv</span><span class="p">)</span> <span class="n" style="color: #333;">kind_co</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1011" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell">                         <span class="c1" style="color: #998; font-style: italic;">-- skol_tv is already in the in-scope set, but the</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1011" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell">                         <span class="c1" style="color: #998; font-style: italic;">-- free vars of kind_co are not; hence "...AndInScope"</span></span>
</pre>
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1011
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<td class="diff-line-num new_line" data-linenumber="1013" 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">
1013
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell">                   <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">bndrs2</span></span>
</pre>
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1012
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<td class="diff-line-num new_line" data-linenumber="1014" 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">
1014
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<pre style="margin: 0;"> <span id="LC1014" class="line" lang="haskell">                   <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">mkTcForAllCo</span> <span class="n" style="color: #333;">skol_tv</span> <span class="n" style="color: #333;">kind_co</span> <span class="n" style="color: #333;">co</span></span>
</pre>
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1013
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<td class="diff-line-num new_line" data-linenumber="1015" 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">
1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell">                            <span class="p">,</span> <span class="n" style="color: #333;">wanteds1</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">wanteds2</span> <span class="p">)</span> <span class="p">}</span></span>
</pre>
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<li id="3668e5951898e1cee434d7e6fb5a139287ebe70d">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#3668e5951898e1cee434d7e6fb5a139287ebe70d"><strong>compiler/typecheck/TcExpr.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="378" 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="378" 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">@@ -378,42 +378,35 @@ tcExpr expr@(OpApp fix arg1 op arg2) res_ty</td>
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378
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- So: arg1_ty = arg2_ty -> op_res_ty</span></span>
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<td class="diff-line-num new_line" data-linenumber="379" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- where arg2_sigma maybe polymorphic; that's the point</span></span>
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380
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="381" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
381
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<td class="diff-line-num new_line old" data-linenumber="381" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">arg2'</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcArg</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">arg2</span> <span class="n" style="color: #333;">arg2_sigma</span> <span class="mi" style="color: #099;">2</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="382" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">arg2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcArg</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">arg2</span> <span class="n" style="color: #333;">arg2_sigma</span> <span class="mi" style="color: #099;">2</span></span>
</pre>
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382
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382
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"></span>
</pre>
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383
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383
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Make sure that the argument type has kind '*'</span></span>
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384
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">--   ($) :: forall (r:RuntimeRep) (a:*) (b:TYPE r). (a->b) -> a -> b</span></span>
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385
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385
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Eg we do not want to allow  (D#  $  4.0#)   #5570</span></span>
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386
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386
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">--    (which gives a seg fault)</span></span>
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387
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<pre style="margin: 0;">-<span id="LC387" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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388
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- The *result* type can have any kind (#8739),</span></span>
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389
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<pre style="margin: 0;">-<span id="LC389" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- so we don't need to check anything for that</span></span>
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390
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyKind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">NHsCoreTy</span> <span class="n" style="color: #333;">arg2_sigma</span><span class="p">))</span></span>
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391
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell">                        <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">arg2_sigma</span><span class="p">)</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
</pre>
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392
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell">           <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">i</span>gnore the evidence. arg2_sigma must have type * or #,</span></span>
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393
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell">           <span class="c1" style="color: #998; font-style: italic;">-- because we know <span class="idiff left right">arg2_sigma -> or_res_ty</span> is well-kinded</span></span>
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell">           <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">I</span>gnore the evidence. arg2_sigma must have type * or #,</span></span>
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell">           <span class="c1" style="color: #998; font-style: italic;">-- because we know <span class="idiff left right">(arg2_sigma -> op_res_ty)</span> is well-kinded</span></span>
</pre>
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394
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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell">           <span class="c1" style="color: #998; font-style: italic;">-- (because otherwise matchActualFunTys would fail)</span></span>
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395
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<td class="diff-line-num new_line old" data-linenumber="392" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell">           <span class="c1" style="color: #998; font-style: italic;">-- There's no possibility here of, say, a kind family reducing to *.</span></span>
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392
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell">           <span class="c1" style="color: #998; font-style: italic;">-- So this 'unifyKind' will either succeed with Refl, or will</span></span>
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393
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell">           <span class="c1" style="color: #998; font-style: italic;">-- produce an insoluble constraint * ~ #, which we'll report later.</span></span>
</pre>
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396
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394
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"></span>
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397
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<pre style="margin: 0;">-<span id="LC397" 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">wrap_res</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">tcSubTypeHR</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">orig1</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">expr</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">op_res_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">res_ty</span></span></span>
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<pre style="margin: 0;">-<span id="LC398" class="line" lang="haskell">       <span class="idiff left">                </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- op_res -> res</span></span></span>
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- NB: unlike the argument type, the *result* type, op_res_ty can</span></span></span>
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- have any kind (#8739), so we don't need to check anything for that</span></span></span>
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<pre style="margin: 0;"> <span id="LC397" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">op_id</span>  <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLookupId</span> <span class="n" style="color: #333;">op_name</span></span>
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<pre style="margin: 0;">-<span id="LC401" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">op'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsWrap</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpTyApps</span> <span class="p">[</span> <span class="n" style="color: #333;">getRuntimeRep</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">op'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsWrap</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpTyApps</span> <span class="p">[</span> <span class="n" style="color: #333;">getRuntimeRep</span> <span class="n" style="color: #333;">op_res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC400" class="line" lang="haskell">                                               <span class="p">,</span> <span class="n" style="color: #333;">arg2_sigma</span></span>
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell">                                               <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="LC401" class="line" lang="haskell">                                               <span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">op_</span>res_ty</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell">                                   <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="n" style="color: #333;">noExt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">lv</span> <span class="n" style="color: #333;">op_id</span><span class="p">)))</span></span>
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<pre style="margin: 0;"> <span id="LC403" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- arg1' :: arg1_ty</span></span>
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- wrap_arg1 :: arg1_ty "->" (arg2_sigma -> op_res_ty)</span></span>
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- wrap_res :: op_res_ty "->" res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- op' :: (a2_ty -> res_ty) -> a2_ty -> res_ty</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- op' :: (a2_ty -> op_res_ty) -> a2_ty -> op_res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">-<span id="LC411" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- wrap1 :: arg1_ty "->" (arg2_sigma -> res_ty)</span></span>
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<pre style="margin: 0;">-<span id="LC412" class="line" lang="haskell">             <span class="n" style="color: #333;">wrap1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWpFun</span> <span class="n" style="color: #333;">idHsWrapper</span> <span class="n" style="color: #333;">wrap_res</span> <span class="n" style="color: #333;">arg2_sigma</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">doc</span></span>
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<pre style="margin: 0;">-<span id="LC413" class="line" lang="haskell">                     <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">wrap_arg1</span></span>
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<pre style="margin: 0;">-<span id="LC414" class="line" lang="haskell">             <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"When looking at the argument to ($)"</span></span>
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell">             <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OpApp</span> <span class="n" style="color: #333;">fix</span> <span class="p">(</span><span class="n" style="color: #333;">mkLHsWrap</span> <span class="n" style="color: #333;">wrap_arg1</span> <span class="n" style="color: #333;">arg1'</span><span class="p">)</span> <span class="n" style="color: #333;">op'</span> <span class="n" style="color: #333;">arg2'</span></span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC416" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">return</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">OpApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fix</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkLHsWrap</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wrap1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg1'</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">op'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg2'</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">tcWrapResult</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">expr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">expr'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">op_res_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">res_ty</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC411" 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;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ambiguous</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">lbl</span><span class="p">)))</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell">  <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">obviousSig</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">arg1</span><span class="p">)</span></span>
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</li>
<li id="350c4076427c611b8f14e875a4ca553041c2b847">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#350c4076427c611b8f14e875a4ca553041c2b847"><strong>compiler/typecheck/TcHsType.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="36" 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">@@ -36,7 +36,7 @@ module TcHsType (</td>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- Kind-checking types</span></span>
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<td class="diff-line-num old_line" data-linenumber="37" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- No kind generalisation, no checkValidType</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">kcLHsQTyVars</span><span class="p">,</span></span>
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<td class="diff-line-num new_line old" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">tcWildCardBinders</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">tc<span class="idiff left right">Named</span>WildCardBinders</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">tcHsLiftedType</span><span class="p">,</span>   <span class="nf" style="color: #900; font-weight: 600;">tcHsOpenType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">tcHsLiftedTypeNC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcHsOpenTypeNC</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">tcLHsType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcLHsTypeUnsaturated</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcCheckLHsType</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">@@ -370,7 +370,7 @@ tcHsTypeApp wc_ty kind</td>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell">               <span class="n" style="color: #333;">unsetWOptM</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnPartialTypeSignatures</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC371" class="line" lang="haskell">               <span class="n" style="color: #333;">setXOptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">PartialTypeSignatures</span> <span class="o" style="font-weight: 600;">$</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;">-- See Note [Wildcards in visible type application]</span></span>
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell">               <span class="n" style="color: #333;">tcWildCardBinders</span> <span class="n" style="color: #333;">sig_wcs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell">               <span class="n" style="color: #333;">tc<span class="idiff left right">Named</span>WildCardBinders</span> <span class="n" style="color: #333;">sig_wcs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell">               <span class="n" style="color: #333;">tcCheckLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">kind</span></span>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- We must promote here. Ex:</span></span>
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">--   f :: forall a. a</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="385" 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="385" 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">@@ -385,18 +385,19 @@ tcHsTypeApp (XHsWildCardBndrs _) _ = panic "tcHsTypeApp"</td>
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Wildcards in visible type application]</span></span>
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A HsWildCardBndrs's hswc_ext now only includes named wildcards, so any unnamed</span></span>
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<pre style="margin: 0;">-<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">wildcards stay unchanged in hswc_body and when called in tcHsTypeApp, tcCheckLHsType</span></span>
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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will call emitWildCardHoleConstraints on them. However, this would trigger</span></span>
</pre>
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392
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">error/warning when an unnamed wildcard is passed in as a visible type argument,</span></span>
</pre>
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which we do not want because users should be able to write @_ to skip a instantiating</span></span>
</pre>
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<pre style="margin: 0;">-<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a type variable variable without fuss. The solution is to switch the</span></span>
</pre>
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395
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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">PartialTypeSignatures flags here to let the typechecker know that it's checking</span></span>
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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a '@_' and do not emit hole constraints on it.</span></span>
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397
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<pre style="margin: 0;">-<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See related Note [Wildcards in visible kind application]</span></span>
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<pre style="margin: 0;">-<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and Note [The wildcard story for types] in HsTypes.hs</span></span>
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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A HsWildCardBndrs's hswc_ext now only includes /named/ wildcards, so</span></span>
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">any unnamed wildcards stay unchanged in hswc_body.  When called in</span></span>
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tcHsTypeApp, tcCheckLHsType will call emitAnonWildCardHoleConstraint</span></span>
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on these anonymous wildcards. However, this would trigger</span></span>
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">error/warning when an anonymous wildcard is passed in as a visible type</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">argument, which we do not want because users should be able to write</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@_ to skip a instantiating a type variable variable without fuss. The</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">solution is to switch the PartialTypeSignatures flags here to let the</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">typechecker know that it's checking a '@_' and do not emit hole</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraints on it.  See related Note [Wildcards in visible kind</span></span>
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">application] and Note [The wildcard story for types] in HsTypes.hs</span></span>
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<td class="diff-line-num new new_line" data-linenumber="399" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
399
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="400" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="400" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
400
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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ugh!</span></span>
</pre>
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400
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<td class="diff-line-num new_line" data-linenumber="401" 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">
401
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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="401" 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">
401
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<td class="diff-line-num new_line" data-linenumber="402" 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">
402
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"></span>
</pre>
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402
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<td class="diff-line-num new_line" data-linenumber="403" 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">
403
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<pre style="margin: 0;"> <span id="LC403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="812" 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="813" 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">@@ -812,7 +813,7 @@ tc_hs_type mode ty@(HsAppKindTy{})         ek = tc_infer_hs_type_ek mode ty ek</td>
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812
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<td class="diff-line-num new_line" data-linenumber="813" 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">
813
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<pre style="margin: 0;"> <span id="LC813" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsOpTy</span> <span class="p">{})</span>             <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_hs_type_ek</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
</pre>
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813
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<td class="diff-line-num new_line" data-linenumber="814" 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">
814
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsKindSig</span> <span class="p">{})</span>          <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_hs_type_ek</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="814" 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">
814
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<td class="diff-line-num new_line" data-linenumber="815" 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">
815
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<pre style="margin: 0;"> <span id="LC815" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NHsCoreTy</span><span class="p">{}))</span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_hs_type_ek</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="815" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
815
</td>
<td class="diff-line-num new_line old" data-linenumber="816" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC815" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="kr" style="font-weight: 600;">_</span>    <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWildCardTy</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span>        <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcWildCardOcc</span> <span class="n" style="color: #333;">wc</span> <span class="n" style="color: #333;">ek</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="816" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="816" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
816
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<pre style="margin: 0;">+<span id="LC816" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="kr" style="font-weight: 600;">_</span>    <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWildCardTy</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span>        <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc<span class="idiff left right">Anon</span>WildCardOcc</span> <span class="n" style="color: #333;">wc</span> <span class="n" style="color: #333;">ek</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="816" 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">
816
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<td class="diff-line-num new_line" data-linenumber="817" 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">
817
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<pre style="margin: 0;"> <span id="LC817" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="817" 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">
817
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<td class="diff-line-num new_line" data-linenumber="818" 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">
818
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="818" 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">
818
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<td class="diff-line-num new_line" data-linenumber="819" 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">
819
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<pre style="margin: 0;"> <span id="LC819" class="line" lang="haskell"><span class="n" style="color: #333;">tc_fun_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="832" 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="833" 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">@@ -832,18 +833,18 @@ tc_fun_type mode ty1 ty2 exp_kind = case mode_level mode of</td>
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832
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<td class="diff-line-num new_line" data-linenumber="833" 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">
833
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell">                           <span class="n" style="color: #333;">liftedTypeKind</span> <span class="n" style="color: #333;">exp_kind</span> <span class="p">}</span></span>
</pre>
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833
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<td class="diff-line-num new_line" data-linenumber="834" 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">
834
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"></span>
</pre>
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834
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<td class="diff-line-num new_line" data-linenumber="835" 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">
835
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="835" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
835
</td>
<td class="diff-line-num new_line old" data-linenumber="836" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC835" class="line" lang="haskell"><span class="n" style="color: #333;">tcWildCardOcc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="836" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
836
</td>
<td class="diff-line-num new_line old" data-linenumber="836" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC836" class="line" lang="haskell"><span class="n" style="color: #333;">tcWildCardOcc</span> <span class="n" style="color: #333;">wc</span> <span class="n" style="color: #333;">exp_kind</span></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="837" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
837
</td>
<td class="diff-line-num new_line old" data-linenumber="836" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC837" 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;">wc_tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWildTyVar</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="838" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
838
</td>
<td class="diff-line-num new_line old" data-linenumber="836" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC838" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- The wildcard's kind should be an un-filled-in meta tyvar</span></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="839" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
839
</td>
<td class="diff-line-num new_line old" data-linenumber="836" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC839" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getSrcSpanM</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="840" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
840
</td>
<td class="diff-line-num new_line old" data-linenumber="836" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC840" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newUnique</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="841" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
841
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<td class="diff-line-num new_line old" data-linenumber="836" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC841" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInternalName</span> <span class="n" style="color: #333;">uniq</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarOcc</span> <span class="s" style="color: #d14;">"_"</span><span class="p">)</span> <span class="n" style="color: #333;">loc</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="842" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="836" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
836
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"><span class="n" style="color: #333;">tcAnonWildCardOcc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="842" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="837" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
837
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"><span class="n" style="color: #333;">tcAnonWildCardOcc</span> <span class="n" style="color: #333;">wc</span> <span class="n" style="color: #333;">exp_kind</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="842" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="838" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
838
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWildTyVar</span>  <span class="c1" style="color: #998; font-style: italic;">-- The wildcard's kind will be an un-filled-in meta tyvar</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="842" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="839" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
839
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="842" 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">
842
</td>
<td class="diff-line-num new_line" data-linenumber="840" 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">
840
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">part_tysig</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">PartialTypeSignatures</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="843" 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">
843
</td>
<td class="diff-line-num new_line" data-linenumber="841" 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">
841
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">warning</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">woptM</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnPartialTypeSignatures</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="844" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
844
</td>
<td class="diff-line-num new_line old" data-linenumber="842" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC844" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wildcards in visible kind application]</span></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="845" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
845
</td>
<td class="diff-line-num new_line old" data-linenumber="842" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC845" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">part_tysig</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">warning</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="846" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
846
</td>
<td class="diff-line-num new_line old" data-linenumber="842" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC846" class="line" lang="haskell">             <span class="p">(</span><span class="n" style="color: #333;">emitWildCardHoleConstraints</span> <span class="p">[(</span><span class="n" style="color: #333;">name</span><span class="p">,</span><span class="n" style="color: #333;">wc_tv</span><span class="p">)])</span></span>
</pre>
</td>
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">part_tysig</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">warning</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell">         <span class="n" style="color: #333;">emitAnonWildCardHoleConstraint</span> <span class="n" style="color: #333;">wc_tv</span></span>
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845
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<pre style="margin: 0;">+<span id="LC845" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- Why the 'unless' guard?</span></span>
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wildcards in visible kind application]</span></span>
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847
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"></span>
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847
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848
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">checkExpectedKind</span> <span class="n" style="color: #333;">wc</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">wc_tv</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell">                           <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">wc_tv</span><span class="p">)</span> <span class="n" style="color: #333;">exp_kind</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC850" 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">@@ -860,11 +861,11 @@ x = MkT</td>
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we should allow '@_' without emitting any hole constraints, and</span></span>
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">regardless of whether PartialTypeSignatures is enabled or not. But how would</span></span>
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the typechecker know which '_' is being used in VKA and which is not when it</span></span>
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">calls emitWildCardHoleConstraints in tcHsPartialSigType on all HsWildCardBndrs?</span></span>
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">calls emit<span class="idiff left right">Named</span>WildCardHoleConstraints in tcHsPartialSigType on all HsWildCardBndrs?</span></span>
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The solution then is to neither rename nor include unnamed wildcards in HsWildCardBndrs,</span></span>
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865
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<td class="diff-line-num new_line old" data-linenumber="866" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but instead give every <span class="idiff left right">unnamed wildcard a fresh wild tyvar in tc</span>WildCardOcc.</span></span>
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<td class="diff-line-num new old_line" data-linenumber="866" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="866" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
866
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but instead give every <span class="idiff left right">anonymous wildcard a fresh wild tyvar in tcAnon</span>WildCardOcc.</span></span>
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<td class="diff-line-num new_line" data-linenumber="867" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And whenever we see a '@', we automatically turn on PartialTypeSignatures and</span></span>
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<pre style="margin: 0;">-<span id="LC867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">turn off hole constraint warnings, and <span class="idiff left right">never call emitWildCardHoleConstraints</span></span></span>
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<pre style="margin: 0;">+<span id="LC868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">turn off hole constraint warnings, and <span class="idiff left right">do not call emitAnonWildCardHoleConstraint</span></span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">under these conditions.</span></span>
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869
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See related Note [Wildcards in visible type application] here and</span></span>
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [The wildcard story for types] in HsTypes.hs</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">@@ -1705,23 +1706,26 @@ To avoid the double-zonk, we do two things:</td>
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<pre style="margin: 0;"> <span id="LC1706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    gathers free variables. So this way effectively sidesteps step 3.</span></span>
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<pre style="margin: 0;"> <span id="LC1707" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC1708" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1708" class="line" lang="haskell"><span class="n" style="color: #333;">tcWildCardBinders</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC1709" class="line" lang="haskell">                  <span class="o" style="font-weight: 600;">-></span> <span class="p">([(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1710" class="line" lang="haskell">                  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC1711" class="line" lang="haskell"><span class="n" style="color: #333;">tcWildCardBinders</span> <span class="n" style="color: #333;">wc_names</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC1709" class="line" lang="haskell"><span class="n" style="color: #333;">tcNamedWildCardBinders</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC1710" class="line" lang="haskell">                       <span class="o" style="font-weight: 600;">-></span> <span class="p">([(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1711" class="line" lang="haskell">                       <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC1712" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Bring into scope the /named/ wildcard binders.  Remember that</span></span>
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<pre style="margin: 0;">+<span id="LC1713" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- plain wildcards _ are anonymous and dealt with by HsWildCardTy</span></span>
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<pre style="margin: 0;">+<span id="LC1714" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Soe Note [The wildcard story for types] in HsTypes</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1712" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1715" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1715
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC1715" class="line" lang="haskell"><span class="n" style="color: #333;">tcNamedWildCardBinders</span> <span class="n" style="color: #333;">wc_names</span> <span class="n" style="color: #333;">thing_inside</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1712" 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">
1712
</td>
<td class="diff-line-num new_line" data-linenumber="1716" 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">
1716
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1716" 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;">wcs</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;">const</span> <span class="n" style="color: #333;">newWildTyVar</span><span class="p">)</span> <span class="n" style="color: #333;">wc_names</span></span>
</pre>
</td>
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<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="1713" 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">
1713
</td>
<td class="diff-line-num new_line" data-linenumber="1717" 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">
1717
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1717" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">wc_prs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc_names</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">wcs</span></span>
</pre>
</td>
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<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="1714" 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">
1714
</td>
<td class="diff-line-num new_line" data-linenumber="1718" 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">
1718
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1718" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">tcExtendNameTyVarEnv</span> <span class="n" style="color: #333;">wc_prs</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1715" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1715
</td>
<td class="diff-line-num new_line" data-linenumber="1719" 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">
1719
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<pre style="margin: 0;"> <span id="LC1719" class="line" lang="haskell">         <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">wc_prs</span> <span class="p">}</span></span>
</pre>
</td>
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<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="1716" 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">
1716
</td>
<td class="diff-line-num new_line" data-linenumber="1720" 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">
1720
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1720" class="line" lang="haskell"></span>
</pre>
</td>
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<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="1717" 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">
1717
</td>
<td class="diff-line-num new_line" data-linenumber="1721" 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">
1721
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1721" class="line" lang="haskell"><span class="n" style="color: #333;">newWildTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span></span>
</pre>
</td>
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<tr class="line_holder old" id="" style="line-height: 1.6;">
<td class="diff-line-num old old_line" data-linenumber="1718" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1718
</td>
<td class="diff-line-num new_line old" data-linenumber="1722" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">
<pre style="margin: 0;">-<span id="LC1718" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ New unification variable for a wildcard</span></span>
</pre>
</td>
</tr>
<tr class="line_holder new" id="" style="line-height: 1.6;">
<td class="diff-line-num new old_line" data-linenumber="1719" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1722" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1722
</td>
<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC1722" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ New unification variable <span class="idiff left right">'_' </span>for a wildcard</span></span>
</pre>
</td>
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<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="1719" 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">
1719
</td>
<td class="diff-line-num new_line" data-linenumber="1723" 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">
1723
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1723" class="line" lang="haskell"><span class="n" style="color: #333;">newWildTyVar</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1720" 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">
1720
</td>
<td class="diff-line-num new_line" data-linenumber="1724" 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">
1724
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1724" 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;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaKindVar</span></span>
</pre>
</td>
</tr>
<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="1721" 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">
1721
</td>
<td class="diff-line-num new_line" data-linenumber="1725" 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">
1725
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1725" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newUnique</span></span>
</pre>
</td>
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<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="1722" 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">
1722
</td>
<td class="diff-line-num new_line" data-linenumber="1726" 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">
1726
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1726" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaDetails</span> <span class="kt" style="color: #458; font-weight: 600;">TauTv</span></span>
</pre>
</td>
</tr>
<tr class="line_holder old" id="" style="line-height: 1.6;">
<td class="diff-line-num old old_line" data-linenumber="1723" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1723
</td>
<td class="diff-line-num new_line old" data-linenumber="1727" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">
<pre style="margin: 0;">-<span id="LC1723" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSysTvName</span> <span class="n" style="color: #333;">uniq</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"_"</span><span class="p">)</span></span>
</pre>
</td>
</tr>
<tr class="line_holder old" id="" style="line-height: 1.6;">
<td class="diff-line-num old old_line" data-linenumber="1724" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1724
</td>
<td class="diff-line-num new_line old" data-linenumber="1727" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
</td>
<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">
<pre style="margin: 0;">-<span id="LC1724" class="line" lang="haskell">             <span class="n" style="color: #333;">tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkTcTyVar</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">name</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">kind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">details</span></span><span class="p"><span class="idiff right">)</span></span></span>
</pre>
</td>
</tr>
<tr class="line_holder new" id="" style="line-height: 1.6;">
<td class="diff-line-num new old_line" data-linenumber="1725" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1727" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1727
</td>
<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC1727" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">name</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSysTvName</span> <span class="n" style="color: #333;">uniq</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"_"</span><span class="p">)</span></span>
</pre>
</td>
</tr>
<tr class="line_holder new" id="" style="line-height: 1.6;">
<td class="diff-line-num new old_line" data-linenumber="1725" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1728" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1728
</td>
<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC1728" class="line" lang="haskell">             <span class="n" style="color: #333;">tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">mkTcTyVar</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">name</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">kind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">details</span></span></span>
</pre>
</td>
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<pre style="margin: 0;"> <span id="LC1729" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"newWildTyVar"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvar</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1730" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">tyvar</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1731" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2477" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span>       <span class="c1" style="color: #998; font-style: italic;">-- The type signature</span></span>
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<pre style="margin: 0;"> <span id="LC2478" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</span>  <span class="c1" style="color: #998; font-style: italic;">-- Wildcards</span></span>
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<pre style="margin: 0;"> <span id="LC2479" class="line" lang="haskell">         <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span>       <span class="c1" style="color: #998; font-style: italic;">-- Extra-constraints wildcard</span></span>
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<td class="diff-line-num new_line old" data-linenumber="2480" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2476" class="line" lang="haskell">         <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Name</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff">             </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Original tyvar names, in correspondence with ...</span></span></span>
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<pre style="margin: 0;">-<span id="LC2477" class="line" lang="haskell">         <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcTyVar</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff">          </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- ... I</span>mplicitly and explicitly bound type variables</span></span>
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<pre style="margin: 0;">+<span id="LC2480" class="line" lang="haskell">         <span class="p">,</span> <span class="p">[<span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Name</span></span><span class="p"><span class="idiff">,</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcTyVar</span></span><span class="p"><span class="idiff">)]</span></span><span class="idiff">   </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Original tyvar names, in correspondence with</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="2481" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2481" class="line" lang="haskell">         <span class="idiff left">                     </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">--   the i</span>mplicitly and explicitly bound type variables</span></span>
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<pre style="margin: 0;"> <span id="LC2482" class="line" lang="haskell">         <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span>        <span class="c1" style="color: #998; font-style: italic;">-- Theta part</span></span>
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<pre style="margin: 0;"> <span id="LC2483" class="line" lang="haskell">         <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="p">)</span>           <span class="c1" style="color: #998; font-style: italic;">-- Tau part</span></span>
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<pre style="margin: 0;">-<span id="LC2480" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Recipe for checking a signature</span>]</span></span>
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<pre style="margin: 0;">+<span id="LC2484" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Checking partial type signatures</span>]</span></span>
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<pre style="margin: 0;"> <span id="LC2485" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsPartialSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;"> <span id="LC2486" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="p">{</span> <span class="n" style="color: #333;">hswc_ext</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hswc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ib_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;"> <span id="LC2487" class="line" lang="haskell">  <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_hs_tvs</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2485" 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="2489" 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">@@ -2485,8 +2489,11 @@ tcHsPartialSigType ctxt sig_ty</td>
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<pre style="margin: 0;"> <span id="LC2489" class="line" lang="haskell">  <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">explicit_hs_tvs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">hs_ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">hs_tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsSigmaTy</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC2490" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addSigCtxt</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2491" 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;">implicit_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">explicit_tvs</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;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)))</span></span>
</pre>
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<td class="diff-line-num new_line old" data-linenumber="2492" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2488" class="line" lang="haskell">            <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveLocalEqualities</span> <span class="s" style="color: #d14;">"tcHsPatSigTypes"</span>      <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC2489" class="line" lang="haskell">               <span class="n" style="color: #333;">tcWildCardBinders</span> <span class="n" style="color: #333;">sig_wcs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">wcs</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC2492" class="line" lang="haskell">            <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveLocalEqualities</span> <span class="s" style="color: #d14;">"tcHsPartialSigType"</span>    <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2493" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2493" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- This solveLocalEqualiltes fails fast if there are</span></span>
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<pre style="margin: 0;">+<span id="LC2494" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- insoluble equalities. See TcSimplify</span></span>
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<pre style="margin: 0;">+<span id="LC2495" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- Note [Fail fast if there are insoluble kind equalities]</span></span>
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<pre style="margin: 0;">+<span id="LC2496" class="line" lang="haskell">               <span class="n" style="color: #333;">tcNamedWildCardBinders</span> <span class="n" style="color: #333;">sig_wcs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">wcs</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC2497" class="line" lang="haskell">               <span class="n" style="color: #333;">bindImplicitTKBndrs_Tv</span> <span class="n" style="color: #333;">implicit_hs_tvs</span>       <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2498" class="line" lang="haskell">               <span class="n" style="color: #333;">bindExplicitTKBndrs_Tv</span> <span class="n" style="color: #333;">explicit_hs_tvs</span>       <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2499" class="line" lang="haskell">               <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span>   <span class="c1" style="color: #998; font-style: italic;">-- Instantiate the type-class context; but if there</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">@@ -2497,38 +2504,23 @@ tcHsPartialSigType ctxt sig_ty</td>
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<pre style="margin: 0;"> <span id="LC2504" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2505" class="line" lang="haskell">                  <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>
</pre>
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2499
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<td class="diff-line-num new_line" data-linenumber="2506" 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">
2506
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<pre style="margin: 0;"> <span id="LC2506" class="line" lang="haskell"></span>
</pre>
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2500
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<td class="diff-line-num new_line old" data-linenumber="2507" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2500" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- We must return these separately, because all the zonking below</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2501" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2501
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<td class="diff-line-num new_line old" data-linenumber="2507" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2501" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- might change the name of a TyVarTv. This, in turn, causes trouble</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2502" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2502
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<td class="diff-line-num new_line old" data-linenumber="2507" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2502" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- in partial type signatures that bind scoped type variables, as</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2503" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2503
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<td class="diff-line-num new_line old" data-linenumber="2507" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2503" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- we bring the wrong name into scope in the function body.</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2504" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2504
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<td class="diff-line-num new_line old" data-linenumber="2507" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2504" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- Test case: partial-sigs/should_compile/LocalDefinitionBug</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2505" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2505
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<td class="diff-line-num new_line old" data-linenumber="2507" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2505" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv_names</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_hs_tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">explicit_hs_tvs</span></span>
</pre>
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2506
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<td class="diff-line-num new_line old" data-linenumber="2507" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2506" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2507" 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">
2507
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<td class="diff-line-num new_line" data-linenumber="2507" 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">
2507
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<pre style="margin: 0;"> <span id="LC2507" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Spit out the wildcards (including the extra-constraints one)</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2508" 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">
2508
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<td class="diff-line-num new_line" data-linenumber="2508" 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">
2508
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<pre style="margin: 0;"> <span id="LC2508" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- as "hole" constraints, so that they'll be reported if necessary</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2509" 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">
2509
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<td class="diff-line-num new_line" data-linenumber="2509" 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">
2509
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<pre style="margin: 0;"> <span id="LC2509" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [Extra-constraint holes in partial type signatures]</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2510" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2510
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<td class="diff-line-num new_line old" data-linenumber="2510" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2510" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">emitWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="2511" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="2510" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2510
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<pre style="margin: 0;">+<span id="LC2510" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">emit<span class="idiff left right">Named</span>WildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs</span></span>
</pre>
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2511
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<td class="diff-line-num new_line" data-linenumber="2511" 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">
2511
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<pre style="margin: 0;"> <span id="LC2511" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2512
</td>
<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2512" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- The TyVarTvs created above will sometimes have too high a TcLevel</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2513" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2513
</td>
<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2513" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- (note that they are generated *after* bumping the level in</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2514" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2514
</td>
<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2514" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- the tc{Im,Ex}plicitTKBndrsSig functions. Bumping the level</span></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="2515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2515
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<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2515" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- is still important here, because the kinds of these variables</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2516" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2516
</td>
<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2516" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- do indeed need to have the higher level, so they can unify</span></span>
</pre>
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2517
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<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2517" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- with other local type variables. But, now that we've type-checked</span></span>
</pre>
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2518
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<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2518" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- everything (and solved equalities in the tcImplicit call)</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2519" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2519
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<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2519" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- we need to promote the TyVarTvs so we don't violate the TcLevel</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2520" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2520
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<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2520" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- invariant</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2521" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2521
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<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2521" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">implicit_tvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkAndScopedSort</span> <span class="n" style="color: #333;">implicit_tvs</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2522" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2522
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<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2522" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">explicit_tvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">zonkAndSkolemise</span> <span class="n" style="color: #333;">explicit_tvs</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2523" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2523
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<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2523" class="line" lang="haskell">       <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;">mapM</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">theta</span></span>
</pre>
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2524
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<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2524" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">tau</span>          <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">tau</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2525" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2525
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<td class="diff-line-num new_line old" data-linenumber="2512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2525" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2526" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2526
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<pre style="margin: 0;">-<span id="LC2526" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">explicit_tvs</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2527" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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2512
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<pre style="margin: 0;">+<span id="LC2512" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- We return a proper (Name,TyVar) environment, to be sure that</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2513" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2513
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<pre style="margin: 0;">+<span id="LC2513" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- we bring the right name into scope in the function body.</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2527" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="2514" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2514
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<pre style="margin: 0;">+<span id="LC2514" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- Test case: partial-sigs/should_compile/LocalDefinitionBug</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2515
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<pre style="margin: 0;">+<span id="LC2515" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv_prs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">implicit_hs_tvs</span>                  <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">implicit_tvs</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2527" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="2516" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2516
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<pre style="margin: 0;">+<span id="LC2516" class="line" lang="haskell">                      <span class="o" style="font-weight: 600;">++</span> <span class="p">(</span><span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">explicit_hs_tvs</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">explicit_tvs</span><span class="p">)</span></span>
</pre>
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2527
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<td class="diff-line-num new_line" data-linenumber="2517" 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">
2517
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<pre style="margin: 0;"> <span id="LC2517" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2528" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2528
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<td class="diff-line-num new_line old" data-linenumber="2518" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2528" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">checkValidType</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="n" style="color: #333;">mkSpecForAllTys</span> <span class="n" style="color: #333;">all_tvs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkPhiTy</span> <span class="n" style="color: #333;">theta</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2529" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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2518
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<pre style="margin: 0;">+<span id="LC2518" class="line" lang="haskell">      <span class="c1" style="color: #998; font-style: italic;">-- NB: checkValidType on the final inferred type will be</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2529" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="2519" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2519
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<pre style="margin: 0;">+<span id="LC2519" class="line" lang="haskell">      <span class="c1" style="color: #998; font-style: italic;">--     done later by checkInferredPolyId.  We can't do it</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2529" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="2520" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2520
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<pre style="margin: 0;">+<span id="LC2520" class="line" lang="haskell">      <span class="c1" style="color: #998; font-style: italic;">--     here because we don't have a complete tuype to check</span></span>
</pre>
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2529
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<td class="diff-line-num new_line" data-linenumber="2521" 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">
2521
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<pre style="margin: 0;"> <span id="LC2521" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2530" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2530
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<td class="diff-line-num new_line old" data-linenumber="2522" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2530" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcHsPartialSigType"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left right">all_tv</span>s</span><span class="p">)</span></span>
</pre>
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2531
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<td class="diff-line-num new_line old" data-linenumber="2522" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2531" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">tv_<span class="idiff left">names</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">all_tv</span>s</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2532" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="2522" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2522
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<pre style="margin: 0;">+<span id="LC2522" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcHsPartialSigType"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left right">tv_pr</span>s</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2532" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="2523" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2523" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">tv_<span class="idiff left right">pr</span>s</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>
</pre>
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2532
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<td class="diff-line-num new_line" data-linenumber="2524" 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">
2524
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<pre style="margin: 0;"> <span id="LC2524" class="line" lang="haskell"></span>
</pre>
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2533
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<td class="diff-line-num new_line" data-linenumber="2525" 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">
2525
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<pre style="margin: 0;"> <span id="LC2525" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsPartialSigType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsImplicitBndrs</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;">panic</span> <span class="s" style="color: #d14;">"tcHsPartialSigType"</span></span>
</pre>
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<td class="diff-line-num new_line" data-linenumber="2526" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2526" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsPartialSigType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsWildCardBndrs</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;">panic</span> <span class="s" style="color: #d14;">"tcHsPartialSigType"</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2538" 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="2530" 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">@@ -2538,14 +2530,43 @@ tcPartialContext hs_theta</td>
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<pre style="margin: 0;"> <span id="LC2530" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">hs_theta1</span><span class="p">,</span> <span class="n" style="color: #333;">hs_ctxt_last</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">snocView</span> <span class="n" style="color: #333;">hs_theta</span></span>
</pre>
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2539
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2531
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<pre style="margin: 0;"> <span id="LC2531" class="line" lang="haskell">  <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">wc_loc</span> <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWildCardTy</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;">ignoreParens</span> <span class="n" style="color: #333;">hs_ctxt_last</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC2532" 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;">wc_tv_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">wc_loc</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2541" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<td class="diff-line-num new_line old" data-linenumber="2533" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2541" class="line" lang="haskell">                     <span class="n" style="color: #333;">tcWildCardOcc</span> <span class="n" style="color: #333;">wc</span> <span class="n" style="color: #333;">constraintKind</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2542" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<pre style="margin: 0;">+<span id="LC2533" class="line" lang="haskell">                     <span class="n" style="color: #333;">tc<span class="idiff left right">Anon</span>WildCardOcc</span> <span class="n" style="color: #333;">wc</span> <span class="n" style="color: #333;">constraintKind</span></span>
</pre>
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2542
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2534
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<pre style="margin: 0;"> <span id="LC2534" class="line" lang="haskell">       <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;">mapM</span> <span class="n" style="color: #333;">tcLHsPredType</span> <span class="n" style="color: #333;">hs_theta1</span></span>
</pre>
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2543
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<td class="diff-line-num new_line" data-linenumber="2535" 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">
2535
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<pre style="margin: 0;"> <span id="LC2535" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">wc_tv_ty</span><span class="p">)</span> <span class="p">}</span></span>
</pre>
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2544
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<td class="diff-line-num new_line" data-linenumber="2536" 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">
2536
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<pre style="margin: 0;"> <span id="LC2536" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
</pre>
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2545
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<td class="diff-line-num new_line" data-linenumber="2537" 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">
2537
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<pre style="margin: 0;"> <span id="LC2537" 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;">theta</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">tcLHsPredType</span> <span class="n" style="color: #333;">hs_theta</span></span>
</pre>
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2546
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<td class="diff-line-num new_line" data-linenumber="2538" 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">
2538
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<pre style="margin: 0;"> <span id="LC2538" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="p">}</span></span>
</pre>
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2547
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<td class="diff-line-num new_line" data-linenumber="2539" 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">
2539
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<pre style="margin: 0;"> <span id="LC2539" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2548" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2548
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<td class="diff-line-num new_line old" data-linenumber="2540" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Extra-constraint holes in partial type signatures]</span></span>
</pre>
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2540
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<pre style="margin: 0;">+<span id="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Checking partial type signatures]</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2541" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2541
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<pre style="margin: 0;">+<span id="LC2541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2542" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2542
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<pre style="margin: 0;">+<span id="LC2542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Recipe for checking a signature]</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2543" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2543
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<pre style="margin: 0;">+<span id="LC2543" class="line" lang="haskell"></span>
</pre>
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2544
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<pre style="margin: 0;">+<span id="LC2544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we have a parital signature like</span></span>
</pre>
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2545
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<pre style="margin: 0;">+<span id="LC2545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   f,g :: forall a. a -> _</span></span>
</pre>
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2546
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<pre style="margin: 0;">+<span id="LC2546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we do the following</span></span>
</pre>
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2547
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<pre style="margin: 0;">+<span id="LC2547" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2549" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="2548" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2548
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<pre style="margin: 0;">+<span id="LC2548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* In TcSigs.tcUserSigType we return a PartialSig, which (unlike</span></span>
</pre>
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2549
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<pre style="margin: 0;">+<span id="LC2549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  the companion CompleteSig) contains the original, as-yet-unchecked</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2550" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  source-code LHsSigWcType</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2551" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2551
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<pre style="margin: 0;">+<span id="LC2551" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Then, for f and g /separately/, we call tcInstSig, which in turn</span></span>
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<pre style="margin: 0;">+<span id="LC2553" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  call tchsPartialSig (defined near this Note).  It kind-checks the</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  LHsSigWcType, creating fresh unification variables for each "_"</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2555" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  wildcard.  It's important that the wildcards for f and g are distinct</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2556" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  becase they migh get instantiated completely differently.  E.g.</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     f,g :: forall a. a -> _</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     f x = a</span></span>
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<pre style="margin: 0;">+<span id="LC2559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     g x = True</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2560" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  It's really as if we'd written two distinct signatures.</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2561" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Note that we don't make quantified type (forall a. blah) and then</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2563" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  instantiate it -- it makes no sense to instantiate a type with</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2564" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  wildcards in it.  Rather, tcHsPartialSigType just returns the</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2565" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2565" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  'a' and the 'blah' separately.</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2566" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2566" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  Nor, for the same reason, do we push a level in tcHsPartialSigType.</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2568" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2569" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2569" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Extra-constraint holes in partial type signatures]</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC2570" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC2571" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC2572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  f :: (_) => a -> a</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2614" 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="2635" 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">@@ -2614,12 +2635,12 @@ tcHsPatSigType ctxt sig_ty</td>
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<td class="diff-line-num new_line" data-linenumber="2635" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2635" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- Always solve local equalities if possible,</span></span>
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<td class="diff-line-num old_line" data-linenumber="2615" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="2636" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2636" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- else casts get in the way of deep skolemisation</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2616" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="2637" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2637" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- (#16033)</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2617" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<td class="diff-line-num new_line old" data-linenumber="2638" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2617" class="line" lang="haskell">               <span class="n" style="color: #333;">tcWildCardBinders</span> <span class="n" style="color: #333;">sig_wcs</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;">wcs</span> <span class="o" style="font-weight: 600;">-></span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2618" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="2638" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2638" class="line" lang="haskell">               <span class="n" style="color: #333;">tc<span class="idiff left right">Named</span>WildCardBinders</span> <span class="n" style="color: #333;">sig_wcs</span>        <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">wcs</span> <span class="o" style="font-weight: 600;">-></span></span>
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<td class="diff-line-num old_line" data-linenumber="2618" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="2639" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2639" class="line" lang="haskell">               <span class="n" style="color: #333;">tcExtendNameTyVarEnv</span> <span class="n" style="color: #333;">sig_tkv_prs</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2619" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="2640" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2640" class="line" lang="haskell">               <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsOpenType</span> <span class="n" style="color: #333;">hs_ty</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2620" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="2641" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2641" class="line" lang="haskell">                  <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="p">}</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2621" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="2642" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2642" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2622" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<td class="diff-line-num new_line old" data-linenumber="2643" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2622" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">emitWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2623" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="2643" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2643" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">emit<span class="idiff left right">Named</span>WildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs</span></span>
</pre>
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<td class="diff-line-num new_line" data-linenumber="2644" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2644" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2624" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="2645" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2645" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- sig_ty might have tyvars that are at a higher TcLevel (if hs_ty</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="2646" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2646" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- contains a forall). Promote these.</span></span>
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<li id="2799ba786adc98d485fad6003334b913a0069bdc">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#2799ba786adc98d485fad6003334b913a0069bdc"><strong>compiler/typecheck/TcRnDriver.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2437" 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="2437" 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">@@ -2437,8 +2437,8 @@ tcRnType hsc_env flexi normalise rdr_type</td>
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<pre style="margin: 0;"> <span id="LC2437" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcRnType"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rn_type</span><span class="p">])</span></span>
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2438
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<pre style="margin: 0;"> <span id="LC2438" class="line" lang="haskell">       <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">kind</span><span class="p">),</span> <span class="n" style="color: #333;">lie</span><span class="p">)</span>  <span class="o" style="font-weight: 600;"><-</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2439" 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">
2439
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<td class="diff-line-num new_line" data-linenumber="2439" 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">
2439
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<pre style="margin: 0;"> <span id="LC2439" class="line" lang="haskell">                       <span class="n" style="color: #333;">captureTopConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2440" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2440
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<td class="diff-line-num new_line old" data-linenumber="2440" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2440" class="line" lang="haskell">                       <span class="n" style="color: #333;">tcWildCardBinders</span> <span class="n" style="color: #333;">wcs</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;">wcs'</span> <span class="o" style="font-weight: 600;">-></span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2441" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2441
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<td class="diff-line-num new_line old" data-linenumber="2440" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2441" class="line" lang="haskell">                       <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">emitWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs'</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2442" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<pre style="margin: 0;">+<span id="LC2440" class="line" lang="haskell">                       <span class="n" style="color: #333;">tc<span class="idiff left right">Named</span>WildCardBinders</span> <span class="n" style="color: #333;">wcs</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;">wcs'</span> <span class="o" style="font-weight: 600;">-></span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2442" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="2441" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2441
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<pre style="margin: 0;">+<span id="LC2441" class="line" lang="haskell">                       <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">emit<span class="idiff left right">Named</span>WildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs'</span></span>
</pre>
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2442
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<td class="diff-line-num new_line" data-linenumber="2442" 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">
2442
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<pre style="margin: 0;"> <span id="LC2442" class="line" lang="haskell">                          <span class="p">;</span> <span class="n" style="color: #333;">tcLHsTypeUnsaturated</span> <span class="n" style="color: #333;">rn_type</span> <span class="p">}</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2443" 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">
2443
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<pre style="margin: 0;"> <span id="LC2443" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkNoErrs</span> <span class="p">(</span><span class="n" style="color: #333;">simplifyInteractive</span> <span class="n" style="color: #333;">lie</span><span class="p">)</span></span>
</pre>
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2444
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<td class="diff-line-num new_line" data-linenumber="2444" 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">
2444
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<pre style="margin: 0;"> <span id="LC2444" class="line" lang="haskell"></span>
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</li>
<li id="fa5bd207fd28db668d069147fd989ad2ac810fd7">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#fa5bd207fd28db668d069147fd989ad2ac810fd7"><strong>compiler/typecheck/TcRnMonad.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="104" 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="104" 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">@@ -104,7 +104,8 @@ module TcRnMonad(</td>
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell">  <span class="n" style="color: #333;">pushTcLevelM_</span><span class="p">,</span> <span class="n" style="color: #333;">pushTcLevelM</span><span class="p">,</span> <span class="n" style="color: #333;">pushTcLevelsM</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell">  <span class="n" style="color: #333;">getTcLevel</span><span class="p">,</span> <span class="n" style="color: #333;">setTcLevel</span><span class="p">,</span> <span class="n" style="color: #333;">isTouchableTcM</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="106" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="106" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell">  <span class="n" style="color: #333;">getLclTypeEnv</span><span class="p">,</span> <span class="n" style="color: #333;">setLclTypeEnv</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<td class="diff-line-num new_line old" data-linenumber="107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC107" class="line" lang="haskell">  <span class="n" style="color: #333;">traceTcConstraints</span><span class="p">,</span> <span class="n" style="color: #333;">emitWildCardHoleConstraints</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell">  <span class="n" style="color: #333;">traceTcConstraints</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell">  <span class="n" style="color: #333;">emitNamedWildCardHoleConstraints</span><span class="p">,</span> <span class="n" style="color: #333;">emitAnonWildCardHoleConstraint</span><span class="p">,</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="109" 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">
109
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="110" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- * Template Haskell context</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell">  <span class="n" style="color: #333;">recordThUse</span><span class="p">,</span> <span class="n" style="color: #333;">recordThSpliceUse</span><span class="p">,</span> <span class="n" style="color: #333;">recordTopLevelSpliceLoc</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">@@ -1688,8 +1689,16 @@ traceTcConstraints msg</td>
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<pre style="margin: 0;"> <span id="LC1689" class="line" lang="haskell">         <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="p">(</span><span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">++</span> <span class="s" style="color: #d14;">": LIE:"</span><span class="p">))</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lie</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1690" class="line" lang="haskell">       <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1691" class="line" lang="haskell"></span>
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<td class="diff-line-num new_line old" data-linenumber="1692" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1691" class="line" lang="haskell"><span class="n" style="color: #333;">emitWildCardHoleConstraints</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
</pre>
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<td class="diff-line-num new_line old" data-linenumber="1692" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1692" class="line" lang="haskell"><span class="n" style="color: #333;">emitWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1693" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<pre style="margin: 0;">+<span id="LC1692" class="line" lang="haskell"><span class="n" style="color: #333;">emitAnonWildCardHoleConstraint</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1693" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<pre style="margin: 0;">+<span id="LC1693" class="line" lang="haskell"><span class="n" style="color: #333;">emitAnonWildCardHoleConstraint</span> <span class="n" style="color: #333;">tv</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1693" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="1694" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1694" 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;">ct_loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCtLocM</span> <span class="kt" style="color: #458; font-weight: 600;">HoleOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC1695" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">emitInsolubles</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unitBag</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC1696" class="line" lang="haskell">         <span class="kt" style="color: #458; font-weight: 600;">CHoleCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC1697" class="line" lang="haskell">                                      <span class="p">,</span> <span class="n" style="color: #333;">ctev_loc</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct_loc</span> <span class="p">}</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="1698" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1698" class="line" lang="haskell">                  <span class="p">,</span> <span class="n" style="color: #333;">cc_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeHole</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarOcc</span> <span class="s" style="color: #d14;">"_"</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC1699" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC1700" class="line" lang="haskell"><span class="n" style="color: #333;">emitNamedWildCardHoleConstraints</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC1701" class="line" lang="haskell"><span class="n" style="color: #333;">emitNamedWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC1702" 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;">ct_loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCtLocM</span> <span class="kt" style="color: #458; font-weight: 600;">HoleOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1694" 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">
1694
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<td class="diff-line-num new_line" data-linenumber="1703" 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">
1703
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<pre style="margin: 0;"> <span id="LC1703" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">emitInsolubles</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">listToBag</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1695" 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">
1695
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<td class="diff-line-num new_line" data-linenumber="1704" 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">
1704
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<pre style="margin: 0;"> <span id="LC1704" class="line" lang="haskell">         <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">do_one</span> <span class="n" style="color: #333;">ct_loc</span><span class="p">)</span> <span class="n" style="color: #333;">wcs</span> <span class="p">}</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1702" 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="1711" 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">@@ -1702,7 +1711,7 @@ emitWildCardHoleConstraints wcs</td>
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<td class="diff-line-num old_line" data-linenumber="1702" 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">
1702
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<td class="diff-line-num new_line" data-linenumber="1711" 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">
1711
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<pre style="margin: 0;"> <span id="LC1711" class="line" lang="haskell">       <span class="kr" style="font-weight: 600;">where</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1703" 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">
1703
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<td class="diff-line-num new_line" data-linenumber="1712" 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">
1712
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<pre style="margin: 0;"> <span id="LC1712" class="line" lang="haskell">         <span class="n" style="color: #333;">real_span</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">nameSrcSpan</span> <span class="n" style="color: #333;">name</span> <span class="kr" style="font-weight: 600;">of</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1704" 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">
1704
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<td class="diff-line-num new_line" data-linenumber="1713" 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">
1713
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<pre style="margin: 0;"> <span id="LC1713" class="line" lang="haskell">                           <span class="kt" style="color: #458; font-weight: 600;">RealSrcSpan</span> <span class="n" style="color: #333;">span</span>  <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">span</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="1705" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1705
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<td class="diff-line-num new_line old" data-linenumber="1714" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1705" class="line" lang="haskell">                           <span class="kt" style="color: #458; font-weight: 600;">UnhelpfulSpan</span> <span class="n" style="color: #333;">str</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"emitWildCardHoleConstraints"</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1706" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="1714" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1714
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<pre style="margin: 0;">+<span id="LC1714" class="line" lang="haskell">                           <span class="kt" style="color: #458; font-weight: 600;">UnhelpfulSpan</span> <span class="n" style="color: #333;">str</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"emit<span class="idiff left right">Named</span>WildCardHoleConstraints"</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1706" 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">
1706
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<td class="diff-line-num new_line" data-linenumber="1715" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1715
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<pre style="margin: 0;"> <span id="LC1715" class="line" lang="haskell">                                                      <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ftext</span> <span class="n" style="color: #333;">str</span><span class="p">))</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1707" 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">
1707
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<td class="diff-line-num new_line" data-linenumber="1716" 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">
1716
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<pre style="margin: 0;"> <span id="LC1716" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- Wildcards are defined locally, and so have RealSrcSpans</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1708" 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">
1708
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<td class="diff-line-num new_line" data-linenumber="1717" 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">
1717
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<pre style="margin: 0;"> <span id="LC1717" class="line" lang="haskell">         <span class="n" style="color: #333;">ct_loc'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setCtLocSpan</span> <span class="n" style="color: #333;">ct_loc</span> <span class="n" style="color: #333;">real_span</span></span>
</pre>
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<br>
</li>
<li id="d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813"><strong>compiler/typecheck/TcRnTypes.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1561" 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="1561" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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1561
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<td class="diff-line-num new_line" data-linenumber="1561" 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">
1561
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<pre style="margin: 0;"> <span id="LC1561" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- Extra-constraints wildcard to fill in, if any</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1562" 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">
1562
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<td class="diff-line-num new_line" data-linenumber="1562" 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">
1562
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<pre style="margin: 0;"> <span id="LC1562" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- If this exists, it is surely of the form (meta_tv |> co)</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1563" 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">
1563
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<td class="diff-line-num new_line" data-linenumber="1563" 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">
1563
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<pre style="margin: 0;"> <span id="LC1563" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- (where the co might be reflexive). This is filled in</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="1564" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1564
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<td class="diff-line-num new_line old" data-linenumber="1564" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1564" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- only from the return value of TcHsType.tcWildCardOcc</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1565" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="1564" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1564
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<pre style="margin: 0;">+<span id="LC1564" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- only from the return value of TcHsType.tc<span class="idiff left right">Anon</span>WildCardOcc</span></span>
</pre>
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1565
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<pre style="margin: 0;"> <span id="LC1565" class="line" lang="haskell">         <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1566" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [sig_inst_tau may be polymorphic]</span></span>
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<li id="341aef35ac370771edf59ec6b9fbb31507fa6f18">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#341aef35ac370771edf59ec6b9fbb31507fa6f18"><strong>compiler/typecheck/TcSigs.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="498" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -498,25 +498,14 @@ tcInstSig hs_sig@(PartialSig { psig_hs_ty = hs_ty</td>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell">                             <span class="p">,</span> <span class="n" style="color: #333;">sig_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span></span>
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<td class="diff-line-num new_line" data-linenumber="499" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span>  <span class="c1" style="color: #998; font-style: italic;">-- Set the binding site of the tyvars</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"Staring partial sig {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_sig</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC501" 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;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">tv_names</span><span class="p">,</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsPartialSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC502" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC503" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- Clone the quantified tyvars</span></span>
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504
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- Reason: we might have    f, g :: forall a. a -> _ -> a</span></span>
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505
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<td class="diff-line-num new_line old" data-linenumber="501" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC505" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">--         and we want it to behave exactly as if there were</span></span>
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<td class="diff-line-num new_line old" data-linenumber="501" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">--         two separate signatures.  Cloning here seems like</span></span>
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">--         the easiest way to do so, and is very similar to</span></span>
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508
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<td class="diff-line-num new_line old" data-linenumber="501" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC508" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">--         the tcInstType in the CompleteSig case</span></span>
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- See #14643</span></span>
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<pre style="margin: 0;">-<span id="LC510" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">tvs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVarTyVars</span> <span class="n" style="color: #333;">tvs</span></span>
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511
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<pre style="margin: 0;">-<span id="LC511" class="line" lang="haskell">                         <span class="c1" style="color: #998; font-style: italic;">-- Why newMetaTyVarTyVars?  See TcBinds</span></span>
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<pre style="margin: 0;">-<span id="LC512" class="line" lang="haskell">                         <span class="c1" style="color: #998; font-style: italic;">-- Note [Quantified variables in partial type signatures]</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="513" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
513
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<td class="diff-line-num new_line old" data-linenumber="501" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC513" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv_prs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_names</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">tvs'</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="514" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
514
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<td class="diff-line-num new_line old" data-linenumber="501" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC514" class="line" lang="haskell">             <span class="n" style="color: #333;">inst_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TISI</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_inst_sig</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_sig</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="501" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
501
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<pre style="margin: 0;">+<span id="LC501" 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;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsPartialSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_ty</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="502" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
502
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<pre style="margin: 0;">+<span id="LC502" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking partial type signatures] in TcHsType</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="503" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
503
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inst_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TISI</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_inst_sig</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_sig</span></span>
</pre>
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515
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<td class="diff-line-num new_line" data-linenumber="504" 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">
504
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<pre style="margin: 0;"> <span id="LC504" class="line" lang="haskell">                             <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_prs</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="516" 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">
516
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505
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="haskell">                             <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_wcs</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wcs</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="517" 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">
517
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<td class="diff-line-num new_line" data-linenumber="506" 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">
506
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell">                             <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_wcx</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wcx</span></span>
</pre>
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518
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<td class="diff-line-num new_line old" data-linenumber="507" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC518" class="line" lang="haskell">                             <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">substTysUnchecked</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">subst</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">theta</span></span>
</pre>
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519
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<td class="diff-line-num new_line old" data-linenumber="507" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC519" class="line" lang="haskell">                             <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_tau</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">substTyUnchecked</span></span><span class="idiff">  </span><span class="n" style="color: #333;"><span class="idiff">subst</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">tau</span> <span class="p">}</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="520" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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507
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="haskell">                             <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">theta</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="508" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
508
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<pre style="margin: 0;">+<span id="LC508" class="line" lang="haskell">                             <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_tau</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tau</span> <span class="p">}</span></span>
</pre>
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520
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<td class="diff-line-num new_line" data-linenumber="509" 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">
509
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"End partial sig }"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inst_sig</span><span class="p">)</span></span>
</pre>
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521
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510
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">inst_sig</span> <span class="p">}</span></span>
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511
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="haskell"></span>
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<li id="341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07"><strong>compiler/typecheck/TcType.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">@@ -1793,11 +1793,14 @@ hasTyVarHead ty                 -- Haskell 98 allows predicates of form</td>
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1793
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1793
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<pre style="margin: 0;"> <span id="LC1793" class="line" lang="haskell">       <span class="kt" style="color: #458; font-weight: 600;">Nothing</span>      <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1794" 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">
1794
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<td class="diff-line-num new_line" data-linenumber="1794" 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">
1794
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<pre style="margin: 0;"> <span id="LC1794" class="line" lang="haskell"></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1795" 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">
1795
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<td class="diff-line-num new_line" data-linenumber="1795" 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">
1795
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<pre style="margin: 0;"> <span id="LC1795" class="line" lang="haskell"><span class="n" style="color: #333;">evVarPred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="1796" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1796
</td>
<td class="diff-line-num new_line old" data-linenumber="1796" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1796" class="line" lang="haskell"><span class="n" style="color: #333;">evVarPred</span> <span class="n" style="color: #333;">var</span></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="1797" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1797
</td>
<td class="diff-line-num new_line old" data-linenumber="1796" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1797" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">isEvVarType</span> <span class="n" style="color: #333;">var_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">var_ty</span> <span class="p">)</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="1798" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1798
</td>
<td class="diff-line-num new_line old" data-linenumber="1796" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1798" class="line" lang="haskell">    <span class="n" style="color: #333;">var_ty</span></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="1799" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1799
</td>
<td class="diff-line-num new_line old" data-linenumber="1796" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1799" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="1800" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1800
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<td class="diff-line-num new_line old" data-linenumber="1796" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1800" class="line" lang="haskell">    <span class="n" style="color: #333;">var_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">var</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="1801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1796" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1796
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<pre style="margin: 0;">+<span id="LC1796" class="line" lang="haskell"><span class="n" style="color: #333;">evVarPred</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">var</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="1801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1797" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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;">-- Historical note: I used to have an ASSERT here,</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="1801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1798" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1798
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC1798" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- checking (isEvVarType (varType var)).  But with something like</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="1801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1799" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1799
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<pre style="margin: 0;">+<span id="LC1799" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">--   f :: c => _ -> _</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="1801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1800" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1800
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<pre style="margin: 0;">+<span id="LC1800" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- we end up with (c :: kappa), and (kappa ~ Constraint).  Until</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="1801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1801
</td>
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<pre style="margin: 0;">+<span id="LC1801" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- we solve and zonk (which there is no particular reason to do for</span></span>
</pre>
</td>
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<tr class="line_holder new" id="" style="line-height: 1.6;">
<td class="diff-line-num new old_line" data-linenumber="1801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1802" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1802
</td>
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<pre style="margin: 0;">+<span id="LC1802" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- partial signatures, (isEvVarType kappa) will return False. But</span></span>
</pre>
</td>
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<tr class="line_holder new" id="" style="line-height: 1.6;">
<td class="diff-line-num new old_line" data-linenumber="1801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="1803" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1803
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<pre style="margin: 0;">+<span id="LC1803" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- nothing is wrong.  So I just removed the ASSERT.</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1801" 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">
1801
</td>
<td class="diff-line-num new_line" data-linenumber="1804" 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">
1804
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1804" class="line" lang="haskell"></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1802" 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">
1802
</td>
<td class="diff-line-num new_line" data-linenumber="1805" 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">
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;">------------------</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1803" 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">
1803
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<td class="diff-line-num new_line" data-linenumber="1806" 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">
1806
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<pre style="margin: 0;"> <span id="LC1806" class="line" lang="haskell"><span class="cd">-- | When inferring types, should we quantify over a given predicate?</span></span>
</pre>
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</table>
<br>
</li>
<li id="fc93b26a3154f102f2bf16cf72ae4576f234d0f4">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#fc93b26a3154f102f2bf16cf72ae4576f234d0f4"><strong>testsuite/tests/partial-sigs/should_compile/T16728.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 PartialTypeSignatures #-}</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 PolyKinds #-}</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 ScopedTypeVariables #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">k</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span></span></pre>
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<li id="b16a1ffd67ffd8fd4e68341503bf44c581910108">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#b16a1ffd67ffd8fd4e68341503bf44c581910108"><strong>testsuite/tests/partial-sigs/should_compile/T16728.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16728.hs:8:37: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Found type wildcard ‘_’ standing for ‘k’</span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">      Where: ‘k’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">               the inferred type of f :: Proxy x</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">               at T16728.hs:9:1-9</span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">    • In the kind ‘_’</span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">      In the first argument of ‘Proxy’, namely ‘(x :: _)’</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">      In the type ‘Proxy (x :: _)’</span></pre>
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</li>
<li id="65238b2bc6d63b92c18503e1d45d68c4641cda65">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#65238b2bc6d63b92c18503e1d45d68c4641cda65"><strong>testsuite/tests/partial-sigs/should_compile/T16728a.hs</strong></a>
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1
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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, PartialTypeSignatures #-}</span></span>
</pre>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="3" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
</pre>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">g</span><span class="p">,</span><span class="n" style="color: #333;">h</span><span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">_</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="5" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
5
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">h</span> <span class="n" style="color: #333;">x</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="6" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
6
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
</pre>
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7
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span></span></pre>
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<td class="new_line diff-line-num" 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">\ No newline at end of file</td>
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<br>
</li>
<li id="8998d74383852482788d62775428d5c578125347">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#8998d74383852482788d62775428d5c578125347"><strong>testsuite/tests/partial-sigs/should_compile/T16728a.stderr</strong></a>
<hr>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
</pre>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16728a.hs:4:22: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="3" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Found type wildcard ‘_’ standing for ‘_’</span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="4" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">      Where: ‘_’ is a rigid type variable bound by</span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="5" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">               the inferred types of</span>
</pre>
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6
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">                 g :: a -> _</span>
</pre>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">                 h :: a -> _</span>
</pre>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">               at T16728a.hs:(5,1)-(7,9)</span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="9" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
9
</td>
<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">    • In the type ‘a -> _’</span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="0" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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10
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">      In the type signature: g :: forall a. a -> _</span>
</pre>
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11
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"></span>
</pre>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">T16728a.hs:4:22: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
</pre>
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13
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">    • Found type wildcard ‘_’ standing for ‘_’</span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="0" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="14" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
14
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">      Where: ‘_’ is a rigid type variable bound by</span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="15" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
15
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext">               the inferred types of</span>
</pre>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext">                 g :: a -> _</span>
</pre>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext">                 h :: a -> _</span>
</pre>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">               at T16728a.hs:(5,1)-(7,9)</span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="0" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="19" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext">    • In the type ‘a -> _’</span>
</pre>
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20
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext">      In the type signature: h :: forall a. a -> _</span></pre>
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<br>
</li>
<li id="d6d32f1b07f8052f82e7678e4a15e0cf57b827c1">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#d6d32f1b07f8052f82e7678e4a15e0cf57b827c1"><strong>testsuite/tests/partial-sigs/should_compile/T16728b.hs</strong></a>
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1
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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, PartialTypeSignatures #-}</span></span>
</pre>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
</pre>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
</pre>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">g</span><span class="p">,</span><span class="n" style="color: #333;">h</span><span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">_</span></span>
</pre>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
</pre>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span>       <span class="c1" style="color: #998; font-style: italic;">-- Instantiates the wildcard to 'a'</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
</pre>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">h</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;">True</span>    <span class="c1" style="color: #998; font-style: italic;">-- Instantiates the wildcard to Bool</span></span></pre>
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<td class="old_line diff-line-num" 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="new_line diff-line-num" 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">\ No newline at end of file</td>
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</li>
<li id="befe36efee69935add9af6dc4b7a849aa1be3241">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#befe36efee69935add9af6dc4b7a849aa1be3241"><strong>testsuite/tests/partial-sigs/should_compile/T16728b.stderr</strong></a>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
</pre>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16728b.hs:4:22: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
</pre>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Found type wildcard ‘_’ standing for ‘Bool’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">    • In the type ‘a -> _’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">      In the type signature: h :: forall a. a -> _</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">T16728b.hs:4:22: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">    • Found type wildcard ‘_’ standing for ‘a’</span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">      Where: ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">               the inferred type of g :: a -> a</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">               at T16728b.hs:6:1-7</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">    • In the type ‘a -> _’</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">      In the type signature: g :: forall a. a -> _</span></pre>
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<li id="638bf502d5c9ded68b185325d908464f7da3dcac">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#638bf502d5c9ded68b185325d908464f7da3dcac"><strong>testsuite/tests/partial-sigs/should_compile/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">@@ -92,3 +92,6 @@ test('T15039c', normal, compile, ['-fprint-equality-relations'])</td>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T15039d'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="perl">                <span class="p">[</span><span class="s" style="color: #d14;">'-fprint-explicit-kinds -fprint-equality-relations'</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16334'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16728'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16728a'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16728b'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span></pre>
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<li id="f745b3f653a464a3341ae5abc26753bc68ee88cd">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/bb5f015c8b8ac508c5fae54db0537c2a03fbcbb7#f745b3f653a464a3341ae5abc26753bc68ee88cd"><strong>testsuite/tests/partial-sigs/should_fail/T14040a.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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2
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T14040a.hs:34:8: error:</span>
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3
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext">    • Cannot apply expression of type ‘Sing wl<span class="idiff left right">0</span></span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext">                                       -> (forall y. p<span class="idiff left right">0 _0</span> 'WeirdNil)</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Cannot apply expression of type ‘Sing wl</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">                                       -> (forall y. p<span class="idiff left right"> _2</span> 'WeirdNil)</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">                                       -> (forall z1 (x :: z1) (xs :: WeirdList (WeirdList z1)).</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext">                                           Sing x -> Sing xs -> p<span class="idiff left right">0 _1 xs -> p0 _2</span> ('WeirdCons x xs))</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">                                       -> p<span class="idiff left right">0 _3 wl0</span>’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">                                           Sing x -> Sing xs -> p<span class="idiff left right"> _0 xs -> p _1</span> ('WeirdCons x xs))</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">                                       -> p<span class="idiff left right"> _2 wl</span>’</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext">      to a visible type argument ‘(WeirdList z)’</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">    • In the sixth argument of ‘pWeirdCons’, namely</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">        ‘(elimWeirdList @(WeirdList z) @xs @p xs pWeirdNil pWeirdCons)’</span>
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