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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/3c9b57b07fa1d4a5fa69fb77ee8e49f7a0b6ada9">3c9b57b0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-06-20T02:15:39Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix two places that failed the substitution invariant
The substition invariant relies on keeping the in-scope
set in sync, and we weren't always doing so, which means that
a DEBUG compiler crashes sometimes with an assertion failure
This patch fixes a couple more cases. Still not validate
clean (with -DEEBUG) but closer!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/48fb3482f8cbc8a4b37161021e846105f980eed4">48fb3482</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-06-20T02:15:39Z</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>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/3ae23992786c7ea3211ab6f13e1d61a5edfe5952">3ae23992</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-06-20T02:15:39Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments and tiny refactor
* Added Note [Quantified varaibles in partial type signatures]
in TcRnTypes
* Kill dVarSetElemsWellScoped; it was only called in
one function, quantifyTyVars. I inlined it because it
was only scopedSort . dVarSetElems
* Kill Type.tyCoVarsOfBindersWellScoped, never called.
</pre>
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</ul>
<h4>21 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#80d26d5d3ff0c380bfa505239d3192d66657fe32">
compiler/rename/RnTypes.hs
</a>
</li>
<li class="file-stats">
<a href="#c445afcfc673671d106f586e133959854186d16b">
compiler/typecheck/Inst.hs
</a>
</li>
<li class="file-stats">
<a href="#a83766f600de0ac03e19fb4b379bc90111dc73a5">
compiler/typecheck/TcBinds.hs
</a>
</li>
<li class="file-stats">
<a href="#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
compiler/typecheck/TcCanonical.hs
</a>
</li>
<li class="file-stats">
<a href="#3668e5951898e1cee434d7e6fb5a139287ebe70d">
compiler/typecheck/TcExpr.hs
</a>
</li>
<li class="file-stats">
<a href="#350c4076427c611b8f14e875a4ca553041c2b847">
compiler/typecheck/TcHsType.hs
</a>
</li>
<li class="file-stats">
<a href="#367db94fc37c8c7548dbe545a5302c7a5108e41e">
compiler/typecheck/TcMType.hs
</a>
</li>
<li class="file-stats">
<a href="#2799ba786adc98d485fad6003334b913a0069bdc">
compiler/typecheck/TcRnDriver.hs
</a>
</li>
<li class="file-stats">
<a href="#fa5bd207fd28db668d069147fd989ad2ac810fd7">
compiler/typecheck/TcRnMonad.hs
</a>
</li>
<li class="file-stats">
<a href="#d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813">
compiler/typecheck/TcRnTypes.hs
</a>
</li>
<li class="file-stats">
<a href="#341aef35ac370771edf59ec6b9fbb31507fa6f18">
compiler/typecheck/TcSigs.hs
</a>
</li>
<li class="file-stats">
<a href="#341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07">
compiler/typecheck/TcType.hs
</a>
</li>
<li class="file-stats">
<a href="#07ce9a046fb8ea6659690020b0a8551d94cfdf1c">
compiler/types/Type.hs
</a>
</li>
<li class="file-stats">
<a href="#fc93b26a3154f102f2bf16cf72ae4576f234d0f4">
<span class="new-file">
+
testsuite/tests/partial-sigs/should_compile/T16728.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#b16a1ffd67ffd8fd4e68341503bf44c581910108">
<span class="new-file">
+
testsuite/tests/partial-sigs/should_compile/T16728.stderr
</span>
</a>
</li>
<li class="file-stats">
<a href="#65238b2bc6d63b92c18503e1d45d68c4641cda65">
<span class="new-file">
+
testsuite/tests/partial-sigs/should_compile/T16728a.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#8998d74383852482788d62775428d5c578125347">
<span class="new-file">
+
testsuite/tests/partial-sigs/should_compile/T16728a.stderr
</span>
</a>
</li>
<li class="file-stats">
<a href="#d6d32f1b07f8052f82e7678e4a15e0cf57b827c1">
<span class="new-file">
+
testsuite/tests/partial-sigs/should_compile/T16728b.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#befe36efee69935add9af6dc4b7a849aa1be3241">
<span class="new-file">
+
testsuite/tests/partial-sigs/should_compile/T16728b.stderr
</span>
</a>
</li>
<li class="file-stats">
<a href="#638bf502d5c9ded68b185325d908464f7da3dcac">
testsuite/tests/partial-sigs/should_compile/all.T
</a>
</li>
<li class="file-stats">
<a href="#f745b3f653a464a3341ae5abc26753bc68ee88cd">
testsuite/tests/partial-sigs/should_fail/T14040a.stderr
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="80d26d5d3ff0c380bfa505239d3192d66657fe32">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#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">
693
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<td class="diff-line-num 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">
693
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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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<td class="diff-line-num old_line" data-linenumber="694" 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">
694
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<td class="diff-line-num new_line" data-linenumber="694" 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">
694
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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>
</pre>
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<td class="diff-line-num old_line" data-linenumber="695" 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">
695
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<td class="diff-line-num new_line" data-linenumber="695" 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">
695
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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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<tr class="line_holder old" id="" style="line-height: 1.6;">
<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">
696
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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">
697
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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">
696
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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">
697
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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>
</pre>
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698
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698
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"></span>
</pre>
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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">
699
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<td class="diff-line-num new_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">
699
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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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<td class="diff-line-num old_line" data-linenumber="700" 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">
700
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<td class="diff-line-num new_line" data-linenumber="700" 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">
700
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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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<td class="diff-line-num 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">
714
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<td class="diff-line-num 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">
714
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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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<td class="diff-line-num old_line" data-linenumber="715" 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">
715
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<td class="diff-line-num new_line" data-linenumber="715" 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="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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<td class="diff-line-num old_line" data-linenumber="716" 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">
716
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<td class="diff-line-num new_line" data-linenumber="716" 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="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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<td class="diff-line-num old old_line" 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">
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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<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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<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>
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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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<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>
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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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<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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<pre style="margin: 0;"> <span id="LC723" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#c445afcfc673671d106f586e133959854186d16b"><strong>compiler/typecheck/Inst.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">@@ -297,24 +297,23 @@ instTyVarsWith :: CtOrigin -> [TyVar] -> [TcType] -> TcM TCvSubst</td>
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If they don't match, emit a kind-equality to promise that they will</span></span>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- eventually do so, and thus make a kind-homongeneous substitution.</span></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"><span class="n" style="color: #333;">instTyVarsWith</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC300" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">empty<span class="idiff left right">_s</span>ubst</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">empty<span class="idiff left right">TCvS</span>ubst</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">tys</span></span>
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301
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC302" class="line" lang="haskell"> <span class="n" style="color: #333;">empty_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="p">(</span><span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">tys</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC303" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">subst</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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305
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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307
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv_kind</span> <span class="p">`</span><span class="n" style="color: #333;">tcEqType</span><span class="p">`</span> <span class="n" style="color: #333;">ty_kind</span></span>
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308
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<pre style="margin: 0;">-<span id="LC308" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">extendT<span class="idiff left right">CvSubst</span></span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">extendT<span class="idiff left right">vSubstAndInScope</span></span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC307" 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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308
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<pre style="margin: 0;"> <span id="LC308" 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;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">emitWantedEq</span> <span class="n" style="color: #333;">orig</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty_kind</span> <span class="n" style="color: #333;">tv_kind</span></span>
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<pre style="margin: 0;">-<span id="LC311" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">extendT<span class="idiff left right">CvSubst</span></span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">co</span><span class="p">))</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">tys</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">extendT<span class="idiff left right">vSubstAndInScope</span></span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">co</span><span class="p">))</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">tys</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC310" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC311" class="line" lang="haskell"> <span class="n" style="color: #333;">tv_kind</span> <span class="o" style="font-weight: 600;">=</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;">tv</span><span class="p">)</span></span>
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314
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<pre style="margin: 0;"> <span id="LC312" class="line" lang="haskell"> <span class="n" style="color: #333;">ty_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC314" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"instTysWith"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC317" 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="LC318" 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="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#a83766f600de0ac03e19fb4b379bc90111dc73a5"><strong>compiler/typecheck/TcBinds.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">@@ -1020,7 +1020,7 @@ chooseInferredQuantifiers inferred_theta tau_tvs qtvs</td>
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"></span>
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1021
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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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<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>
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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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<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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<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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<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>
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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>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a"><strong>compiler/typecheck/TcCanonical.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">@@ -1007,8 +1007,10 @@ can_eq_nc_forall ev eq_rel s1 s2</td>
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1007
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<pre style="margin: 0;"> <span id="LC1007" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binderVar</span> <span class="n" style="color: #333;">bndr2</span></span>
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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="p">(</span><span class="n" style="color: #333;">kind_co</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">skol_tv</span><span class="p">)</span></span>
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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="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>
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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="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;">extendTvSubst</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv2</span></span>
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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="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;">extendTvSubst<span class="idiff left right">AndInScope</span></span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv2</span></span>
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1011
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1011
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<pre style="margin: 0;"> <span id="LC1011" 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>
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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;">-- skol_tv is already in the in-scope set, but the</span></span>
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<pre style="margin: 0;">+<span id="LC1013" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- free vars of kind_co are not; hence "...AndInScope"</span></span>
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1014
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<pre style="margin: 0;"> <span id="LC1014" 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>
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">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>
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">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>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#3668e5951898e1cee434d7e6fb5a139287ebe70d"><strong>compiler/typecheck/TcExpr.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">@@ -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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<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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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">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>
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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>
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382
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"></span>
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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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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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<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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<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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<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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<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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<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>
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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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<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>
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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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<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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<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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<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>
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"></span>
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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>
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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>
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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 id="350c4076427c611b8f14e875a4ca553041c2b847">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#350c4076427c611b8f14e875a4ca553041c2b847"><strong>compiler/typecheck/TcHsType.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">@@ -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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<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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<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">@@ -387,7 +387,7 @@ tcHsTypeApp wc_ty kind</td>
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387
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<pre style="margin: 0;"> <span id="LC387" 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;">$</span></span>
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388
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"> <span class="n" style="color: #333;">setXOptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">PartialTypeSignatures</span> <span class="o" style="font-weight: 600;">$</span></span>
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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;">-- See Note [Wildcards in visible type application]</span></span>
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390
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<pre style="margin: 0;">-<span id="LC390" class="line" lang="haskell"> <span class="n" style="color: #333;">tcWildCardBinders</span> <span class="n" style="color: #333;">sig_wcs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"> <span class="n" style="color: #333;">tc<span class="idiff left right">Named</span>WildCardBinders</span> <span class="n" style="color: #333;">sig_wcs</span> <span class="o" style="font-weight: 600;">$</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="LC391" 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="LC392" 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="LC393" 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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -402,18 +402,19 @@ tcHsTypeApp (XHsWildCardBndrs _) _ = panic "tcHsTypeApp"</td>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC403" 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="LC404" 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="LC405" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC406" 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="LC407" 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="LC408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will call emitWildCardHoleConstraints on them. However, this would trigger</span></span>
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">error/warning when an unnamed wildcard is passed in as a visible type argument,</span></span>
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<pre style="margin: 0;">-<span id="LC410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which we do not want because users should be able to write @_ to skip a instantiating</span></span>
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<pre style="margin: 0;">-<span id="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a type variable variable without fuss. The solution is to switch the</span></span>
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<pre style="margin: 0;">-<span id="LC412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">PartialTypeSignatures flags here to let the typechecker know that it's checking</span></span>
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<pre style="margin: 0;">-<span id="LC413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a '@_' and do not emit hole constraints on it.</span></span>
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<pre style="margin: 0;">-<span id="LC414" 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="LC415" 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="LC416" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A HsWildCardBndrs's hswc_ext now only includes /named/ wildcards, so</span></span>
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<pre style="margin: 0;">+<span id="LC406" 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="LC407" 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="LC408" 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="LC409" 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>
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<pre style="margin: 0;">+<span id="LC410" 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>
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<pre style="margin: 0;">+<span id="LC411" 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>
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<pre style="margin: 0;">+<span id="LC412" 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>
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413
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<pre style="margin: 0;">+<span id="LC413" 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>
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414
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<pre style="margin: 0;">+<span id="LC414" 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="LC415" 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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<pre style="margin: 0;">+<span id="LC416" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ugh!</span></span>
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<pre style="margin: 0;"> <span id="LC418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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419
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<pre style="margin: 0;"> <span id="LC419" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -829,7 +830,7 @@ tc_hs_type mode ty@(HsAppKindTy{}) ek = tc_infer_hs_type_ek mode ty ek</td>
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<pre style="margin: 0;"> <span id="LC830" 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>
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831
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"><span class="n" style="color: #333;">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>
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832
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"><span class="n" style="color: #333;">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>
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832
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<pre style="margin: 0;">-<span id="LC832" class="line" lang="haskell"><span class="n" style="color: #333;">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>
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<pre style="margin: 0;">+<span id="LC833" 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>
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834
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"></span>
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835
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------</span></span>
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836
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<pre style="margin: 0;"> <span id="LC836" 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>
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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">@@ -849,18 +850,18 @@ tc_fun_type mode ty1 ty2 exp_kind = case mode_level mode of</td>
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<pre style="margin: 0;"> <span id="LC850" 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>
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC852" 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>
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<pre style="margin: 0;">-<span id="LC853" 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>
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<pre style="margin: 0;">-<span id="LC854" 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>
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<pre style="margin: 0;">-<span id="LC855" 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>
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<pre style="margin: 0;">-<span id="LC856" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getSrcSpanM</span></span>
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<pre style="margin: 0;">-<span id="LC857" 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>
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<pre style="margin: 0;">-<span id="LC858" 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>
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<pre style="margin: 0;">+<span id="LC853" 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>
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<pre style="margin: 0;">+<span id="LC854" 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>
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<pre style="margin: 0;">+<span id="LC855" 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>
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC857" 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>
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<pre style="margin: 0;"> <span id="LC858" 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>
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<pre style="margin: 0;">-<span id="LC861" 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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<pre style="margin: 0;">-<span id="LC862" 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>
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<pre style="margin: 0;">-<span id="LC863" 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>
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC860" 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="LC861" 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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<pre style="margin: 0;">+<span id="LC862" 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="LC863" 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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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC865" 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="LC866" 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="LC867" 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">@@ -877,11 +878,11 @@ x = MkT</td>
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<pre style="margin: 0;"> <span id="LC878" 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="LC879" 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="LC880" 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="LC880" 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="LC881" 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="LC882" 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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<pre style="margin: 0;">-<span id="LC882" 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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<pre style="margin: 0;">+<span id="LC883" 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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<pre style="margin: 0;"> <span id="LC884" 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="LC884" 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="LC885" 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>
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<pre style="margin: 0;"> <span id="LC886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">under these conditions.</span></span>
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<pre style="margin: 0;"> <span id="LC887" 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="LC888" 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">@@ -1722,23 +1723,26 @@ To avoid the double-zonk, we do two things:</td>
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<pre style="margin: 0;"> <span id="LC1723" 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="LC1724" 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="LC1725" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1725" 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="LC1726" 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="LC1727" 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="LC1728" 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="LC1726" 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>
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<pre style="margin: 0;">+<span id="LC1727" 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="LC1728" 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="LC1729" 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="LC1730" 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="LC1731" 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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<pre style="margin: 0;">+<span id="LC1732" 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>
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<pre style="margin: 0;"> <span id="LC1733" 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>
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<pre style="margin: 0;"> <span id="LC1734" 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>
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<pre style="margin: 0;"> <span id="LC1735" 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>
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<pre style="margin: 0;"> <span id="LC1736" 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>
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<pre style="margin: 0;"> <span id="LC1737" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1738" 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>
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<pre style="margin: 0;">-<span id="LC1735" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ New unification variable for a wildcard</span></span>
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<pre style="margin: 0;">+<span id="LC1739" 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>
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"><span class="n" style="color: #333;">newWildTyVar</span></span>
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<pre style="margin: 0;"> <span id="LC1741" 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>
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<pre style="margin: 0;"> <span id="LC1742" 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>
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1743
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<pre style="margin: 0;"> <span id="LC1743" 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>
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<pre style="margin: 0;">-<span id="LC1740" 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>
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<pre style="margin: 0;">-<span id="LC1741" 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>
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<pre style="margin: 0;">+<span id="LC1744" 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>
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<pre style="margin: 0;">+<span id="LC1745" 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>
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<pre style="margin: 0;"> <span id="LC1746" 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="LC1747" 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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1748
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<pre style="margin: 0;"> <span id="LC1748" 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">@@ -2490,11 +2494,11 @@ tcHsPartialSigType</td>
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2494
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<pre style="margin: 0;"> <span id="LC2494" 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="LC2495" 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="LC2496" 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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<pre style="margin: 0;">-<span id="LC2493" 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="LC2494" 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="LC2497" 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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<pre style="margin: 0;">+<span id="LC2498" 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="LC2499" 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="LC2500" 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="LC2497" 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="LC2501" 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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2502
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<pre style="margin: 0;"> <span id="LC2502" 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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2503
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<pre style="margin: 0;"> <span id="LC2503" 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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2504
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<pre style="margin: 0;"> <span id="LC2504" 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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2502,8 +2506,11 @@ tcHsPartialSigType ctxt sig_ty</td>
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2506
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<pre style="margin: 0;"> <span id="LC2506" 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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2507
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<pre style="margin: 0;"> <span id="LC2507" 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;">$</span></span>
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2504
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2508
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<pre style="margin: 0;"> <span id="LC2508" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">implicit_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">explicit_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)))</span></span>
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<pre style="margin: 0;">-<span id="LC2505" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveLocalEqualities</span> <span class="s" style="color: #d14;">"tcHsPatSigTypes"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC2506" 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;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">wcs</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC2509" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveLocalEqualities</span> <span class="s" style="color: #d14;">"tcHsPartialSigType"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2510" 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="LC2511" 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="LC2512" 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="LC2513" 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;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">wcs</span> <span class="o" style="font-weight: 600;">-></span></span>
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2514
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<pre style="margin: 0;"> <span id="LC2514" class="line" lang="haskell"> <span class="n" style="color: #333;">bindImplicitTKBndrs_Tv</span> <span class="n" style="color: #333;">implicit_hs_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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2508
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2515
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<pre style="margin: 0;"> <span id="LC2515" 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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2509
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2516
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<pre style="margin: 0;"> <span id="LC2516" 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">@@ -2514,38 +2521,23 @@ tcHsPartialSigType ctxt sig_ty</td>
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2521
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<pre style="margin: 0;"> <span id="LC2521" class="line" lang="haskell"></span>
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2515
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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;">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>
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2516
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2523
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<pre style="margin: 0;"> <span id="LC2523" class="line" lang="haskell"></span>
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2517
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<pre style="margin: 0;">-<span id="LC2517" 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>
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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;">-- might change the name of a TyVarTv. This, in turn, causes trouble</span></span>
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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;">-- in partial type signatures that bind scoped type variables, as</span></span>
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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;">-- we bring the wrong name into scope in the function body.</span></span>
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2521
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<pre style="margin: 0;">-<span id="LC2521" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Test case: partial-sigs/should_compile/LocalDefinitionBug</span></span>
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2522
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<pre style="margin: 0;">-<span id="LC2522" 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>
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2523
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<pre style="margin: 0;">-<span id="LC2523" class="line" lang="haskell"></span>
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2524
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2524
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<pre style="margin: 0;"> <span id="LC2524" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Spit out the wildcards (including the extra-constraints one)</span></span>
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2525
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2525
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<pre style="margin: 0;"> <span id="LC2525" 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>
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2526
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2526
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<pre style="margin: 0;"> <span id="LC2526" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Extra-constraint holes in partial type signatures]</span></span>
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2527
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<pre style="margin: 0;">-<span id="LC2527" 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>
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2527
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<pre style="margin: 0;">+<span id="LC2527" 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>
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2528
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2528
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<pre style="margin: 0;"> <span id="LC2528" class="line" lang="haskell"></span>
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2529
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<pre style="margin: 0;">-<span id="LC2529" 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>
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2530
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<pre style="margin: 0;">-<span id="LC2530" 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>
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2531
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<pre style="margin: 0;">-<span id="LC2531" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the tc{Im,Ex}plicitTKBndrsSig functions. Bumping the level</span></span>
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2532
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<pre style="margin: 0;">-<span id="LC2532" 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>
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2533
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<pre style="margin: 0;">-<span id="LC2533" 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>
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2534
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<pre style="margin: 0;">-<span id="LC2534" 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>
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2535
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<pre style="margin: 0;">-<span id="LC2535" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- everything (and solved equalities in the tcImplicit call)</span></span>
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2536
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<pre style="margin: 0;">-<span id="LC2536" 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>
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<pre style="margin: 0;">-<span id="LC2537" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- invariant</span></span>
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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;">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>
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2539
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<pre style="margin: 0;">-<span id="LC2539" 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>
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2540
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<pre style="margin: 0;">-<span id="LC2540" 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>
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2541
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<pre style="margin: 0;">-<span id="LC2541" 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>
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2542
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<pre style="margin: 0;">-<span id="LC2542" class="line" lang="haskell"></span>
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2543
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<pre style="margin: 0;">-<span id="LC2543" 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>
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<pre style="margin: 0;">+<span id="LC2529" 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>
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2530
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<pre style="margin: 0;">+<span id="LC2530" 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>
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2531
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<pre style="margin: 0;">+<span id="LC2531" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Test case: partial-sigs/should_compile/LocalDefinitionBug</span></span>
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2532
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<pre style="margin: 0;">+<span id="LC2532" 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>
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<pre style="margin: 0;">+<span id="LC2533" 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>
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2544
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2534
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<pre style="margin: 0;"> <span id="LC2534" class="line" lang="haskell"></span>
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2545
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<pre style="margin: 0;">-<span id="LC2545" 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>
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<pre style="margin: 0;">+<span id="LC2535" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: checkValidType on the final inferred type will be</span></span>
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2536
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<pre style="margin: 0;">+<span id="LC2536" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- done later by checkInferredPolyId. We can't do it</span></span>
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<pre style="margin: 0;">+<span id="LC2537" 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>
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2546
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2538
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<pre style="margin: 0;"> <span id="LC2538" class="line" lang="haskell"></span>
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2547
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<pre style="margin: 0;">-<span id="LC2547" 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>
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2548
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<pre style="margin: 0;">-<span id="LC2548" 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>
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2539
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<pre style="margin: 0;">+<span id="LC2539" 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>
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<pre style="margin: 0;">+<span id="LC2540" 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>
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2541
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<pre style="margin: 0;"> <span id="LC2541" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2542" 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>
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2551
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2543
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<pre style="margin: 0;"> <span id="LC2543" 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>
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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">@@ -2555,14 +2547,43 @@ tcPartialContext hs_theta</td>
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<pre style="margin: 0;"> <span id="LC2547" 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>
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2556
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2548
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<pre style="margin: 0;"> <span id="LC2548" 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>
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2557
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2549
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<pre style="margin: 0;"> <span id="LC2549" 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>
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<pre style="margin: 0;">-<span id="LC2558" 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>
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<pre style="margin: 0;">+<span id="LC2550" 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>
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<pre style="margin: 0;"> <span id="LC2551" 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>
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2552
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<pre style="margin: 0;"> <span id="LC2552" 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>
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<pre style="margin: 0;"> <span id="LC2553" 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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2562
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<pre style="margin: 0;"> <span id="LC2554" 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>
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<pre style="margin: 0;"> <span id="LC2555" 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>
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<pre style="margin: 0;"> <span id="LC2556" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2565" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Extra-constraint holes in partial type signatures]</span></span>
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<pre style="margin: 0;">+<span id="LC2557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Checking partial type signatures]</span></span>
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<pre style="margin: 0;">+<span id="LC2558" 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="LC2559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Recipe for checking a signature]</span></span>
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<pre style="margin: 0;">+<span id="LC2560" class="line" lang="haskell"></span>
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2561
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<pre style="margin: 0;">+<span id="LC2561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we have a parital signature like</span></span>
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2562
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<pre style="margin: 0;">+<span id="LC2562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f,g :: forall a. a -> _</span></span>
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2563
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<pre style="margin: 0;">+<span id="LC2563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we do the following</span></span>
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2564
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<pre style="margin: 0;">+<span id="LC2564" class="line" lang="haskell"></span>
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2565
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<pre style="margin: 0;">+<span id="LC2565" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* In TcSigs.tcUserSigType we return a PartialSig, which (unlike</span></span>
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2566
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<pre style="margin: 0;">+<span id="LC2566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the companion CompleteSig) contains the original, as-yet-unchecked</span></span>
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2567
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<pre style="margin: 0;">+<span id="LC2567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> source-code LHsSigWcType</span></span>
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2568
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<pre style="margin: 0;">+<span id="LC2568" class="line" lang="haskell"></span>
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2569
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<pre style="margin: 0;">+<span id="LC2569" 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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2570
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<pre style="margin: 0;">+<span id="LC2570" 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>
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2571
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<pre style="margin: 0;">+<span id="LC2571" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> LHsSigWcType, creating fresh unification variables for each "_"</span></span>
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2572
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<pre style="margin: 0;">+<span id="LC2572" 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>
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2573
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<pre style="margin: 0;">+<span id="LC2573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> becase they migh get instantiated completely differently. E.g.</span></span>
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2574
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<pre style="margin: 0;">+<span id="LC2574" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f,g :: forall a. a -> _</span></span>
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2575
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<pre style="margin: 0;">+<span id="LC2575" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x = a</span></span>
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2576
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<pre style="margin: 0;">+<span id="LC2576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g x = True</span></span>
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2577
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<pre style="margin: 0;">+<span id="LC2577" 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>
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2578
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<pre style="margin: 0;">+<span id="LC2578" class="line" lang="haskell"></span>
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2579
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<pre style="margin: 0;">+<span id="LC2579" 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>
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2580
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<pre style="margin: 0;">+<span id="LC2580" 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>
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2581
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<pre style="margin: 0;">+<span id="LC2581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wildcards in it. Rather, tcHsPartialSigType just returns the</span></span>
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2582
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<pre style="margin: 0;">+<span id="LC2582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'a' and the 'blah' separately.</span></span>
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2583
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<pre style="margin: 0;">+<span id="LC2583" class="line" lang="haskell"></span>
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2584
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<pre style="margin: 0;">+<span id="LC2584" 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>
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<pre style="margin: 0;">+<span id="LC2585" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2586" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Extra-constraint holes in partial type signatures]</span></span>
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<pre style="margin: 0;"> <span id="LC2587" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2588
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<pre style="margin: 0;"> <span id="LC2588" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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2589
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<pre style="margin: 0;"> <span id="LC2589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: (_) => a -> a</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">@@ -2631,12 +2652,12 @@ tcHsPatSigType ctxt sig_ty</td>
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<pre style="margin: 0;"> <span id="LC2652" 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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2632
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2653
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<pre style="margin: 0;"> <span id="LC2653" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- else casts get in the way of deep skolemisation</span></span>
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2633
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2654
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<pre style="margin: 0;"> <span id="LC2654" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (#16033)</span></span>
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2634
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<pre style="margin: 0;">-<span id="LC2634" 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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2655
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<pre style="margin: 0;">+<span id="LC2655" 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;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">wcs</span> <span class="o" style="font-weight: 600;">-></span></span>
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2635
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2656
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<pre style="margin: 0;"> <span id="LC2656" class="line" lang="haskell"> <span class="n" style="color: #333;">tcExtendNameTyVarEnv</span> <span class="n" style="color: #333;">sig_tkv_prs</span> <span class="o" style="font-weight: 600;">$</span></span>
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2636
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<pre style="margin: 0;"> <span id="LC2657" 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>
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2637
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2658
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<pre style="margin: 0;"> <span id="LC2658" 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>
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2638
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2659
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<pre style="margin: 0;"> <span id="LC2659" class="line" lang="haskell"></span>
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2639
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<pre style="margin: 0;">-<span id="LC2639" 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>
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<pre style="margin: 0;">+<span id="LC2660" 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>
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2661
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<pre style="margin: 0;"> <span id="LC2661" class="line" lang="haskell"></span>
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2662
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<pre style="margin: 0;"> <span id="LC2662" 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>
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2663
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<pre style="margin: 0;"> <span id="LC2663" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- contains a forall). Promote these.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#367db94fc37c8c7548dbe545a5302c7a5108e41e"><strong>compiler/typecheck/TcMType.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">@@ -1433,9 +1433,9 @@ quantifyTyVars gbl_tvs</td>
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<pre style="margin: 0;"> <span id="LC1433" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: All variables in the kind of a covar must not be</span></span>
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<pre style="margin: 0;"> <span id="LC1434" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- quantified over, as we don't quantify over the covar.</span></span>
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<pre style="margin: 0;"> <span id="LC1435" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1436" class="line" lang="haskell"> <span class="n" style="color: #333;">dep_kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">dVarSetElemsWellScoped</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1436" class="line" lang="haskell"> <span class="n" style="color: #333;">dep_kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">scopedSort</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">dVarSetElems</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1437" class="line" lang="haskell"> <span class="n" style="color: #333;">dep_tkvs</span> <span class="p">`</span><span class="n" style="color: #333;">dVarSetMinusVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">mono_tvs</span></span>
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<pre style="margin: 0;">-<span id="LC1438" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">dVarSetElemsWellScoped</span>: put the kind variables into</span></span>
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<pre style="margin: 0;">+<span id="LC1438" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">scopedSort</span>: put the kind variables into</span></span>
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<pre style="margin: 0;"> <span id="LC1439" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- well-scoped order.</span></span>
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<pre style="margin: 0;"> <span id="LC1440" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- E.g. [k, (a::k)] not the other way roud</span></span>
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<pre style="margin: 0;"> <span id="LC1441" 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">@@ -1453,7 +1453,7 @@ quantifyTyVars gbl_tvs</td>
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<pre style="margin: 0;"> <span id="LC1453" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1454" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This block uses level numbers to decide what to quantify</span></span>
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<pre style="margin: 0;"> <span id="LC1455" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and emits a warning if the two methods do not give the same answer</span></span>
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<pre style="margin: 0;">-<span id="LC1456" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">dep_kvs2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">dVarSetElemsWellScoped</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1456" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">dep_kvs2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">scopedSort</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">dVarSetElems</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1457" class="line" lang="haskell"> <span class="n" style="color: #333;">filterDVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">quantifiableTv</span> <span class="n" style="color: #333;">outer_tclvl</span><span class="p">)</span> <span class="n" style="color: #333;">dep_tkvs</span></span>
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<pre style="margin: 0;"> <span id="LC1458" class="line" lang="haskell"> <span class="n" style="color: #333;">nondep_tvs2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="p">(</span><span class="n" style="color: #333;">quantifiableTv</span> <span class="n" style="color: #333;">outer_tclvl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1459" class="line" lang="haskell"> <span class="n" style="color: #333;">dVarSetElems</span> <span class="p">(</span><span class="n" style="color: #333;">nondep_tkvs</span> <span class="p">`</span><span class="n" style="color: #333;">minusDVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">dep_tkvs</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#2799ba786adc98d485fad6003334b913a0069bdc"><strong>compiler/typecheck/TcRnDriver.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2438,8 +2438,8 @@ tcRnType hsc_env flexi normalise rdr_type</td>
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<pre style="margin: 0;"> <span id="LC2438" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- must push level to satisfy level precondition of</span></span>
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<pre style="margin: 0;"> <span id="LC2439" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- kindGeneralize, below</span></span>
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<pre style="margin: 0;"> <span id="LC2440" class="line" lang="haskell"> <span class="n" style="color: #333;">solveEqualities</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC2441" 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;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">wcs'</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC2442" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">emitWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs'</span></span>
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<pre style="margin: 0;">+<span id="LC2441" class="line" lang="haskell"> <span class="n" style="color: #333;">tc<span class="idiff left right">Named</span>WildCardBinders</span> <span class="n" style="color: #333;">wcs</span> <span class="o" style="font-weight: 600;">$</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>
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<pre style="margin: 0;">+<span id="LC2442" 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>
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<pre style="margin: 0;"> <span id="LC2443" 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>
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<pre style="margin: 0;"> <span id="LC2444" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2445" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do kind generalisation; see Note [Kind-generalise in tcRnType]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#fa5bd207fd28db668d069147fd989ad2ac810fd7"><strong>compiler/typecheck/TcRnMonad.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">@@ -103,7 +103,8 @@ module TcRnMonad(</td>
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<pre style="margin: 0;"> <span id="LC103" 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>
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<pre style="margin: 0;"> <span id="LC104" 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>
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<pre style="margin: 0;"> <span id="LC105" 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>
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<pre style="margin: 0;">-<span id="LC106" 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>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"> <span class="n" style="color: #333;">traceTcConstraints</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC107" 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>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Template Haskell context</span></span>
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<pre style="margin: 0;"> <span id="LC110" 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">@@ -1676,8 +1677,16 @@ traceTcConstraints msg</td>
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<pre style="margin: 0;"> <span id="LC1677" 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="LC1678" class="line" lang="haskell"> <span class="p">}</span></span>
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1679
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<pre style="margin: 0;"> <span id="LC1679" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1679" 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>
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<pre style="margin: 0;">-<span id="LC1680" 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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<pre style="margin: 0;">+<span id="LC1680" 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>
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<pre style="margin: 0;">+<span id="LC1681" class="line" lang="haskell"><span class="n" style="color: #333;">emitAnonWildCardHoleConstraint</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">+<span id="LC1682" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="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="LC1683" 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>
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1684
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<pre style="margin: 0;">+<span id="LC1684" 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>
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<pre style="margin: 0;">+<span id="LC1685" 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>
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<pre style="margin: 0;">+<span id="LC1686" 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>
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<pre style="margin: 0;">+<span id="LC1687" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1688" 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>
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<pre style="margin: 0;">+<span id="LC1689" class="line" lang="haskell"><span class="n" style="color: #333;">emitNamedWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs</span></span>
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1690
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<pre style="margin: 0;"> <span id="LC1690" 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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1691
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<pre style="margin: 0;"> <span id="LC1691" 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>
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1692
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<pre style="margin: 0;"> <span id="LC1692" 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>
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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">@@ -1690,7 +1699,7 @@ emitWildCardHoleConstraints wcs</td>
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<pre style="margin: 0;"> <span id="LC1699" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1691
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<pre style="margin: 0;"> <span id="LC1700" 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>
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1701
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<pre style="margin: 0;"> <span id="LC1701" 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>
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<pre style="margin: 0;">-<span id="LC1693" 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>
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<pre style="margin: 0;">+<span id="LC1702" 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>
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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;">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>
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1695
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1704
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<pre style="margin: 0;"> <span id="LC1704" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Wildcards are defined locally, and so have RealSrcSpans</span></span>
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1705
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<pre style="margin: 0;"> <span id="LC1705" 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>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813"><strong>compiler/typecheck/TcRnTypes.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">@@ -1542,6 +1542,10 @@ data TcIdSigInst</td>
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1542
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1542
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<pre style="margin: 0;"> <span id="LC1542" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No need to keep track of whether they are truly lexically</span></span>
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1543
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1543
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<pre style="margin: 0;"> <span id="LC1543" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- scoped because the renamer has named them uniquely</span></span>
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1544
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1544
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<pre style="margin: 0;"> <span id="LC1544" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Binding scoped type variables] in TcSigs</span></span>
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1545
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<pre style="margin: 0;">+<span id="LC1545" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1546
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<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: The order of sig_inst_skols is irrelevant</span></span>
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1547
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for a CompleteSig, but for a PartialSig see</span></span>
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1548
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<pre style="margin: 0;">+<span id="LC1548" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Quantified varaibles in partial type signatures]</span></span>
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1549
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<pre style="margin: 0;"> <span id="LC1549" class="line" lang="haskell"></span>
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1550
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<pre style="margin: 0;"> <span id="LC1550" 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="kt" style="color: #458; font-weight: 600;">TcThetaType</span></span>
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1547
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1551
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<pre style="margin: 0;"> <span id="LC1551" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Instantiated theta. In the case of a</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">@@ -1553,15 +1557,15 @@ data TcIdSigInst</td>
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1553
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1557
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<pre style="margin: 0;"> <span id="LC1557" class="line" lang="haskell"></span>
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1554
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1558
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<pre style="margin: 0;"> <span id="LC1558" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Relevant for partial signature only</span></span>
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1555
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1559
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<pre style="margin: 0;"> <span id="LC1559" 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="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>
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1556
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<pre style="margin: 0;">-<span id="LC1556" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Like sig_inst_skols, but for <span class="idiff left right">wildcards. The named</span></span></span>
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1557
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<pre style="margin: 0;">-<span id="LC1557" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">wildcards scope over the binding, and hence their</span></span></span>
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1558
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<pre style="margin: 0;">-<span id="LC1558" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Names may appear in type signatures in the binding</span></span>
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1560
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<pre style="margin: 0;">+<span id="LC1560" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Like sig_inst_skols, but for <span class="idiff left right">/named/ wildcards (_a etc).</span></span></span>
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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;">-- <span class="idiff left right">The named wildcards scope over the binding, and hence</span></span></span>
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<pre style="margin: 0;">+<span id="LC1562" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">their </span>Names may appear in type signatures in the binding</span></span>
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1559
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1563
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<pre style="margin: 0;"> <span id="LC1563" class="line" lang="haskell"></span>
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1560
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<pre style="margin: 0;"> <span id="LC1564" 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="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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1561
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1565
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<pre style="margin: 0;"> <span id="LC1565" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Extra-constraints wildcard to fill in, if any</span></span>
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1562
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1566
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<pre style="margin: 0;"> <span id="LC1566" 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>
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1563
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1567
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<pre style="margin: 0;"> <span id="LC1567" 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>
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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.tcWildCardOcc</span></span>
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1568
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<pre style="margin: 0;">+<span id="LC1568" 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>
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1565
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<pre style="margin: 0;"> <span id="LC1569" class="line" lang="haskell"> <span class="p">}</span></span>
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1566
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1570
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<pre style="margin: 0;"> <span id="LC1570" class="line" lang="haskell"></span>
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1571
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<pre style="margin: 0;"> <span id="LC1571" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1572,6 +1576,26 @@ if the original function had a signature like</td>
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1576
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<pre style="margin: 0;"> <span id="LC1576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But that's ok: tcMatchesFun (called by tcRhs) can deal with that</span></span>
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<pre style="margin: 0;"> <span id="LC1577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It happens, too! See Note [Polymorphic methods] in TcClassDcl.</span></span>
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<pre style="margin: 0;"> <span id="LC1578" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Quantified varaibles in partial type signatures]</span></span>
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1580
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<pre style="margin: 0;">+<span id="LC1580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1581
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<pre style="margin: 0;">+<span id="LC1581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;">+<span id="LC1582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall a b. _ -> a -> _ -> b</span></span>
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<pre style="margin: 0;">+<span id="LC1583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (x,y) p q = q</span></span>
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1584
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<pre style="margin: 0;">+<span id="LC1584" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then we expect f's final type to be</span></span>
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<pre style="margin: 0;">+<span id="LC1586" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall {x,y}. forall a b. (x,y) -> a -> b -> b</span></span>
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<pre style="margin: 0;">+<span id="LC1587" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1588" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that x,y are Inferred, and can't be use for visible type</span></span>
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<pre style="margin: 0;">+<span id="LC1589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">application (VTA). But a,b are Specified, and remain Specified</span></span>
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1590
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<pre style="margin: 0;">+<span id="LC1590" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the final type, so we can use VTA for them. (Exception: if</span></span>
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1591
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<pre style="margin: 0;">+<span id="LC1591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it turns out that a's kind mentions b we need to reorder them</span></span>
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1592
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<pre style="margin: 0;">+<span id="LC1592" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with scopedSort.)</span></span>
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1593
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<pre style="margin: 0;">+<span id="LC1593" class="line" lang="haskell"></span>
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1594
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<pre style="margin: 0;">+<span id="LC1594" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The sig_inst_skols of the TISI from a partial signature records</span></span>
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1595
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<pre style="margin: 0;">+<span id="LC1595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that original order, and is used to get the variables of f's</span></span>
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1596
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<pre style="margin: 0;">+<span id="LC1596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">final type in the correct order.</span></span>
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1597
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<pre style="margin: 0;">+<span id="LC1597" class="line" lang="haskell"></span>
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1598
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<pre style="margin: 0;">+<span id="LC1598" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Wildcards in partial signatures]</span></span>
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1600
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<pre style="margin: 0;"> <span id="LC1600" 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="LC1601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The wildcards in psig_wcs may stand for a type mentioning</span></span>
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<li id="341aef35ac370771edf59ec6b9fbb31507fa6f18">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#341aef35ac370771edf59ec6b9fbb31507fa6f18"><strong>compiler/typecheck/TcSigs.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">@@ -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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<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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<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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<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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<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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<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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<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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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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<pre style="margin: 0;"> <span id="LC511" 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">@@ -1795,11 +1795,14 @@ hasTyVarHead ty -- Haskell 98 allows predicates of form</td>
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<pre style="margin: 0;"> <span id="LC1795" 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>
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<pre style="margin: 0;"> <span id="LC1796" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1797" 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>
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<pre style="margin: 0;">-<span id="LC1798" class="line" lang="haskell"><span class="n" style="color: #333;">evVarPred</span> <span class="n" style="color: #333;">var</span></span>
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<pre style="margin: 0;">-<span id="LC1799" 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>
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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>
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<pre style="margin: 0;">-<span id="LC1801" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1802" 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>
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<pre style="margin: 0;">+<span id="LC1798" 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>
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<pre style="margin: 0;">+<span id="LC1799" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Historical note: I used to have an ASSERT here,</span></span>
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<pre style="margin: 0;">+<span id="LC1800" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- checking (isEvVarType (varType var)). But with something like</span></span>
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<pre style="margin: 0;">+<span id="LC1801" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- f :: c => _ -> _</span></span>
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<pre style="margin: 0;">+<span id="LC1802" 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>
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<pre style="margin: 0;">+<span id="LC1803" 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>
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<pre style="margin: 0;">+<span id="LC1804" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- partial signatures, (isEvVarType kappa) will return False. But</span></span>
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<pre style="margin: 0;">+<span id="LC1805" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- nothing is wrong. So I just removed the ASSERT.</span></span>
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<pre style="margin: 0;"> <span id="LC1806" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1807" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------</span></span>
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<pre style="margin: 0;"> <span id="LC1808" class="line" lang="haskell"><span class="cd">-- | When inferring types, should we quantify over a given predicate?</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#07ce9a046fb8ea6659690020b0a8551d94cfdf1c"><strong>compiler/types/Type.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">@@ -158,8 +158,8 @@ module Type (</td>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">typeSize</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">occCheckExpand</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="haskell"></span>
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160
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Well-scoped lists of variables</span></span>
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">dVarSetElemsWellScoped</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">scopedSort</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfTypeWellScoped</span><span class="p">,</span></span>
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162
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<pre style="margin: 0;">-<span id="LC162" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfTypesWellScoped</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">tyCoVarsOfBindersWellScoped</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">scopedSort</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfTypeWellScoped</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfTypesWellScoped</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Type comparison</span></span>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">eqType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">eqTypeX</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">eqTypes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nonDetCmpType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nonDetCmpTypes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nonDetCmpTypeX</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">@@ -250,7 +250,7 @@ import UniqSet</td>
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<pre style="margin: 0;"> <span id="LC250" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Class</span></span>
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<pre style="margin: 0;"> <span id="LC251" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC252" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TysPrim</span></span>
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<pre style="margin: 0;">-<span id="LC253" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">TysWiredIn</span> <span class="p">(</span> <span class="n" style="color: #333;">listTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">typeNatKind</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">unitTy</span></span></span>
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">TysWiredIn</span> <span class="p">(</span> <span class="n" style="color: #333;">listTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">typeNatKind</span></span>
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254
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<pre style="margin: 0;"> <span id="LC254" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">typeSymbolKind</span><span class="p">,</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">constraintKind</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PrelNames</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">@@ -2199,15 +2199,6 @@ scopedSort = go [] []</td>
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<pre style="margin: 0;"> <span id="LC2199" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- lists not in correspondence</span></span>
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<pre style="margin: 0;"> <span id="LC2200" class="line" lang="haskell"> <span class="n" style="color: #333;">insert</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"scopedSort"</span></span>
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2201
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2201
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<pre style="margin: 0;"> <span id="LC2201" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2202" class="line" lang="haskell"><span class="cd">-- | Extract a well-scoped list of variables from a deterministic set of</span></span>
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<pre style="margin: 0;">-<span id="LC2203" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variables. The result is deterministic.</span></span>
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<pre style="margin: 0;">-<span id="LC2204" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: There used to exist varSetElemsWellScoped :: VarSet -> [Var] which</span></span>
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<pre style="margin: 0;">-<span id="LC2205" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- took a non-deterministic set and produced a non-deterministic</span></span>
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<pre style="margin: 0;">-<span id="LC2206" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- well-scoped list. If you care about the list being well-scoped you also</span></span>
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<pre style="margin: 0;">-<span id="LC2207" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- most likely care about it being in deterministic order.</span></span>
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<pre style="margin: 0;">-<span id="LC2208" class="line" lang="haskell"><span class="n" style="color: #333;">dVarSetElemsWellScoped</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DVarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC2209" class="line" lang="haskell"><span class="n" style="color: #333;">dVarSetElemsWellScoped</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">scopedSort</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">dVarSetElems</span></span>
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<pre style="margin: 0;">-<span id="LC2210" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2202" class="line" lang="haskell"><span class="cd">-- | Get the free vars of a type in scoped order</span></span>
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<pre style="margin: 0;"> <span id="LC2203" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfTypeWellScoped</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2204" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfTypeWellScoped</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">scopedSort</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">tyCoVarsOfTypeList</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">@@ -2216,12 +2207,6 @@ tyCoVarsOfTypeWellScoped = scopedSort . tyCoVarsOfTypeList</td>
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<pre style="margin: 0;"> <span id="LC2207" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfTypesWellScoped</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2208" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfTypesWellScoped</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">scopedSort</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">tyCoVarsOfTypesList</span></span>
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<pre style="margin: 0;"> <span id="LC2209" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2219" class="line" lang="haskell"><span class="cd">-- | Given the suffix of a telescope, returns the prefix.</span></span>
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<pre style="margin: 0;">-<span id="LC2220" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Ex: given [(k :: j), (a :: Proxy k)], returns [(j :: *)].</span></span>
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<pre style="margin: 0;">-<span id="LC2221" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfBindersWellScoped</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC2222" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfBindersWellScoped</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;">-<span id="LC2223" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfTypeWellScoped</span> <span class="p">(</span><span class="n" style="color: #333;">mkInvForAllTys</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">unitTy</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2224" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2210" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------- Closing over kinds -----------------</span></span>
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<pre style="margin: 0;"> <span id="LC2211" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2212" class="line" lang="haskell"><span class="cd">-- | Add the kind variables free in the kinds of the tyvars in the given set.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#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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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#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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<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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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> • In the kind ‘_’</span>
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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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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#65238b2bc6d63b92c18503e1d45d68c4641cda65"><strong>testsuite/tests/partial-sigs/should_compile/T16728a.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ExplicitForAll, PartialTypeSignatures #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="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>
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<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>
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<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>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#8998d74383852482788d62775428d5c578125347"><strong>testsuite/tests/partial-sigs/should_compile/T16728a.stderr</strong></a>
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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>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘_’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Where: ‘_’ 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 types of</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> g :: a -> _</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> h :: a -> _</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> at T16728a.hs:(5,1)-(7,9)</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> • In the type ‘a -> _’</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> In the type signature: g :: forall a. a -> _</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"></span>
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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>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘_’</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> Where: ‘_’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> the inferred types of</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> g :: a -> _</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> h :: a -> _</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> at T16728a.hs:(5,1)-(7,9)</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> • In the type ‘a -> _’</span>
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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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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#d6d32f1b07f8052f82e7678e4a15e0cf57b827c1"><strong>testsuite/tests/partial-sigs/should_compile/T16728b.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ExplicitForAll, PartialTypeSignatures #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="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>
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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="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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<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;">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>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#befe36efee69935add9af6dc4b7a849aa1be3241"><strong>testsuite/tests/partial-sigs/should_compile/T16728b.stderr</strong></a>
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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>
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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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<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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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#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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<a href="https://gitlab.haskell.org/ghc/ghc/compare/39c758e1426c9e5b00de2207ad53bb4377c1e6a6...3ae23992786c7ea3211ab6f13e1d61a5edfe5952#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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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T14040a.hs:34:8: error:</span>
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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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<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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