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<h3>

Simon Peyton Jones pushed to branch wip/T17775

at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>

</h3>

<h4>

Commits:

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<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04e23aea46b26442dca59f4bcf57d5d91a775da0">04e23aea</a></strong>

<div>

<span>by Simon Peyton Jones</span>

<i>at 2020-04-24T14:02:02+01:00</i>

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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wibbles in response to Richard and Ryan reviews

</pre>

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<h4>8 changed files:</h4>

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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">

compiler/GHC/Core/Coercion.hs

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<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">

compiler/GHC/Core/Type.hs

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<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">

compiler/GHC/Tc/Errors.hs

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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">

compiler/GHC/Tc/Gen/HsType.hs

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<a href="#3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9">

compiler/GHC/Tc/Gen/Match.hs

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<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">

compiler/GHC/Tc/Utils/Unify.hs

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<a href="#a7e2c335af4a53c47c2eeedda7ddc3a839a4a1be">

testsuite/tests/partial-sigs/should_compile/TypeFamilyInstanceLHS.stderr

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<a href="#5bab311b35c799ac81803fd69323e3bf25d7bf00">

testsuite/tests/polykinds/T9569.hs

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<h4>Changes:</h4>

<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04e23aea46b26442dca59f4bcf57d5d91a775da0#783e5dae6e86931f06700fc088fb7d48c8a07386"><strong>compiler/GHC/Core/Coercion.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="262" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -262,6 +262,7 @@ tidyCoAxBndrsForUser :: TidyEnv -> [Var] -> (TidyEnv, [Var])</td>

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262

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<pre style="margin: 0;"> <span id="LC262" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--     forall a _1 _2. F _1 [a] _2 = ...</span></span>

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<pre style="margin: 0;"> <span id="LC263" 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="LC264" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is a rather disgusting function</span></span>

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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Wildcard names] in GHC.Tc.Gen.HsType</span></span>

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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"><span class="n" style="color: #333;">tidyCoAxBndrsForUser</span> <span class="n" style="color: #333;">init_env</span> <span class="n" style="color: #333;">tcvs</span></span>

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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">tidy_env</span><span class="p">,</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">tidy_bndrs</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

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<li id="84c9d3ba34173297e7d7747e02caa2e004b164fc">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04e23aea46b26442dca59f4bcf57d5d91a775da0#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1873" 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="1873" 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">@@ -1873,12 +1873,17 @@ isTauTy (CoercionTy _)        = False  -- Not sure about this</td>

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<pre style="margin: 0;"> <span id="LC1873" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC1874" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicTy</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="kt" style="color: #458; font-weight: 600;">Bool</span></span>

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<pre style="margin: 0;"> <span id="LC1875" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True if the type is just a single token, and can be printed compactly</span></span>

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<pre style="margin: 0;">-<span id="LC1876" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">isAtomicTy</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">TyVarTy</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{})</span></span><span class="idiff">             </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Tru</span>e</span></span>

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1877

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<pre style="margin: 0;">-<span id="LC1877" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left">isAtomicTy</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">LitTy</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{})</span></span><span class="idiff">               </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">True</span></span></span>

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<pre style="margin: 0;">-<span id="LC1878" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ty<span class="idiff left">ConApp</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">[]</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right">      </span>    <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

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1879

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<td class="diff-line-num new_line old" data-linenumber="1876" 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="LC1879" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicTy</span> <span class="n" style="color: #333;"><span class="idiff left">ty</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">isLiftedTypeKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">True</span></span><span class="idiff">  </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Type prints compactly as *</span></span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1880" 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">

1880

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<td class="diff-line-num new_line old" data-linenumber="1876" 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="LC1880" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicTy</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff">                        </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Fals</span>e</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1881" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1876" 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">

1876

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1876" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- Used when deciding how to lay out type error messages; see th</span>e</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1881" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1877" 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">

1877

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<pre style="margin: 0;">+<span id="LC1877" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- call in GHC.Tc.Errors</span></span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1881" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1878" 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">

1878

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<pre style="margin: 0;">+<span id="LC1878" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ty<span class="idiff left">VarTy</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">{})</span></span>    <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1881" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1879" 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">

1879

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<pre style="margin: 0;">+<span id="LC1879" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicTy</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LitTy</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{})</span></span><span class="idiff">      </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">True</span></span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1881" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1880" 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">

1880

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<pre style="margin: 0;">+<span id="LC1880" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicTy</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyConApp</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">[]</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Tru</span>e</span></span>

</pre>

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1881

</td>

<td class="diff-line-num new_line" data-linenumber="1881" 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">

1881

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<pre style="margin: 0;"> <span id="LC1881" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1882" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1882" 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">

1882

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<pre style="margin: 0;">+<span id="LC1882" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicTy</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isLiftedTypeKind</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1882" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1883" 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">

1883

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<pre style="margin: 0;">+<span id="LC1883" class="line" lang="haskell">   <span class="c1" style="color: #998; font-style: italic;">-- 'Type' prints compactly as *</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1882" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1884" 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">

1884

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<pre style="margin: 0;">+<span id="LC1884" class="line" lang="haskell">   <span class="c1" style="color: #998; font-style: italic;">-- See GHC.Iface.Type.ppr_kind_type</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1882" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1885" 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">

1885

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1885" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

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<td class="diff-line-num new old_line" data-linenumber="1882" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1886" 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">

1886

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<pre style="margin: 0;">+<span id="LC1886" class="line" lang="haskell"><span class="n" style="color: #333;">isAtomicTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1882" 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">

1882

</td>

<td class="diff-line-num new_line" data-linenumber="1887" 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">

1887

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1887" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1883" 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">

1883

</td>

<td class="diff-line-num new_line" data-linenumber="1888" 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">

1888

</td>

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<pre style="margin: 0;"> <span id="LC1888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1884" 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">

1884

</td>

<td class="diff-line-num new_line" data-linenumber="1889" 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">

1889

</td>

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<pre style="margin: 0;"> <span id="LC1889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>

</pre>

</td>

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<br>

</li>

<li id="e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04e23aea46b26442dca59f4bcf57d5d91a775da0#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76"><strong>compiler/GHC/Tc/Errors.hs</strong></a>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="425" 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">@@ -425,7 +425,7 @@ reportImplic ctxt implic@(Implic { ic_skols = tvs</td>

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<pre style="margin: 0;"> <span id="LC425" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">reportWanteds</span> <span class="n" style="color: #333;">ctxt'</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">wanted</span></span>

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<pre style="margin: 0;"> <span id="LC426" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">cec_warn_redundant</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>

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427

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427

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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell">         <span class="n" style="color: #333;">warnRedundantConstraints</span> <span class="n" style="color: #333;">ctxt'</span> <span class="n" style="color: #333;">tcl_env</span> <span class="n" style="color: #333;">info'</span> <span class="n" style="color: #333;">dead_givens</span></span>

</pre>

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428

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<pre style="margin: 0;">-<span id="LC428" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">bad_telescope</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">reportBadTelescope</span> <span class="n" style="color: #333;">ctxt</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">tcl_env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">info</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tvs</span></span> <span class="p">}</span></span>

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428

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<pre style="margin: 0;">+<span id="LC428" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">bad_telescope</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">reportBadTelescope</span> <span class="n" style="color: #333;">ctxt<span class="idiff left">'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tcl_env</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">info'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tvs'</span></span> <span class="p">}</span></span>

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429

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429

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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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430

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<pre style="margin: 0;"> <span id="LC430" class="line" lang="haskell">    <span class="n" style="color: #333;">tcl_env</span>      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ic_env</span> <span class="n" style="color: #333;">implic</span></span>

</pre>

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431

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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell">    <span class="n" style="color: #333;">insoluble</span>    <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isInsolubleStatus</span> <span class="n" style="color: #333;">status</span></span>

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<br>

</li>

<li id="9355bef855426caf5f526925edf351b20f9a86c4">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04e23aea46b26442dca59f4bcf57d5d91a775da0#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="336" 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">@@ -336,7 +336,7 @@ tcHsSigType ctxt sig_ty</td>

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<pre style="margin: 0;"> <span id="LC336" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">implic</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">sig_ty</span>  <span class="p">(</span><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC337" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="338" 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="LC338" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Spit out the implication (and perhpas fail fast)</span></span>

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<td class="diff-line-num new_line old" data-linenumber="339" 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="LC339" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Kind-checking</span> type signatures] in GHC.Tc.Solver</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="340" 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="339" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Failure in local</span> type signatures] in GHC.Tc.Solver</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="340" 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">

340

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<td class="diff-line-num new_line" data-linenumber="340" 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">

340

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<pre style="margin: 0;"> <span id="LC340" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">emitFlatConstraints</span> <span class="p">(</span><span class="n" style="color: #333;">mkImplicWC</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">implic</span><span class="p">))</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="341" 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">

341

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<td class="diff-line-num new_line" data-linenumber="341" 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">

341

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<pre style="margin: 0;"> <span id="LC341" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="342" 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">

342

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<pre style="margin: 0;"> <span id="LC342" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

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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">@@ -378,6 +378,7 @@ tc_hs_sig_type skol_info hs_sig_type ctxt_kind</td>

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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">kvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">kindGeneralizeSome</span> <span class="n" style="color: #333;">should_gen</span> <span class="n" style="color: #333;">ty1</span></span>

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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Build an implication for any as-yet-unsolved kind equalities</span></span>

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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolem escape in type signatures]</span></span>

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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">implic</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">buildTvImplication</span> <span class="n" style="color: #333;">skol_info</span> <span class="p">(</span><span class="n" style="color: #333;">kvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">spec_tkvs</span><span class="p">)</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">wanted</span></span>

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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC384" 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;">implic</span><span class="p">,</span> <span class="n" style="color: #333;">mkInvForAllTys</span> <span class="n" style="color: #333;">kvs</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span> <span class="p">}</span></span>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="389" 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">@@ -388,21 +389,28 @@ tcHsSigType is tricky.  Consider (T11142)</td>

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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  foo :: forall b. (forall k (a :: k). SameKind a b) -> ()</span></span>

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<pre style="margin: 0;"> <span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is ill-kinded becuase of a nested skolem-escape.</span></span>

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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That will show up as an un-solvable constraint in the implicaiton</span></span>

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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">returned by buildTvImplication in tc_hs_sig_type.</span></span>

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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That will show up as an un-solvable constraint in the implication</span></span>

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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">returned by buildTvImplication in tc_hs_sig_type.  See Note [Skolem</span></span>

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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">escape prevention] in GHC.Tc.Utils.TcType for why it is unsolvable</span></span>

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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(the unification variable for b's kind is untouchable).</span></span>

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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then, in GHC.Tc.Solver.emitFlatConstraints (called from tcHsSigType)</span></span>

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395

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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we'll try to float out the constraint, be unable to do so, and fail.</span></span>

</pre>

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396

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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See GHC.Tc.Solver Note [Failure in local type signatures].</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See GHC.Tc.Solver Note [Failure in local type signatures] for more</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">detail on this.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The separation between tcHsSigType and tc_hs_sig_type is because</span></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;">tcClassSigType wants to use the latter, but *not* fail fast, because</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">there are skolems from the class decl which are in scope; but its fine</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">there are skolems from the class decl which are in scope; but it<span class="idiff left right">'</span>s fine</span></span>

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401

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<pre style="margin: 0;"> <span id="LC405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not to because tcClassDecl1 has a solveEqualities wrapped around all</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the tcClassSigType calls.</span></span>

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<pre style="margin: 0;"> <span id="LC407" class="line" lang="haskell"></span>

</pre>

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404

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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That's why tcHsSigType does emitFlatConstraints (which fails fast) but</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="409" 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="LC409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tcClassSigType just does emitImplication (which does not).  Ugh.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">c.f. see also Note [Skolem escape and forall-types]. The difference</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="412" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is that we don't need ot simplify at a forall type, only at the</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="413" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">top level of a signature.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does validity checking and zonking.</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="411" 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="419" 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">@@ -411,7 +419,7 @@ tcStandaloneKindSig (L _ kisig) = case kisig of</td>

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<pre style="margin: 0;"> <span id="LC419" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="n" style="color: #333;">ksig</span> <span class="o" style="font-weight: 600;">-></span></span>

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<td class="diff-line-num old_line" data-linenumber="412" 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="LC420" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSigCtxt</span> <span class="n" style="color: #333;">name</span> <span class="kr" style="font-weight: 600;">in</span></span>

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<td class="diff-line-num old_line" data-linenumber="413" 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="LC421" class="line" lang="haskell">    <span class="n" style="color: #333;">addSigCtxt</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="n" style="color: #333;">hsSigType</span> <span class="n" style="color: #333;">ksig</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>

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<td class="diff-line-num old old_line" data-linenumber="414" 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="LC414" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC422" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left right">TcTy</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span></span>

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<pre style="margin: 0;"> <span id="LC423" class="line" lang="haskell">       <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;">tc_top_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ksig</span> <span class="p">(</span><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC424" 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="n" style="color: #333;">kind</span></span>

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<td class="diff-line-num new_line" data-linenumber="425" 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="LC425" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span> <span class="p">}</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="419" 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="427" 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">@@ -419,7 +427,7 @@ tcStandaloneKindSig (L _ kisig) = case kisig of</td>

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<td class="diff-line-num new_line" data-linenumber="427" 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="LC427" class="line" lang="haskell"></span>

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<td class="diff-line-num new_line" data-linenumber="428" 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="LC428" class="line" lang="haskell"><span class="n" style="color: #333;">tcTopLHsType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ContextKind</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;">Type</span></span>

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<td class="diff-line-num new_line" data-linenumber="429" 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="LC429" class="line" lang="haskell"><span class="n" style="color: #333;">tcTopLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">ctxt_kind</span></span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="430" 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="LC422" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="430" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC430" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left right">TcTy</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">tc_top_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">ctxt_kind</span> <span class="p">}</span></span>

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<td class="diff-line-num new_line" data-linenumber="432" 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="LC432" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"><span class="n" style="color: #333;">tc_top_lhs_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;">LHsSigType</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;">ContextKind</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;">Type</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">@@ -514,15 +522,14 @@ tcHsTypeApp :: LHsWcType GhcRn -> Kind -> TcM Type</td>

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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Recipe for checking a signature] in GHC.Tc.Gen.HsType</span></span>

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<pre style="margin: 0;"> <span id="LC523" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsTypeApp</span> <span class="n" style="color: #333;">wc_ty</span> <span class="n" style="color: #333;">kind</span></span>

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<pre style="margin: 0;"> <span id="LC524" 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;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wc_ty</span></span>

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<pre style="margin: 0;">-<span id="LC517" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

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<pre style="margin: 0;">-<span id="LC518" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">mode'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span> <span class="p">}</span></span>

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<pre style="margin: 0;">-<span id="LC519" class="line" lang="haskell">                     <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wildcards in visible type application]</span></span>

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<pre style="margin: 0;">+<span id="LC525" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span></span>

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<pre style="margin: 0;">+<span id="LC526" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- HM_VTA: See Note [Wildcards in visible type application]</span></span>

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<pre style="margin: 0;"> <span id="LC527" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addTypeCtxt</span> <span class="n" style="color: #333;">hs_ty</span>                  <span class="o" style="font-weight: 600;">$</span></span>

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<pre style="margin: 0;"> <span id="LC528" class="line" lang="haskell">               <span class="n" style="color: #333;">solveLocalEqualities</span> <span class="s" style="color: #d14;">"tcHsTypeApp"</span> <span class="o" style="font-weight: 600;">$</span></span>

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<pre style="margin: 0;"> <span id="LC529" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- We are looking at a user-written type, very like a</span></span>

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<pre style="margin: 0;"> <span id="LC530" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- signature so we want to solve its equalities right now</span></span>

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<pre style="margin: 0;"> <span id="LC531" 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="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="LC525" class="line" lang="haskell">               <span class="n" style="color: #333;">tc_lhs_type</span> <span class="n" style="color: #333;">mode<span class="idiff left right">'</span></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="LC532" class="line" lang="haskell">               <span class="n" style="color: #333;">tc_lhs_type</span> <span class="n" style="color: #333;">mode</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="LC533" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="527" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="534" 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="LC534" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- We do not kind-generalize type applications: we just</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="535" 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="LC535" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- instantiate with exactly what the user says.</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="577" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="584" 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">@@ -577,13 +584,11 @@ tcFamTyPats fam_tc hs_pats</td>

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<td class="diff-line-num old_line" data-linenumber="577" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC584" 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;">traceTc</span> <span class="s" style="color: #d14;">"tcFamTyPats {"</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="578" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell">         <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"arity:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_arity</span> <span class="p">]</span></span>

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<pre style="margin: 0;"> <span id="LC586" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="581" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="587" 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="LC581" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="582" 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="587" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="582" 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="588" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC588" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- HM_FamPat: See Note [Wildcards in family instances] in</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="582" 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="589" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC589" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- GHC.Rename.Module</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="590" 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="LC590" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fun_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="591" 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="LC583" class="line" lang="haskell">             <span class="n" style="color: #333;">mode'</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</span> <span class="p">}</span></span>

</pre>

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584

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<td class="diff-line-num new_line old" data-linenumber="591" 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="LC584" class="line" lang="haskell">                      <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wildcards in family instances] in</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="585" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="591" 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="LC585" class="line" lang="haskell">                      <span class="c1" style="color: #998; font-style: italic;">-- GHC.Rename.Module</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="586" 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">

586

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<pre style="margin: 0;">-<span id="LC586" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">fam_app</span><span class="p">,</span> <span class="n" style="color: #333;">res_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferTyApps</span> <span class="n" style="color: #333;">mode'</span> <span class="n" style="color: #333;">lhs_fun</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">hs_pats</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC591" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">fam_app</span><span class="p">,</span> <span class="n" style="color: #333;">res_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferTyApps</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">lhs_fun</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">hs_pats</span></span>

</pre>

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592

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<pre style="margin: 0;"> <span id="LC592" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="588" 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">

588

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<td class="diff-line-num new_line" data-linenumber="593" 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">

593

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<pre style="margin: 0;"> <span id="LC593" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"End tcFamTyPats }"</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="589" 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">

589

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<td class="diff-line-num new_line" data-linenumber="594" 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">

594

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<pre style="margin: 0;"> <span id="LC594" class="line" lang="haskell">         <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"res_kind:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res_kind</span> <span class="p">]</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="624" 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="629" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -624,7 +629,7 @@ tcCheckLHsType hs_ty exp_kind</td>

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<td class="diff-line-num old_line" data-linenumber="624" 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">

624

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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsType</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;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcKind</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="625" 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">

625

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<td class="diff-line-num new_line" data-linenumber="630" 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="LC630" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Called from outside: set the context</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="626" 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">

626

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<td class="diff-line-num new_line" data-linenumber="631" 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">

631

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<pre style="margin: 0;"> <span id="LC631" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addTypeCtxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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627

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<td class="diff-line-num new_line old" data-linenumber="632" 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="LC627" class="line" lang="haskell">                       <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="628" 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="632" 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">

632

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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell">                       <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left right">TcTy</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="628" 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">

628

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<td class="diff-line-num new_line" data-linenumber="633" 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">

633

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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell">                          <span class="p">;</span> <span class="n" style="color: #333;">tc_infer_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span></span>

</pre>

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629

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<td class="diff-line-num new_line" data-linenumber="634" 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">

634

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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="630" 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">

630

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<td class="diff-line-num new_line" data-linenumber="635" 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="LC635" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Like tcInferLHsType, but use it in a context where type synonyms and type families</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="633" 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="638" 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">@@ -633,7 +638,7 @@ tcInferLHsTypeUnsaturated :: LHsType GhcRn -> TcM (TcType, TcKind)</td>

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633

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<td class="diff-line-num new_line" data-linenumber="638" 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="LC638" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferLHsTypeUnsaturated</span> <span class="n" style="color: #333;">hs_ty</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="639" 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">

639

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<pre style="margin: 0;"> <span id="LC639" 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_fun_ty</span><span class="p">,</span> <span class="n" style="color: #333;">hs_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitHsAppTys</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="640" 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">

640

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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addTypeCtxt</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="641" 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="LC636" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

</pre>

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641

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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left right">TcTy</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

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<pre style="margin: 0;"> <span id="LC642" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">fun_ty</span><span class="p">,</span> <span class="n" style="color: #333;">_ki</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_fun_ty</span></span>

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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">tcInferTyApps_nosat</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_fun_ty</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">hs_args</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- Notice the 'nosat'; do not instantiate trailing</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">@@ -687,30 +692,49 @@ concern things that the renamer can't handle.</td>

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<pre style="margin: 0;"> <span id="LC692" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;"> <span id="LC693" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This data type is purely local, not exported from this module</span></span>

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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span></span>

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<pre style="margin: 0;">-<span id="LC690" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span><span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span></span>

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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span><span class="idiff left right"> </span><span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span></span>

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<pre style="margin: 0;"> <span id="LC696" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- See Note [Level<span class="idiff left right"> for anonymous</span> wildcards]</span></span>

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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- See Note [Level<span class="idiff left right">s for</span> wildcards]</span></span>

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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell">             <span class="p">,</span> <span class="n" style="color: #333;">mode_lvl</span>   <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span></span>

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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell">             <span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HoleMode</span></span>

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<pre style="margin: 0;">-<span id="LC695" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- True <=> emit a hole constraints for an</span></span>

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<pre style="margin: 0;">-<span id="LC696" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">--          anonymous wildcard</span></span>

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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell">    <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HoleMode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span>      <span class="c1" style="color: #998; font-style: italic;">-- Type signatures:  f :: _ -> Int</span></span>

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<pre style="margin: 0;">+<span id="LC702" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- HoleMode says how to treat the occurrences</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of anonymous wildcards; see tcAnonWildCardOcc</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="704" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HoleMode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HM_NoHoles</span>  <span class="c1" style="color: #998; font-style: italic;">-- No wildcard expected</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC705" class="line" lang="haskell">              <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span>      <span class="c1" style="color: #998; font-style: italic;">-- Partial type signatures: f :: _ -> Int</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell">              <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</span>   <span class="c1" style="color: #998; font-style: italic;">-- Family instances: F _ Int = Bool</span></span>

</pre>

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701

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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell">              <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span>      <span class="c1" style="color: #998; font-style: italic;">-- Visible type and kind application:</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell">                            <span class="c1" style="color: #998; font-style: italic;">--   f @(Maybe _)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC709" class="line" lang="haskell">                            <span class="c1" style="color: #998; font-style: italic;">--   Maybe @(_ -> _)</span></span>

</pre>

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704

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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC705" class="line" lang="haskell"><span class="n" style="color: #333;">mkMode</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</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;">TcTyMode</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC706" class="line" lang="haskell"><span class="n" style="color: #333;">mkMode</span> <span class="n" style="color: #333;">tyki</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"><span class="n" style="color: #333;">holesOK</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HoleMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True <=> it's ok to encounter a hole</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Should have been checked by the renamer</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"><span class="n" style="color: #333;">holesOK</span> <span class="kt" style="color: #458; font-weight: 600;">HM_NoHoles</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="715" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"><span class="n" style="color: #333;">holesOK</span> <span class="kr" style="font-weight: 600;">_</span>          <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

</pre>

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716

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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcTyMode</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</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;">TcTyMode</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="707" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="718" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

718

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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcTyMode</span> <span class="n" style="color: #333;">tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkMode</span> <span class="n" style="color: #333;">tyki</span> <span class="kt" style="color: #458; font-weight: 600;">HM_NoHoles</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="707" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="719" 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">

719

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="707" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="720" 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">

720

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"><span class="n" style="color: #333;">mkMode</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HoleMode</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;">TcTyMode</span></span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="707" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="721" 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">

721

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"><span class="n" style="color: #333;">mkMode</span> <span class="n" style="color: #333;">tyki</span> <span class="n" style="color: #333;">hm</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="707" 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">

707

</td>

<td class="diff-line-num new_line" data-linenumber="722" 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">

722

</td>

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<pre style="margin: 0;"> <span id="LC722" 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;">lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="708" 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">

708

</td>

<td class="diff-line-num new_line" data-linenumber="723" 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">

723

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC723" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyki</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="709" 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">

709

</td>

<td class="diff-line-num new_line" data-linenumber="724" 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">

724

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC724" class="line" lang="haskell">                          <span class="p">,</span> <span class="n" style="color: #333;">mode_lvl</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lvl</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="710" 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">

710

</td>

<td class="diff-line-num new_line old" data-linenumber="725" 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="LC710" class="line" lang="haskell">                          <span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span> <span class="p">})</span> <span class="p">}</span></span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="711" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="725" 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">

725

</td>

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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell">                          <span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hm</span> <span class="p">})</span> <span class="p">}</span></span>

</pre>

</td>

</tr>

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<td class="diff-line-num new old_line" data-linenumber="711" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="726" 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">

726

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="711" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="727" 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">

727

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">HoleMode</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="711" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="728" 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">

728

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell">  <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">HM_NoHoles</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HM_NoHoles"</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="711" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="729" 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">

729

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC729" class="line" lang="haskell">  <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span>     <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HM_Sig"</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="711" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="730" 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">

730

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell">  <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HM_FamPat"</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="711" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="731" 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">

731

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell">  <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span>     <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HM_VTA"</span></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="711" 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">

711

</td>

<td class="diff-line-num new_line" data-linenumber="732" 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">

732

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="712" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

712

</td>

<td class="diff-line-num new_line" data-linenumber="733" 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">

733

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC733" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="713" 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">

713

</td>

<td class="diff-line-num new_line old" data-linenumber="734" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

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<pre style="margin: 0;">-<span id="LC713" class="line" lang="haskell">  <span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">mode_tyki</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="714" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="734" 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">

734

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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell">  <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyki</span><span class="p">,</span> <span class="n" style="color: #333;">mode_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lvl</span><span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hm</span> <span class="p">})</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="714" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="735" 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">

735

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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell">    <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"TcTyMode"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyki</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">comma</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="714" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="736" 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">

736

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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell">                                      <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hm</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">comma</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="714" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="737" 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">

737

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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell">                                      <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"lvl:"</span>  <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lvl</span> <span class="p">])</span></span>

</pre>

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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="738" 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">

738

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<pre style="margin: 0;"> <span id="LC738" class="line" lang="haskell"></span>

</pre>

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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="739" 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">

739

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<pre style="margin: 0;"> <span id="LC739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="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

</td>

<td class="diff-line-num new_line" data-linenumber="740" 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">

740

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<pre style="margin: 0;"> <span id="LC740" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Bidirectional type checking]</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="826" 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="850" 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">@@ -826,7 +850,7 @@ tc_infer_hs_type mode other_ty</td>

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<td class="diff-line-num old_line" data-linenumber="826" 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">

826

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<td class="diff-line-num new_line" data-linenumber="850" 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">

850

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<pre style="margin: 0;"> <span id="LC850" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="827" 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">

827

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<td class="diff-line-num new_line" data-linenumber="851" 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">

851

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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsType</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 class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="828" 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">

828

</td>

<td class="diff-line-num new_line" data-linenumber="852" 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">

852

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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">exp_kind</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="829" 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">

829

</td>

<td class="diff-line-num new_line old" data-linenumber="853" 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="LC829" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="830" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="853" 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">

853

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<pre style="margin: 0;">+<span id="LC853" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left right">TcTy</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="830" 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">

830

</td>

<td class="diff-line-num new_line" data-linenumber="854" 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">

854

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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">tc_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">exp_kind</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="831" 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">

831

</td>

<td class="diff-line-num new_line" data-linenumber="855" 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">

855

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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="832" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

832

</td>

<td class="diff-line-num new_line" data-linenumber="856" 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">

856

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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"><span class="n" style="color: #333;">tc_lhs_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;">TcKind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1630" 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="1654" 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">@@ -1630,11 +1654,11 @@ tcHsMbContext Nothing    = return []</td>

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<pre style="margin: 0;"> <span id="LC1654" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsMbContext</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cxt</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">cxt</span></span>

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<td class="diff-line-num new_line" data-linenumber="1655" 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="LC1655" class="line" lang="haskell"></span>

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<td class="diff-line-num new_line" data-linenumber="1656" 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="LC1656" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsContext</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsContext</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;">TcM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PredType</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="1657" 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="LC1633" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">cxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

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<pre style="margin: 0;">+<span id="LC1657" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">cxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left right">TcTy</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

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<pre style="margin: 0;"> <span id="LC1658" class="line" lang="haskell">                     <span class="p">;</span> <span class="n" style="color: #333;">tc_hs_context</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">cxt</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC1659" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1660" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsPredType</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;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC1637" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsPredType</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

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<pre style="margin: 0;">+<span id="LC1661" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsPredType</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left right">TcTy</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1662" class="line" lang="haskell">                        <span class="p">;</span> <span class="n" style="color: #333;">tc_lhs_pred</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">pred</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC1663" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1664" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_context</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;">LHsContext</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;">TcM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PredType</span><span class="p">]</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1877" 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="1901" 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">@@ -1877,13 +1901,16 @@ newNamedWildTyVar _name   -- Currently ignoring the "_x" wildcard name used in t</td>

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<pre style="margin: 0;"> <span id="LC1901" 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;">TcTyMode</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="LC1902" class="line" lang="haskell"><span class="n" style="color: #333;">tcAnonWildCardOcc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lvl</span><span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole_mode</span> <span class="p">})</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1879" 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">

1879

</td>

<td class="diff-line-num new_line" data-linenumber="1903" 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">

1903

</td>

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<pre style="margin: 0;"> <span id="LC1903" class="line" lang="haskell">                  <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">exp_kind</span></span>

</pre>

</td>

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<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1880" 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">

1880

</td>

<td class="diff-line-num new_line old" data-linenumber="1904" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1880" 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;">kv_details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTauTvDetailsAtLevel</span> <span class="n" style="color: #333;">lvl</span></span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1881" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1904" 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">

1904

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1904" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- mode_lvl field: see Note [Checking partial type signatures]</span></span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1881" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1905" 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">

1905

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1905" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- esp the bullet on nested forall types</span></span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1881" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1906" 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">

1906

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1906" 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;">holesOK</span> <span class="n" style="color: #333;">hole_mode</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span> <span class="p">)</span></span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1881" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1907" 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">

1907

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1907" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kv_details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTauTvDetailsAtLevel</span> <span class="n" style="color: #333;">lvl</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1881" 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">

1881

</td>

<td class="diff-line-num new_line" data-linenumber="1908" 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">

1908

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1908" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">kv_name</span>    <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVarName</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"k"</span><span class="p">)</span></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1882" 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">

1882

</td>

<td class="diff-line-num new_line" data-linenumber="1909" 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">

1909

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<pre style="margin: 0;"> <span id="LC1909" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">wc_details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTauTvDetailsAtLevel</span> <span class="n" style="color: #333;">lvl</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1883" 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">

1883

</td>

<td class="diff-line-num new_line" data-linenumber="1910" 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">

1910

</td>

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<pre style="margin: 0;"> <span id="LC1910" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">wc_name</span>    <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVarName</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="n" style="color: #333;">wc_nm</span><span class="p">)</span></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1884" 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">

1884

</td>

<td class="diff-line-num new_line" data-linenumber="1911" 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">

1911

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1911" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">kv</span>      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyVar</span> <span class="n" style="color: #333;">kv_name</span> <span class="n" style="color: #333;">liftedTypeKind</span> <span class="n" style="color: #333;">kv_details</span></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1885" 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">

1885

</td>

<td class="diff-line-num new_line" data-linenumber="1912" 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">

1912

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1912" class="line" lang="haskell">             <span class="n" style="color: #333;">wc_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">kv</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="1886" 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">

1886

</td>

<td class="diff-line-num new_line old" data-linenumber="1913" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC1886" class="line" lang="haskell">       <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">let</span></span> <span class="n" style="color: #333;">wc_tv</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyVar</span> <span class="n" style="color: #333;">wc_name</span> <span class="n" style="color: #333;">wc_kind</span> <span class="n" style="color: #333;">wc_details</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1887" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1913" 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">

1913

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1913" class="line" lang="haskell">       <span class="idiff left right">     </span> <span class="n" style="color: #333;">wc_tv</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyVar</span> <span class="n" style="color: #333;">wc_name</span> <span class="n" style="color: #333;">wc_kind</span> <span class="n" style="color: #333;">wc_details</span></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1887" 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">

1887

</td>

<td class="diff-line-num new_line" data-linenumber="1914" 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">

1914

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1914" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1888" 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">

1888

</td>

<td class="diff-line-num new_line" data-linenumber="1915" 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">

1915

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1915" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcAnonWildCardOcc"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lvl</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">emit_holes</span><span class="p">)</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1889" 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">

1889

</td>

<td class="diff-line-num new_line" data-linenumber="1916" 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">

1916

</td>

<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1916" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">emit_holes</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

</td>

</tr>

<tr class="line_holder match" id="" style="line-height: 1.6;">

<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1899" 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="1926" 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">@@ -1899,8 +1926,8 @@ tcAnonWildCardOcc (TcTyMode { mode_lvl = lvl, mode_holes = hole_mode })</td>

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1899

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<td class="diff-line-num new_line" data-linenumber="1926" 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">

1926

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<pre style="margin: 0;"> <span id="LC1926" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1900" 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">

1900

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<td class="diff-line-num new_line" data-linenumber="1927" 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">

1927

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<pre style="margin: 0;"> <span id="LC1927" class="line" lang="haskell">     <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wildcard names]</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1901" 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">

1901

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<td class="diff-line-num new_line" data-linenumber="1928" 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">

1928

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<pre style="margin: 0;"> <span id="LC1928" class="line" lang="haskell">     <span class="n" style="color: #333;">wc_nm</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">hole_mode</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1902" 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">

1902

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<td class="diff-line-num new_line old" data-linenumber="1929" 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="LC1902" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"_"</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1903" 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">

1903

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<td class="diff-line-num new_line" data-linenumber="1929" 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">

1929

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<pre style="margin: 0;"> <span id="LC1929" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">HM_Sig</span>    <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"w"</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1904" 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="1930" 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">

1930

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<pre style="margin: 0;">+<span id="LC1930" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">HM_FamPat</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"_"</span></span>

</pre>

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1904

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<td class="diff-line-num new_line" data-linenumber="1931" 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">

1931

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<pre style="margin: 0;"> <span id="LC1931" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">HM_VTA</span>    <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"w"</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1905" 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">

1905

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<td class="diff-line-num new_line" data-linenumber="1932" 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">

1932

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<pre style="margin: 0;"> <span id="LC1932" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1906" 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">

1906

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<td class="diff-line-num new_line" data-linenumber="1933" 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">

1933

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<pre style="margin: 0;"> <span id="LC1933" class="line" lang="haskell">     <span class="n" style="color: #333;">emit_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">hole_mode</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1916" 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="1943" 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">@@ -1916,10 +1943,10 @@ wildcard "w", not "_".  If we use the latter, we get messages like</td>

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1916

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1943

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<pre style="margin: 0;"> <span id="LC1943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which is a bit confusing.  I prefer</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1917" 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">

1917

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1944

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<pre style="margin: 0;"> <span id="LC1944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     Found type wildcard ‘_’ standing for ‘w0’</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1918" 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">

1918

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1945

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<pre style="margin: 0;"> <span id="LC1945" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1919" 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">

1919

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<td class="diff-line-num new_line old" data-linenumber="1946" 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="LC1919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, on the LHS of family instances we switch hole emission</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1920" 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">

1920

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<td class="diff-line-num new_line old" data-linenumber="1946" 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="LC1920" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">off (see Note [Wildcards in family instances] in GHC.Rename.Module</span></span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1921" 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">

1921

</td>

<td class="diff-line-num new_line old" data-linenumber="1946" 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="LC1921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">and tcFamTyPats above.  And for family insatnce we prefer to use "_"</span></span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1922" 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">

1922

</td>

<td class="diff-line-num new_line old" data-linenumber="1946" 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="LC1922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so that we can pretty-print the LHS as</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1923" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1946" 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">

1946

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<pre style="margin: 0;">+<span id="LC1946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, on the LHS of family instances we switch hole emission<span class="idiff left right"> off</span></span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1923" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1947" 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">

1947

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<pre style="margin: 0;">+<span id="LC1947" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">(see Note [Wildcards in family instances] in GHC.Rename.Module) by</span></span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1923" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1948" 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">

1948

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<pre style="margin: 0;">+<span id="LC1948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">using HM_FamPat in tcFamTyPats above.  And for family insatnce we</span></span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1923" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1949" 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">

1949

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<pre style="margin: 0;">+<span id="LC1949" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">prefer to use "_" </span>so that we can pretty-print the LHS as</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1923" 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">

1923

</td>

<td class="diff-line-num new_line" data-linenumber="1950" 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">

1950

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<pre style="margin: 0;"> <span id="LC1950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   F _ Int _ = ...</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1924" 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">

1924

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<td class="diff-line-num new_line" data-linenumber="1951" 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">

1951

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<pre style="margin: 0;"> <span id="LC1951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1925" 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">

1925

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<td class="diff-line-num new_line" data-linenumber="1952" 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">

1952

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<pre style="margin: 0;"> <span id="LC1952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   F w1 Int w2 = ...</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1927" 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="1954" 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">@@ -1927,7 +1954,7 @@ There is some unsavory magic, relying on that underscore,</td>

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<td class="diff-line-num old_line" data-linenumber="1927" 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">

1927

</td>

<td class="diff-line-num new_line" data-linenumber="1954" 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">

1954

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<pre style="margin: 0;"> <span id="LC1954" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in GHC.Core.Coercion.tidyCoAxBndrsForUser.</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1928" 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">

1928

</td>

<td class="diff-line-num new_line" data-linenumber="1955" 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">

1955

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<pre style="margin: 0;"> <span id="LC1955" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1929" 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">

1929

</td>

<td class="diff-line-num new_line" data-linenumber="1956" 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">

1956

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<pre style="margin: 0;"> <span id="LC1956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we hackily use the mode_holes flag to control the name used</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1930" 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">

1930

</td>

<td class="diff-line-num new_line old" data-linenumber="1957" 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="LC1930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for wildcards.  Ugh.  But it works</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1931" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1957" 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">

1957

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<pre style="margin: 0;">+<span id="LC1957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for wildcards.  Ugh.  But it works<span class="idiff left right">.</span></span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1931" 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">

1931

</td>

<td class="diff-line-num new_line" data-linenumber="1958" 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">

1958

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<pre style="margin: 0;"> <span id="LC1958" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1932" 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">

1932

</td>

<td class="diff-line-num new_line" data-linenumber="1959" 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">

1959

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<pre style="margin: 0;"> <span id="LC1959" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Wildcards in visible kind application]</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1933" 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">

1933

</td>

<td class="diff-line-num new_line" data-linenumber="1960" 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">

1960

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<pre style="margin: 0;"> <span id="LC1960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

</td>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3295" 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="3322" 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">@@ -3295,7 +3322,7 @@ tcHsPartialSigType ctxt sig_ty</td>

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<td class="diff-line-num old_line" data-linenumber="3295" 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">

3295

</td>

<td class="diff-line-num new_line" data-linenumber="3322" 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">

3322

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<pre style="margin: 0;"> <span id="LC3322" class="line" lang="haskell">         <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ib_ty</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3296" 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">

3296

</td>

<td class="diff-line-num new_line" data-linenumber="3323" 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">

3323

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<pre style="margin: 0;"> <span id="LC3323" 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;">splitLHsSigmaTyInvis</span> <span class="n" style="color: #333;">hs_ty</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3297" 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">

3297

</td>

<td class="diff-line-num new_line" data-linenumber="3324" 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">

3324

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<pre style="margin: 0;"> <span id="LC3324" 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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="3298" 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">

3298

</td>

<td class="diff-line-num new_line old" data-linenumber="3325" 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="LC3298" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3325" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3325" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">HM_Sig</span></span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3299" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="3326" 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">

3326

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<pre style="margin: 0;"> <span id="LC3326" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">implicit_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">explicit_tvs</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)))</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3300" 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">

3300

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<td class="diff-line-num new_line" data-linenumber="3327" 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">

3327

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<pre style="margin: 0;"> <span id="LC3327" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3301" 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">

3301

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<td class="diff-line-num new_line" data-linenumber="3328" 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">

3328

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<pre style="margin: 0;"> <span id="LC3328" 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>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3323" 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="3350" 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">@@ -3323,8 +3350,8 @@ tcHsPartialSigType ctxt sig_ty</td>

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<td class="diff-line-num old_line" data-linenumber="3323" 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="LC3350" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">emitNamedWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="3351" 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">

3351

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<pre style="margin: 0;"> <span id="LC3351" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3325" 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">

3325

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<td class="diff-line-num new_line" data-linenumber="3352" 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">

3352

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<pre style="margin: 0;"> <span id="LC3352" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Zonk, so that any nested foralls can "see" their occurrences</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="3326" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="3353" 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="LC3326" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking partial type signatures], <span class="idiff left right">in</span></span></span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="3353" 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="LC3327" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">the bullet on Nested foralls.</span></span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3328" 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="3353" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3353" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking partial type signatures], <span class="idiff left right">and in particular</span></span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3328" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="3354" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3354" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Note [Levels for wildcards]</span></span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="3355" 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">

3355

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<pre style="margin: 0;"> <span id="LC3355" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">implicit_tvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">zonkTcTyVarToTyVar</span> <span class="n" style="color: #333;">implicit_tvs</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3329" 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">

3329

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<td class="diff-line-num new_line" data-linenumber="3356" 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">

3356

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<pre style="margin: 0;"> <span id="LC3356" 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;">zonkTcTyVarToTyVar</span> <span class="n" style="color: #333;">explicit_tvs</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3330" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="3357" 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">

3357

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<pre style="margin: 0;"> <span id="LC3357" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">theta</span>        <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">theta</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3396" 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="3423" 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">@@ -3396,23 +3423,7 @@ we do the following</td>

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3396

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<td class="diff-line-num new_line" data-linenumber="3423" 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="LC3423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     g x = True</span></span>

</pre>

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3397

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<td class="diff-line-num new_line" data-linenumber="3424" 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="LC3424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  It's really as if we'd written two distinct signatures.</span></span>

</pre>

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3398

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<td class="diff-line-num new_line" data-linenumber="3425" 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">

3425

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<pre style="margin: 0;"> <span id="LC3425" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

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<td class="diff-line-num old old_line" data-linenumber="3399" 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">

3399

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Nested foralls. Consider</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="3400" 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">

3400

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     f :: forall b. (forall a. a -> _) -> b</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="3401" 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">

3401

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  We do /not/ allow the "_" to be instantiated to 'a'; but we do</span></span>

</pre>

</td>

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<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="3402" 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">

3402

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  (as before) allow it to be instantiated to the (top level) 'b'.</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="3403" 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">

3403

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  Why not?  Because suppose</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="3404" 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">

3404

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     f x = (x True, x 'c')</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="3405" 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">

3405

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  We must instantiate that (forall a. a -> _) when typechecking</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="3406" 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">

3406

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  f's body, so we must know precisely where all the a's are; they</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="3407" 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">

3407

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  must not be hidden under (filled-in) unification variables!</span></span>

</pre>

</td>

</tr>

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<td class="diff-line-num old old_line" data-linenumber="3408" 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">

3408

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC3408" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

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<td class="diff-line-num old old_line" data-linenumber="3409" 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">

3409

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  We achieve this:</span></span>

</pre>

</td>

</tr>

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<td class="diff-line-num old old_line" data-linenumber="3410" 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">

3410

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - For /named/ wildcards, we create them at the outer level, and push</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="3411" 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">

3411

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    the level when we go inside a forall.  So now the unification</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="3412" 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">

3412

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    variable for the "_" can't unify with 'a'.</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="3413" 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">

3413

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - For /anonymous/ wildcards, we float them all out in</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="3414" 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">

3414

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    floatKindEqualities, and promote them in emitFlatConstraints.</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="3415" 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">

3415

</td>

<td class="diff-line-num new_line old" data-linenumber="3426" 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="LC3415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    See Note [Failure in local type signatures] in GHC.Tc.Solver.</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="3416" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="3426" 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">

3426

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<pre style="margin: 0;">+<span id="LC3426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Nested foralls. See Note [Levels for wildcards]</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="3416" 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">

3416

</td>

<td class="diff-line-num new_line" data-linenumber="3427" 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">

3427

</td>

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<pre style="margin: 0;"> <span id="LC3427" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="3417" 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">

3417

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<pre style="margin: 0;"> <span id="LC3428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Just as for ordinary signatures, we must zonk the type after</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3418" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="3429" 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="LC3429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  kind-checking it, to ensure that all the nested forall binders can</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3423" 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="3434" 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">@@ -3423,6 +3434,36 @@ we do the following</td>

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<pre style="margin: 0;"> <span id="LC3434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       foo :: (forall a. (Show a => blah) |> Refl) -> _</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="3435" 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="LC3435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  and that Refl cast messed things up.  See #18062.</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3425" 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">

3425

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<td class="diff-line-num new_line" data-linenumber="3436" 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">

3436

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<pre style="margin: 0;"> <span id="LC3436" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3426" 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="3437" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3437" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Levels for wildcards]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3438" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3439" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3440" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     f :: forall b. (forall a. a -> _) -> b</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3441" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do /not/ allow the "_" to be instantiated to 'a'; although we do</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3426" 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="3442" 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">

3442

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<pre style="margin: 0;">+<span id="LC3442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(as before) allow it to be instantiated to the (top level) 'b'.</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="3443" 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">

3443

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<pre style="margin: 0;">+<span id="LC3443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why not?  Suppose</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3444" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   f x = (x True, x 'c')</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3426" 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="3445" 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">

3445

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<pre style="margin: 0;">+<span id="LC3445" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3426" 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="3446" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">During typecking the RHS we must instantiate that (forall a. a -> _),</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3426" 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="3447" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3447" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so we must know /precisely/ where all the a's are; they must not be</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3426" 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="3448" 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">

3448

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<pre style="margin: 0;">+<span id="LC3448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">hidden under (possibly-not-yet-filled-in) unification variables!</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3426" 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="3449" 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">

3449

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<pre style="margin: 0;">+<span id="LC3449" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3426" 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="3450" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We achieve this as follows:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC3451" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3452" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- For /named/ wildcards such sas</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3453" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     g :: forall b. (forall la. a -> _x) -> b</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3454" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  there is no problem: we create them at the outer level (ie the</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3455" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  ambient level of teh signature itself), and push the level when we</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3456" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  go inside a forall.  So now the unification variable for the "_x"</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3457" 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">

3457

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<pre style="margin: 0;">+<span id="LC3457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  can't unify with skolem 'a'.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3458" 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">

3458

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<pre style="margin: 0;">+<span id="LC3458" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3426" 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="3459" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- For /anonymous/ wildcards, such as 'f' above, we carry the ambient</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3460" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  level of the signature to the hole in the mode_lvl field of</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3461" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  TcTyMode.  Then, in tcAnonWildCardOcc we us that level (and /not/</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3462" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  the level ambient at the occurrence of "_") to create the</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3463" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3463" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  unificaiton variable for the wildcard.  That is the sole</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3464" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  purpose of the mode_lvl field: to transport the ambient level</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3465" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  of the signature down to the anonymous wildcard occurrences.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="3466" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC3466" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC3467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Extra-constraint holes in partial type signatures]</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC3468" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC3469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3597" 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="3638" 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">@@ -3597,7 +3638,7 @@ It does sort checking and desugaring at the same time, in one single pass.</td>

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3638

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<pre style="margin: 0;"> <span id="LC3638" class="line" lang="haskell"></span>

</pre>

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3598

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3639

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<pre style="margin: 0;"> <span id="LC3639" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsKindSig</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsKind</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;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3599" 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">

3599

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3640

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<pre style="margin: 0;"> <span id="LC3640" class="line" lang="haskell"><span class="n" style="color: #333;">tcLHsKindSig</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_kind</span></span>

</pre>

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3600

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<td class="diff-line-num new_line old" data-linenumber="3641" 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="LC3600" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkMode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3601" 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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3641

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<pre style="margin: 0;">+<span id="LC3641" 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;">mode</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk<span class="idiff left right">TcTy</span>Mode</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span></span>

</pre>

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3601

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3642

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<pre style="margin: 0;"> <span id="LC3642" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">tc_lhs_kind_sig</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_kind</span> <span class="p">}</span></span>

</pre>

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3643

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<pre style="margin: 0;"> <span id="LC3643" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC3644" class="line" lang="haskell"><span class="n" style="color: #333;">tc_lhs_kind_sig</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;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsKind</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;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span></span>

</pre>

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<li id="3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04e23aea46b26442dca59f4bcf57d5d91a775da0#3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9"><strong>compiler/GHC/Tc/Gen/Match.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="98" 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="98" 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">@@ -98,7 +98,7 @@ tcMatchesFun fn@(L _ fun_name) matches exp_ty</td>

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98

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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">checkArgs</span> <span class="n" style="color: #333;">fun_name</span> <span class="n" style="color: #333;">matches</span></span>

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99

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99

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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="100" 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">

100

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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">matchExpectedFunTys</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">exp_ty</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">pat_tys</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">-></span></span>

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<td class="diff-line-num old old_line" data-linenumber="101" 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="LC101" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- NB: exp_type may be polymo<span class="idiff left right">pr</span>hic, but</span></span>

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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- NB: exp_type may be polymo<span class="idiff left right">rp</span>hic, but</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">--     matchExpectedFunTys can cope with that</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="103" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="103" 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">

103

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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell">          <span class="n" style="color: #333;">tcMatches</span> <span class="n" style="color: #333;">match_ctxt</span> <span class="n" style="color: #333;">pat_tys</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="n" style="color: #333;">matches</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="104" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

104

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<td class="diff-line-num new_line" data-linenumber="104" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

104

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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<br>

</li>

<li id="74295edeac870ee7f2f3484ebaffab5c948b735a">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04e23aea46b26442dca59f4bcf57d5d91a775da0#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.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">@@ -163,7 +163,7 @@ matchExpectedFunTys herald ctx arity orig_ty thing_inside</td>

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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell">                                               <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">acc_arg_tys</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ty'</span></span>

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<pre style="margin: 0;"> <span id="LC164" 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;">wrap_gen</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">wrap_res</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- No more args; do this<span class="idiff left right">before</span> tcView, so</span></span>

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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- No more args; do this<span class="idiff left right"> /before/</span> tcView, so</span></span>

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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- that we do not unnecessarily unwrap synonyms</span></span>

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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell">    <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">acc_arg_tys</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">rho_ty</span></span>

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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing_inside</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">acc_arg_tys</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">rho_ty</span><span class="p">)</span></span>

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<br>

</li>

<li id="a7e2c335af4a53c47c2eeedda7ddc3a839a4a1be">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04e23aea46b26442dca59f4bcf57d5d91a775da0#a7e2c335af4a53c47c2eeedda7ddc3a839a4a1be"><strong>testsuite/tests/partial-sigs/should_compile/TypeFamilyInstanceLHS.stderr</strong></a>

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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">  type family F{2} :: * -> * -> *</span>

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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">    roles nominal nominal</span>

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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">COERCION AXIOMS</span>

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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">  axiom TypeFamilyInstanceLHS.D:R:FBool<span class="idiff left right">w :: F Bool w</span> = Bool</span>

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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">  axiom TypeFamilyInstanceLHS.D:R:FInt<span class="idiff left right">w :: F Int w</span> = Int</span>

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">  axiom TypeFamilyInstanceLHS.D:R:FBool<span class="idiff left right">_1 :: F Bool _1</span> = Bool</span>

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">  axiom TypeFamilyInstanceLHS.D:R:FInt<span class="idiff left right">_1 :: F Int _1</span> = Int</span>

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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">FAMILY INSTANCES</span>

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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext">  type instance F Int <span class="idiff left right">w</span> = Int</span>

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">  type instance F Int <span class="idiff left right">_</span> = Int</span>

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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext">                  -- Defined at TypeFamilyInstanceLHS.hs:7:15</span>

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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext">  type instance F Bool <span class="idiff left right">w</span> = Bool</span>

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">  type instance F Bool <span class="idiff left right">_</span> = Bool</span>

</pre>

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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext">                  -- Defined at TypeFamilyInstanceLHS.hs:8:15</span>

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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">Dependent modules: []</span>

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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext">Dependent packages: [base-4.14.0.0, ghc-prim-0.6.1,</span>

</pre>

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<br>

</li>

<li id="5bab311b35c799ac81803fd69323e3bf25d7bf00">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04e23aea46b26442dca59f4bcf57d5d91a775da0#5bab311b35c799ac81803fd69323e3bf25d7bf00"><strong>testsuite/tests/polykinds/T9569.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="23" 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="23" 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">@@ -23,16 +23,20 @@ instance (Deferrable c1, Deferrable c2) => Deferrable (c1,c2) where</td>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Notes Apr 2020.</span></span>

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<pre style="margin: 0;"> <span id="LC25" 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="LC26" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Wow, this is horrible! If you</span> say</span></span>

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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Note the careful type for deferPair!  You can also</span> say</span></span>

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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">deferPair :: (Deferrable c1, Deferrable c2, d ~ (c1,c2))</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          => Proxy (c1,c2) -> (d => a) -> a</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC30" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then it all works.  The point is that</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="31" 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="31" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but NOT</span></span>

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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">deferPair :: (Deferrable c1, Deferrable c2)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="31" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="34" 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">

34

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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          => Proxy (c1,c2) -> ((c1,c2) => a) -> a</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="31" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="35" 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">

35

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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="31" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="36" 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">

36

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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The point is that</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="31" 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">

31

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<td class="diff-line-num new_line" data-linenumber="37" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

37

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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  (c1,c2) => a</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="32" 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">

32

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<td class="diff-line-num new_line" data-linenumber="38" 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">

38

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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is short for</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="33" 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">

33

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<td class="diff-line-num new_line" data-linenumber="39" 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">

39

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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  c1 => c2 => a</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="34" 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">

34

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<td class="diff-line-num new_line old" data-linenumber="40" 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="LC34" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and we have no source language notation for the form that takes</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="35" 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">

35

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<td class="diff-line-num new_line old" data-linenumber="40" 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="LC35" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a single constraint tuple.</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="36" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

36

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<td class="diff-line-num new_line" data-linenumber="40" 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">

40

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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="37" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

37

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<td class="diff-line-num new_line" data-linenumber="41" 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">

41

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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="38" 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">

38

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<td class="diff-line-num new_line" data-linenumber="42" 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">

42

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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>

</pre>

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