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<h3>

Ryan Scott pushed to branch wip/T18065

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

</h3>

<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cde7683be2c71f6142aa5f39ff18f0ab9a170f75">cde7683b</a></strong>

<div>

<span>by Ryan Scott</span>

<i>at 2020-04-16T13:10:29-04:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18065 by fixing an InstCo oversight in Core Lint

There was a small thinko in Core Lint's treatment of `InstCo`

coercions that ultimately led to #18065. The fix: add an apostrophe.

That's it!

Fixes #18065.

Co-authored-by: Simon Peyton Jones <simonpj@microsoft.com>

</pre>

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<h4>3 changed files:</h4>

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<li class="file-stats">

<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">

compiler/GHC/Core/Lint.hs

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<a href="#3ddcbe2b589c5a10612c5ede936a800e92038962">

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+

testsuite/tests/indexed-types/should_compile/T18065.hs

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<a href="#58b9bc2ffb1c7d7b545e6aada524a5d53266e95e">

testsuite/tests/indexed-types/should_compile/all.T

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<h4>Changes:</h4>

<li id="36a42448a83a9d1f6df8475f03ead2eed199dd8e">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cde7683be2c71f6142aa5f39ff18f0ab9a170f75#36a42448a83a9d1f6df8475f03ead2eed199dd8e"><strong>compiler/GHC/Core/Lint.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2030" style="width: 35px; color: rgba(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">@@ -2030,21 +2030,21 @@ lintCoercion the_co@(LRCo lr co)</td>

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<pre style="margin: 0;"> <span id="LC2030" class="line" lang="haskell"><span class="n" style="color: #333;">lintCoercion</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstCo</span> <span class="n" style="color: #333;">co</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC2031" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">co'</span>  <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCoercion</span> <span class="n" style="color: #333;">co</span></span>

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<pre style="margin: 0;"> <span id="LC2032" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">arg'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCoercion</span> <span class="n" style="color: #333;">arg</span></span>

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<pre style="margin: 0;">-<span id="LC2033" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">t1<span class="idiff left">'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">t2'</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKind</span> <span class="n" style="color: #333;">co'</span></span>

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<pre style="margin: 0;">-<span id="LC2034" class="line" lang="haskell">             <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">s1</span> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">s2</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">coercionKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arg</span></span></span>

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<pre style="margin: 0;">+<span id="LC2033" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">t1</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">t2</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKind</span> <span class="n" style="color: #333;">co'</span></span>

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<pre style="margin: 0;">+<span id="LC2034" class="line" lang="haskell">             <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;"><span class="idiff left">s2</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">coercionKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arg'</span></span></span>

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<pre style="margin: 0;"> <span id="LC2035" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC2036" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">lintRole</span> <span class="n" style="color: #333;">arg</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="p">(</span><span class="n" style="color: #333;">coercionRole</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC2037" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC2038" class="line" lang="haskell">      <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">splitForAllTy_ty_maybe</span> <span class="n" style="color: #333;">t1<span class="idiff left">'</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">splitForAllTy_ty_maybe</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">t2'</span></span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>

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<pre style="margin: 0;">+<span id="LC2038" class="line" lang="haskell">      <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">splitForAllTy_ty_maybe</span> <span class="n" style="color: #333;">t1</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">splitForAllTy_ty_maybe</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">t2</span></span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>

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<pre style="margin: 0;"> <span id="LC2039" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- forall over tvar</span></span>

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<pre style="margin: 0;"> <span id="LC2040" class="line" lang="haskell">         <span class="p">{</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tv1</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tv2</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">))</span></span>

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2041

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2041

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<pre style="margin: 0;"> <span id="LC2041" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">s1</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv1</span></span>

</pre>

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2042

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2042

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<pre style="margin: 0;"> <span id="LC2042" class="line" lang="haskell">             <span class="p">,</span> <span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">s2</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv2</span></span>

</pre>

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2043

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2043

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<pre style="margin: 0;"> <span id="LC2043" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstCo</span> <span class="n" style="color: #333;">co'</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2044" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

2044

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2044

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<pre style="margin: 0;"> <span id="LC2044" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2045" 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">

2045

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<pre style="margin: 0;">-<span id="LC2045" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failWithL</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Kind mis-match in inst coercion<span class="idiff left right">"</span></span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC2045" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failWithL</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Kind mis-match in inst coercion<span class="idiff left">1"</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">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">co</span></span><span class="p">)</span></span>

</pre>

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2046

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2046

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<pre style="margin: 0;"> <span id="LC2046" class="line" lang="haskell"></span>

</pre>

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2047

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<pre style="margin: 0;">-<span id="LC2047" class="line" lang="haskell">         <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">splitForAllTy_co_maybe</span> <span class="n" style="color: #333;">t1<span class="idiff left">'</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">splitForAllTy_co_maybe</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">t2'</span></span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC2047" class="line" lang="haskell">         <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">splitForAllTy_co_maybe</span> <span class="n" style="color: #333;">t1</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">splitForAllTy_co_maybe</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">t2</span></span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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2048

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<pre style="margin: 0;"> <span id="LC2048" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- forall over covar</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC2049" class="line" lang="haskell">         <span class="p">{</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">cv1</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">cv2</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC2050" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">s1</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">cv1</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2053" style="width: 35px; color: rgba(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="2053" style="width: 35px; color: rgba(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">@@ -2053,7 +2053,7 @@ lintCoercion (InstCo co arg)</td>

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<td class="diff-line-num old_line" data-linenumber="2053" style="width: 35px; color: rgba(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="LC2053" class="line" lang="haskell">             <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">s2</span></span>

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<pre style="margin: 0;"> <span id="LC2054" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstCo</span> <span class="n" style="color: #333;">co'</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC2055" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2056" 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">

2056

</td>

<td class="diff-line-num new_line old" data-linenumber="2056" 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="LC2056" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failWithL</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Kind mis-match in inst coercion<span class="idiff left right">"</span></span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="2057" style="width: 35px; color: rgba(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="2056" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

2056

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<pre style="margin: 0;">+<span id="LC2056" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failWithL</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Kind mis-match in inst coercion<span class="idiff left">2"</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">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">co</span></span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2057" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

2057

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<td class="diff-line-num new_line" data-linenumber="2057" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

2057

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<pre style="margin: 0;"> <span id="LC2057" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2058" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

2058

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<td class="diff-line-num new_line" data-linenumber="2058" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

2058

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<pre style="margin: 0;"> <span id="LC2058" class="line" lang="haskell">         <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failWithL</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Bad argument of inst"</span><span class="p">)</span> <span class="p">}}}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2059" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

2059

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<td class="diff-line-num new_line" data-linenumber="2059" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

2059

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<pre style="margin: 0;"> <span id="LC2059" class="line" lang="haskell"></span>

</pre>

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<br>

</li>

<li id="3ddcbe2b589c5a10612c5ede936a800e92038962">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cde7683be2c71f6142aa5f39ff18f0ab9a170f75#3ddcbe2b589c5a10612c5ede936a800e92038962"><strong>testsuite/tests/indexed-types/should_compile/T18065.hs</strong></a>

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

1

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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds #-}</span></span>

</pre>

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

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<td class="diff-line-num new new_line" data-linenumber="2" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

2

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>

</pre>

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

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<td class="diff-line-num new new_line" data-linenumber="3" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

3

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>

</pre>

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

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<td class="diff-line-num new new_line" data-linenumber="4" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>

</pre>

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

5

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables #-}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="6" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

6

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeApplications #-}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="7" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

7

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>

</pre>

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8

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeOperators #-}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="9" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

9

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UndecidableInstances #-}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="10" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

10

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18065</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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11

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>

</pre>

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12

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="13" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

13

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>

</pre>

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14

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>

</pre>

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15

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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>

</pre>

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16

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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">TyFun</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;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>

</pre>

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17

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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyFun</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>

</pre>

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18

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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">infixr</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">~></span></span>

</pre>

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19

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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Apply</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span></span>

</pre>

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20

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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>

</pre>

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21

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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">SingFunction1</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">t</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Apply</span><span class="p">`</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">singFun1</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">f</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">SingFunction1</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">f</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="23" style="width: 35px; color: rgba(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="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">singFun1</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SLambda</span> <span class="n" style="color: #333;">f</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="24" style="width: 35px; color: rgba(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="LC24" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">SingFunction2</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">t1</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">t2</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Apply</span><span class="p">`</span> <span class="n" style="color: #333;">t1</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Apply</span><span class="p">`</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">singFun2</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">f</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">SingFunction2</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">f</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">singFun2</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SLambda</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">singFun1</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">SLambda</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>

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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">SLambda</span> <span class="p">{</span> <span class="n" style="color: #333;">applySing</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">t</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Apply</span><span class="p">`</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SLambda</span></span>

</pre>

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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="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SList</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">SNil</span>  <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SList</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">SCons</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SList</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span></span>

</pre>

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<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">

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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SList</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SNonEmpty</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="39" style="width: 35px; color: rgba(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="LC39" class="line" lang="haskell">  <span class="p">(</span><span class="o" style="font-weight: 600;">:%|</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SNonEmpty</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:|</span><span class="n" style="color: #333;">xs</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SNonEmpty</span></span>

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<td class="diff-line-num new new_line" data-linenumber="41" style="width: 35px; color: rgba(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="LC41" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="43" style="width: 35px; color: rgba(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="LC43" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">IdSym0</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Apply</span> <span class="kt" style="color: #458; font-weight: 600;">IdSym0</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="n" style="color: #333;">x</span></span>

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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"><span class="n" style="color: #333;">sId</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="n" style="color: #333;">sId</span> <span class="n" style="color: #333;">sx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sx</span></span>

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<td class="diff-line-num new new_line" data-linenumber="48" style="width: 35px; color: rgba(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="LC48" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="p">(</span><span class="o" style="font-weight: 600;">.</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">c</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell">  <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">g</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Apply</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">g</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Apply</span><span class="p">`</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="p">(</span><span class="o" style="font-weight: 600;">.@#@$</span><span class="p">)</span>   <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">~></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">c</span></span>

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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="p">(</span><span class="o" style="font-weight: 600;">.@#@$$</span><span class="p">)</span>  <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">c</span></span>

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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="p">(</span><span class="o" style="font-weight: 600;">.@#@$$$</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">c</span></span>

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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Apply</span>  <span class="p">(</span><span class="o" style="font-weight: 600;">.@#@$</span><span class="p">)</span>   <span class="n" style="color: #333;">f</span>       <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">.@#@$$</span><span class="p">)</span>  <span class="n" style="color: #333;">f</span></span>

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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Apply</span> <span class="p">((</span><span class="o" style="font-weight: 600;">.@#@$$</span><span class="p">)</span>  <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="n" style="color: #333;">g</span>    <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">.@#@$$$</span><span class="p">)</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">g</span></span>

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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Apply</span> <span class="p">((</span><span class="o" style="font-weight: 600;">.@#@$$$</span><span class="p">)</span> <span class="n" style="color: #333;">f</span>  <span class="n" style="color: #333;">g</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">g</span><span class="p">)</span> <span class="n" style="color: #333;">x</span></span>

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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"><span class="p">(</span><span class="o" style="font-weight: 600;">%.</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span></span>

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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell">        <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">((</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">g</span><span class="p">)</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>

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<td class="diff-line-num new new_line" data-linenumber="59" style="width: 35px; color: rgba(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="LC59" class="line" lang="haskell"><span class="p">(</span><span class="o" style="font-weight: 600;">%.</span><span class="p">)</span> <span class="n" style="color: #333;">sf</span> <span class="n" style="color: #333;">sg</span> <span class="n" style="color: #333;">sx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sf</span> <span class="p">`</span><span class="n" style="color: #333;">applySing</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">sg</span> <span class="p">`</span><span class="n" style="color: #333;">applySing</span><span class="p">`</span> <span class="n" style="color: #333;">sx</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="60" style="width: 35px; color: rgba(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="LC60" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Go</span> <span class="p">(</span><span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">])</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">Go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">z</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">]</span>    <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">z</span></span>

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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">Go</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">ys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">k</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Apply</span><span class="p">`</span> <span class="n" style="color: #333;">y</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Apply</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">Go</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">ys</span></span>

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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">GoSym</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span></span>

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<td class="diff-line-num new new_line" data-linenumber="65" style="width: 35px; color: rgba(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="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Apply</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GoSym</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span><span class="p">)</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Go</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">l</span></span>

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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Listfoldr</span> <span class="p">(</span><span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">])</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">Listfoldr</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Go</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">l</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="n" style="color: #333;">sListfoldr</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="p">(</span><span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">])</span><span class="o" style="font-weight: 600;">.</span></span>

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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell">              <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Listfoldr</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="n" style="color: #333;">sListfoldr</span> <span class="n" style="color: #333;">sk</span> <span class="n" style="color: #333;">sz</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sGo</span></span>

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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell">    <span class="n" style="color: #333;">sGo</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">l'</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">l'</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GoSym</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">z</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Apply</span><span class="p">`</span> <span class="n" style="color: #333;">l'</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell">    <span class="n" style="color: #333;">sGo</span> <span class="kt" style="color: #458; font-weight: 600;">SNil</span>             <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sz</span></span>

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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell">    <span class="n" style="color: #333;">sGo</span> <span class="p">(</span><span class="n" style="color: #333;">sy</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">SCons</span><span class="p">`</span> <span class="n" style="color: #333;">sys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sk</span> <span class="p">`</span><span class="n" style="color: #333;">applySing</span><span class="p">`</span> <span class="n" style="color: #333;">sy</span> <span class="p">`</span><span class="n" style="color: #333;">applySing</span><span class="p">`</span> <span class="n" style="color: #333;">sGo</span> <span class="n" style="color: #333;">sys</span></span>

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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">PMonoid</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Mempty</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Mappend</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">MappendSym0</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">MappendSym1</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Apply</span>  <span class="kt" style="color: #458; font-weight: 600;">MappendSym0</span> <span class="n" style="color: #333;">x</span>    <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MappendSym1</span> <span class="n" style="color: #333;">x</span></span>

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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Apply</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MappendSym1</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Mappend</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>

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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">SMonoid</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell">  <span class="n" style="color: #333;">sMempty</span>  <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Mempty</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell">  <span class="n" style="color: #333;">sMappend</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Mappend</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="87" style="width: 35px; color: rgba(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="LC87" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">PFoldable</span> <span class="n" style="color: #333;">t</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Foldr</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">PFoldable</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Foldr</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Listfoldr</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">l</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">SFoldable</span> <span class="n" style="color: #333;">t</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell">  <span class="n" style="color: #333;">sFoldr</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">a</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span></span>

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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell">            <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Foldr</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>

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<td class="diff-line-num new new_line" data-linenumber="94" style="width: 35px; color: rgba(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="LC94" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">SFoldable</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="95" style="width: 35px; color: rgba(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="LC95" class="line" lang="haskell">  <span class="n" style="color: #333;">sFoldr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sListfoldr</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">FoldMap</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">m</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<td class="diff-line-num new new_line" data-linenumber="98" style="width: 35px; color: rgba(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="LC98" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">FoldMap</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Foldr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MappendSym0</span> <span class="o" style="font-weight: 600;">.@#@$$$</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Mempty</span> <span class="n" style="color: #333;">l</span></span>

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99

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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="n" style="color: #333;">sFoldMap</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~></span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">a</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span></span>

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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell">            <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SFoldable</span> <span class="n" style="color: #333;">t</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SMonoid</span> <span class="n" style="color: #333;">m</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell">         <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FoldMap</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="n" style="color: #333;">sFoldMap</span> <span class="n" style="color: #333;">sf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sFoldr</span> <span class="p">(</span><span class="n" style="color: #333;">singFun2</span> <span class="o" style="font-weight: 600;">@</span><span class="p">((</span><span class="o" style="font-weight: 600;">.@#@$$</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">MappendSym0</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">singFun2</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MappendSym0</span> <span class="n" style="color: #333;">sMappend</span> <span class="o" style="font-weight: 600;">%.</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">applySing</span><span class="p">`</span> <span class="n" style="color: #333;">sf</span><span class="p">)</span> <span class="n" style="color: #333;">sMempty</span></span>

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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="104" style="width: 35px; color: rgba(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="LC104" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">NEFold</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">m</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<td class="diff-line-num new new_line" data-linenumber="105" style="width: 35px; color: rgba(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="LC105" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">NEFold</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">:|</span> <span class="n" style="color: #333;">as</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Mappend</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">FoldMap</span> <span class="kt" style="color: #458; font-weight: 600;">IdSym0</span> <span class="n" style="color: #333;">as</span></span>

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<td class="diff-line-num new new_line" data-linenumber="106" style="width: 35px; color: rgba(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="LC106" class="line" lang="haskell"><span class="n" style="color: #333;">sNEFold</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">m</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">SMonoid</span> <span class="n" style="color: #333;">m</span></span>

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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell">        <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Sing</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NEFold</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>

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<td class="diff-line-num new new_line" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="n" style="color: #333;">sNEFold</span> <span class="p">(</span><span class="n" style="color: #333;">sa</span> <span class="o" style="font-weight: 600;">:%|</span> <span class="n" style="color: #333;">sas</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sa</span> <span class="p">`</span><span class="n" style="color: #333;">sMappend</span><span class="p">`</span> <span class="n" style="color: #333;">sFoldMap</span> <span class="p">(</span><span class="n" style="color: #333;">singFun1</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">IdSym0</span> <span class="n" style="color: #333;">sId</span><span class="p">)</span> <span class="n" style="color: #333;">sas</span></span></pre>

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<br>

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<li id="58b9bc2ffb1c7d7b545e6aada524a5d53266e95e">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cde7683be2c71f6142aa5f39ff18f0ab9a170f75#58b9bc2ffb1c7d7b545e6aada524a5d53266e95e"><strong>testsuite/tests/indexed-types/should_compile/all.T</strong></a>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -295,3 +295,4 @@ test('T17008b', normal, compile, [''])</td>

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<pre style="margin: 0;"> <span id="LC295" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17056</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>

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<pre style="margin: 0;"> <span id="LC296" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17405</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">multimod_compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T17405c</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">-v0</span><span class="p">'])</span></span>

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<pre style="margin: 0;"> <span id="LC297" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17923</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>

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<pre style="margin: 0;">+<span id="LC298" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18065</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O</span><span class="p">'])</span></span></pre>

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