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<h3>

Vladislav Zavialov pushed to branch wip/cusk-ext

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/9a207a88df92c6c84c17f88d96a264fb3fd3e60f">9a207a88</a></strong>

<div>

<span>by Vladislav Zavialov</span>

<i>at 2019-05-09T07:43:05Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Guard CUSKs behind a language pragma

GHC Proposal #36 describes a transition plan away from CUSKs and to

top-level kind signatures:

1. Introduce a new extension, -XCUSKs, on by default, that detects CUSKs

   as they currently exist.

2. We turn off the -XCUSKs extension in a few releases and remove it

   sometime thereafter.

This patch implements phase 1 of this plan, introducing a new language

extension to control whether CUSKs are enabled. When top-level kind

signatures are implemented, we can transition to phase 2.

</pre>

</li>

</ul>

<h4>8 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#11e9bfd841c4163c1919b5e07efc84740e02010f">

compiler/main/DynFlags.hs

</a>

</li>

<li class="file-stats">

<a href="#bdfa0cc139f61d1236abc1598c5d684b43c357f9">

compiler/typecheck/TcTyClsDecls.hs

</a>

</li>

<li class="file-stats">

<a href="#40d93f06cdb95d1c98a6b3832d0153e59839d832">

docs/users_guide/glasgow_exts.rst

</a>

</li>

<li class="file-stats">

<a href="#3f7d85c388596f9ef50f1a3e0334bdb67007e969">

libraries/ghc-boot-th/GHC/LanguageExtensions/Type.hs

</a>

</li>

<li class="file-stats">

<a href="#9f7a74d3512ab004425ec39cbbcb9737e2ecaa82">

testsuite/tests/driver/T4437.hs

</a>

</li>

<li class="file-stats">

<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">

testsuite/tests/typecheck/should_fail/all.T

</a>

</li>

<li class="file-stats">

<a href="#68ccda913b309d695da33c208dd8f997ab9f2ca5">

<span class="new-file">

+

testsuite/tests/typecheck/should_fail/tcfail225.hs

</span>

</a>

</li>

<li class="file-stats">

<a href="#162797a4244a7913f00cfca9682347a25da676fd">

<span class="new-file">

+

testsuite/tests/typecheck/should_fail/tcfail225.stderr

</span>

</a>

</li>

</ul>

<h4>Changes:</h4>

<li id="11e9bfd841c4163c1919b5e07efc84740e02010f">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/9a207a88df92c6c84c17f88d96a264fb3fd3e60f#11e9bfd841c4163c1919b5e07efc84740e02010f"><strong>compiler/main/DynFlags.hs</strong></a>

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<table class="code white" style="font-family: monospace; font-size: 90%;" bgcolor="#fff" width="100%" cellpadding="0" cellspacing="0">

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

<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2260" style="width: 35px; color: rgba(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="2260" style="width: 35px; color: rgba(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">@@ -2260,6 +2260,7 @@ languageExtensions (Just Haskell98)</td>

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<td class="diff-line-num old_line" data-linenumber="2260" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

2260

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<td class="diff-line-num new_line" data-linenumber="2260" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

<pre style="margin: 0;"> <span id="LC2260" class="line" lang="haskell">    <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ImplicitPrelude</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2261" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="2261" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

<pre style="margin: 0;"> <span id="LC2261" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [When is StarIsType enabled]</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2262" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="2262" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

<pre style="margin: 0;"> <span id="LC2262" class="line" lang="haskell">       <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">StarIsType</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="2263" style="width: 35px; color: rgba(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="2263" style="width: 35px; color: rgba(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="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC2263" class="line" lang="haskell">       <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CUSKs</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2263" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="2264" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

<pre style="margin: 0;"> <span id="LC2264" class="line" lang="haskell">       <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">MonomorphismRestriction</span><span class="p">,</span></span>

</pre>

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

<td class="diff-line-num old_line" data-linenumber="2264" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="2265" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

<pre style="margin: 0;"> <span id="LC2265" class="line" lang="haskell">       <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">NPlusKPatterns</span><span class="p">,</span></span>

</pre>

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

<td class="diff-line-num old_line" data-linenumber="2265" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="2266" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

<pre style="margin: 0;"> <span id="LC2266" class="line" lang="haskell">       <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">DatatypeContexts</span><span class="p">,</span></span>

</pre>

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

<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2276" style="width: 35px; color: rgba(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="2277" style="width: 35px; color: rgba(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">@@ -2276,6 +2277,7 @@ languageExtensions (Just Haskell2010)</td>

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<td class="diff-line-num old_line" data-linenumber="2276" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="2277" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

<pre style="margin: 0;"> <span id="LC2277" class="line" lang="haskell">    <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ImplicitPrelude</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2277" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="2278" style="width: 35px; color: rgba(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="LC2278" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [When is StarIsType enabled]</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2278" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="2279" style="width: 35px; color: rgba(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="LC2279" class="line" lang="haskell">       <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">StarIsType</span><span class="p">,</span></span>

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<td class="diff-line-num new old_line" data-linenumber="2279" style="width: 35px; color: rgba(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="2280" style="width: 35px; color: rgba(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="LC2280" class="line" lang="haskell">       <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CUSKs</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="2281" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

<pre style="margin: 0;"> <span id="LC2281" class="line" lang="haskell">       <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">MonomorphismRestriction</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2280" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="2282" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

2282

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

<pre style="margin: 0;"> <span id="LC2282" class="line" lang="haskell">       <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">DatatypeContexts</span><span class="p">,</span></span>

</pre>

</td>

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2281

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2283

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<pre style="margin: 0;"> <span id="LC2283" class="line" lang="haskell">       <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TraditionalRecordSyntax</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="4358" style="width: 35px; color: rgba(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="4360" style="width: 35px; color: rgba(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">@@ -4358,6 +4360,7 @@ xFlagsDeps = [</td>

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4360

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<pre style="margin: 0;"> <span id="LC4360" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"BinaryLiterals"</span>                   <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">BinaryLiterals</span><span class="p">,</span></span>

</pre>

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4361

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<pre style="margin: 0;"> <span id="LC4361" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"CApiFFI"</span>                          <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CApiFFI</span><span class="p">,</span></span>

</pre>

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4360

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<td class="diff-line-num new_line" data-linenumber="4362" style="width: 35px; color: rgba(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="LC4362" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"CPP"</span>                              <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Cpp</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="4361" style="width: 35px; color: rgba(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="4363" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

4363

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<pre style="margin: 0;">+<span id="LC4363" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"CUSKs"</span>                            <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CUSKs</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="4364" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

4364

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<pre style="margin: 0;"> <span id="LC4364" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"ConstrainedClassMethods"</span>          <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ConstrainedClassMethods</span><span class="p">,</span></span>

</pre>

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4362

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<td class="diff-line-num new_line" data-linenumber="4365" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

4365

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<pre style="margin: 0;"> <span id="LC4365" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"ConstraintKinds"</span>                  <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ConstraintKinds</span><span class="p">,</span></span>

</pre>

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4366

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<pre style="margin: 0;"> <span id="LC4366" class="line" lang="haskell">  <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"DataKinds"</span>                        <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">DataKinds</span><span class="p">,</span></span>

</pre>

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<br>

</li>

<li id="bdfa0cc139f61d1236abc1598c5d684b43c357f9">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/9a207a88df92c6c84c17f88d96a264fb3fd3e60f#bdfa0cc139f61d1236abc1598c5d684b43c357f9"><strong>compiler/typecheck/TcTyClsDecls.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="510" style="width: 35px; color: rgba(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="510" style="width: 35px; color: rgba(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">@@ -510,8 +510,9 @@ kcTyClGroup decls</td>

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510

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510

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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">--    3. Generalise the inferred kinds</span></span>

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<pre style="margin: 0;"> <span id="LC511" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- See Note [Kind checking for type and class decls]</span></span>

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<pre style="margin: 0;"> <span id="LC512" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">cusks</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CUSKs</span></span>

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<pre style="margin: 0;"> <span id="LC514" class="line" lang="haskell">        <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">cusk_decls</span><span class="p">,</span> <span class="n" style="color: #333;">no_cusk_decls</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC514" class="line" lang="haskell">                 <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">hsDeclHasCusk</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">unLoc</span></span><span class="p">)</span> <span class="n" style="color: #333;">decls</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC515" class="line" lang="haskell">                 <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">\</span></span><span class="n" style="color: #333;"><span class="idiff">d</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">cusks</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">hsDeclHasCusk</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">d</span></span><span class="p"><span class="idiff right">)</span>)</span> <span class="n" style="color: #333;">decls</span></span>

</pre>

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515

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516

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<pre style="margin: 0;"> <span id="LC516" class="line" lang="haskell"></span>

</pre>

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516

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517

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<pre style="margin: 0;"> <span id="LC517" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">poly_cusk_tcs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInitialKinds</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">cusk_decls</span></span>

</pre>

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517

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<td class="diff-line-num new_line" data-linenumber="518" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

518

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<pre style="margin: 0;"> <span id="LC518" class="line" lang="haskell"></span>

</pre>

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<br>

</li>

<li id="40d93f06cdb95d1c98a6b3832d0153e59839d832">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/9a207a88df92c6c84c17f88d96a264fb3fd3e60f#40d93f06cdb95d1c98a6b3832d0153e59839d832"><strong>docs/users_guide/glasgow_exts.rst</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="9012" style="width: 35px; color: rgba(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="9012" style="width: 35px; color: rgba(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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9012

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<pre style="margin: 0;"> <span id="LC9012" class="line" lang="mosel"><span class="s2" style="color: #d14;">Complete user-supplied kind signatures and polymorphic recursion</span></span>

</pre>

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9013

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9013

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<pre style="margin: 0;"> <span id="LC9013" class="line" lang="mosel"><span class="s2" style="color: #d14;">----------------------------------------------------------------</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="9014" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

9014

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9014

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<pre style="margin: 0;"> <span id="LC9014" class="line" lang="mosel"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="9015" style="width: 35px; color: rgba(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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9015

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<pre style="margin: 0;">+<span id="LC9015" class="line" lang="mosel"><span class="s2" style="color: #d14;">.. extension:: CUSKs</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="9016" style="width: 35px; color: rgba(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="LC9016" class="line" lang="mosel"><span class="s2" style="color: #d14;">    :shortdesc: Enable detection of complete user-supplied kind signatures.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="9017" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

9017

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<pre style="margin: 0;">+<span id="LC9017" class="line" lang="mosel"></span>

</pre>

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9015

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<td class="diff-line-num new_line" data-linenumber="9018" style="width: 35px; color: rgba(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="LC9018" class="line" lang="mosel"><span class="s2" style="color: #d14;">Just as in type inference, kind inference for recursive types can only</span></span>

</pre>

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9016

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<td class="diff-line-num new_line" data-linenumber="9019" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

9019

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<pre style="margin: 0;"> <span id="LC9019" class="line" lang="mosel"><span class="s2" style="color: #d14;">use *monomorphic* recursion. Consider this (contrived) example: ::</span></span>

</pre>

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9017

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<td class="diff-line-num new_line" data-linenumber="9020" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

9020

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<pre style="margin: 0;"> <span id="LC9020" class="line" lang="mosel"></span>

</pre>

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<li id="3f7d85c388596f9ef50f1a3e0334bdb67007e969">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/9a207a88df92c6c84c17f88d96a264fb3fd3e60f#3f7d85c388596f9ef50f1a3e0334bdb67007e969"><strong>libraries/ghc-boot-th/GHC/LanguageExtensions/Type.hs</strong></a>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="140" style="width: 35px; color: rgba(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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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell">   <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">QuantifiedConstraints</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell">   <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">StarIsType</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell">   <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ImportQualifiedPost</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell">   <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CUSKs</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell">   <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Enum</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Generic</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bounded</span><span class="p">)</span></span></pre>

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<br>

</li>

<li id="9f7a74d3512ab004425ec39cbbcb9737e2ecaa82">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/9a207a88df92c6c84c17f88d96a264fb3fd3e60f#9f7a74d3512ab004425ec39cbbcb9737e2ecaa82"><strong>testsuite/tests/driver/T4437.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -41,6 +41,7 @@ expectedGhcOnlyExtensions = ["RelaxedLayout",</td>

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41

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41

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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell">                             <span class="s" style="color: #d14;">"AlternativeLayoutRuleTransitional"</span><span class="p">,</span></span>

</pre>

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42

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42

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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell">                             <span class="s" style="color: #d14;">"EmptyDataDeriving"</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="43" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

43

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43

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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell">                             <span class="s" style="color: #d14;">"GeneralisedNewtypeDeriving"</span><span class="p">,</span></span>

</pre>

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44

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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell">                             <span class="s" style="color: #d14;">"CUSKs"</span><span class="p">,</span></span>

</pre>

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44

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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell">                             <span class="s" style="color: #d14;">"ImportQualifiedPost"</span><span class="p">]</span></span>

</pre>

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45

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<td class="diff-line-num new_line" data-linenumber="46" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

46

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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"></span>

</pre>

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46

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<td class="diff-line-num new_line" data-linenumber="47" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

47

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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="n" style="color: #333;">expectedCabalOnlyExtensions</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">String</span><span class="p">]</span></span>

</pre>

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<br>

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<li id="b9e86d897a62509b0114d81d5e736630d6f68f43">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/9a207a88df92c6c84c17f88d96a264fb3fd3e60f#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="241" style="width: 35px; color: rgba(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="241" style="width: 35px; color: rgba(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">@@ -241,6 +241,7 @@ test('tcfail217', normal, compile_fail, [''])</td>

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<pre style="margin: 0;"> <span id="LC241" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'tcfail218'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC242" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'tcfail223'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="243" style="width: 35px; color: rgba(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="LC243" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'tcfail224'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC244" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'tcfail225'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="245" style="width: 35px; color: rgba(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="LC245" class="line" lang="perl"></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="246" style="width: 35px; color: rgba(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="LC246" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'SilentParametersOverlapping'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="247" style="width: 35px; color: rgba(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="LC247" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'FailDueToGivenOverlapping'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>

</pre>

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<br>

</li>

<li id="68ccda913b309d695da33c208dd8f997ab9f2ca5">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/9a207a88df92c6c84c17f88d96a264fb3fd3e60f#68ccda913b309d695da33c208dd8f997ab9f2ca5"><strong>testsuite/tests/typecheck/should_fail/tcfail225.hs</strong></a>

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

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

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">TcFail225</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>

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7

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="p">(</span><span class="n" style="color: #333;">m</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 class="p">)</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 class="kr" style="font-weight: 600;">where</span></span>

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9

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">m</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;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="n" style="color: #333;">m</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;">T</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">a</span></span></pre>

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<a href="https://gitlab.haskell.org/ghc/ghc/commit/9a207a88df92c6c84c17f88d96a264fb3fd3e60f#162797a4244a7913f00cfca9682347a25da676fd"><strong>testsuite/tests/typecheck/should_fail/tcfail225.stderr</strong></a>

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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">tcfail225.hs:9:19: error:</span>

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Expected kind ‘k -> *’, but ‘Maybe’ has kind ‘* -> *’</span>

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">    • In the first argument of ‘T’, namely ‘Maybe’</span>

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">      In the type ‘T Maybe (m a)’</span>

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">      In the definition of data constructor ‘MkT’</span></pre>

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