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<h3>
Ben Gamari pushed to branch wip/runRW
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/7d1b4767b2f88d71ec8140aa9dab5f816fafc09c">7d1b4767</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-21T21:27:03+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CoreLint: Again accept casts
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/179d0bbeaf9a0c64c897df9a3af6e0be93a63e91">179d0bbe</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-21T23:17:48+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Lint check return type of a join point
Consider
join x = rhs in body
It's important that the type of 'rhs' is the same as the type of
'body', but Lint wasn't checking that invariant.
Now it does! This was exposed by investigation into !3113.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54fc0e73abaffd9d9b943e0d93fcfb5addbbb2c9">54fc0e73</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-21T23:17:49+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not float join points in exprIsConApp_maybe
We hvae been making exprIsConApp_maybe cleverer in recent times:
commit b78cc64e923716ac0512c299f42d4d0012306c05
Date: Thu Nov 15 17:14:31 2018 +0100
Make constructor wrappers inline only during the final phase
commit 7833cf407d1f608bebb1d38bb99d3035d8d735e6
Date: Thu Jan 24 17:58:50 2019 +0100
Look through newtype wrappers (Trac #16254)
commit c25b135ff5b9c69a90df0ccf51b04952c2dc6ee1
Date: Thu Feb 21 12:03:22 2019 +0000
Fix exprIsConApp_maybe
But alas there was still a bug, now immortalised in
Note [Don't float join points]
in SimpleOpt.
It's quite hard to trigger because it requires a dead
join point, but it came up when compiling Cabal
Cabal.Distribution.Fields.Lexer.hs, when working on
!3113.
Happily, the fix is extremly easy. Finding the
bug was not so easy.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/be9bb0d781124f7616e6a0fbb0b4462d4277efb3">be9bb0d7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-23T13:48:34+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge commit 'fad536ea7e2622fb1102df55bd642b4153603503' into HEAD
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6965215a5b3b4982af4321a2714d11756a688325">6965215a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-24T00:46:31+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CoreLint: Accept oversaturated applications of runRW#
</pre>
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<h4>1 changed file:</h4>
<ul>
<li class="file-stats">
<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
</a>
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<h4>Changes:</h4>
<li id="36a42448a83a9d1f6df8475f03ead2eed199dd8e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fad536ea7e2622fb1102df55bd642b4153603503...6965215a5b3b4982af4321a2714d11756a688325#36a42448a83a9d1f6df8475f03ead2eed199dd8e"><strong>compiler/GHC/Core/Lint.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -780,10 +780,9 @@ type LintedId = Id</td>
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"><span class="cd">-- | Lint an expression cast through the given coercion, returning the type</span></span>
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- resulting from the cast.</span></span>
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<pre style="margin: 0;">-<span id="LC783" class="line" lang="haskell"><span class="n" style="color: #333;">lintCastExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="kt" style="color: #458; font-weight: 600;">LintedType</span></span>
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<pre style="margin: 0;">-<span id="LC784" class="line" lang="haskell"><span class="n" style="color: #333;">lintCastExpr</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">-<span id="LC785" 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;">expr_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">markAllJoinsBad</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lintCoreExpr</span> <span class="n" style="color: #333;">expr</span></span>
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786
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<pre style="margin: 0;">-<span id="LC786" class="line" lang="haskell"> <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="LC783" class="line" lang="haskell"><span class="n" style="color: #333;">lintCastExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintedType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="kt" style="color: #458; font-weight: 600;">LintedType</span></span>
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"><span class="n" style="color: #333;">lintCastExpr</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">expr_ty</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC785" 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="LC786" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">from_ty</span> <span class="n" style="color: #333;">to_ty</span><span class="p">,</span> <span class="n" style="color: #333;">role</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKindRole</span> <span class="n" style="color: #333;">co'</span></span>
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkValueType</span> <span class="n" style="color: #333;">to_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"target of cast"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co'</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -808,7 +807,8 @@ lintCoreExpr (Lit lit)</td>
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<pre style="margin: 0;"> <span id="LC807" 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="n" style="color: #333;">literalType</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC809" class="line" lang="haskell"><span class="n" style="color: #333;">lintCoreExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC811" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">markAllJoinsBad</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lintCastExpr</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">expr_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">markAllJoinsBad</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lintCoreExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC811" class="line" lang="haskell"> <span class="n" style="color: #333;">lintCastExpr</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">expr_ty</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC813" class="line" lang="haskell"><span class="n" style="color: #333;">lintCoreExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="n" style="color: #333;">tickish</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tickish</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -870,11 +870,22 @@ lintCoreExpr e@(Let (Rec pairs) body)</td>
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"><span class="n" style="color: #333;">lintCoreExpr</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fun</span></span>
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fun</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">runRWKey</span></span>
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">arg_ty1</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty2</span><span class="p">,</span> <span class="n" style="color: #333;">arg3</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- N.B. we may have an over-saturated application of the form:</span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- runRW (\s -> \x -> ...) y</span></span>
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">arg_ty1</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">arg_ty2</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">arg3</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC876" 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;">fun_ty1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCoreArg</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="n" style="color: #333;">arg_ty1</span></span>
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<pre style="margin: 0;"> <span id="LC877" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">fun_ty2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCoreArg</span> <span class="n" style="color: #333;">fun_ty1</span> <span class="n" style="color: #333;">arg_ty2</span></span>
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg3_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintJoinLams</span> <span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="n" style="color: #333;">arg3</span></span>
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintValApp</span> <span class="n" style="color: #333;">arg3</span> <span class="n" style="color: #333;">fun_ty2</span> <span class="n" style="color: #333;">arg3_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The simplifier pushes casts out of the continuation lambda;</span></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- consequently we need to handle the case that the continuation is a</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- cast lambda. See Note [Casts and lambdas] in</span></span>
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Core.Opt.Simplify.Utils.</span></span>
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg3_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">arg3</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"> <span class="n" style="color: #333;">expr_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintJoinLams</span> <span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"> <span class="n" style="color: #333;">lintCastExpr</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">expr_ty</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">lintJoinLams</span> <span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="n" style="color: #333;">arg3</span></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">app_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintValApp</span> <span class="n" style="color: #333;">arg3</span> <span class="n" style="color: #333;">fun_ty2</span> <span class="n" style="color: #333;">arg3_ty</span></span>
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lintCoreArgs</span> <span class="n" style="color: #333;">app_ty</span> <span class="n" style="color: #333;">rest</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC889" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC890" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fun</span></span>
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<pre style="margin: 0;"> <span id="LC891" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fun</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">runRWKey</span></span>
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