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<h3>
Ben Gamari pushed to branch wip/keepAlive-optionB
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/479ac9995f9061878767a27116b7bf9cfa172825">479ac999</a></strong>
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<span>by GHC GitLab CI</span>
<i>at 2020-09-11T11:12:50+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Lint
</pre>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcc48ecdcd4cd01d289593f0831e8db8ebdb697c">dcc48ecd</a></strong>
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<span>by GHC GitLab CI</span>
<i>at 2020-09-11T11:22:24+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify
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<h4>2 changed files:</h4>
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<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<a href="#f168a93cde5e2aec2441d6331dfe500172df4af3">
compiler/GHC/Core/Opt/Simplify.hs
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<h4>Changes:</h4>
<li id="36a42448a83a9d1f6df8475f03ead2eed199dd8e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ecbbfe8a5516989b57c11356b32ab91aa9b49ddb...dcc48ecdcd4cd01d289593f0831e8db8ebdb697c#36a42448a83a9d1f6df8475f03ead2eed199dd8e"><strong>compiler/GHC/Core/Lint.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -33,6 +33,7 @@ import GHC.Core.Opt.Monad</td>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Literal</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.PrimOps</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">PrimOp</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KeepAliveOp</span><span class="p">)</span> <span class="p">)</span></span>
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36
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Types.Prim</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Types</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">multiplicityTy</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">isFloatingTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTyFamFree</span> <span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="910" style="width: 35px; color: rgba(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="911" style="width: 35px; color: rgba(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">@@ -910,17 +911,33 @@ lintCoreExpr e@(Let (Rec pairs) body)</td>
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910
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911
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<pre style="margin: 0;"> <span id="LC911" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">pairs</span></span>
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911
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912
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<pre style="margin: 0;"> <span id="LC912" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC913" 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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913
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<pre style="margin: 0;">-<span id="LC913" 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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914
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<pre style="margin: 0;">-<span id="LC914" 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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914
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Special linting for keepAlive#</span></span>
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<pre style="margin: 0;">+<span id="LC915" 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_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fun</span></span>
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<td class="diff-line-num new new_line" data-linenumber="916" 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="LC916" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">KeepAliveOp</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isPrimOpId_maybe</span> <span class="n" style="color: #333;">fun_id</span></span>
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<pre style="margin: 0;">+<span id="LC917" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">arg_rep</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">arg_ty</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">k_rep</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">k_ty</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">s</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="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="LC918" 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="p">(</span><span class="n" style="color: #333;">fun_ty1</span><span class="p">,</span> <span class="n" style="color: #333;">ue1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCoreArgs</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">fun_id</span><span class="p">,</span> <span class="n" style="color: #333;">zeroUE</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">arg_rep</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">k_rep</span><span class="p">,</span> <span class="n" style="color: #333;">k_ty</span><span class="p">,</span> <span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="n" style="color: #333;">s</span><span class="p">]</span></span>
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919
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Linting of runRW#]</span></span>
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920
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreArg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LintedType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UsageEnv</span><span class="p">)</span></span>
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921
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<pre style="margin: 0;">+<span id="LC921" class="line" lang="haskell"> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">expr</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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922
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"> <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_id</span><span class="p">)</span> <span class="n" style="color: #333;">expr</span></span>
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923
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="haskell"> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">other</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;">other</span></span>
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924
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<pre style="margin: 0;">+<span id="LC924" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Look through ticks?</span></span>
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925
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<pre style="margin: 0;">+<span id="LC925" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">arg2_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ue2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">k</span></span>
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926
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<pre style="margin: 0;">+<span id="LC926" 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;">k</span> <span class="n" style="color: #333;">fun_ty1</span> <span class="n" style="color: #333;">arg2_ty</span> <span class="n" style="color: #333;">ue1</span> <span class="n" style="color: #333;">ue2</span></span>
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927
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<pre style="margin: 0;">+<span id="LC927" 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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928
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<pre style="margin: 0;">+<span id="LC928" class="line" lang="haskell"></span>
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929
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<pre style="margin: 0;">+<span id="LC929" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Special linting for runRW#</span></span>
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930
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<pre style="margin: 0;">+<span id="LC930" 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_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fun</span></span>
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931
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<pre style="margin: 0;">+<span id="LC931" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fun_id</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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915
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932
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<pre style="margin: 0;"> <span id="LC932" 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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916
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933
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<pre style="margin: 0;"> <span id="LC933" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- runRW (\s -> \x -> ...) y</span></span>
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917
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934
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<pre style="margin: 0;"> <span id="LC934" 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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918
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<pre style="margin: 0;">-<span id="LC918" 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_pair1</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;">zeroUE</span><span class="p">)</span> <span class="n" style="color: #333;">arg_ty1</span></span>
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935
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<pre style="margin: 0;">+<span id="LC935" 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_pair1</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 class="idiff left right">_id</span></span><span class="p">,</span> <span class="n" style="color: #333;">zeroUE</span><span class="p">)</span> <span class="n" style="color: #333;">arg_ty1</span></span>
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919
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936
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<pre style="margin: 0;"> <span id="LC936" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">fun_ty2</span><span class="p">,</span> <span class="n" style="color: #333;">ue2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintCoreArg</span> <span class="n" style="color: #333;">fun_pair1</span> <span class="n" style="color: #333;">arg_ty2</span></span>
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920
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937
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<pre style="margin: 0;"> <span id="LC937" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Linting of runRW#]</span></span>
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921
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938
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<pre style="margin: 0;"> <span id="LC938" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreArg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LintedType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UsageEnv</span><span class="p">)</span></span>
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922
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939
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<pre style="margin: 0;"> <span id="LC939" class="line" lang="haskell"> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">expr</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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923
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<pre style="margin: 0;">-<span id="LC923" class="line" lang="haskell"> <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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940
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"> <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 class="idiff left right">_id</span></span><span class="p">)</span> <span class="n" style="color: #333;">expr</span></span>
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924
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941
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<pre style="margin: 0;"> <span id="LC941" class="line" lang="haskell"> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">other</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;">other</span></span>
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925
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942
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<pre style="margin: 0;"> <span id="LC942" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Look through ticks?</span></span>
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926
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943
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<pre style="margin: 0;"> <span id="LC943" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">arg3_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ue3</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lintRunRWCont</span> <span class="n" style="color: #333;">arg3</span></span>
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<li id="f168a93cde5e2aec2441d6331dfe500172df4af3">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ecbbfe8a5516989b57c11356b32ab91aa9b49ddb...dcc48ecdcd4cd01d289593f0831e8db8ebdb697c#f168a93cde5e2aec2441d6331dfe500172df4af3"><strong>compiler/GHC/Core/Opt/Simplify.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">@@ -2069,7 +2069,6 @@ rebuildContOpCall</td>
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2069
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2069
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<pre style="margin: 0;"> <span id="LC2069" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyArg</span> <span class="p">{</span><span class="n" style="color: #333;">as_arg_ty</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">arg_ty</span><span class="p">}</span></span>
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2070
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2070
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<pre style="margin: 0;"> <span id="LC2070" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyArg</span> <span class="p">{</span><span class="n" style="color: #333;">as_arg_ty</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">arg_rep</span><span class="p">}</span></span>
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2071
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2071
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<pre style="margin: 0;"> <span id="LC2071" class="line" lang="haskell"> <span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rev_args</span></span>
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2072
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<pre style="margin: 0;">-<span id="LC2072" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2073
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2072
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<pre style="margin: 0;"> <span id="LC2072" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span></span>
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2074
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2073
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<pre style="margin: 0;"> <span id="LC2073" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">--let (m,_,_) = splitFunTy fun_ty</span></span>
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2075
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2074
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<pre style="margin: 0;"> <span id="LC2074" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span></span>
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