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<h3>
Sebastian Graf pushed to branch wip/T17932
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>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/aa89fe2dec16e68b77dc13574a503a00c589fe5c">aa89fe2d</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-03-20T12:38:58Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Demand analysis: simplify the demand for a RHS
Ticket #17932 showed that we were using a stupid demand for the RHS
of a let-binding, when the result is a product. This was the result
of a "fix" in 2013, which (happily) turns out to no longer be
necessary.
So I just deleted the code, which simplifies the demand analyser,
and fixes #17932.
I tried nofib, and got 0.0% perf changes.
All this came up when messing about with !2873 (ticket #17917),
but is idependent of it.
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<h4>4 changed files:</h4>
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<a href="#1419e35d2402c23209a644b054c5a67aa4463451">
compiler/GHC/Core/Op/DmdAnal.hs
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<a href="#444edc0c622aa5b8bd37343b78ce9eb2872e9eab">
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+
testsuite/tests/stranal/sigs/T17932.hs
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<li class="file-stats">
<a href="#22ebfab2bf433a77b3084d8494846eb541375184">
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testsuite/tests/stranal/sigs/T17932.stderr
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<li class="file-stats">
<a href="#6cd3b38f9f19c00c9fb48ff8a444f1534e54ad95">
testsuite/tests/stranal/sigs/all.T
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<h4>Changes:</h4>
<li id="1419e35d2402c23209a644b054c5a67aa4463451">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/aa89fe2dec16e68b77dc13574a503a00c589fe5c#1419e35d2402c23209a644b054c5a67aa4463451"><strong>compiler/GHC/Core/Op/DmdAnal.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">@@ -617,16 +617,11 @@ dmdAnalRhsLetDown rec_flag env let_dmd id rhs</td>
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<pre style="margin: 0;"> <span id="LC617" class="line" lang="haskell"> <span class="n" style="color: #333;">is_thunk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">exprIsHNF</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC618" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"><span class="cd">-- | @mkRhsDmd env rhs_arity rhs@ creates a 'CleanDemand' for</span></span>
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<pre style="margin: 0;">-<span id="LC620" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unleashing on the given function's @rhs@, by creating a call demand of</span></span>
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @rhs_arity@ with a body demand appropriate for possible product types.</span></span>
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<pre style="margin: 0;">-<span id="LC622" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Product demands for function body].</span></span>
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<pre style="margin: 0;">-<span id="LC623" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For example, a call of the form @mkRhsDmd _ 2 (\x y -> (x, y))@ returns a</span></span>
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<pre style="margin: 0;">-<span id="LC624" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- clean usage demand of @C1(C1(U(U,U)))@.</span></span>
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unleashing on the given function's @rhs@, by creating</span></span>
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a call demand of @rhs_arity@</span></span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Historical Note [Product demands for function body]</span></span>
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="haskell"><span class="n" style="color: #333;">mkRhsDmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AnalEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</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;">CleanDemand</span></span>
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<pre style="margin: 0;">-<span id="LC626" class="line" lang="haskell"><span class="n" style="color: #333;">mkRhsDmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC627" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">peelTsFuns</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="p">(</span><span class="n" style="color: #333;">findTypeShape</span> <span class="p">(</span><span class="n" style="color: #333;">ae_fam_envs</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">rhs</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC628" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TsProd</span> <span class="n" style="color: #333;">tss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkCallDmds</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="p">(</span><span class="n" style="color: #333;">cleanEvalProdDmd</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">tss</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC629" 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;">mkCallDmds</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">cleanEvalDmd</span></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"><span class="n" style="color: #333;">mkRhsDmd</span> <span class="n" style="color: #333;">_env</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCallDmds</span> <span class="n" style="color: #333;">rhs_arity</span> <span class="n" style="color: #333;">cleanEvalDmd</span></span>
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<pre style="margin: 0;"> <span id="LC625" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="haskell"><span class="cd">-- | If given the let-bound 'Id', 'useLetUp' determines whether we should</span></span>
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- process the binding up (body before rhs) or down (rhs before body).</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">@@ -857,9 +852,9 @@ forward plusInt's demand signature, and all is well (see Note [Newtype arity] in</td>
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.Arity)! A small example is the test case NewtypeArity.</span></span>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Product demands for function body]</span></span>
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<pre style="margin: 0;">-<span id="LC861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">This example comes from</span> shootout/binary_trees:</span></span>
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Historical </span>Note [Product demands for function body]</span></span>
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<span class="idiff left right">~~~~~~~~~~~</span></span></span>
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">In 2013 I spotted this example, in</span> shootout/binary_trees:</span></span>
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Main.check' = \ b z ds. case z of z' { I# ip -></span></span>
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case ds_d13s 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">@@ -878,8 +873,12 @@ Here we *really* want to unbox z, even though it appears to be used boxed in</td>
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<pre style="margin: 0;"> <span id="LC873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the Nil case. Partly the Nil case is not a hot path. But more specifically,</span></span>
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the whole function gets the CPR property if we do.</span></span>
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So for the demand on the body of a RHS we use a product demand if it's</span></span>
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<pre style="margin: 0;">-<span id="LC882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a product type.</span></span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That motivated using a demand of C(C(C(S(L,L)))) for the RHS, where</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(solely because the result was a product) we used a product demand</span></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(albeit with lazy components) for the body. But that gives very silly</span></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">behaviour -- see #17932. Happily it turns out now to be entirely</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unnecessary: we get good results with C(C(C(S))). So I simply</span></span>
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">deleted the special case.</span></span>
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC884" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/aa89fe2dec16e68b77dc13574a503a00c589fe5c#444edc0c622aa5b8bd37343b78ce9eb2872e9eab"><strong>testsuite/tests/stranal/sigs/T17932.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See commentary in #17932</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T17932</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">flags</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Options</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reverse</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">x</span><span class="p">)))))))</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">seq</span><span class="p">`</span> <span class="n" style="color: #333;">f</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">X</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">X</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Options</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Options</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">X</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">]</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/aa89fe2dec16e68b77dc13574a503a00c589fe5c#22ebfab2bf433a77b3084d8494846eb541375184"><strong>testsuite/tests/stranal/sigs/T17932.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">==================== Strictness signatures ====================</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">T17932.$tc'Options:</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">T17932.$tc'X:</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">T17932.$tcOptions:</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T17932.$tcX:</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">T17932.$trModule:</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">T17932.flags: <S(SS),1*U(1*U,1*U)></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">==================== Cpr signatures ====================</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">T17932.$tc'Options: m1</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">T17932.$tc'X: m1</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext">T17932.$tcOptions: m1</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext">T17932.$tcX: m1</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext">T17932.$trModule: m1</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">T17932.flags: m1</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext">==================== Strictness signatures ====================</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext">T17932.$tc'Options:</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext">T17932.$tc'X:</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">T17932.$tcOptions:</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext">T17932.$tcX:</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext">T17932.$trModule:</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext">T17932.flags: <S(SS),1*U(1*U,1*U)></span>
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<li id="6cd3b38f9f19c00c9fb48ff8a444f1534e54ad95">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/aa89fe2dec16e68b77dc13574a503a00c589fe5c#6cd3b38f9f19c00c9fb48ff8a444f1534e54ad95"><strong>testsuite/tests/stranal/sigs/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -19,3 +19,4 @@ test('T12370', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">CaseBinderCPR</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">NewtypeArity</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T5075</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17932</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></pre>
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