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<h3>
Andreas Klebinger pushed to branch wip/andreask/rec_tyCon_opt
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74bf38c234e98ec6dd289ce662c44b10e53aa352">74bf38c2</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-06-15T13:16:03+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">checkRecTc: Use UniqFM instead of NameEnv.
The unique of a TyCon is the same as it's name.
So we can simply use the tyCons unique directly
instead of taking a indirection via the name.
Saves one indirection when getting the unique.
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<h4>1 changed file:</h4>
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compiler/GHC/Core/TyCon.hs
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<h4>Changes:</h4>
<li id="4aad0050db1a8a20db8bbca149111de99cb299c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74bf38c234e98ec6dd289ce662c44b10e53aa352#4aad0050db1a8a20db8bbca149111de99cb299c9"><strong>compiler/GHC/Core/TyCon.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">@@ -167,6 +167,7 @@ import GHC.Settings.Constants</td>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique</span><span class="p">(</span> <span class="n" style="color: #333;">tyConRepNameUnique</span><span class="p">,</span> <span class="n" style="color: #333;">dataConTyRepNameUnique</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Set</span></span>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.FM</span></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Unit.Module</span></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Data</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Data</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">@@ -2746,13 +2747,16 @@ good to be able to unwrap multiple layers.</td>
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<pre style="margin: 0;"> <span id="LC2747" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The function that manages all this is checkRecTc.</span></span>
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<pre style="margin: 0;"> <span id="LC2748" 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="LC2749" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2749" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NameEnv</span></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2750" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">UniqFM</span></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2751" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The upper bound, and the number of times</span></span>
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<pre style="margin: 0;"> <span id="LC2752" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we have encountered each TyCon</span></span>
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<pre style="margin: 0;">+<span id="LC2753" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We use UniqFM since:</span></span>
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<pre style="margin: 0;">+<span id="LC2754" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Conveniently tyCons already have uniques to identenfy them</span></span>
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<pre style="margin: 0;">+<span id="LC2755" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Insertion order does not matter for this use case</span></span>
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<pre style="margin: 0;"> <span id="LC2756" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2757" class="line" lang="haskell"><span class="cd">-- | Initialise a 'RecTcChecker' with 'defaultRecTcMaxBound'.</span></span>
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2758
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<pre style="margin: 0;"> <span id="LC2758" class="line" lang="haskell"><span class="n" style="color: #333;">initRecTc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span></span>
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2755
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<pre style="margin: 0;">-<span id="LC2755" class="line" lang="haskell"><span class="n" style="color: #333;">initRecTc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">defaultRecTcMaxBound</span> <span class="n" style="color: #333;">empty<span class="idiff left right">NameEnv</span></span></span>
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2759
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<pre style="margin: 0;">+<span id="LC2759" class="line" lang="haskell"><span class="n" style="color: #333;">initRecTc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">defaultRecTcMaxBound</span> <span class="n" style="color: #333;">empty<span class="idiff left right">UFM</span></span></span>
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2756
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2760
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<pre style="margin: 0;"> <span id="LC2760" class="line" lang="haskell"></span>
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2757
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2761
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<pre style="margin: 0;"> <span id="LC2761" class="line" lang="haskell"><span class="cd">-- | The default upper bound (100) for the number of times a 'RecTcChecker' is</span></span>
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2758
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2762
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<pre style="margin: 0;"> <span id="LC2762" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- allowed to encounter each 'TyCon'.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2769" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2769,12 +2773,15 @@ checkRecTc :: RecTcChecker -> TyCon -> Maybe RecTcChecker</td>
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2769
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2773
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<pre style="margin: 0;"> <span id="LC2773" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Nothing => Recursion detected</span></span>
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2770
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2774
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<pre style="margin: 0;"> <span id="LC2774" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Just rec_tcs => Keep going</span></span>
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2771
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2775
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<pre style="margin: 0;"> <span id="LC2775" class="line" lang="haskell"><span class="n" style="color: #333;">checkRecTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">bound</span> <span class="n" style="color: #333;">rec_nts</span><span class="p">)</span> <span class="n" style="color: #333;">tc</span></span>
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2772
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<pre style="margin: 0;">-<span id="LC2772" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupNameEnv</span> <span class="n" style="color: #333;">rec_nts</span> <span class="n" style="color: #333;">tc_name</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2776
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<pre style="margin: 0;">+<span id="LC2776" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTupleTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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2777
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<pre style="margin: 0;">+<span id="LC2777" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">bound</span> <span class="n" style="color: #333;">rec_nts</span><span class="p">)</span></span>
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2778
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<pre style="margin: 0;">+<span id="LC2778" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2779
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<pre style="margin: 0;">+<span id="LC2779" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupUFM</span> <span class="n" style="color: #333;">rec_nts</span> <span class="n" style="color: #333;">tc_unique</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2773
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2780
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<pre style="margin: 0;"> <span id="LC2780" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">bound</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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2774
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<td class="diff-line-num new_line old" data-linenumber="2781" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2774" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">bound</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">extendNameEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rec_nts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc_name</span></span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)))</span></span>
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2775
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<pre style="margin: 0;">-<span id="LC2775" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">bound</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">extendNameEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rec_nts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc_nam</span>e</span> <span class="mi" style="color: #099;">1</span><span class="p">))</span></span>
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2781
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<pre style="margin: 0;">+<span id="LC2781" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">bound</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">addToUFM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rec_nts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tc_unique</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">$!</span></span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)))</span></span>
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2782
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<pre style="margin: 0;">+<span id="LC2782" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RC</span> <span class="n" style="color: #333;">bound</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">addToUFM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rec_nts</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc_uniqu</span>e</span> <span class="mi" style="color: #099;">1</span><span class="p">))</span></span>
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2776
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2783
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<pre style="margin: 0;"> <span id="LC2783" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2777
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<pre style="margin: 0;">-<span id="LC2777" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_<span class="idiff left">name</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">tyConNam</span>e</span> <span class="n" style="color: #333;">tc</span></span>
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2784
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<pre style="margin: 0;">+<span id="LC2784" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_<span class="idiff left">unique</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">tyConUniqu</span>e</span> <span class="n" style="color: #333;">tc</span></span>
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2785
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<pre style="margin: 0;"> <span id="LC2785" class="line" lang="haskell"></span>
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2779
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2786
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<pre style="margin: 0;"> <span id="LC2786" class="line" lang="haskell"><span class="cd">-- | Returns whether or not this 'TyCon' is definite, or a hole</span></span>
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2780
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2787
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<pre style="margin: 0;"> <span id="LC2787" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that may be filled in at some later point. See Note [Skolem abstract data]</span></span>
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