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<h3>
Sebastian Graf pushed to branch wip/T18249
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6bc215f58bb94dbe8f5dd48e6fdba8cb4b21475">f6bc215f</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-09-16T16:03:29+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Important micro-optimisation
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<h4>1 changed file:</h4>
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<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
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<h4>Changes:</h4>
<li id="8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6bc215f58bb94dbe8f5dd48e6fdba8cb4b21475#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564"><strong>compiler/GHC/HsToCore/PmCheck/Oracle.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">@@ -1078,20 +1078,20 @@ inhabitationTest fuel old_ty_st nabla@MkNabla{ nabla_tm_st = ts } = do</td>
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1078
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<pre style="margin: 0;"> <span id="LC1078" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tyStateChanged:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tyStateChanged</span> <span class="n" style="color: #333;">old_ty_st</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_ty_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">))</span></span>
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1079
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1079
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<pre style="margin: 0;"> <span id="LC1079" class="line" lang="haskell"> <span class="p">]</span></span>
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1080
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<pre style="margin: 0;"> <span id="LC1080" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- When type state didn't change, we only need to traverse dirty VarInfos</span></span>
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1081
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<pre style="margin: 0;">-<span id="LC1081" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">trv_dirty</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tyStateChanged</span> <span class="n" style="color: #333;">old_ty_st</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_ty_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">traverseAll</span></span>
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1082
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<pre style="margin: 0;">-<span id="LC1082" 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="n" style="color: #333;">traverseDirty</span></span>
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1083
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<pre style="margin: 0;">-<span id="LC1083" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We have to start the inhabitation test with a Nabla where all dirty bits</span></span>
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1084
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<pre style="margin: 0;">-<span id="LC1084" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- are cleared</span></span>
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1085
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<pre style="margin: 0;">-<span id="LC1085" class="line" lang="haskell"> <span class="n" style="color: #333;">ts'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">trv_dirty</span> <span class="p">(</span><span class="n" style="color: #333;">test_one</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="n" style="color: #333;">ts</span></span>
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<pre style="margin: 0;">+<span id="LC1081" class="line" lang="haskell"> <span class="n" style="color: #333;">ts'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">tyStateChanged</span> <span class="n" style="color: #333;">old_ty_st</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_ty_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">traverseAll</span> <span class="n" style="color: #333;">test_one</span> <span class="n" style="color: #333;">ts</span></span>
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<pre style="margin: 0;">+<span id="LC1083" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">traverseDirty</span> <span class="n" style="color: #333;">test_one</span> <span class="n" style="color: #333;">ts</span></span>
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<pre style="margin: 0;"> <span id="LC1084" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts'</span><span class="p">{</span><span class="n" style="color: #333;">ts_dirty</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">emptyDVarSet</span><span class="p">}}</span></span>
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<pre style="margin: 0;"> <span id="LC1085" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1088" class="line" lang="haskell"> <span class="n" style="color: #333;">test_one</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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<pre style="margin: 0;">-<span id="LC1089" class="line" lang="haskell"> <span class="n" style="color: #333;">test_one</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">vi</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="LC1086" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla_not_dirty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span><span class="n" style="color: #333;">ts_dirty</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">emptyDVarSet</span><span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1087" class="line" lang="haskell"> <span class="n" style="color: #333;">test_one</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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<pre style="margin: 0;">+<span id="LC1088" class="line" lang="haskell"> <span class="n" style="color: #333;">test_one</span> <span class="n" style="color: #333;">vi</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="LC1089" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">varNeedsTesting</span> <span class="n" style="color: #333;">old_ty_st</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">case</span></span>
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<pre style="margin: 0;"> <span id="LC1090" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1092
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<pre style="margin: 0;"> <span id="LC1091" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No solution yet and needs testing</span></span>
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1092
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<pre style="margin: 0;"> <span id="LC1092" class="line" lang="haskell"> <span class="n" style="color: #333;">_trcM</span> <span class="s" style="color: #d14;">"instantiate one"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span></span>
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1094
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<pre style="margin: 0;">-<span id="LC1094" class="line" lang="haskell"> <span class="n" style="color: #333;">instantiate</span> <span class="p">(</span><span class="n" style="color: #333;">fuel</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span><span class="n" style="color: #333;">ts_dirty</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">emptyDVarSet</span><span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">vi</span></span>
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<pre style="margin: 0;">+<span id="LC1093" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We have to test with a Nabla where all dirty bits are cleared</span></span>
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<pre style="margin: 0;">+<span id="LC1094" class="line" lang="haskell"> <span class="n" style="color: #333;">instantiate</span> <span class="p">(</span><span class="n" style="color: #333;">fuel</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">nabla_not_dirty</span> <span class="n" style="color: #333;">vi</span></span>
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<pre style="margin: 0;"> <span id="LC1095" 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;">pure</span> <span class="n" style="color: #333;">vi</span></span>
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<pre style="margin: 0;"> <span id="LC1096" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1097" class="line" lang="haskell"><span class="cd">-- | Checks whether the given 'VarInfo' needs to be tested for inhabitants.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1102" 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">@@ -1102,8 +1102,6 @@ inhabitationTest fuel old_ty_st nabla@MkNabla{ nabla_tm_st = ts } = do</td>
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<pre style="margin: 0;"> <span id="LC1102" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 3. Otherwise, if the type state didn't change, we don't need to test.</span></span>
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<pre style="margin: 0;"> <span id="LC1103" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 4. If the type state changed, we compare representation types. No need</span></span>
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<pre style="margin: 0;"> <span id="LC1104" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to test if unchanged.</span></span>
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<pre style="margin: 0;">-<span id="LC1105" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 5. If all the constructors of a TyCon are vanilla, we don't have to test.</span></span>
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<pre style="margin: 0;">-<span id="LC1106" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- "vanilla" = No strict fields and no Theta.</span></span>
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<pre style="margin: 0;"> <span id="LC1105" class="line" lang="haskell"><span class="n" style="color: #333;">varNeedsTesting</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC1106" class="line" lang="haskell"><span class="n" style="color: #333;">varNeedsTesting</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">vi</span></span>
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<pre style="margin: 0;"> <span id="LC1107" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">notNull</span> <span class="p">(</span><span class="n" style="color: #333;">vi_pos</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">False</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">@@ -1117,17 +1115,7 @@ varNeedsTesting old_ty_st MkNabla{nabla_ty_st=new_ty_st} vi = do</td>
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<pre style="margin: 0;"> <span id="LC1115" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">new_rep_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tntrGuts</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">pmTopNormaliseType</span> <span class="n" style="color: #333;">new_ty_st</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vi_id</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span></span>
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1118
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1116
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<pre style="margin: 0;"> <span id="LC1116" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">old_rep_ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">new_rep_ty</span></span>
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1119
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1117
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<pre style="margin: 0;"> <span id="LC1117" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1120
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<pre style="margin: 0;">-<span id="LC1120" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">new_rep_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1121
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<pre style="margin: 0;">-<span id="LC1121" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">_args</span><span class="p">)</span></span>
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1122
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<pre style="margin: 0;">-<span id="LC1122" 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="n" style="color: #333;">dcs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyConDataCons_maybe</span> <span class="n" style="color: #333;">tc</span></span>
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1123
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<pre style="margin: 0;">-<span id="LC1123" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">atLength</span> <span class="p">(</span><span class="n" style="color: #333;">any</span> <span class="n" style="color: #333;">non_vanilla_dc</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">dcs</span> <span class="mi" style="color: #099;">10</span><span class="p">)</span></span>
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1124
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<pre style="margin: 0;">-<span id="LC1124" 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;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1125
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<pre style="margin: 0;">-<span id="LC1125" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1126
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<pre style="margin: 0;">-<span id="LC1126" class="line" lang="haskell"> <span class="n" style="color: #333;">non_vanilla_dc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1127
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<pre style="margin: 0;">-<span id="LC1127" class="line" lang="haskell"> <span class="n" style="color: #333;">non_vanilla_dc</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span></span>
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1128
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<pre style="margin: 0;">-<span id="LC1128" class="line" lang="haskell"> <span class="n" style="color: #333;">notNull</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTheta</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="c1" style="color: #998; font-style: italic;">-- (1)</span></span>
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1129
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<pre style="margin: 0;">-<span id="LC1129" class="line" lang="haskell"> <span class="n" style="color: #333;">notNull</span> <span class="p">(</span><span class="n" style="color: #333;">dataConImplBangs</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- (2)</span></span>
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1130
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<pre style="margin: 0;">-<span id="LC1130" class="line" lang="haskell"></span>
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1118
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<pre style="margin: 0;">+<span id="LC1118" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1131
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1119
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<pre style="margin: 0;"> <span id="LC1119" class="line" lang="haskell"></span>
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1132
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1120
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<pre style="margin: 0;"> <span id="LC1120" class="line" lang="haskell"><span class="cd">-- | Returns (Just vi) if at least one member of each ConLike in the COMPLETE</span></span>
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1133
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1121
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<pre style="margin: 0;"> <span id="LC1121" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- set satisfies the oracle</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">@@ -1209,6 +1197,12 @@ instCompleteSet fuel nabla x cs</td>
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1209
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1197
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<pre style="margin: 0;"> <span id="LC1197" class="line" lang="haskell"></span>
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1210
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1198
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<pre style="margin: 0;"> <span id="LC1198" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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1211
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1199
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<pre style="margin: 0;"> <span id="LC1199" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mzero</span></span>
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1200
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<pre style="margin: 0;">+<span id="LC1200" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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1201
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<pre style="margin: 0;">+<span id="LC1201" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- micro-optimisation, shaves down -7% allocations for PmSeriesG</span></span>
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1202
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<pre style="margin: 0;">+<span id="LC1202" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Recall that dc can't be in vi_neg, because then it would be</span></span>
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<pre style="margin: 0;">+<span id="LC1203" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- deleted from the residual COMPLETE set.</span></span>
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1204
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<pre style="margin: 0;">+<span id="LC1204" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDataConTriviallyInhabited</span> <span class="n" style="color: #333;">dc</span></span>
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1205
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<pre style="margin: 0;">+<span id="LC1205" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span></span>
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1212
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<pre style="margin: 0;"> <span id="LC1206" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="n" style="color: #333;">con</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">cons</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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1213
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<pre style="margin: 0;"> <span id="LC1207" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vi_id</span> <span class="n" style="color: #333;">vi</span></span>
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<pre style="margin: 0;"> <span id="LC1208" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">recur_not_con</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</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">@@ -1219,7 +1213,12 @@ instCompleteSet fuel nabla x cs</td>
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<pre style="margin: 0;"> <span id="LC1213" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">recur_not_con</span> <span class="c1" style="color: #998; font-style: italic;">-- Assume that x can't be con. Encode that fact</span></span>
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<pre style="margin: 0;"> <span id="LC1214" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with addNotConCt and recur.</span></span>
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<pre style="margin: 0;"> <span id="LC1215" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1222" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1216" class="line" lang="haskell"><span class="cd">-- | Is this 'DataCon' trivially inhabited, that is, without needing to perform</span></span>
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<pre style="margin: 0;">+<span id="LC1217" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- any inhabitation testing because of strict fields or type equalities?</span></span>
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<pre style="margin: 0;">+<span id="LC1218" class="line" lang="haskell"><span class="n" style="color: #333;">isDataConTriviallyInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC1219" class="line" lang="haskell"><span class="n" style="color: #333;">isDataConTriviallyInhabited</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC1220" class="line" lang="haskell"> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTheta</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="c1" style="color: #998; font-style: italic;">-- (1)</span></span>
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<pre style="margin: 0;">+<span id="LC1221" class="line" lang="haskell"> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">dataConImplBangs</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- (2)</span></span>
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<pre style="margin: 0;"> <span id="LC1222" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1223" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC1224" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Term oracle unification procedure</span></span>
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